乳癌相关肽及肠三叶因子在应激胃粘膜损伤的早期修复作用

ROLE OF pS_2 AND INTESTINA TREFOIL FACTOR(ITF) IN THE EARLY PHASE OF EPITHELIAL REPAIR OF STRESS-INDUCED GASTRIC LESION

为了研究乳癌相关肽 (pS2 ,为三叶肽家族一员 )、肠三叶因子 (intestinaltrefoilfactor,ITF ;为三叶肽家族一员 )在水浸束缚应激(WRS)大鼠胃粘膜基因表达变化 ,探讨其在应激胃粘膜损伤的早期修复作用。采用单次水浸束缚应激制作模型 ,动态监测胃粘膜血流量(GMBF) ,大体及光镜下观察粘膜损伤程度(UI)及组织学变化 ,逆转录 多聚酶链反应 (RT PCR)检测pS2 、ITF基因表达变化 ,免疫组化染色进一步证实其表达。结果显示 :应激造成胃粘膜广泛损伤 ,但损伤指数在 2、4、8h逐渐减小 ,至 8h降为 6 4 9% ,GMBF逐渐恢复 ,至8h上升为正常的 89 8% ,ITF基因表达逐渐增强(0 0 2 2±0 0 0 1vs0 177±0 0 10 ,P <0 0 1) ,免疫组化染色计分为 (0 134± 0 0 0 1vs0 2 5 3±0 0 1,P <0 0 1) ;pS2 基因表达逐渐增强 (0 5 1± 0 14vs 0 77± 0 11,P <0 0 1) ,免疫组化染色计分为 (0 95± 0 11vs 1 4 1± 0 0 4 ,P <0 0 1)。提示pS2 。

To determine the role of pS 2 and ITF(both are members of trefoil peptides) in the early phase of epithelial repair of stress induced gastric lesion. Wistar rats were exposed to water immersion restraint stress(WRS) for 4h, gastric mucosal blood flow(GMBF) was measured with LDF 3 flowmeter, and the extent of gastric mucosal lesions was evaluated grossly and histologically. Expression of pS 2 and ITF mRNA was determined with RT PCR, and further examined with immunohistochemistry. The results showed that a single infliction of WRS produced numerous gastric mucosal erosions, but the number of these lesions gradually decreased and GMBF recovered at 2, 4, 8h after stress. The area of gastric mucosal lesion was reduced by 64 9% and GMBF being increased by 89 8% at 8h. Healing of stress induced ulcerations was accompanied by an increase in the expression of pS 2 (0 51±0 14 vs 0 77±0 11, P <0 01),and the result was confirmed further with immunohistochemistry(0 95±0 11 vs 1 41±0 04, P <0 01). There was also an increase in expression of ITF(0 022±0 001 vs 0 177±0 010, P <0 01), and it was demonstrated further with immunohistochemistry(0 134±0 001 vs 0 253±0 01, P <0 01). These fingings suggest that both pS 2 and ITF might participate in the early phase of repair of the gestric mucosa.