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Liao P, Wang W, Li Y, Wang R, Jin J, Pang W, Chen Y, Shen M, Wang X, Jiang D, Pang J, Liu M, Lin X, Feng XH, Wang P, Ge X. Palmitoylated SCP1 is targeted to the plasma membrane and negatively regulates angiogenesis. eLife 2017; 6:e22058. [PMID: 28440748 PMCID: PMC5404917 DOI: 10.7554/elife.22058] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 03/25/2017] [Indexed: 12/12/2022] Open
Abstract
SCP1 as a nuclear transcriptional regulator acts globally to silence neuronal genes and to affect the dephosphorylation of RNA Pol ll. However, we report the first finding and description of SCP1 as a plasma membrane-localized protein in various cancer cells using EGFP- or other epitope-fused SCP1. Membrane-located SCP1 dephosphorylates AKT at serine 473, leading to the abolishment of serine 473 phosphorylation that results in suppressed angiogenesis and a decreased risk of tumorigenesis. Consistently, we observed increased AKT phosphorylation and angiogenesis followed by enhanced tumorigenesis in Ctdsp1 (which encodes SCP1) gene - knockout mice. Importantly, we discovered that the membrane localization of SCP1 is crucial for impeding angiogenesis and tumor growth, and this localization depends on palmitoylation of a conserved cysteine motif within its NH2 terminus. Thus, our study discovers a novel mechanism underlying SCP1 shuttling between the plasma membrane and nucleus, which constitutes a unique pathway in transducing AKT signaling that is closely linked to angiogenesis and tumorigenesis.
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Affiliation(s)
- Peng Liao
- Department of Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Weichao Wang
- Department of Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Yu Li
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Rui Wang
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Jiali Jin
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Weijuan Pang
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Yunfei Chen
- Department of Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Mingyue Shen
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Xinbo Wang
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Dongyang Jiang
- Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jinjiang Pang
- Department of Cardiology, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Mingyao Liu
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
| | - Xia Lin
- Department of Surgery, Baylor College of Medicine, Houston, United States
| | - Xin-Hua Feng
- Life Sciences Institute and Innovation Center for Cell Signaling Network, Zhejiang University, Zhejiang, China
| | - Ping Wang
- Department of Central Laboratory, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
- Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China
- School of Life Science and Technology, Tongji University, Shanghai, China
| | - Xin Ge
- Department of Clinical Laboratory Medicine, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
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