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Indoxyl sulfate promotes vascular smooth muscle cell calcification via the JNK/Pit-1 pathway.

Ren Fail. 2016 Nov;38(10):1702-1710. doi:10.3109/0886022X.2016.1155397. Epub 2016 Mar 22
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摘要


We determined the effect of indoxyl sulfate (IS) on Pit-1 expression and the role of Pit-1 in IS-induced osteoblastic differentiation and calcification of vascular smooth muscle cells (VSMCs). To assess osteoblastic differentiation and Pit-1 expression, VSMCs were incubated with various concentrations of IS for different durations. Phosphonoformic acid (PFA), a competitive inhibitor of Pit-1, was used to verify the role of Pit-1. Western blot analysis and quantitative real-time polymerase chain reaction (PCR) were performed to assess Pit-1 protein and mRNA levels, respectively. To evaluate calcification, calcium content was measured. After IS treatment, we observed osteoblastic differentiation and calcification of VSMCs and up-regulation of Pit-1 expression. Moreover, the effect of IS on osteoblastic differentiation and Pit-1 expression was partly dose- and time-dependent. PFA abrogated the IS-induced osteoblastic differentiation and calcification of VSMCs to a certain extent. The c-Jun N-terminal kinase (JNK) pathway was activated after treatment with IS, whereas inhibition of the JNK pathway partially attenuated the effect of IS on both the stimulation of Pit-1 expression and calcium deposition. Our study is the first to demonstrate that IS promotes Pit-1 expression in part by activation of the JNK pathway that is involved in the mechanism of IS-induced osteoblastic differentiation and matrix mineralization.

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