Research Papers:
TGFBR-IDH1-Cav1 axis promotes TGF-β signalling in cancer-associated fibroblast
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Abstract
Xiaodan Hou1,3, Jieying Zhang1, Yongbin Wang1, Wujun Xiong2 and Jun Mi1
1Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai, China
2Shanghai East Hospital, Affiliated to Tongji University, Shanghai, China
3Center of Systems Medicine, Chinese Academy of Medical Sciences, Suzhou Institute of Systems Medicine, Suzhou, China
Correspondence to:
Jun Mi, email: [email protected]
Wujun Xiong, email: [email protected]
Keywords: IDH1, TGFBR, TGF-β signalling, Cav1, alpha-ketoglutarate
Received: July 28, 2017 Accepted: August 23, 2017 Published: September 13, 2017
ABSTRACT
TGF-β signalling plays an important role in fibroblasts activation and tumour progression. Here, we report that the TGFBR-IDH1-Cav1 axis promotes TGF- β signalling in fibroblasts. Our data demonstrated that IDH1 was downregulated by TGF-β signalling in fibroblasts, and downregulation of IDH1 increased cellular concentration of α-ketoglutarate (α-KG) by accelerating glutamine metabolization. Interestingly, α-KG suppressed Cav1 expression through reducing the trimethylation of histone H3K4. Furthermore, Cav1 downregulation inhibited TGFBR protein degradation. In turn, the activated TGFBR promoted TGF-β signalling. These findings demonstrated that metabolic enzyme IDH1 regulates TGF-β signalling by feedback mechanism through α-KG and TGFBR-IDH1-Cav1 axis is important for TGF-β signalling.
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