AIM: To study the molecular forms of trefoil factor 1 (TFF1) in normal gastric mucosa and its expression in normal and abnormal gastric tissues (gastric carcinoma, atypical hyperplasia and intestinalized gastric m...AIM: To study the molecular forms of trefoil factor 1 (TFF1) in normal gastric mucosa and its expression in normal and abnormal gastric tissues (gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa) and the role of TFF1 in the carcinogenesis and progression of gastric carcinoma and its molecular biological mechanism underlying gastric mucosa protection. METHODS: The molecular forms of TFF1 in normal gastric mucosa were observed by Western blot. The expression of TFF1 in normal and abnormal gastric tissues (gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa) was also assayed by immunohistochemical method. The average positive AO was estimated by Motic Images Advanced 3.0 software. RESULTS: Three patterns of TFF1 were found in normal gastric mucosa: monomer, dimmer, and TFF1 compound whose molecular weight is about 21 kDa. The concentration of TFF1 compound was the highest among these three patterns. TFF1 was expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum, especially around the nuclei. The closer the TFF1 to the lumen, the higher the expression of TFF1, The expression of TFF1 in peripheral tissue of gastric carcinoma (0.51 ± 0.07) was higher than that in normal gastric mucosa (0.44 ± 0.06, P 〈 0.001). The expression of TFF1 in gastric adenocarcinoma was positively related to the differentiation of adenocarcinoma. The lower the differentiation of adenocarcinoma was, the weaker the expression of TFF1. No TFF1 was expressed in poorlydifferentiated adenocarcinoma. The expression of TFF1 in moderately-well differentiated adenocarcinoma (0.45 ± 0.07) was a little lower than that in normal mucosa (P 〉 0.05). The expression of TFF1 in gastric mucosa with atypical hyperplasia (0.57 ± 0.03) was significantly higher than that in normal gastric mucosa (P 〈 0.001). No TFF1 was expressed in intestinalized gastric mucosa. There was no statistically significant difference between the expressions of TFFI in gastric mucosa around the intestinalized tissue (0.45 ± 0.07) and normal gastric mucosa (P 〉 0.05). CONCLUSION: TFF1 is expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum. Its main pattern is TFF1 compound, which may have a greater biological activity than monomer and dimer. The expression of TFF1 in peripheral mucosa of gastric ulcer is higher than that in mucosa 5 cm beyond the ulcer, indicating that TFF1 plays an important part in protection and restitution of gastric mucosa. The expression of TFF1 is increased in peripheral tissues of gastric carcinoma and gastric mucosa with atypical hyperplasia, but is decreased in cancer tissues, implying that TFF1 may be related to suppression and differentiation of carcinoma. The weaker expression of TFF1 in poorly-differentiated carcinoma may be related to the destruction of glands and cells in cancer tissues and the decrease in secretion of TFF1.展开更多
文摘AIM: To study the molecular forms of trefoil factor 1 (TFF1) in normal gastric mucosa and its expression in normal and abnormal gastric tissues (gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa) and the role of TFF1 in the carcinogenesis and progression of gastric carcinoma and its molecular biological mechanism underlying gastric mucosa protection. METHODS: The molecular forms of TFF1 in normal gastric mucosa were observed by Western blot. The expression of TFF1 in normal and abnormal gastric tissues (gastric carcinoma, atypical hyperplasia and intestinalized gastric mucosa) was also assayed by immunohistochemical method. The average positive AO was estimated by Motic Images Advanced 3.0 software. RESULTS: Three patterns of TFF1 were found in normal gastric mucosa: monomer, dimmer, and TFF1 compound whose molecular weight is about 21 kDa. The concentration of TFF1 compound was the highest among these three patterns. TFF1 was expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum, especially around the nuclei. The closer the TFF1 to the lumen, the higher the expression of TFF1, The expression of TFF1 in peripheral tissue of gastric carcinoma (0.51 ± 0.07) was higher than that in normal gastric mucosa (0.44 ± 0.06, P 〈 0.001). The expression of TFF1 in gastric adenocarcinoma was positively related to the differentiation of adenocarcinoma. The lower the differentiation of adenocarcinoma was, the weaker the expression of TFF1. No TFF1 was expressed in poorlydifferentiated adenocarcinoma. The expression of TFF1 in moderately-well differentiated adenocarcinoma (0.45 ± 0.07) was a little lower than that in normal mucosa (P 〉 0.05). The expression of TFF1 in gastric mucosa with atypical hyperplasia (0.57 ± 0.03) was significantly higher than that in normal gastric mucosa (P 〈 0.001). No TFF1 was expressed in intestinalized gastric mucosa. There was no statistically significant difference between the expressions of TFFI in gastric mucosa around the intestinalized tissue (0.45 ± 0.07) and normal gastric mucosa (P 〉 0.05). CONCLUSION: TFF1 is expressed mainly in epithelial cytoplasm of the mucosa in gastric body and antrum. Its main pattern is TFF1 compound, which may have a greater biological activity than monomer and dimer. The expression of TFF1 in peripheral mucosa of gastric ulcer is higher than that in mucosa 5 cm beyond the ulcer, indicating that TFF1 plays an important part in protection and restitution of gastric mucosa. The expression of TFF1 is increased in peripheral tissues of gastric carcinoma and gastric mucosa with atypical hyperplasia, but is decreased in cancer tissues, implying that TFF1 may be related to suppression and differentiation of carcinoma. The weaker expression of TFF1 in poorly-differentiated carcinoma may be related to the destruction of glands and cells in cancer tissues and the decrease in secretion of TFF1.
文摘目的 通过测定三叶因子1(TFF1)蛋白在胃癌和胃溃疡组织中的表达情况,探讨组织TFF1蛋白表达水平在胃癌及胃溃疡中的临床意义.方法 56份胃黏膜标本取自18例正常对照者,25例胃溃疡和13例溃疡型胃癌患者,采用免疫组化法测定胃黏膜中TFF1蛋白的表达.结果 胃溃疡和溃疡旁组织、胃癌旁组织中TFF1表达明显高于正常胃黏膜和胃癌组织(均P<0.001),胃癌组织TFF1表达则明显低于正常胃黏膜(P<0.001);TFF1升高增加患者罹患胃溃疡风险(OR:1.365,95% CI 1.065~1.749,P<0.05); TFF1表达下调则增高患者罹患胃癌风险(OR:3.067,95% CI 1.391~6.757,P<0.01).结论 TFF1在胃黏膜保护、损伤修护具有一定的作用;TFF1蛋白在胃溃疡中高表达,而在胃癌中表达明显降低,检测TFF1蛋白表达有利于胃癌与胃溃疡的鉴别诊断.