Aim:Tight junction is akey connection between intestinal epithelial cells which plays an important role in maintaining the normal permeability of intestinal epithelial *** releasing factor(CRF)iss known to be induced ...
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Aim:Tight junction is akey connection between intestinal epithelial cells which plays an important role in maintaining the normal permeability of intestinal epithelial *** releasing factor(CRF)iss known to be induced bystress and is reported tocause the change of intestinal epithelial *** we showed that cytokeratin 8(CK8)might be implicated in the defense of the mucosal epithelium against stress *** this study we attempt to investigate the potential regulation of CK8 by CRF and to determine its functional ***:The mRNA expression of CRF and protein expression of CRFR1 and CRFR2 was assessed and corticotropin releasing factor(CRF)was used to induce the human HT29 intestinal epithelial cellsfor 72 ***29 cells were divided into 2groups:Control and *** the intestinal epithelial cell permeabilitybetweenthese two groups through Transwell *** the change of morphology and ultrastructure of TJ in each group observed by electron *** the cxpressionCK8 claudin-1Zonulaoccludens protein 1(ZO-1)Occludin and F-actin were assessed by immunofluorescence and Western *** further confirm the RhoA activity at minute 5 10 30 60 and 120 by usingimmunoprecipitation ***:The expression of CRFR1 and CRFR2 in vitro on the surface of HT29 *** could significantly increase the permcabilitv'of macromolecules and disrupt light junction between *** with control groupstimulated CRF significantly increased CK8 levelswith reduced to the expression of claudin-1 ZO-1 Occludin and F-actin *** this stainingwe observed increased fluorescence intensity of CK8 on the contrary these four TJ proteins were *** addition RhoA could be activated by CRF and its activity peaked at 30 ***:The in vitro CRF-evoked upregulation of CK8 expression and increased intestinal epithelial paracellular permeability which may be caused by RhoA activation to mediate F-actin rearrangement
Objective The molecular mechanisms of visceral hypersensitivity are still *** had already proved that antigen presenting dendritic cells(DCs)mediated abnormal immune response play a cardinal role in the formation of v...
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Objective The molecular mechanisms of visceral hypersensitivity are still *** had already proved that antigen presenting dendritic cells(DCs)mediated abnormal immune response play a cardinal role in the formation of visceral hypersensitivity in *** disulfide isomerase A3(PDIA3)is involved in the process of antigen presentation by loaded onto major histocompatibility complex I(MHC I)*** previous work found that stress can significantly induce high level of protein disulfide isomerasc A3(PDIA3)in the colonic mucosa in IBS rat *** in the present study we established a stress related model with visceral hypersensitivity and try to identify the relationship between PDIA3 and dentritic ***:Twenty male rats were chosen to establish a stress related IBS model by intrapcritoneally infused with corticotropin releasing factor(CRF).All rats underwent abdominal withdrawal reflex(AWR)to evaluate visceral *** blotting was used to determine the protein expression of PDIA3 in colonic mucosa DCs from mesenteric lymph nodes were numbered by double labeling immunofluorescent staining of either CD11c(marker of dendritic cells in rats)and *** rat mesenteric lymph nodes dendritic cells(MLNDCs)were obtained by the technique of magnetic bead *** expression of MHCI was tested by the technique of flow cytometry and western *** CD8+Tcclls were isolated and purified by magnetic label-based *** capacity to stimulate CD8+T cells was evaluated by mixed lymphocyte reaction(MLR).Results:In comparison to controls all rats in the model group manifested higher visceral sensitivity(p<0.05).Western blotting showed that protein expression of PDIA3 was up-regulated in colonic mucosa in IBS rats(p<0.05)both CD11c-positive dendritic cells and PDIA3-positive cells observed under fluorescence microscopy were significantly increased in the IBS group compared with the control group(P<0.05)in addition the numb
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