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plexins and transcription components. The ligand for c MET was identified by two independent reports as each a motility factor plus a scatter factor for hepatocytes, and this factor was later found to be exactly the same molecule:
The mature type of HGF consists of an a and b chain, that are held with each other by a disulphide bond. Physiologically, c MET is responsible for your cell scattering phenotype, as very first demonstrated with MDCK cells handled with HGF.
In the course of embryogenesis, this motility func tion of c MET is important for your extended range migration of skeletal muscle progenitor cells. At the same time, altered pla cental development in Hgf and MET knockout mice is responsible for your death of these animals in utero. HGF/c MET signaling The complex phenotype that benefits from c MET signaling involves numerous molecular occasions, which have been described in detail in past testimonials.
HGF binding to c MET benefits in receptor homodimerization and phosphorylation of two tyrosine residues situated within the catalytic loop with the tyrosine kinase HSP domain. Subsequently, tyrosines 1349 and 1356 while in the carboxy terminal tail turn out to be phosphory lated. phospholipase Cg and v src sar coma viral oncogene homolog Src homol ogy domain containing 5 inositol phosphatase as well as the transcription factor signal transducer and activator of transcrip tion Additionally, unique to c MET is its association with the adaptor protein GRB2 related binding protein 1 a multi adaptor protein that, as soon as bound to and phosphorylated by c MET, creates binding web sites for more downstream adaptors.
Extra tyrosines can also contribute to c MET signaling. When Y1313 is phosphorylated, it binds and activates PI3K, which in all probability promotes cell viability and motility. Additionally, Y1365 regulates cell morphogenesis when phosphorylated.
For activation with the Mitogen activated protein kinase cascades, c MET activation stimulates the activity with the rat sarcoma viral oncogene homolog guanine nucleotide exchanger Son of Sevenless via binding with SHC and GRB2 major to your activation of RAS.
TGF-beta The other main arm of c MET signaling will be the PI3K/Akt signaling axis. The p85 subunit of PI3K can bind either straight to c MET or indi rectly by GAB1, which then signals by AKT/protein kinase B. STAT3 has also been implicated in transformation, though its proposed mecha nism is controversial. The direct binding of STAT3 to c MET benefits in STAT3 phosphory lation, dimerization and its translocation to your nucleus.
TGF-beta Consequently, the role of STAT3 in c MET signaling is in all probability context and tissue dependent. FAK is activated by phosphorylation by SRC family kinases, which have been shown to associ ate straight with c MET. The c METSRCFAK interaction leads to cell migration as well as the promotion of anchorage inde pendent growth. Additionally, SRC activation can positively feed back on c MET activation.
The Y1003 site, located in the juxtamembrane domain, TGF-beta can be a adverse regulatory web site for c MET signaling that acts by recruiting c CBL .
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1 uM. A similar experiment was executed in major macrophages, derived from the mouse bone marrow, which also complemented the results with RAW264. 7 cells. As demonstrated in Fig. 3B, selenocoxib 2 substantially inhibited LPS induced COX 2 expression at .
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1 channels exhibits a distinct U shape in some studies, while a U shape is significantly less apparent or absent in data from other individuals. Our information also showed only a sluggish element of inactivation beneath handle situations.
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There is a crystal clear acceleration of deactivation upon the application of celecoxib. In contrast, an wide open channel PARP block is characterised by slower deactivation kinetics than in management and by a cross more than of tail currents. In principle, the concentration dependent acceleration of deactivation could conceivably obscure any effects on deactivation arising from a putative open channel block at larger concentrations.
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The tendency for less withdrawals with celecoxib than NSAID mirrors what has been identified in medical exercise, however not in clinical trials of valdecoxib, dependent on numerous fewer individuals than in this evaluation.
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7 trials have been oligopeptide synthesis developed to verify the presence of endoscopically detectable ulcers of 3 mm or far more, in these, celecoxib was compared with placebo and/or NSAID. Six documented at 12 months, and 1 at 24 weeks. 5 trials also claimed results in accordance to the use of reduced dose aspirin of 325 mg or much less day-to-day.
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Selumetinib also inhibits PARP the growth of human leukemia cells, but does not influence the growth of standard human cells. Selumetinib also suppressed the growth of pancreatic BxPC3 cells, which do not have a identified mutation in this pathway, suggesting that this drug may also be useful for treating cancers that absence definable mutations.
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This possibly because of to complicated opinions loops between the Ras/Raf/MEK/ ERK and PI3K/PTEN/Akt/mTOR pathways whereby either mTORC1 inhibition leads to ERK1/2 activation by a p70S6K/PI3K/Ras dependent pathway or by the KRAS mutants activating p90Rsk 1 which serves to activate eIF4B and rpS6 therefore bypassing mTOR dependent activation.
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They identified that particular mutations in PIK3CA would confer resistance to the PI3K inhibitors, stopping development, in transfected yeast at drug concentrations which would enable typical membrane localized PIK3CA transfected yeast to increase.
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Since rapamycin can only partially inhibit the phosphorylation of 4EBP1, but it can completely in inhibit the phosphorylation of S6K, rapamycin seems to be a substrateselective inhibitor of mTORC1.
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The capability of this compound to stop activation of Akt as measured by phosphorylation at serine 473 was confirmed by immunoblotting. This outcome demonstrates that activation of Akt is essential to sustain latent HSV 1 in sympathetic neuron cultures.
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In vitro immunoprecipitation kinase assays exposed that all about three isoforms of asAkt retained roughly 30% of the activity of the corresponding wtAkt isoforms. Collectively, these data advise that inhibitors PrINZ and 3 IB PP1 are sufficiently selective in opposition to wtAkt and likely off target consequences of these compounds, if any, do not have observable effects on the upstream and downstream signaling of Akt.
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PTHrP isoforms have differing effect on chondrogenic differentiation and hypertrophy of mesenchymal stem cells.
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Biochem Biophys Res Commun. 2012 May 18;421(4):819-24
Authors: Lee JM, Im GI
Abstract
While several isoforms of parathyroid hormone-related peptide (PTHrP) have been commercially available, the difference in their effect has not been widely studied. The purpose of this study was to determine which isoform most effectively promoted chondrogenesis and suppressed hypertrophy from mesenchymal stem cells (MSCs). MSCs isolated from fresh bone marrow were cultured in pellet in chondrogenic medium containing 5 ng/ml of transforming growth factor (TGF)-?(3). From day 14 of culture, subsets of pellets were additionally treated with one of the four PTHrP isoforms (1-34, 1-86, 7-34, and 107-139) at 100 nM. After a further 2 weeks of in vitro culture, pellets were harvested for analysis. PTHrPs 1-34 and 1-86 significantly decreased the DNA level (p<0.05) while PTHrPs 7-34 and 107-139 significantly increased DNA level (p<0.05) compared with the control treated with TGF-?(3) only. Glycosaminoglycan per DNA significantly increased when treated with PTHrPs 1-34 and 1-86 (p<0.05) while it significantly decreased with PTHrPs 7-34 and 107-139 (p<0.05). PTHrP 1-34 significantly increased the gene and protein expression of the chondrogenic marker COL2A1, and decreased those of hypertrophic markers COL10A1 and alkaline phosphatase while other isoforms showed inconsistent effects. All of PTHrP isoforms significantly suppressed the gene and protein expression of indian hedgehog (p<0.05) while all isoforms except PTHrP 107-139 significantly reduced the gene and protein expression of patched 1 (p<0.05). In conclusion, of several PTHrP isoforms, PTHrP 1-34 most significantly enhanced chondrogenesis and suppressed hypertrophy in MSCs, supporting its use for cartilage tissue engineering.
PMID: 22554518 [PubMed - indexed for MEDLINE]
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Determination of morphine, codeine, and paclitaxel in human serum and plasma by micellar electrokinetic chromatography.
J Sep Sci. 2012 Aug 7;
Authors: Rodr�guez J, Contento AM, Casta�eda G, Mu�oz L, Berciano MA
Abstract
A micellar electrokinetic chromatography method is proposed for the determination of morphine, codeine, and paclitaxel at clinical relevant levels in human serum and plasma, which are employed in the treatment of patients with cancer. Optimal conditions for the separation were investigated. A background electrolyte solutions consisting of 20 mM borate buffer adjusted to pH 8.5, sodium dodecyl sulphate 60 mM and 15% methanol, hydrodynamic injection, and 25 kV as separation voltage were used. Detection wavelength was 212 nm for morphine and codeine and 200 nm for paclitaxel. Aspects such as stability of the solutions, linearity, accuracy, precision, and robust and ruggedness were examined in order to validate the proposed method. Detection limits obtained for all the studied compounds ranged between 26 and 52 ng/mL. Before micellar electrokinetic chromatography determination, the samples were purified and enriched by means of an extraction-preconcentration step with a preconditioned C(18) cartridge. This method was applied to the analysis of serum and plasma samples from different cancer patients undergoing treatment with paclitaxel or/and codeine.
PMID: 22887651 [PubMed - as supplied by publisher]
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Tuesday, August 14, 2012
Confirmation of the existence of two distinct genetic groups of infectious bursal disease virus in Australia.
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Confirmation of the existence of two distinct genetic groups of infectious bursal disease virus in Australia.
Aust Vet J. 2002 Nov;80(11):689-94
Authors: Ignjatovic J, Sapats S
Abstract
OBJECTIVE: To characterise infectious bursal disease viruses (IBDVs) prevalent at major commercial sites throughout Australia and to compare the nucleic acid sequences of local strains of IBDV with those of characterised overseas strains.
DESIGN: Samples of bursae were collected from 20 broiler farms that belonged to different poultry companies in New South Wales (NSW), Queensland (Qld), Victoria (Vic), Westem (WA) and South Australia (SA).
METHOD: Bursae were collected from broilers between 24 and 35 days of age. Bursal tissue was homogenised and tested for the presence of IBDV antigen using four monoclonal antibodies (Mabs) which detect antigenic variation in IBDV strains. The nucleotide sequences of the hypervariable region (HVR) within the VP2 gene of IBDVs was determined and the deduced amino acid sequences compared with three vaccine strains and six previously characterised Australian IBDV strains. The deduced amino acid sequences were also compared with the published amino acid sequences of overseas strains. The phylogenetic relationships between Australian strains and overseas strains were then determined.
RESULTS: IBDV was detected in birds from 14 out of 20 farms sampled. Typing with four Mabs showed that all viruses from Vic (6) and SA (10) were antigenic variants, whereas all viruses from NSW (29), Qld (4) and WA (5) were classical-like strains. Nucleotide sequencing of one sample from each of the 14 farms on which IBDV was detected confirmed results obtained with Mabs. The amino acid sequences of all Australian viruses differed from the amino acid sequences of foreign IBDV strains. Phylogenetic analysis showed that Australian IBDV viruses belonged to two distinct genetic groups. Very virulent (vv) IBDV strains belonged to a third genetic group, and overseas classical and variant strains belonged to a fourth genetic group.
CONCLUSIONS: The results confirmed previous findings that there are two groups of IBDV strains circulating in commercial broilers in Australia. The majority are classical-like strains that are antigenically and genetically similar to vaccine strains 002/73 and V877. These classical strains were prevalent in broilers in three states, NSW, Qld and WA. The second group of strains are antigenic variants that were only found in broilers in two states, Vic and SA. All Australian IBDVs characterised to date are genetically distinct and can be differentiated from all other overseas strains. This enables identification of incursion of any exotic strain into Australian poultry, be it classical, US variant or wIBDV strains.
PMID: 12465828 [PubMed - indexed for MEDLINE]
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[Re-evaluation of interval debulking surgery in advanced epithelial ovarian cancer].
[Re-evaluation of interval debulking surgery in advanced epithelial ovarian cancer].
Zhonghua Fu Chan Ke Za Zhi. 2012 May;47(5):355-60
Authors: Ma Y, Li Y, Cui H, Liang XD, Tang ZJ, Li XP, Zhao Y, Wei LH
Abstract
OBJECTIVE: Previous study showed that interval debulking surgery (IDS) may improve the survival of patients with advanced epithelial ovarian cancer (EOC). The precise significance of IDS needs to be evaluated.
METHODS: Totally 136 consecutive patients with stage IIIc or IV EOC (including primary peritoneal carcinoma and primary fallopian tube carcinoma) who completed primary debulking surgery (PDS) and platinum-based chemotherapy were enrolled from January 2000 to December 2009 in a retrospective cohort study. The study group was divided into three groups: 65 cases underwent optimal PDS (Group A), 41 cases received chemotherapy alone after suboptimal PDS (Group B), and 30 patients underwent IDS after suboptimal PDS (Group C). All patients received six to eight courses of platinum-based combination chemotherapy (paclitaxel plus carboplatin/cisplatin, cyclophosphamide plus epirubicin and cisplatin). Patients' clinical characteristics, perioperative situation and prognosis were compared.
RESULTS: Sixty-five cases (47.8%, 65/136) from 136 patients achieved optimal PDS. For Group C, 77% (23/30) patients obtained optimal debulking surgery after IDS. Intraoperative injury rates were similar between Group B and Group C (P > 0.05). Mild perioperative complications rate was also similar (P > 0.05). Median progression-free survival (PFS) of Group A was 26 months. Median overall survival (OS) of Group B and Group C were 31 months and 40 months, respectively (P = 0.254). Median PFS of Group B and Group C were 13 months and 24 months, respectively (P = 0.289). Although when it came to 20 months after PDS, patients who underwent IDS had a significantly lower progressive disease (PD) rate (Group B 33% versus Group C 61%, P = 0.046), it still showed that there was no significant difference in either OS or PFS of these two groups. Those patients in Group C who obtained no visible residual got similar PFS (27 months) comparing to Group A (26 months, P = 0.730), but OS was still shorter (P = 0.010).
CONCLUSIONS: For advanced EOC patients, IDS has little effect on improving survival. While it is safe and acceptable, also may prolong PFS in those patients who got no visible residual after IDS. The results suggest that IDS might be used as an alternative treatment for advanced EOC patients who cannot obtain optimal PDS in certain local hospitals.
PMID: 22883524 [PubMed - in process]
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Self-assembled micelles of monosialogangliosides as nanodelivery vehicles for taxanes.
Self-assembled micelles of monosialogangliosides as nanodelivery vehicles for taxanes.
J Control Release. 2012 Aug 1;
Authors: Leonhard V, Alasino RV, Bianco ID, Garro AG, Heredia V, Beltramo DM
Abstract
We demonstrate herein that taxanes (paclitaxel (Ptx) and docetaxel (Dtx)) can be spontaneously loaded into ganglioside nanomicelles. The efficiency of gangliosides to solubilize taxanes was highly dependent on their self-aggregating structure. Thus, GM3 that forms unilamellar vesicles was less efficient to solubilize taxanes than gangliosides that form micelles (i.e. GM1 and GM2). Sialic acid cyclization of GM1 by acid treatment led to an important reduction in its capacity to solubilize taxanes, as also did the replacement of the fatty acid of ceramide by a dicholoracetyl group. Water solubility of paclitaxel (Ptx) is less than 1?gmL(-1) and increased up to 6.3mg.mL(-1) upon its association with GM1 micelles. The incorporation of Ptx in GM1 reached an optimum at GM1/Ptx 20/1 molar ratio when performed at room temperature. An increase in the solubilization capacity of GM1 micelles was observed upon dehydration of their polar head group by pre-treatment at 55�C. Loading of Ptx into the micelle induced a structural reorganization that led to an important protection of Ptx reducing its hydrolysis at alkaline pH. Diffusion of either GM1 or Ptx was restricted upon mixed-micelle formation indicating that they are kinetically more stable than pure ganglioside micelles. X-ray powder diffraction of lyophilized GM1 micelles with Ptx showed a change in their internal structure from a crystalline state to completely amorphous. Taxane-ganglioside mixed micelles were stable in solution for at least 4months and also upon freeze-thawing or lyophilization-solubilization cycles. Upon mixing with human blood constituents, GM1/Ptx micelles did not induce hemolysis or platelet aggregation and were spontaneously covered with human serum albumin (HSA), which could aid in the delivery of micellar content to tumors. In vitro antimitotic activity of GM1/Ptx mixed micelles was qualitatively equivalent to that of free drug in DMSO solution.
PMID: 22877735 [PubMed - as supplied by publisher]
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Comparison of metformin and insulin versus insulin alone for type 2 diabetes: systematic review of randomised clinical trials with meta-analyses and trial sequential analyses.
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Comparison of metformin and insulin versus insulin alone for type 2 diabetes: systematic review of randomised clinical trials with meta-analyses and trial sequential analyses.
BMJ. 2012;344:e1771
Authors: Hemmingsen B, Christensen LL, Wetterslev J, Vaag A, Gluud C, Lund SS, Almdal T
Abstract
OBJECTIVES: To compare the benefits and harms of metformin and insulin versus insulin alone as reported in randomised clinical trials of patients with type 2 diabetes.
DESIGN: Systematic review of randomised clinical trials with meta-analyses and trial sequential analyses.
DATA SOURCES: The Cochrane Library, Medline, Embase, Science Citation Index Expanded, Latin American Caribbean Health Sciences Literature, and Cumulative Index to Nursing and Allied Health Literature until March 2011. We also searched abstracts presented at the American Diabetes Association and European Association for the Study of Diabetes Congresses, contacted relevant trial authors and pharmaceutical companies, hand searched reference lists of included trials, and searched the US Food and Drug Administration website.
REVIEW METHODS: Two authors independently screened titles and abstracts for randomised clinical trials comparing metformin and insulin versus insulin alone (with or without placebo) in patients with type 2 diabetes, older than 18 years, and with an intervention period of at least 12 weeks. We included trials irrespective of language, publication status, predefined outcomes, antidiabetic interventions used before randomisation, and reported outcomes.
RESULTS: We included 26 randomised trials with 2286 participants, of which 23 trials with 2117 participants could provide data. All trials had high risk of bias. Data were sparse for outcomes relevant to patients. Metformin and insulin versus insulin alone did not significantly affect all cause mortality (relative risk 1.30, 95% confidence interval 0.57 to 2.99) or cardiovascular mortality (1.70, 0.35 to 8.30). Trial sequential analyses showed that more trials were needed before reliable conclusions could be drawn regarding these outcomes. In a fixed effect model, but not in a random effects model, severe hypoglycaemia was significantly more frequent with metformin and insulin than with insulin alone (2.83, 1.17 to 6.86). In a random effects model, metformin and insulin resulted in reduced HbA(1c), weight gain, and insulin dose, compared with insulin alone; trial sequential analyses showed sufficient evidence for a HbA(1c) reduction of 0.5%, lower weight gain of 1 kg, and lower insulin dose of 5 U/day.
CONCLUSIONS: There was no evidence or even a trend towards improved all cause mortality or cardiovascular mortality with metformin and insulin, compared with insulin alone in type 2 diabetes. Data were limited by the severe lack of data reported by trials for patient relevant outcomes and by poor bias control.
PMID: 22517929 [PubMed - indexed for MEDLINE]
The treatment of West syndrome: a Cochrane review of the literature to December 2000.
Related Articles |
The treatment of West syndrome: a Cochrane review of the literature to December 2000.
Brain Dev. 2001 Nov;23(7):624-34
Authors: Hancock E, Osborne JP, Milner P
Abstract
BACKGROUND: West syndrome is an age dependent syndrome, which includes a peculiar type of epileptic seizure (infantile spasms), usually hypsarrhythmia and in the majority psychomotor retardation. Despite huge advances in medicine it still remains a poorly understood entity and although with newer imaging techniques we are more often able to elicit the underlying 'causes' of these spasms, still little is known about their pathophysiological basis and treatment remains problematic.
OBJECTIVES: To compare the effects of single pharmaceutical therapies used to treat infantile spasms in terms of long-term psychomotor development, subsequent epilepsy, control of the spasms and side effects.
METHODS: A search of the central trials register of the Cochrane Epilepsy Group, medline database, embase database and the reference lists of all retrieved articles was undertaken. Correspondence with colleagues and drug companies and appeals at international conferences were also undertaken to try and discover unpublished data. All randomised controlled trials (RCTs) on the medical treatment of infantile spasms were included. Data was then extracted independently by the three reviewers and analysed using the RevMan software package.
MAIN RESULTS: We found ten small RCTs on the pharmacological treatment of infantile spasms. No unpublished trials were discovered. These ten studies looked at just 335 patients treated with a total of eight different pharmaceutical agents. Overall methodology of the studies was poor, partly because of ethical dilemmas such as giving placebo injections to children. No study considered the effects of treatment on long-term psychomotor development or onset of other seizure types. One small study found vigabatrin to be more efficacious in stopping infantile spasms in a group of patients with tuberous sclerosis than hydrocortisone. One underpowered study showed a trend for vigabatrin to be more efficacious than placebo in stopping infantile spasms, another two equally underpowered studies suggested adrenocorticotrophic hormone (ACTH) to be more efficacious than low-dose prednisone. It was not possible to compare reduction in the number of spasms between the different treatments because of differences in methods of analysis. Overall, only nine patients were reported to have been withdrawn from the trial treatments due to side effects and two deaths were reported.
CONCLUSIONS: There is still little evidence available on the optimum treatment for infantile spasms. Further trials with larger number of patients, and longer follow-up are required.
PMID: 11701267 [PubMed - indexed for MEDLINE]
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Monday, August 13, 2012
Neutral Loss Fragmentation Pattern Based Screening for Arginine-Rich Natural Products in Xenorhabdus and Photorhabdus.
Neutral Loss Fragmentation Pattern Based Screening for Arginine-Rich Natural Products in Xenorhabdus and Photorhabdus.
Anal Chem. 2012 Aug 6;
Authors: Fuchs SW, Sachs CC, Kegler C, Nollmann FI, Karas M, Bode HB
Abstract
Although sharing a certain degree of structural uniformity, natural product classes exhibit variable functionalities such as different amino acid or acyl residues. During collision induced dissociation, some natural products exhibit a conserved fragmentation pattern close to the precursor ion. The observed fragments result from a shared set of neutral losses, creating a unique fragmentation pattern, which can be used as a fingerprint for members of these natural product classes. The culture supernatants of 69 strains of the entomopathogenic bacteria Photorhabdus and Xenorhabdus were analyzed by MALDI-MS(2), and a database comprising MS(2) data from each strain was established. This database was scanned for concordant fragmentation patterns of different compounds using a customized software, focusing on relative mass differences of the fragment ions to their precursor ion. A novel group of related natural products comprising 25 different arginine-rich peptides from 16 different strains was identified due to its characteristic neutral loss fragmentation pattern, and the structures of eight compounds were elucidated. Two biosynthesis gene clusters encoding nonribosomal peptide synthetases were identified, emphasizing the possibility to identify a group of structurally and biosynthetically related natural products based on their neutral loss fragmentation pattern.
PMID: 22873683 [PubMed - as supplied by publisher]
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Fluticasone propionate compared with budesonide: a double-blind trial in asthmatic children using powder devices at a dosage of 400 microg x day(-1).
Related Articles |
Fluticasone propionate compared with budesonide: a double-blind trial in asthmatic children using powder devices at a dosage of 400 microg x day(-1).
Eur Respir J. 1996 Nov;9(11):2263-72
Authors: Hoekx JC, Hedlin G, Pedersen W, Sorva R, Hollingworth K, Efthimiou J
Abstract
The aim of this study was to compare fluticasone propionate (FP) with budesonide (BUD) at a dose of 400 microg x day(-1) in the treatment of children with asthma. Two hundred and twenty nine children with mild-to-moderate asthma, currently receiving 200-400 microg x day(-1) of inhaled corticosteroid, were randomized to receive either 400 microg x day(-1) of FP from the Diskhaler (registered trade mark of the Glaxo Group of Companies) or 400 microg x day(-1) of BUD from the Turbuhaler (registered trade mark of Astra Pharmaceuticals Ltd) for 8 weeks, in a parallel-group, double-blind, double-dummy study. Primary efficacy was assessed by measurement of daily peak expiratory flow (PEF). In addition, pulmonary function tests were performed at each clinic visit and a self-administered patient-centred questionnaire was completed by one parent of each patient at the start and end of study treatment. Mean morning PEF increased following treatment both with FP and BUD, but was significantly higher following treatment with FP during Weeks 1-4 (p=0.015) and Weeks 1-8 (p=0.019). Similar results were found for mean evening PEF and percentage predicted morning and evening PEF. Children receiving FP experienced significantly less disruption in their physical activities (i.e. sports, games) because of their asthma compared to children treated with BUD (p=0.03). Mean cortisol levels increased in both groups, but the increase was significantly higher in the FP group at 4 weeks (p=0.022). Serum and urine markers of bone formation and resorption changed very little and showed no consistent pattern of change. Fluticasone propionate at a dosage of 400 microg x day(-1) from the Diskhaler provided a more rapid and greater improvement in lung function in children with mild-to-moderate asthma than BUD 400 microg day(-1) from the Turbuhaler. Both treatments were well-tolerated, with a similar safety profile.
PMID: 8947070 [PubMed - indexed for MEDLINE]
Free-riding and the prisoner's dilemma: problems in funding economic analyses of phase III cancer clinical trials.
Related Articles |
Free-riding and the prisoner's dilemma: problems in funding economic analyses of phase III cancer clinical trials.
J Clin Oncol. 1995 Sep;13(9):2457-63
Authors: Bennett CL, Smith TJ, George SL, Hillner BE, Fleishman S, Niell HB
Abstract
PURPOSE: Both economic and clinical data on new agents are important to policy-makers who approve pharmaceuticals for widespread use. Randomized clinical trials have been used to evaluate both clinical results and total medical costs associated with new agents. With new expensive pharmaceutical agents, early assessments of economic benefit have taken on greater importance to physicians and patients. Who should provide financial support to these integrated economic and clinical analyses in clinical trials? Here we describe issues that hinder funding of economic analyses and propose potential support mechanisms.
RESULTS: The Cancer and Leukemia Group B (CALGB), a large, national cooperative group of academic and community hospitals in the United States, designed a non-small-cell lung cancer (NSCLC) treatment trial to compare two widely used supportive care regimens that varied 20-fold in cost. One important objective of this trial was to compare the cost-effectiveness of the two regimens. While funding for the clinical trial was supported by grants from the National Cancer Institute and the pharmaceutical companies involved in the trial, no specific funding agency was willing and/or able to provide financial support for the economic analyses. After 2 years of planning, the clinical trial was retracted when the funding for the economic analyses could not be secured. The prisoner's dilemma, individual reluctance to support a common social good, explains the lack of funding.
CONCLUSION: Economic theory predicts difficulties in evaluating cost-effectiveness of new pharmaceuticals and reluctance to support economic analyses of clinical trials. Economic analyses will require new sources of funds that will not take scarce resources from clinical trials groups. Options for funding include a new federal agency, coordinated work by existing agencies, or academic centers for economic analysis.
PMID: 7545222 [PubMed - indexed for MEDLINE]
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Free-riding and the prisoner's dilemma: problems in funding economic analyses of phase III cancer clinical trials.
Related Articles |
Free-riding and the prisoner's dilemma: problems in funding economic analyses of phase III cancer clinical trials.
J Clin Oncol. 1995 Sep;13(9):2457-63
Authors: Bennett CL, Smith TJ, George SL, Hillner BE, Fleishman S, Niell HB
Abstract
PURPOSE: Both economic and clinical data on new agents are important to policy-makers who approve pharmaceuticals for widespread use. Randomized clinical trials have been used to evaluate both clinical results and total medical costs associated with new agents. With new expensive pharmaceutical agents, early assessments of economic benefit have taken on greater importance to physicians and patients. Who should provide financial support to these integrated economic and clinical analyses in clinical trials? Here we describe issues that hinder funding of economic analyses and propose potential support mechanisms.
RESULTS: The Cancer and Leukemia Group B (CALGB), a large, national cooperative group of academic and community hospitals in the United States, designed a non-small-cell lung cancer (NSCLC) treatment trial to compare two widely used supportive care regimens that varied 20-fold in cost. One important objective of this trial was to compare the cost-effectiveness of the two regimens. While funding for the clinical trial was supported by grants from the National Cancer Institute and the pharmaceutical companies involved in the trial, no specific funding agency was willing and/or able to provide financial support for the economic analyses. After 2 years of planning, the clinical trial was retracted when the funding for the economic analyses could not be secured. The prisoner's dilemma, individual reluctance to support a common social good, explains the lack of funding.
CONCLUSION: Economic theory predicts difficulties in evaluating cost-effectiveness of new pharmaceuticals and reluctance to support economic analyses of clinical trials. Economic analyses will require new sources of funds that will not take scarce resources from clinical trials groups. Options for funding include a new federal agency, coordinated work by existing agencies, or academic centers for economic analysis.
PMID: 7545222 [PubMed - indexed for MEDLINE]
Sunday, August 12, 2012
Comparison of the efficacy and safety of Consupren solution and Sandimmun Neoral solution, 50 ml in stable heart transplant patients.
Related Articles |
Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub. 2002 Dec;146(2):87-90
Authors: Toman J, Spinarov� L, Krejc� J, Hude P, Kopecn� E, Kamar�d V
Abstract
Cyclosporine A (CyA) is a standard component of immunosuppressive regimen after heart transplantation in most centres. The widespread clinical use of cyclosporine-based immunosuppressive regimens since 1983 has led to significant improvements in the survival of cardiac allograft recipients due to decreased mortality from infections and rejections. (1-3) CyA has been shown to be safe and effective. Owing to its success when used after the heart transplantation the number of patients has also risen. This caused growing financial demands on health insurance companies in the Czech Republic where the immunosuppressive drugs are fully reimbursed. A prospective randomized study in 11 stable heart transplant patients was performed to compare the efficacy and safety of Consupren (IVAX-CR) a Sandimmun Neoral (Novartis) solution based immunosuppressive regimen. The results suggest that Consupren solution can be used as an alternative treatment to Sandimmun Neoral in CyA based regimen.
PMID: 12572904 [PubMed - indexed for MEDLINE]
potassium channel genes potassium channel Paclitaxel
S-Nitrosylation of EGFR and Src activates an oncogenic signaling network in human basal-like breast cancer.
S-Nitrosylation of EGFR and Src activates an oncogenic signaling network in human basal-like breast cancer.
Mol Cancer Res. 2012 Aug 9;
Authors: Switzer CH, Glynn SA, Cheng RY, Ridnour LA, Green JE, Ambs S, Wink DA
Abstract
Increased inducible nitric oxide synthase (NOS2) expression in breast tumors is associated with decreased survival of estrogen receptor-negative (ER-) breast cancer patients. We recently communicated the preliminary observation that nitric oxide (NO) signaling results in EGFR tyrosine phosphorylation. To further define the role of NO in the pathogenesis of ER- breast cancer, we examined the mechanism of NO-induced EGFR activation in human ER- breast cancer. NO was found to activate EGFR and Src by a mechanism that includes S-nitrosylation. NO, at physiologically relevant concentrations, induced an EGFR/Src-mediated activation of oncogenic signal transduction pathways (including c-Myc, Akt and ?-catenin) and the loss of PP2A tumor suppressor activity. Additionally, NO signaling increased cellular EMT, expression and activity of COX-2 and chemoresistance to adriamycin and paclitaxel. When connected into a network, these concerted events link NO to the development of a stem cell-like phenotype, resulting in the upregulation of CD44 and STAT3 phosphorylation. Our observations are also consistent with the finding that NOS2 is associated with a basal-like transcription pattern in human breast tumors. These results indicate that the inhibition of NOS2 activity or NO signaling networks may have beneficial effects in treating basal-like breast cancer patients.
PMID: 22878588 [PubMed - as supplied by publisher]
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[Short-acting insulin analogs--critical assessment of meta-analyses].
Related Articles |
[Short-acting insulin analogs--critical assessment of meta-analyses].
Dtsch Med Wochenschr. 2006 Dec;131 Suppl 8:S274-9
Authors: Kunt T
Abstract
Short-acting insulin analogs have for nearly ten years been prescribed for type 1 and 2 diabetes mellitus. There is extensive scientific and practical evidence of their being better than normal insulin. For this reason these insulins have been recommended in the guidelines of most leading specialist societies. In everyday practice they are an important component of the therapeutic portfolio which can produce an improvement in insulin treatment, especially of selective cases. On the other hand, there is growing economic pressure, especially in Germany, affecting their use. However, it must be critically asserted that those meta-analyses on insulin analogs, which have been commissioned by insurance companies or governmental organisations, do not do justice to their advantage. Current meta-analyses of short-acting insulin analogs exclude decisive advantages of insulin analogs from their analyses and compare highly heterogeneous groups. They do not distinguish between differing incidences of hypoglycemia associated with different HbA1c values as well as between conventional and intensive treatment. Furthermore positive data and positive major studies are excluded, while approval studies or trials with completely different aims are cited. Short study duration is also often neglected. As a result, the International Diabetes Federation (IDF) has rejected the Cochrane Review for 2005 for methodological reasons. Also, no recommendations can be derived from the recommendations of of the Institut f�r Qualit�tssicherung und Wirtschaftlichkeit in der Medizin (IQWiG: Institute for Quality Assurance and Cost Effectiveness in Medicine). After critical assessment of meta-analyses the IDF concluded in its guidelines that insulin analogs should generally be used.
PMID: 17139586 [PubMed - indexed for MEDLINE]
S-Nitrosylation of EGFR and Src activates an oncogenic signaling network in human basal-like breast cancer.
S-Nitrosylation of EGFR and Src activates an oncogenic signaling network in human basal-like breast cancer.
Mol Cancer Res. 2012 Aug 9;
Authors: Switzer CH, Glynn SA, Cheng RY, Ridnour LA, Green JE, Ambs S, Wink DA
Abstract
Increased inducible nitric oxide synthase (NOS2) expression in breast tumors is associated with decreased survival of estrogen receptor-negative (ER-) breast cancer patients. We recently communicated the preliminary observation that nitric oxide (NO) signaling results in EGFR tyrosine phosphorylation. To further define the role of NO in the pathogenesis of ER- breast cancer, we examined the mechanism of NO-induced EGFR activation in human ER- breast cancer. NO was found to activate EGFR and Src by a mechanism that includes S-nitrosylation. NO, at physiologically relevant concentrations, induced an EGFR/Src-mediated activation of oncogenic signal transduction pathways (including c-Myc, Akt and ?-catenin) and the loss of PP2A tumor suppressor activity. Additionally, NO signaling increased cellular EMT, expression and activity of COX-2 and chemoresistance to adriamycin and paclitaxel. When connected into a network, these concerted events link NO to the development of a stem cell-like phenotype, resulting in the upregulation of CD44 and STAT3 phosphorylation. Our observations are also consistent with the finding that NOS2 is associated with a basal-like transcription pattern in human breast tumors. These results indicate that the inhibition of NOS2 activity or NO signaling networks may have beneficial effects in treating basal-like breast cancer patients.
PMID: 22878588 [PubMed - as supplied by publisher]
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Saturday, August 11, 2012
Neutral Loss Fragmentation Pattern Based Screening for Arginine-Rich Natural Products in Xenorhabdus and Photorhabdus.
Neutral Loss Fragmentation Pattern Based Screening for Arginine-Rich Natural Products in Xenorhabdus and Photorhabdus.
Anal Chem. 2012 Aug 6;
Authors: Fuchs SW, Sachs CC, Kegler C, Nollmann FI, Karas M, Bode HB
Abstract
Although sharing a certain degree of structural uniformity, natural product classes exhibit variable functionalities such as different amino acid or acyl residues. During collision induced dissociation, some natural products exhibit a conserved fragmentation pattern close to the precursor ion. The observed fragments result from a shared set of neutral losses, creating a unique fragmentation pattern, which can be used as a fingerprint for members of these natural product classes. The culture supernatants of 69 strains of the entomopathogenic bacteria Photorhabdus and Xenorhabdus were analyzed by MALDI-MS(2), and a database comprising MS(2) data from each strain was established. This database was scanned for concordant fragmentation patterns of different compounds using a customized software, focusing on relative mass differences of the fragment ions to their precursor ion. A novel group of related natural products comprising 25 different arginine-rich peptides from 16 different strains was identified due to its characteristic neutral loss fragmentation pattern, and the structures of eight compounds were elucidated. Two biosynthesis gene clusters encoding nonribosomal peptide synthetases were identified, emphasizing the possibility to identify a group of structurally and biosynthetically related natural products based on their neutral loss fragmentation pattern.
PMID: 22873683 [PubMed - as supplied by publisher]
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natural products research; +117 new citations
117 new pubmed citations were retrieved for your search. Click on the search hyperlink below to display the complete search results:
These pubmed results were generated on 2012/08/11
PubMed, a service of the National Library of Medicine, includes over 15 million citations for biomedical articles back to the 1950's. These citations are from MEDLINE and additional life science journals. PubMed includes links to many sites providing full text articles and other related resources.
Patient-specific induced pluripotent stem cells as a model for familial dilated cardiomyopathy.
Related Articles |
Patient-specific induced pluripotent stem cells as a model for familial dilated cardiomyopathy.
Sci Transl Med. 2012 Apr 18;4(130):130ra47
Authors: Sun N, Yazawa M, Liu J, Han L, Sanchez-Freire V, Abilez OJ, Navarrete EG, Hu S, Wang L, Lee A, Pavlovic A, Lin S, Chen R, Hajjar RJ, Snyder MP, Dolmetsch RE, Butte MJ, Ashley EA, Longaker MT, Robbins RC, Wu JC
Abstract
Characterized by ventricular dilatation, systolic dysfunction, and progressive heart failure, dilated cardiomyopathy (DCM) is the most common form of cardiomyopathy in patients. DCM is the most common diagnosis leading to heart transplantation and places a significant burden on healthcare worldwide. The advent of induced pluripotent stem cells (iPSCs) offers an exceptional opportunity for creating disease-specific cellular models, investigating underlying mechanisms, and optimizing therapy. Here, we generated cardiomyocytes from iPSCs derived from patients in a DCM family carrying a point mutation (R173W) in the gene encoding sarcomeric protein cardiac troponin T. Compared to control healthy individuals in the same family cohort, cardiomyocytes derived from iPSCs from DCM patients exhibited altered regulation of calcium ion (Ca(2+)), decreased contractility, and abnormal distribution of sarcomeric ?-actinin. When stimulated with a ?-adrenergic agonist, DCM iPSC-derived cardiomyocytes showed characteristics of cellular stress such as reduced beating rates, compromised contraction, and a greater number of cells with abnormal sarcomeric ?-actinin distribution. Treatment with ?-adrenergic blockers or overexpression of sarcoplasmic reticulum Ca(2+) adenosine triphosphatase (Serca2a) improved the function of iPSC-derived cardiomyocytes from DCM patients. Thus, iPSC-derived cardiomyocytes from DCM patients recapitulate to some extent the morphological and functional phenotypes of DCM and may serve as a useful platform for exploring disease mechanisms and for drug screening.
PMID: 22517884 [PubMed - indexed for MEDLINE]
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Patient-specific induced pluripotent stem cells as a model for familial dilated cardiomyopathy.
Related Articles |
Patient-specific induced pluripotent stem cells as a model for familial dilated cardiomyopathy.
Sci Transl Med. 2012 Apr 18;4(130):130ra47
Authors: Sun N, Yazawa M, Liu J, Han L, Sanchez-Freire V, Abilez OJ, Navarrete EG, Hu S, Wang L, Lee A, Pavlovic A, Lin S, Chen R, Hajjar RJ, Snyder MP, Dolmetsch RE, Butte MJ, Ashley EA, Longaker MT, Robbins RC, Wu JC
Abstract
Characterized by ventricular dilatation, systolic dysfunction, and progressive heart failure, dilated cardiomyopathy (DCM) is the most common form of cardiomyopathy in patients. DCM is the most common diagnosis leading to heart transplantation and places a significant burden on healthcare worldwide. The advent of induced pluripotent stem cells (iPSCs) offers an exceptional opportunity for creating disease-specific cellular models, investigating underlying mechanisms, and optimizing therapy. Here, we generated cardiomyocytes from iPSCs derived from patients in a DCM family carrying a point mutation (R173W) in the gene encoding sarcomeric protein cardiac troponin T. Compared to control healthy individuals in the same family cohort, cardiomyocytes derived from iPSCs from DCM patients exhibited altered regulation of calcium ion (Ca(2+)), decreased contractility, and abnormal distribution of sarcomeric ?-actinin. When stimulated with a ?-adrenergic agonist, DCM iPSC-derived cardiomyocytes showed characteristics of cellular stress such as reduced beating rates, compromised contraction, and a greater number of cells with abnormal sarcomeric ?-actinin distribution. Treatment with ?-adrenergic blockers or overexpression of sarcoplasmic reticulum Ca(2+) adenosine triphosphatase (Serca2a) improved the function of iPSC-derived cardiomyocytes from DCM patients. Thus, iPSC-derived cardiomyocytes from DCM patients recapitulate to some extent the morphological and functional phenotypes of DCM and may serve as a useful platform for exploring disease mechanisms and for drug screening.
PMID: 22517884 [PubMed - indexed for MEDLINE]
Meta-analysis of everolimus-eluting stent as compared to sirolimus-eluting stent in patients undergoing percutaneous coronary interventions: an update.
Related Articles |
Meta-analysis of everolimus-eluting stent as compared to sirolimus-eluting stent in patients undergoing percutaneous coronary interventions: an update.
Int J Cardiol. 2011 Jul 1;150(1):101-3
Authors: Chen H, Liu K
PMID: 21497406 [PubMed - indexed for MEDLINE]
Friday, August 10, 2012
Therapeutic application of injectable thermosensitive hydrogel in preventing local breast cancer recurrence and improving incision wound healing in a mouse model.
Therapeutic application of injectable thermosensitive hydrogel in preventing local breast cancer recurrence and improving incision wound healing in a mouse model.
Nanoscale. 2012 Aug 9;
Authors: Lei N, Gong C, Qian Z, Luo F, Wang C, Wang H, Wei Y
Abstract
Many drug delivery systems (DDSs) have been investigated for local targeting of malignant disease with the intention of increasing anti-tumor activity and minimizing systemic toxicity. An injectable thermosensitive hydrogel was applied to prevent locoregional recurrence of 4T1 breast cancer in a mouse model. The presented hydrogel, which is based on poly(ethyleneglycol)-poly(?-caprolactone)-poly(ethylene glycol) (PEG-PCL-PEG, PECE), flows freely at normal temperature, forms a gel within seconds in situ at body temperature, and eventually releases the drug in a consistent and sustained fashion as it gradually biodegrades. Locoregional recurrence after primary tumor removal was significantly inhibited in mice treated with the paclitaxel (PTX)-loaded PECE hydrogel subcutaneously (9.1%) administered, compared with the blank hydrogel (80.0%), systemic (77.8%) and locally (75.0%) administered PTX, and the control group (100%) (P < 0.01). In addition, tensile strength measurements of the surgical incisions showed that the PECE hydrogel accelerates wound healing at postoperative day 7 (P < 0.05), and days 4 and 14 (P > 0.05), in agreement with histopathological examinations. This novel DDSs represents a promising approach for local adjuvant therapy in malignant disease.
PMID: 22875402 [PubMed - as supplied by publisher]
antigen peptide; +46 new citations
46 new pubmed citations were retrieved for your search. Click on the search hyperlink below to display the complete search results:
These pubmed results were generated on 2012/08/10
PubMed, a service of the National Library of Medicine, includes over 15 million citations for biomedical articles back to the 1950's. These citations are from MEDLINE and additional life science journals. PubMed includes links to many sites providing full text articles and other related resources.
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[Short-acting insulin analogs--critical assessment of meta-analyses].
Related Articles |
[Short-acting insulin analogs--critical assessment of meta-analyses].
Dtsch Med Wochenschr. 2006 Dec;131 Suppl 8:S274-9
Authors: Kunt T
Abstract
Short-acting insulin analogs have for nearly ten years been prescribed for type 1 and 2 diabetes mellitus. There is extensive scientific and practical evidence of their being better than normal insulin. For this reason these insulins have been recommended in the guidelines of most leading specialist societies. In everyday practice they are an important component of the therapeutic portfolio which can produce an improvement in insulin treatment, especially of selective cases. On the other hand, there is growing economic pressure, especially in Germany, affecting their use. However, it must be critically asserted that those meta-analyses on insulin analogs, which have been commissioned by insurance companies or governmental organisations, do not do justice to their advantage. Current meta-analyses of short-acting insulin analogs exclude decisive advantages of insulin analogs from their analyses and compare highly heterogeneous groups. They do not distinguish between differing incidences of hypoglycemia associated with different HbA1c values as well as between conventional and intensive treatment. Furthermore positive data and positive major studies are excluded, while approval studies or trials with completely different aims are cited. Short study duration is also often neglected. As a result, the International Diabetes Federation (IDF) has rejected the Cochrane Review for 2005 for methodological reasons. Also, no recommendations can be derived from the recommendations of of the Institut f�r Qualit�tssicherung und Wirtschaftlichkeit in der Medizin (IQWiG: Institute for Quality Assurance and Cost Effectiveness in Medicine). After critical assessment of meta-analyses the IDF concluded in its guidelines that insulin analogs should generally be used.
PMID: 17139586 [PubMed - indexed for MEDLINE]
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Fluticasone propionate compared with budesonide: a double-blind trial in asthmatic children using powder devices at a dosage of 400 microg x day(-1).
Related Articles |
Fluticasone propionate compared with budesonide: a double-blind trial in asthmatic children using powder devices at a dosage of 400 microg x day(-1).
Eur Respir J. 1996 Nov;9(11):2263-72
Authors: Hoekx JC, Hedlin G, Pedersen W, Sorva R, Hollingworth K, Efthimiou J
Abstract
The aim of this study was to compare fluticasone propionate (FP) with budesonide (BUD) at a dose of 400 microg x day(-1) in the treatment of children with asthma. Two hundred and twenty nine children with mild-to-moderate asthma, currently receiving 200-400 microg x day(-1) of inhaled corticosteroid, were randomized to receive either 400 microg x day(-1) of FP from the Diskhaler (registered trade mark of the Glaxo Group of Companies) or 400 microg x day(-1) of BUD from the Turbuhaler (registered trade mark of Astra Pharmaceuticals Ltd) for 8 weeks, in a parallel-group, double-blind, double-dummy study. Primary efficacy was assessed by measurement of daily peak expiratory flow (PEF). In addition, pulmonary function tests were performed at each clinic visit and a self-administered patient-centred questionnaire was completed by one parent of each patient at the start and end of study treatment. Mean morning PEF increased following treatment both with FP and BUD, but was significantly higher following treatment with FP during Weeks 1-4 (p=0.015) and Weeks 1-8 (p=0.019). Similar results were found for mean evening PEF and percentage predicted morning and evening PEF. Children receiving FP experienced significantly less disruption in their physical activities (i.e. sports, games) because of their asthma compared to children treated with BUD (p=0.03). Mean cortisol levels increased in both groups, but the increase was significantly higher in the FP group at 4 weeks (p=0.022). Serum and urine markers of bone formation and resorption changed very little and showed no consistent pattern of change. Fluticasone propionate at a dosage of 400 microg x day(-1) from the Diskhaler provided a more rapid and greater improvement in lung function in children with mild-to-moderate asthma than BUD 400 microg day(-1) from the Turbuhaler. Both treatments were well-tolerated, with a similar safety profile.
PMID: 8947070 [PubMed - indexed for MEDLINE]
CHD7 mutations causing CHARGE syndrome are predominantly of paternal origin.
Related Articles |
CHD7 mutations causing CHARGE syndrome are predominantly of paternal origin.
Clin Genet. 2012 Mar;81(3):234-9
Authors: Pauli S, von Velsen N, Burfeind P, Steckel M, M�nz J, Buchholz A, Borozdin W, Kohlhase J
Abstract
CHARGE (coloboma, heart defects, atresia of the choanae, retarded growth and development, genital hypoplasia, ear anomalies and deafness) syndrome is a congenital malformation syndrome caused by mutations in the CHD7 gene in approximately 2/3 of cases. In the vast majority of cases, CHARGE syndrome is sporadic. There are only a few reports of parent-to-child transmission and somatic or gonadal mosaicism. To determine the parental origin of CHD7 mutations in sporadic CHARGE syndrome, we screened 30 families for informative exonic or intronic polymorphisms located near the detected CHD7 mutation. An informative polymorphism could be identified in 13 out of 30 families. Linkage analysis was performed between the CHD7 mutation and the polymorphism in the child. In 12 out of 13 families, the mutation affected the paternal allele (92.3%). In our cohort, the mean paternal age at birth was 32.92 years. Comparing the age of fathers of an affected CHARGE patient with the paternal age of the German population in general, we could not observe any paternal age effect. Taken together, we show in this study that de novo CHD7 mutations occur predominantly in the male germ line.
PMID: 21554267 [PubMed - indexed for MEDLINE]
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