نتایج جستجو برای: crf
تعداد نتایج: 5265 فیلتر نتایج به سال:
Stress induces the release of the peptide corticotropin-releasing factor (CRF) into the ventral tegmental area (VTA), and also increases dopamine levels in brain regions receiving dense VTA input. Therefore, stress may activate the mesolimbic dopamine system in part through the actions of CRF in the VTA. Here, we explored the mechanism by which CRF affects VTA dopamine neuron firing. Using patc...
Stressful events are determinants of relapse in recovering cocaine addicts. Excessive cocaine use may increase susceptibility to stressor-induced relapse through alterations in brain corticotropin-releasing factor (CRF) regulation of neurocircuitry involved in drug seeking. We previously reported that the reinstatement of cocaine seeking by a stressor (footshock) is CRF dependent and is augment...
Allosteric modulators of G-protein-coupled receptors can regulate conformational states involved in receptor activation ( Mol Pharmacol 58: 1412-1423, 2000 ). This hypothesis was investigated for the corticotropin-releasing factor type 1 (CRF(1)) receptor using a novel series of ligands with varying allosteric effect on CRF binding (inhibition to enhancement). For the G-protein-uncoupled recept...
It has been suggested that a sustained rise in resting levels of cytosolic calcium [Ca2+]i of pancreatic islets is responsible for impaired insulin secretion in chronic renal failure (CRF). Evidence for such an event is lacking and the mechanisms through which it may affect insulin secretion are not known. Studies were conducted in normal, CRF, and normocalcemic, parathyroidectomized (PTX) CRF ...
We investigated the effects of corticotropin-releasing factor (CRF) and corticosterone (CORT) on foraging and locomotion in Western spadefoot toad (Spea hammondii) tadpoles and juveniles to assess the behavioral functions of these hormones throughout development. We administered intracerebroventricular injections of ovine CRF or CRF receptor antagonist alphahelical CRF((9-41)) to tadpoles and j...
Corticotropin-releasing factor (CRF) is an important regulator of physiological functions and behavior in stress. Analgesia is one of the characteristics of stress reaction and CRF is involved in providing stress-induced analgesia, however, the underlying mechanisms remain to be determined. Exogenous CRF mimics stress effects on pain sensitivity and causes analgesic effect. The present study wa...
سابقه و هدف: اختلالات سیستم ایمنی یکی از مشکلات اساسی بیماران دیالیزی است وعدم توازن پاسخهایth1 و th2 نقش به سزایی در پیدایش این اختلالات دارد. این سلولها علاوه بر تولید سیتوکاینهای خاص، برخی از مولکولهای کمک محرک نظیر cd26 و cd30 را بطور ترجیحی بیان می نمایند. این مطالعه با هدف تعیین سطح سرمی این مولکولها در بیماران با نارسایی مزمن کلیه (crf) و بیماران تحت دیالیز انجام گردید. مواد و روشها: در ...
مقدمه: نارسایی مزمن کلیه(crf) به نقص غیر قابل برگشت عملکرد کلیه گفته می شود که سیر پیشرونده ای دارد و اکثر این بیماران در نهایت به همودیالیز دائمی نیاز پیدا می کنند . درمان crf به صورت همودیالیز دائم علاوه بر هزینه های زیاد برای جامعه ، مشکلات عمده روحی و جسمی را برای بیمار در بر خواهد داشت. هدف: هدف از مطالعه حاضر شناخت مهمترین علل crf جهت تشخیص به موقع آنها و جلوگیری از پیشرفتشان به منظور به ...
In a series of experiments, we tested the hypothesis that chronic antidepressant drug administration reduces the synaptic availability of corticotropin-releasing factor (CRF) through one or more effects on CRF gene expression or peptide synthesis. We also determined whether effects of acute or chronic stress on CRF gene expression or peptide concentration are influenced by antidepressant drug t...
High cardiorespiratory fitness (CRF) is an important protective factor reducing the risk of cardiac-related disability and mortality. Recent research suggests that high CRF also has protective effects on the brain's macrostructure and functional response. However, little is known about the potential relationship between CRF and the brain's white matter (WM) microstructure. This study explored t...
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