CRF在大鼠5-HT信号通路和内脏高敏感中的作用

肠易激综合征（IBS）是一种常见的胃肠功能紊乱性疾病,内脏高敏感为其重要生物学指标.5-羟色胺（5-HT）信号通路在介导外周和中枢内脏感觉的传递中发挥重要作用,且与促肾上腺皮质激素释放因子（CRF）关系密切.目的：研究CRF及其不同受体亚型对内脏高敏感大鼠5-HT信号通路的调控作用,探讨IBS内脏高敏感的可能机制.方法：60只Sprague-Dawley大鼠随机分为空白对照组、内脏高敏感模型组、干预对照组、干预一组和干预二组,每组12只.三组干预组大鼠分别于造模前1d侧脑室注射0.9% NaCl溶液、CRF-R1拮抗剂和CRF-R2激动剂.腹部收缩反射（AWR）试验评估大鼠内脏敏感性,免疫组化法检测大鼠脑、脊髓、结肠组织5-HT表达.结果：模型组和干预对照组内脏敏感性显著高于空白对照组,干预一组和干预二组显著低于干预对照组（P〈0.05）.模型组和干预对照组脑组织5-HT表达显著低于空白对照组,脊髓后角和结肠组织5-HT表达显著高于空白对照组（P〈0.05）;干预一组和干预二组脑组织5-HT表达较干预对照组显著上调,脊髓后角和结肠组织5-HT表达较干预对照组显著下调（P〈0.05）.结论：中枢CRF-RI抑制或CRF-R2激活可改变内脏高敏感大鼠脑-肠轴不同部位的5-HT表达,证实CRF对5-HT信号通路具有调控作用,可能是引起IBS内脏高敏感的机制之一.

Role of CRF on 5-HT Signaling Pathway and Visceral Hypersensitivity in Rats

Irritable bowel syndrome(IBS) is a common functional gastrointestinal disorder,and visceral hypersensitivity is the key biological parameter of IBS.5-Hydroxytryptamine(5-HT) signaling pathway plays an important role in mediating both the peripheral and central visceral sensory transmission and has a close relationship with corticotropin-releasing factor(CRF).Aims:To study the regulatory role of CRF and its receptors on 5-HT signaling pathway in visceral hypersensitivity rats,so as to explore the possible me...