Inhibition of intimal hyperplasia in murine aortic allografts by the oral administration of the transforming growth factor-beta receptor I kinase inhibitor SD-208

详细信息    查看全文

• 作者：Yuan Sun ; PhD^a ; Ping Ye ; PhD^b ; Jie Wu ; PhD^a ; Zheng Liu ; PhD^a ; Anchen Zhang ; PhD^a ; Linyun Ren ; PhD^a ; Chao Cheng ; PhD^a ; Xiaofan Huang ; PhD^a ; Ke Wang ; PhD^a ; Peng Deng ; PhD^a ; Chuangyan Wu ; PhD^a ; Zhang Yue ; PhD^a ; Jiahong Xia ; PhD ; MD^a ; ^c ; ^{jiahong.xia@mail.hust.edu.cn" class="auth_mail}
• 关键词：TGF-尾 ; intimal hyperplasia ; transplant arteriosclerosis ; TGF-尾 receptor I kinase inhibitor ; Smad3 ; connective tissue growth factor ; smooth muscle-like cell
• 刊名：The Journal of Heart and Lung Transplantation
• 出版年：June 2014
• 年：2014
• 卷：33
• 期：6
• 页码：654-661
• 全文大小：3895 K

文摘

Transforming growth factor-beta (TGF-尾) plays a significant role in the pathogenesis of the intimal hyperplasia of transplant arteriosclerosis (TA). The aim of this study was to evaluate the efficacy of an oral inhibitor of TGF-尾 receptor I kinase (SD-208) on the development of TA.

Methods

BALB/c (H-2^d) donor aortas were transplanted into C57BL/6 (H-2^b) recipients, and the mice then received different doses (40 or 60 mg/kg) of SD-208 or control vehicle by daily gavage for 8 weeks. The grafts were analyzed by histology and morphometry at 1, 2, 4, 6 and 8 weeks after transplantation. The effects of TGF-尾 and SD-208 on neointimal smooth muscle-like cell (SMLC) and vascular smooth muscle cell (VSMC) proliferation and migration were evaluated, and the expression levels of Smad3, P-Smad3, connective tissue growth factor (CTGF) and collagen I were determined by in vitro experiments.

Results

The intimal hyperplasia of the SD-208–treated group was significantly reduced compared with the vehicle-treated control group (32% and 48% reduction for 40 mg/kg and 60 mg/kg SD-208 compared with the controls, respectively [n = 5], p < 0.05). SD-208 reduced SMLC proliferation and the production of intimal collagen by 21% and 75%, respectively, in the grafts. SD-208 also abolished the promoting effect of TGF-尾 on SMLC proliferation and migration but did not affect TGF-尾 inhibition of VSMCs in vitro. CTGF, a protein downstream of TGF-尾, was downregulated with the inhibition of Smad3 phosphorylation by SD-208, both in vitro and in vivo. Moreover, we found that the endogenous Smad3 in SMLCs was upregulated from 2 weeks after transplantation and was 64% higher than in VSMCs at 8 weeks.

Conclusion

These results demonstrate that SD-208 can effectively reduce the formation of intimal hyperplasia of TA in the murine aortic allograft model.