Knospung-steuernde Gene in Hydra vulgaris: Ein evolutionsgeschichtlich alter FGFR kontrolliert die Knopsenablösung

Mittels eine Genexpressions-Screening wurde eine Fibroblasten-Wachstums-Faktor-Rezeptor(FGFR)-ähnliche Tyrosinkinase (Kringelchen)in Hydra vulgaris identifiziert.Das Hochdynamisch regulierte Expressionsmuster während der Knospung deutet darauf hin, dass Kringelchen eine wichtige Rolle bei der Vegetativen Fortpflanzung in Hydra spielt. Durch Behandlung mit SU5402, einen spezifischen Inhibitor für FGFR, und ducht Elektroporation von Antisense-Oligonukleotiden konnten verzweigte Polypen erzeugt werden. Das Ablösen der Knospe wurde verhindert. Das führte zu der Hypothese, dass Kringelchen essentiell ist für die korrekte Knospenablösung. Die Analyse von kringelchen-Expressionsmustern während der Regeneration von Kopf-und Fußstrukturen und der Entwicklung von Hydra aus Einzelzellaggregaten deuteten eine Beteiligung An der Achsenbildung hin. Die Identifikation eines FGF-ähnlichen Proteins bei Hydra legt die Vermutung nahe, dass Kringlechen an FGF-Liganden binden kann

Differential effects on inhibition of cholesterol absorption by plant stanol and plant sterol esters in apoE−/− mice

Aims 'Functional foods'; supplemented with plant sterol esters (PSE) and plant stanol esters (PSA) are therapeutic options for the management of hypercholesterolaemia. However, their effects on blood monocytes, endothelial function, atherogenesis, and sterol tissue concentrations are poorly understood. Methods and results Male apoE−/− mice (n= 30) were randomized to three different diets for 6 weeks (n= 10 per group): high-cholesterol (1.25%) western-type diet (WTD), WTD + 2% PSE, and WTD + 2% PSA. Both supplements reduced serum cholesterol. WTD + PSE resulted in increased plant sterol serum concentrations and increased inflammatory Ly-6C(high) monocyte numbers. WTD + PSA increased plant stanol serum concentrations and Ly-6C-monocyte numbers, but decreased vascular superoxide release, lipid hydroperoxides, and inflammatory cytokines in aortic tissue, in plasma, and in circulating monocytes. Despite reduced serum cholesterol concentrations, both supplements impaired endothelial vasodilation compared with WTD. WTD + PSA reduced the development of atherosclerotic lesions compared with WTD alone (12.7 ± 3.7 vs. 28.3 ± 3.5%), and WTD + PSE was less effective (17.5 ± 3.7%). WTD + PSE and WTD + PSA reduced the cholesterol content in the liver, but not in the brain. However, WTD + PSE and WTD + PSA increased plant sterol and plant stanol concentrations in the liver as well as in the brain. Conclusion PSE and PSA supplementation reduced serum cholesterol, but increased plant sterol and plant stanol concentrations. Elevated levels of PSE and PSA were associated with endothelial dysfunction and increased central nervous system depositions. Atherosclerotic lesion retardation was more pronounced in WTD + PSA, coinciding with higher regenerative monocyte numbers, decreased oxidative stress, and decreased inflammatory cytokines compared with WTD + PSE

Controversial role of plant sterol esters in the management of hypercholesterolaemia

Hypercholesterolaemia is a risk factor of cardiovascular diseases and is therefore a major target for primary and secondary prevention. Maintaining a healthy diet and lifestyle reduces cardiovascular risk. 'Functional foods'; supplemented with phytosterols are advertised for the management of hypercholesterolaemia and have become a widely used non-prescription approach to lower plasma cholesterol levels. It is estimated that in 2005 worldwide 3 billion US-dollars were spent on various functional foods that have regulator-approved health claims for the management of elevated cholesterol levels. In September 2000, the US Food and Drug Administration (FDA) issued an interim final rule allowing a health claim for reducing the risk of coronary heart disease for foods that contain phytosterols and are low in saturated fat and cholesterol. In fact, this was only the 12th time the FDA has authorized a health claim. The National Cholesterol Education Program Expert Panel (NCEP ATP III) recommends since 2001 phytosterol enriched functional foods as part of an optimal dietetic prevention strategy in primary and secondary prevention of cardiovascular diseases. The American Heart Association (AHA) has followed and sees phytosterols 'as a therapeutic option ... for individuals with elevated cholesterol levels';. Since then other well-esteemed societies such as the Spanish Cardiology Society, the Association of Clinical and Public Health Nutritionists in Finland, and the National Heart Foundation in Australia, to name only a few, have identified phytosterols as an important additional dietary option in the management of hypercholesterolaemia. However, recently released guidelines are more critical of food supplementation with phytosterols and draw attention to significant safety issues

Interpretation of chronic pain clinical trial outcomes: IMMPACT recommended considerations

Interpreting randomized clinical trials (RCTs) is crucial to making decisions regarding the use of analgesic treatments in clinical practice. In this article, we report on an Initiative on Methods, Measurement, and Pain Assessment in Clinical Trials (IMMPACT) consensus meeting organized by the Analgesic, Anesthetic, and Addiction Clinical Trial Translations, Innovations, Opportunities, and Networks (ACTTION), the purpose of which was to recommend approaches that facilitate interpretation of analgesic RCTs. We review issues to consider when drawing conclusions from RCTs, as well as common methods for reporting RCT results and the limitations of each method. These issues include the type of trial, study design, statistical analysis methods, magnitude of the estimated beneficial and harmful effects and associated precision, availability of alternative treatments and their benefit-risk profile, clinical importance of the change from baseline both within and between groups, presentation of the outcome data, and the limitations of the approaches used