Liver serine palmitoyltransferase activity deficiency in early life impairs adherens junctions and promotes tumorigenesis.

Liver serine palmitoyltransferase activity deficiency in early life impairs adherens junctions and promotes tumorigenesis.
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DOI:
10.1002/hep.28845
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发表时间:
2016-12
期刊:
影响因子:
13.5
通讯作者:
Jiang, Xian-Cheng
Jiang, Xian-Cheng
中科院分区:
医学1区
文献类型:
--
作者:
Li, Zhiqiang;Kabir, Inamul;Jiang, Hui;Zhou, Hongwen;Libien, Jenny;Zeng, Jianying;Stanek, Albert;Ou, Peiqi;Li, Kailyn R.;Zhang, Shane;Bui, Hai H.;Kuo, Ming-Shang;Park, Tae-Sik;Kim, Benjamin;Worgall, Tilla S.;Huan, Chongmin;Jiang, Xian-Cheng

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Serine palmitoyltransferase (SPT) is the key enzyme in sphingolipid biosynthesis. Mice lacking SPT are embryonic lethal. We prepared liver-specific Sptlc2 deficient mice using an albumin-Cre approach, we found that the deficient mice have severe jaundice. Moreover, the deficiency impairs hepatocyte polarity, attenuates liver regeneration after hepatectomy, and promotes tumorigenesis. Importantly, we show that the deficiency significantly reduces sphingomyelin but not other sphingolipids in hepatocyte plasma membrane, greatly reduces cadherin, the major protein in adherens junctions, on the membrane and greatly induces cadherin phosphorylation, an indication for its degradation. The deficiency affects cellular distribution of β-catenin, the central component of the canonical Wnt pathway. Furthermore, such a defect can be partially corrected by sphingomyelin supplementation in vivo and in vitro. Our results, for the first time, show that plasma membrane sphingomyelin level is one of the key factors in regulating hepatocyte polarity and tumorigenesis.
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