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BACKGROUND A subset of patients with irritable bowel syndrome (IBS) have an increased number of mast cells (MCs) in the colonic mucosa. Psychological factors are believed to contribute to the course of IBS. AIMS To examine associations between fatigue, depression and MCs of the colonic mucosa in IBS. METHODS Colonic biopsies were taken from 50 Rome II(More)
The transcription factor NF-kappa B regulates genes participating in immune and inflammatory responses. In T lymphocytes, NF-kappa B is sequestered in the cytosol by the inhibitor I kappa B-alpha and released after serine phosphorylation of I kappa B-alpha that regulates its ubiquitin-dependent degradation. We report an alternative mechanism of NF-kappa B(More)
The transcription factor nuclear factor (NF) kappaB is involved in the regulation of cell survival. NFkappaB is activated in many malignant tumors and seems to play a role in the resistance to cytostatic treatments and escape from apoptosis. We have studied the effects on NFkappaB activation of two topoisomerase poisons and DNA damaging agents that are used(More)
Acute myeloid leukemia (AML) cells carry molecular defects that promote their leukemic proliferation, resistance to apoptosis and defect in differentiation. Pharmacological targeting of the nuclear factor kappaB (NF-kappaB) pathway has been shown to promote apoptosis of primary AML cells and to sensitize blasts to neoplastic drugs (Frelin, Blood 2005, 105,(More)
Rapid tyrosine phosphorylation of key cellular proteins is a crucial event in the transduction of activation signals to T-lymphocytes. The regulatory role of protein tyrosine phosphatases (PTPases) in this process was explored by studying the effects of a powerful PTPase inhibitor, vanadate peroxide (pervanadate), on the activation cascade of Jurkat human(More)
NGF has been shown to support neuron survival by activating the transcription factor nuclear factor-kappaB (NFkappaB). We investigated the effect of NGF on the expression of Bcl-xL, an anti-apoptotic Bcl-2 family protein. Treatment of rat pheochromocytoma PC12 cells, human neuroblastoma SH-SY5Y cells, or primary rat hippocampal neurons with NGF (0.1-10(More)
Phosphorylation of the N-terminal domain of I kappa B inhibitory subunits induces activation of the transcription factor NF-kappa B. Although serine phosphorylation has been shown to induce ubiquitination and subsequent proteasome-mediated degradation of I kappa B-alpha, little is known about the mechanisms that lead to release of active NF-kappa B in T(More)
Apoptosis is mediated by cysteine-dependent, aspartate-directed proteases of the caspase family that proteolyse strategic intracellular substrates to induce cell suicide. We describe here that engagement of apoptotic processes by Fas triggering or by staurosporine stimulation leads to the caspase-dependent inactivation of the nuclear factor kappa B(More)
Tumor necrosis factor-alpha (TNF) exerts its transcriptional effects via activation of nuclear transcription factor-kappa B (NF-kappaB). NF-kappaB is sequestered in the cytosol by Ikappa Balpha and, in most cells, released upon serine phosphorylation of this inhibitory protein which then undergoes rapid, ubiquitin-dependent degradation. In contrast, we find(More)