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世界核心医学期刊文摘（胃肠病学分册） 2006年第11期2卷 32-32页

作者： guagnini f. Valenti M. Mukenge S. T. Croci 尹勇 Sanof.-Midy Research Centre Sanori-Aventis Via GB Piranesi 38 20137 Milan Italy Dr.

Background and aims: Diverticulosis is a common disease of.not completely def.ned pathogenesis. Motor abnormalities of.the intestinal wall have been f.equently described but very little is known about their mechanisms. We investigated in vitro the neural response of.colonic longitudinal muscle strips f.om patients undergoing surgery f.r complicated diverticular disease (diverticulitis). Methods: The neural contractile response to electrical f.eld stimulation of.longitudinal muscle strips f.om the colon of.patients undergoing surgery f.r colonic cancer or diverticulitis was challenged by dif.erent receptor agonists and antagonists. Results: Contractions of.colonic strips f.om healthy controls and diverticulitis specimens were abolished by atropine. The βadrenergic agonist (-) isoprenaline and the tachykinin NK1 receptor antagonist SR140333 had similar potency in reducing the electrical twitch response in controls and diseased tissues, while the cannabinoid receptor agonist (+)WIN 55,212-2 was 100 times more potent in inhibiting contractions in controls (IC50 42 nmol/l) than in diverticulitis strips. SR141716, a selective antagonist of.the cannabinoid CB1 receptor, had no intrinsic activity in control preparations but potentiated the neural twitch in diseased tissues by up to 196%in a concentration dependent manner. SR141716 inhibited (+)WIN 55,212-2 induced relaxation in control strips but had no ef.icacy on (+)WIN 55,212-2 responses in strips f.om diverticular disease patients. Colonic levels of.the endogenous ligand of.cannabinoid and vanilloid TRPV1 receptors anandamide were more than twice those of.control tissues (54 v 127 pmol/g tissue). The axonal conduction blocker tetrodotoxin had opposite ef.ects in the two preparations, completely inhibiting the contractions of.control strips but potentiating those in diverticular preparations, an ef.ect selectively inhibited by SR140333. Conclusions: Neural control of.colon motility is prof.undly altered in patients with

关键词：憩室病 P物质大麻醇结肠动力肌束颤搐反应受体激动剂受体拮抗剂憩室炎内在活性

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