论文部分内容阅读
目的:研究金荞麦片对脾虚湿热证肠易激综合征腹泻型(diarrhea-predominant irritable bowel syndrome,IBS-D)大鼠免疫炎症和内脏高敏感性的影响.方法:选取SPF级新生SD大鼠,采用高乳糖饲料+慢性束缚+夹尾刺激诱导IBS-D大鼠模型.造模成功后,将实验动将物随机分为正常对照组(A组)、模型对照组(B组)、金荞麦片高剂量组(C组)、中剂量组(D组)、低剂量组(E组)、谷参肠安组(F组),金荞麦片组分别给予高剂量[6 g/(kg·d)]、中剂量[3 g/(kg·d)]和低剂量[1.5 g/(kg·d)]中药灌胃,谷参肠安组给予谷参肠安2 g/(kg·d),正常组和模型组分别给予等容积生理盐水灌胃,1次/d.灌胃4 wk后,行直肠内球囊扩张实验(colorectal distention,CRD),观察腹肌收缩反射(abdominal withdrawal reflex,AWR),评估大鼠结肠转运和感觉功能,放射免疫法检测血清肿瘤坏死因子-(tumor necrosis factor-,TNF-)、白介素-17(interleukin 17,IL-17)、IL-10、P物质(substance P,SP)和降钙素基因相关肽(calcitonin gene-related peptide,CGRP)含量,荧光定量PCR检测肠组织5-羟色胺(5-hydroxytryptamine,5-HT)、5-羟色胺3受体(5-hydroxytryptamine 3 receptor,5-HT3R)、神经激肽受体-1(neurokinin receptor 1,NK1R)和细胞间黏附分子(intracellular adhesion molecule-1,ICAM-1)mRNA表达水平.结果:与模型组比较,金荞麦片各剂量组大鼠结肠转运功能及内脏高敏感性明显降低(P<0.05或0.01),大鼠血清TNF-(2.81 ng/L±0.67 ng/L,2.76 ng/L±0.31 ng/L,2.91 ng/L±0.77 ng/L vs 3.77 ng/L±0.44 ng/L)、IL-17(2.01 ng/L±0.76 ng/L,2.14 ng/L±0.29ng/L,1.98 ng/L±0.11 ng/L vs 2.47 ng/L±0.33 ng/L)及SP(38.22 pg/mL±3.15 pg/mL,37.55 pg/mL±2.63 pg/mL,42.01 pg/mL±3.79pg/mL vs 43.19 pg/mL±4.28 pg/mL)含量均较模型组降低.IL-10(137.25 ng/L±6.2 ng/L,135.90 ng/L±4.4 ng/L,121.70 ng/L±5.11 ng/L vs 82.09 ng/L±5.33 ng/L)和CGRP(155.09 ng/L±4.38 ng/L,142.02 ng/L±2.44 ng/L,158.25ng/L±4.02 ng/L vs 107.31 ng/L±3.96 ng/L)明显升高(P<0.05或0.01).肠组织5-HT(0.74±0.43,0.97±0.91,0.66±0.29 vs 1.27±0.45)、5-HT3R(1.01±0.35,1.14±0.76,1.47±0.65 vs1.61±0.03)、NK1R(1.07±0.58,0.98±0.67,0.88±0.79 vs 1.47±0.94)和ICAM-1(0.81±0.55,0.96±0.19,0.72±0.93 vs 1.33±0.26)mRNA表达水平下调(P<0.05或0.01),尤以金荞麦片高剂量组为优.结论:金荞麦片可降低IBS-D大鼠内脏高敏感性,有效抑制免疫炎症反应,多靶点、多层次地参与调节胃肠动力.金荞麦片对实验性IBS-D具有量效依赖作用.