辣椒素受体拮抗剂治疗避水应激引起内脏痛觉过敏作用

目的研究避水应激引起内脏痛觉敏感性的变化及特异性辣椒素受体(VR1)拮抗剂辣椒平与非特异性VR1拮抗剂钌红对避水应激引起内脏痛觉过敏的治疗作用。方法将6周龄雄性Wistar大鼠54只分为无应激对照组(Neg组,n=18)、生理盐水对照组(NS组,n=12)、辣椒平治疗组(CZP组,n=12)、钌红治疗组(RR组,n=12),Neg组又分为三个小组,分别为直肠内注入生理盐水组、直肠内注入辣椒素组、直肠扩张组,NS组、CZP组和RR组只分为直肠内注入辣椒素组和直肠扩张组两小组,每小组均为6只动物。给予避水应激,每天1h连续10d。第11天Neg组与NS组腹腔注射溶媒,CZP组腹腔注射辣椒平,RR组腹腔注射钌红,30min后每小组6只动物直肠内注入生理盐水或辣椒素,进行疼痛评分,或给予结直肠扩张(CRD)刺激,进行腹直肌肌电记录。结果避水应激引起动物对直肠注射辣椒素敏感性增加,腹腔注射辣椒平与钌红均能抑制注射辣椒素引起的疼痛反应;避水应激也引起动物CRD刺激后腹直肌肌电活动增加,腹腔注射辣椒平与钌红均能降低肌电活动的增加幅度,而钌红则完全抑制肌电活动的增加。结论辣椒素受体拮抗剂可抑制避水应激引起的内脏痛觉过敏,辣椒...

Effects of Vanilloid Receptor Antagopnists on Visceral Hypersensitivity Induced by Water Avoid Stress

Objective To evaluate the visceral sensitivity after water-avoid stress and the effects of capsazepine and ruthenium red on visceral hypersensitivity induced by water-avoid stress. Methods 54 Wistar rats were divided into non-stress group (group Neg, n=18), normal saline group (group NS, n=12), capsazepine group (group CZP, n=12) and ruthenium red group (group RR, n=12). There were three subgroups of rates in the group Neg (intracolonic injection of NS, capsaicin and colorectal distention), and two subgroup...