大承气汤对烫伤大鼠肠黏膜上皮细胞超微结构变化的影响

目的:了解和揭示大承气汤对SD大鼠烫伤后1周内血浆肿瘤坏死因子、内毒素、肠组织细胞凋亡的影响,观察烫伤大鼠小肠上皮细胞超微结构的变化,探讨本方对肠黏膜屏障保护作用机制。方法:将SD大鼠70只随机分成3组,60只大鼠制备成烫伤模型随机分成中药治疗组(30只)和对照组(30只),中药治疗组给予大承气汤,对照组给予生理盐水灌胃;第3组为正常组10只。治疗组和对照组在给药后第1、3、7天各处死10只,均检测血浆肿瘤坏死因子、内毒素的含量,观察大鼠肠组织细胞凋亡的变化,给药后第7天观察大鼠小肠上皮细胞超微结构变化。结果:大承气汤可明显抑制烫伤大鼠内毒素易位,减少肿瘤坏死因子的产生,抑制肠组织细胞凋亡,明显修复和改善烫伤大鼠肠黏膜细胞超微结构的损伤。结论:中药方剂大承气汤有较理想的肠道屏障保护作用,是预防和治疗肠道屏障功能障碍引发的多器官、多系统功能衰竭的有效的方药。

中药复方便可通片对烫伤大鼠肠黏膜屏障保护作用的实验研究

目的:了解和揭示便可通对SD大鼠烫伤后1周内血浆肿瘤坏死因子、内毒素、肠组织细胞凋亡的影响,观察烫伤大鼠小肠上皮细胞超微结构的变化,探讨本药对肠黏膜屏障保护作用机制。方法:将SD大鼠70只随机分成3组,第1组为中药治疗组(便可通组)30只;第2组为对照组(单纯烫伤组)30只,制备成烫伤模型,给予生理盐水灌胃;第3组为正常组10只。治疗组和对照组在给药后第1、3、7天各处死10只,均检测血浆肿瘤坏死因子、内毒素的含量,观察大鼠肠组织细胞凋亡的变化,给药后第7天观察大鼠小肠上皮细胞超微结构变化。结果:便可通可明显抑制烫伤大鼠内毒素易位,减少肿瘤坏死因子的产生,抑制肠组织细胞凋亡,明显修复和改善烫伤大鼠肠黏膜细胞超微结构的损伤。结论:中医复方便可通有较理想的肠道屏障保护作用,是预防和治疗肠道屏障功能障碍引发的多器官、多系统功能衰竭的有效的药物。

Apoptotic cell death and its relationship to gastric carcinogenesis

AIM: To investigate the apoptotic process of cells with in the intestinal metaplasia areas co-localizing with chronic gastritis and gastric carcinomas and to analyze the involvement of proteins regulating apoptosis in the process of intestinal metaplasia related gastric carcinogenesis. METHODS: Forty-two gastric carcinoma and seventeen chronic gastritis cases were included in this study. All cases were examined for the existence of intestinal metaplasia. Ten cases randomly selected from each group were processed for TUNEL assay. TUNEL positive cells within the intestinal metaplasia areas, co-localizing either to gastric carcinoma or chronic gastritis, were counted and converted to apoptotic indices. In addition, p53, bcl-2 and bax expression patterns within these tissues were analyzed on the basis of immunohistochemistry. RESULTS: Twenty-eight of the cases were intestinal and 14 of the cases were diffuse type adenocarcinomas. 64% (27/42) of the gastric carcinoma cases had intestinal metaplasia. Intestinal metaplasia co-localized more with intestinal type carcinomas compared with diffuse type carcinomas [75% (21/28) vs 42% (6/14), respectively; P ≤0.05]. The mean apoptotic index in tumor cells was 0.70±0.08. The mean apoptotic index in intestinal metaplasias co-localizing to tumors was significantly higher than that of intestinal metaplasias co-localizing to chronic gastritis (0.70±0.03 vs 0.09±0.01, respectively; P≤0.05). p53 positivity was not observed in areas of intestinal metaplasia adjacent to tumors or chronic gastritis. Intestinal metaplasia areas adjacent to tumors showed lower cytoplasmic bcl-2 positivity compared to intestinal metaplasia areas adjacent to chronic gastritis [55.5% (15/27) vs 70.5% (12/17), respectively]. On the other hand, intestinal metaplasia areas adjacent to tumors showed significantly higher cytoplasmic bax positivity compared to intestinal metaplasia areas adjacent to chronic gastritis [44.4% (12/27) vs 11.7% (2/17), respectively; P ≤0.05]. CONCLUSION: Existence of apoptotic cells on the basis of TUNEL positivity is shown in intestinal metaplasias co-localizing to both diffuse and intestinal type gastric cancers in this study. Our results also suggested bax expression dependent induction of apoptosis especially in intestinal metaplasia areas adjacent to tumors. These findings strongly support the involvement of apoptotic mechanisms in the process of gastric carcinogenesis especially in the transition from intestinal metaplasia to gastric cancer. It may be suggested that induction of apoptosis in intestinal metaplasia areas adjacent to tumors may involve different mechanisms than induction by chronic inflammation.