大鼠实验性胃溃疡自愈期间胃窦粘膜G、D细胞变化的免疫组织化学研究

本实验用成年雄性Wistar大鼠53只,分为溃疡组、盐水对照组和正常对照组。在手术后4、10,14、21及28天分批取材。用Sternberger PAP法进行免疫组织化学染色,分别显示胃窦粘膜胃泌素细胞(G细胞)和生长抑素细胞(D细胞),观察大鼠实验性胃溃疡自愈期间,G和D细胞的形态变化,并进行了细胞计数和统计学分析。本文结果表示,溃疡组G细胞数量在术后10至14天明显增多(P<0.01),21、28天趋于减少,但仍高于对照组。有些G细胞排列成群,密集呈明显带状。正常时G细胞分布在幽门腺的中、下1/3处,而溃疡组可见有些G细胞分布在腺的上部。D细胞数量仅在术后10天增多(P<0.01),与正常对照组相比差异显著。用免疫组织化学双重染色法,可见G细胞和D细胞之间存在着形态上的接触。溃疡自愈期间,G/D细胞比值未见明显改变。本实验结果提示,胃窦粘膜局部G、D细胞的变化和大鼠实验性胃溃疡自愈修复之间有着一定的联系。

IMMUNOHISTOCHEMICAL STUDIES OF G-CELL AND D-CELL CHANGES IN THE ANTRAL MUCOSA OF RATS DURING EXPERIMENTAL GASTRIC ULCER

53 male Wistar rats were divided into three groups, i.e. experimental ulcer group, saline control group and normal control group. The antral tissues were prepared for immunohistochemical staining at 4th, 10th, 14th, 21st and 28th days after operation. Sternberger's PAP method was used to demonstrate the gastrin cells (G cells) and somatostatin cells (D cells)in the antral mucosa in order to observe their changes during experimental gastric ulcer. The morphological relationships of G cells and D cells were examined by simultaneous double immunostaining method.The results indicated that the G cells count as well as D cells count in the antral mucosa was increased (P<0.01, P<0.05, respectively) at 10 th day after operation. The G cells count was highest at 14th day (P<0.01) and then tended to decrease from 21st to 28th day, but it was still statistically higher than that of the saline and normal control groups. The ratio of G/D cells did not show significant change. Some G cells showed characteritic features of clusters of three or four cells and some G cells were found upward in the pyloric gland during gastric ulceration. D cells possessed processes and contacted with neighbouring G cells.The present work suggests that G cells and D cells in antral mucosa perhaps participate in the regulative activity of self healing process of the gastric ulcer.