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Effect of transforming growth factor-β3 on hepatic and pancreatic fibrosis
Xia Zhou, Ke-Shu Xu
Xia Zhou, Ke-Shu Xu, Department of Digestive Disease, Union Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei Province, China
Correspondence to: Dr. Ke-Shu Xu, Department of Digestive Disease, Union Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei Province, China. xuzou@medmail.com.cn
Received: June 18, 2007 Revised: September 18, 2007 Accepted: September 28, 2007 Published online: October 8, 2007
Excessive deposition of extracellular matrix leading to tissue reconstruction is the basic characteristic of tissue fibrosis. Transforming growth factor (TGF)-β3 has an anti-fibrotic effect through inhibiting the deposition of collagen and promoting its decomposition. Furthermore, it has been shown that TGF-β3 can decrease scar formation during wound healing. We focused on the expression and effect of TGF-β3 in the course of hepatic and pancreatic fibrosis, then investigated the effect of TGF-β3 on fibrosis.
Li et al[39]运用基因敲除小鼠研究TGF-β3与致纤维化因子纤溶酶原激活物抑制剂-1(PAI-1)之间的关系, 敲除TGF-β3基因约15 d的小鼠表皮及真皮层PAI-1的表达增高, 此外在该小鼠真皮成纤维细胞的培养液中也发现PAI-1的表达及活性增高, 说明TGF-β3可能通过抑制促纤维化因子的表达而发挥抗纤维化作用. Liu et al[40]研究发现, Smad3和CREB-1是诱导TGF-β3最重要的转录因子, JNKs和p38是TGF-β3合成关键的上游调节因子. 高水平的TGF-V3可以通过DNA结合蛋白与启动子中含有3个重复TCCC序列的区域结合, 从而激活TGF-β3启动子. 这个序列的突变不仅可抑制蛋白与该区域的结合, 还明显降低启动子的活性[41]. Abdelaziz et al[42]研究显示, 一氧化氮(NO)可调节TGF-β3的表达, 培养的新生大鼠心脏成纤维细胞经S-亚硝基N-乙酰二甲基半胱氨酸盐酸盐(SNAP)处理4 h后, TGF-β3mRNA的表达水平明显下降; 而缺氧诱导因子-1可直接诱导TGF-β3转录, 促进其表达[43].
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