BACKGROUND:hIL-24, a tumor suppressor gene, can stimulate immune responses, inhibit the growth of tumor cel s, and the formation of tumor vessels, and induce cel apoptosis. OBJECTIVE:To explore the effects of hIL-24 gene on the proliferation and apoptosis of fibroblasts in the keloid and the underlying mechanisms. METHODS:Al the keloid specimens col ected from 13 patients were used for fibroblast culture and indentification. Fibroblast of the keloid was transfected with or without hlL-24 lentivirus. Subsequently, mRNA expressions of transforming growth factor-β, Smad3, proliferating cel nuclear antigen, matrix metal oproteinase-2,-9, and metal opeptidase inhibitor 1 were determined. RESULTS AND CONCLUSION:Immunofluorescent staining and flow cytometry showed that vimentin antibody was expressed positively in cytoplasma of fibroblast cultures, and the purity was more than 97.8%. Western blot assay showed that hIL-24 expression was significantly increased in the transfected fibroblasts. Quantitative PCR showed that the overexpression rate of hIL-24 in fibroblasts was 81.7%and mRNA expressions of transforming growth factor-β, Smad3, proliferating cel nuclear antigen, matrix metal oproteinase-2, and-9 were significantly decreased, while metal opeptidase inhibitor 1 mRNA expression was significantly increased in hIL-24 transfection group compared with control group (P<0.05). These findings suggest that hIL-24 gene inhibits the expressions of proliferating cel nuclear antigen, matrix metal oproteinase-2, and-9 in fibroblasts, and the underlying mechanism may involves TGF-β/Smad3 pathway.%背景：hIL-24基因是研究较明确的肿瘤抑制基因，既可以表达免疫系统刺激蛋白，刺激免疫应答效应，又能特异性地抑制肿瘤细胞生长，抑制肿瘤血管形成，诱导肿瘤细胞凋亡。目的：分析hIL-24对瘢痕疙瘩成纤维细胞的抑制增殖和诱导凋亡的作用及机制。方法：经临床及病理确诊为瘢痕疙瘩13例，取瘢痕疙瘩组织进行成纤维细胞培养和鉴定。实验分为对照组(瘢痕疙瘩组织成纤维细胞)和转染hIL-24的瘢痕疙瘩成纤维细胞组。构建慢病毒载体(LVTHM)将hIL-24基因转染瘢痕疙瘩组织成纤维细胞，观察转化生长因子β、Smad3、增殖细胞核抗原、基质金属蛋白酶2、基质金属蛋白酶9、基质金属蛋白酶抑制物1基因表达情况。结果与结论：①细胞免疫荧光染色及细胞流式显示培养的成纤维细胞内胞浆波形蛋白抗体呈阳性，纯度大于97.8%；定量PCR检测成纤维细胞hIL-24的过表达效率为81.7%；②Western blot检测转梁的成纤维细胞表达hIL-24明显增加；③定量PCR检测，对照组转化生长因子β、Smad3、增殖细胞核抗原、基质金属蛋白酶2、基质金属蛋白酶9表达明显高于转染hIL-24的瘢痕疙瘩成纤维细胞组(P<0.05)，基质金属蛋白酶抑制物1表达明显低于转染hIL-24的瘢痕疙瘩成纤维细胞组；④结果提示，hIL-24抑制成纤维细胞增殖细胞核抗原、基质金属蛋白酶2、基质金属蛋白酶9表达，其作用机制可能是通过转化生长因子β/Smad3转导途径。
展开▼
