水通道蛋白3、4、8在大鼠慢传输型便秘模型结肠黏膜中的表达

目的探讨水通道蛋白（AQP）3、4、8在大鼠慢传输型便秘（STC）模型中的表达情况。方法利用复方地芬诺酯灌胃的方法建立大鼠STC模型,采用RT—PCR方法测定STC组（16只）及对照组大鼠（16只）升、降结肠黏膜的AQP3、4、8mRNA表达情况。结果STC组与对照组升结肠、降结肠AQP3平均相对表达量分别为0．344和0．602（P〈0．05）、0．419和0．509（P〉0．05）：STC组和对照组升结肠、降结肠AQP4平均相对表达量分别为0．764和0．759（P〉0．05）、0．776和0．736（P〉0．05）;AQP8在实验组和对照组升降结肠中未见明显表达。结论AQP3在STC大鼠的升结肠黏膜中表达下调,对水吸收起调节作用：AQP4和AQP8的表达无明显变化。

Expression of aquaporin 3, 4, and 8 in colonic mucosa of rat models with slow transit constipation

Objective To investigate the expression of aquaporin 3, 4, and 8 in the colonic mucosa of rat models with slow transit constipation (STC). Methods STC rat model was established by giving the rats the compound solution of diphenoxylate. Real time polymerase chain reaction (RT-PCR) was used to measure the expression of aquaporin mRNA in colonic mucosa of STC rat models (study group,n= 16) and normal rats (control group,n=16). Cray scale ratio of aquaporin to β-action (internal reference) was used for quantification. Results RT-PCR revealed that the mean gray scale ratios of aquaporin 3 in the proximal colon of the study group and control group were 0.344 and 0.602 (P<0.05), and were 0.419 and 0.509 in the distal colon (P>0.05), respectively. The mean gray scale ratios of aquaporin 4 in the proximal and the distal colon were 0.764 and 0.759 in the study group (P>0.05), and were 0.776 and 0.736 in the control group (P>0.05), respectively. However, there was no expression of aquaporin 8 in the proximal and the distal colon in either the study group or the control groups. Conclusions Expression of aquaporin 3 in the proximal colon of STC rat models is down-regulated, which regulates water absorption. There are no significant changes in the expressions of aquaporin 4 and 8.