肝部分切除后再生期间胰岛细胞的免疫组织化学研究

成年雌性大鼠50只,分为肝部分切除组、假手术组和正常对照组。手术后d 1、2、3、6、14分批取胰尾。石蜡切片用免疫组织化学PAP法,分别显示含胰岛素的B细胞、含C肽的B细胞、含高糖素的A细胞和含生长抑素的D细胞,观察肝再生期间胰岛B、A和D细胞激素分泌活动的变化。根据胰岛细胞内免疫反应物含量不等,将胰岛细胞分泌活动分成3级:+、++和+++,分别计算各级胰岛细胞所占的百分比,作为判断胰岛细胞激素分泌活动的指标。结果发现,肝部分切除后1～3 d B细胞释放胰岛素活动增强,术后3～6 d转为胰岛素的合成和/或贮存加强。术后1～3d,A细胞逐次增强高糖素的释放。此时,D细胞的释放活动却减弱。至术后d 6,A细胞分泌活动已趋正常,但D细胞增强生长抑素的释放。至术后d 14,胰岛细胞的激素分泌活动均恢复到正常水平。胰岛B细胞和A细胞激素分泌活动的变化,与肝再生过程呈现密切而平行的关系。D细胞的变化则可能反映出对B细胞和A细胞内分泌活动的调控作用。

IMMUNOHISTOCHEMICAL INVESTIGATION OF THE CHANGES OF PANCREATIC ISLET CELLS DURING LIVER REGENERATION FOLLOWING PARTIAL HEPATECTOMY

50 adult albino rats were divided randomly into 3 groups, i, e. partial hepatectomy group, sham-operation group and normal control group. Specimens of tail portion of pancreas were taken at 1, 2, 3, 6 and 14 days after operation respectively. Paraffin sections were made and stained with immunohistochemical PAP method to demonstrate insulin-containing B cells,C-peptide-containing B cells,glucagon-containing A cells and somatostatin-containing .D cells. The changes in hormone secretion activity of B, A and D cells have been observed during liver regeneration period. Based on the different amount of immunoreactive product, the endocrine activity of islet cells can be divided into 3 grades: +, ++, and +++. Percentage of each grade of islet cells was calculated and taken as the parameter of endocrine activity of islet cells. Insulin release activity of B cells increased after 1-3 days of operation, and insulin biosynthesis and/or storage enhanced 3-6 days after. Glucagon release activity of A cells raised gradually during 1-3 days after operation, and somatostatin released activity of D cells declined at the same time. After 6 days, endocrine activity of A cells returned to normal level, but release of somatostatin of D cells elevated. Endocrine activity of islet cells all recovered to normal level 14 days later. The changes of endocrine activity of B cells and A cells were closely related to and parallel with regeneration process of liver. The changes of D cells suggest that it probably be a reflection of regulation action on endocrine activities of B cells and A cells.