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Dual Function of PI(4,5)P2 in Insulin-Regulated Exocytic Trafficking of GLUT4 in Adipocytes. J Mol Biol 2020; 432:4341-4357. [DOI: 10.1016/j.jmb.2020.06.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2019] [Revised: 06/15/2020] [Accepted: 06/18/2020] [Indexed: 11/17/2022]
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Proximity proteomics identifies novel function of Rab14 in trafficking of Ebola virus matrix protein VP40. Biochem Biophys Res Commun 2020; 527:387-392. [PMID: 32327259 DOI: 10.1016/j.bbrc.2020.04.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Accepted: 04/10/2020] [Indexed: 01/07/2023]
Abstract
Ebola virus is a member of Filoviridae family of viruses that causes fetal hemorrhagic fever in human. Matrix protein VP40 of the Ebola virus is involved in multiple stages of viral maturation processes. In order to fully understand the interacting partners of VP40 in host cells, we applied proximity-dependent biotin-identification (BioID) approach to systematically screen for potential proteins at different time points of VP40 expression. By immunoprecipitation and subsequent proteomics analysis, we found over 100 candidate proteins with various cellular components and molecular functions. Among them, we identified Rab14 GTPase that appears to function at the late stage of VP40 expression. Imaging studies demonstrated that VP40 and Rab14 have substantial colocalization when expressed in HeLa cells. Overexpression of the dominant-negative Rab14(S25N) diminished the plasma membrane (PM) localization of VP40. In addition, we found that secreted VP40 protein can be endocytosed into Rab14 positive compartments. In summary, our study provides evidence that Rab14 is a novel regulator of the intracellular trafficking of Ebola virus matrix protein VP40 in HeLa cells.
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Qian X, Zhou X, Shentu P, Yao Y, Jiao D, Chen Q, Zhou J, Xu Y. Sec3 knockdown inhibits TGF-β induced epithelial-mesenchymal transition through the down-regulation of Akt phosphorylation in A549 cells. Biochem Biophys Res Commun 2019; 519:253-260. [PMID: 31495494 DOI: 10.1016/j.bbrc.2019.08.145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Accepted: 08/26/2019] [Indexed: 11/17/2022]
Abstract
The exocyst, an evolutionarily conserved octomeric protein complex, has been demonstrated as an essential component for vesicle tethering during cell exocytosis, and participates in various physiological processes in the cell. Although subunits of the exocyst complex have been reported to be involved in the regulation of TGF-β induced cancer cell migration and epithelial-mesenchymal transition (EMT), the potential function of Sec3 in these regulated processes remains unclear. Here, we show that Sec3 knockdown abolishes TGF-β stimulated A549 lung cancer cell migration in vitro and causes defects in the regulated EMT process. In addition, we find that depletion of Sec3 significantly inhibits TGF-β stimulated Akt phosphorylation in A549 cells, whereas the increase of Smad2 phosphorylation is unaffected. Furthermore, replenishment of an RNAi-resistant form of Sec3 is shown to restore the defects of TGF-β induced cell migration, EMT and Akt signaling activation. In summary, our study provides evidence that Sec3 is involved in TGF-β induced cell migration and EMT processes, presumably through the regulation of PI3K/Akt signaling activation in A549 cancer cells.
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Affiliation(s)
- Xiaohan Qian
- Department of Biomedical Engineering, Key Laboratory of Biomedical Engineering of Ministry of Education, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou, 310027, China; Department of Respiratory Disease, Thoracic Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310003, China
| | - Xiaoxu Zhou
- Department of Biomedical Engineering, Key Laboratory of Biomedical Engineering of Ministry of Education, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou, 310027, China
| | - Ping Shentu
- Department of Biomedical Engineering, Key Laboratory of Biomedical Engineering of Ministry of Education, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou, 310027, China
| | - Yuanfa Yao
- Department of Biomedical Engineering, Key Laboratory of Biomedical Engineering of Ministry of Education, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou, 310027, China
| | - Demin Jiao
- Department of Respiratory Oncology, The 903rd Hospital of PLA, Hangzhou, 310013, China
| | - Qingyong Chen
- Department of Respiratory Oncology, The 903rd Hospital of PLA, Hangzhou, 310013, China
| | - Jianying Zhou
- Department of Respiratory Disease, Thoracic Disease Center, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou, 310003, China
| | - Yingke Xu
- Department of Biomedical Engineering, Key Laboratory of Biomedical Engineering of Ministry of Education, Zhejiang Provincial Key Laboratory of Cardio-Cerebral Vascular Detection Technology and Medicinal Effectiveness Appraisal, Zhejiang University, Hangzhou, 310027, China; Department of Endocrinology, The Affiliated Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, 310016, China.
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Lanning NJ, VanOpstall C, Goodall ML, MacKeigan JP, Looyenga BD. LRRK2 deficiency impairs trans-Golgi to lysosome trafficking and endocytic cargo degradation in human renal proximal tubule epithelial cells. Am J Physiol Renal Physiol 2018; 315:F1465-F1477. [PMID: 30089035 DOI: 10.1152/ajprenal.00009.2018] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Defects in vesicular trafficking underlie a wide variety of human diseases. Genetic disruption of leucine-rich repeat kinase 2 (LRRK2) in rodents results in epithelial vesicular trafficking errors that can also be induced by treatment of animals with LRRK2 kinase inhibitors. Here we demonstrate that defects in human renal cells lacking LRRK2 phenocopy those seen in the kidneys of Lrrk2 knockout mice, characterized by accumulation of intracellular waste vesicles and fragmentation of the Golgi apparatus. This phenotype can be recapitulated by knockdown of N-ethylmaleimide-sensitive factor, which physically associates with LRRK2 in renal cells. Deficiency in either protein leads to a defect in trans-Golgi to lysosome protein trafficking, which compromises the capacity of lysosomes to degrade endocytic and autophagic cargo. In contrast, neither bulk endocytosis nor autophagic flux are impaired when LRRK2 is acutely knocked down in normal immortalized human kidney (HK2) cells. These data collectively suggest that the primary renal defect caused by LRRK2 deficiency is in protein trafficking between the Golgi apparatus and late endosome/lysosome, which leads to progressive impairments in lysosomal function.
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Affiliation(s)
- Nathan J Lanning
- Van Andel Research Institute, Lab of Systems Biology , Grand Rapids, Michigan
| | - Calvin VanOpstall
- Calvin College, Department of Chemistry and Biochemistry , Grand Rapids, Michigan
| | - Megan L Goodall
- Van Andel Research Institute, Lab of Systems Biology , Grand Rapids, Michigan
| | - Jeffrey P MacKeigan
- Van Andel Research Institute, Lab of Systems Biology , Grand Rapids, Michigan
| | - Brendan D Looyenga
- Van Andel Research Institute, Lab of Systems Biology , Grand Rapids, Michigan.,Calvin College, Department of Chemistry and Biochemistry , Grand Rapids, Michigan
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