Objective Estrogen may play an important role in visceral pain sensation since chronic visceral pain conditions arc more common in females than in ***(estrogen synthase)the enzyme that catalyzes the transformation of ...
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Objective Estrogen may play an important role in visceral pain sensation since chronic visceral pain conditions arc more common in females than in ***(estrogen synthase)the enzyme that catalyzes the transformation of androgens into estrogens is a member of the P450 superfamily of cytochrome enzymes and a product of the CYP19 *** is well established that the conversion of androgens to estrogens within the central nervous system(CNS)is an essential means by which estrogen regulates many physiological and behavioral processes such as sexual differentiation of the *** rostral ventromedial medulla(RVM)is an essential part of the endogenous pain modulation pathway which project to the spinal cord to facilitate or inhibit nociceptive transmission in the dorsal *** present study was aimed to test the hypothesis that locally synthesized estrogen in RVM may be involved in modulation of visceral pain via activating the G-protein coupled estrogen receptor ***:Immunohistochemical analysis Western blot analysis and behavioral testing of visceral ***:(1)Immunohistochemistry and western blot analysis confirmed the presence of aromatase in ***-expression of aromatase and GPR30 within RVM was confirmed by immunofluorescence assay.(2)The pseudoaffective behavior(abdominal constriction)in response to colorectal distension was enhanced with concomitant increase in phosphorylation of theμ-type opioid receptor(MOR)and decrease in total MOR in RVM in the cyclophosphamide(CPM)-induced chronic cystitis rat model as compared to the control rats indicative of colorectal hyperalgesia.(3)The colorectal hyperalgesia was attenuated by chronic application of the GPR30 antagonist G15 into cerebellomedullary cistern as was the phosphorylation of MOR in RVM of CPM-treated rats.(4)Similarly chronic intracisternal application of the aromatase inhibitors(fadrozole and letrozole)could also attenuate the colorectal hyperalgesia and the phosphorylation of MOR
Objective Inflammatory Bowel Disease(IBD)always exhibits clinical symptoms such as abdominal discomfort and pain and seriously endangering human health with increasing incidence in the *** effective treatment for IB...
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Objective Inflammatory Bowel Disease(IBD)always exhibits clinical symptoms such as abdominal discomfort and pain and seriously endangering human health with increasing incidence in the *** effective treatment for IBD has not been discovered the key to the treatment of pain induced by IBD is inhibiting inflammation and antagonistic transducing molecules involved in the signal transduction of *** we all know interactions of inflammation and the capsaicin receptor(TRPVl)play an important role in the development ofin chronic visceral pain and serotonin(5-HT)alsoplays an important role in intestinal *** is polyphenols which has multiple target effect including anti-inflammatory and analgesic *** research is aimed to study preventive and therapeutic effects of curcumin on inflammation and visceral hyperalgesia of ulcerative colitis and to further explore the mechanisms of 5-HT and TRPVl underlying ***:5%DSS drinking water were provided to Sprague-Dawly(SD)ratsfor continuous 7days to cstablishinflammatory ulcerative colitis model rats receive curcumin(60mg/kg)on the onset or 4day of DSS in preventive group or therapeutic group for 10 days respectively and saline in the saline *** activities index(DAI)were recorded during the process and colon histopathologic score were evaluatedto access anti-inflammatory of effect *** test was conducted withabdominal withdrawal response(AWR)by colorectal distention(CRD)to evaluatethe analgesic effect of Curcumin;Western blotting were applied to delect the expression of 5-HT rate-limiting enzyme tryptophan hydroxylase(TPH)TRPVl and phosphorylatedTRPVl(pTRPV1)on the effect of curcumin;TRPV1channel functions were examined by electrophysiological patch clamp technique on HEK293cells steadily transfectedwith Human TRPV1 plasmid TRPV1 expression was detected both in total and on the surface of membrane after curcumin application with or w ithoutprotein kinase
Treatment of Crohn's disease(CD)and ulcerative colitis(UC)collectively known as inflammatory bowel diseases(IBD)has been a major clinical challenge whereas the incidence of IBD has been on the rise in ***(i...
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Treatment of Crohn's disease(CD)and ulcerative colitis(UC)collectively known as inflammatory bowel diseases(IBD)has been a major clinical challenge whereas the incidence of IBD has been on the rise in ***(ie 5-HT)released from enterochromaffin(EC)cells has recently been shown to promote mucosal immune and inflammatory *** I will present our recent experimental data that support the I channels(the hyperpolarisation-activated cyclic nucleotide-gated cation channels HCNs)as important regulators of EC cell function and *** of HCN2 in EC cells was confirmed by immunohistochemical staining of mouse rat and human gut *** the isolated mouse jejunum and colon adding exogenous cAMP(HCN2 activator)or cholera toxin(which increases endogenous cAMP)both caused an increase in 5-HT outflow which was blocked by ZD7288(HCN2 blocker)as well as mesenteric afferent nerve activity which was blocked by tropisetron(5-HT3R antagonist).In DSS-induced murine IBD model in vitro colonic hypermotility and hypersensitivity were both attenuated by HCN2 blocker *** vivo preemptive and therapeutic administration of ivabradine ameliorated DSS-induced IBD-like disease activity and inflammatory injury of the colon and markedly decreased serum5-HT *** data raised the possibility of manipulating serotonin outflow to tame colonic inflammation and pain by blocking the Ichannels present on EC cells.
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