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Gong Z, Tasset I, Diaz A, Anguiano J, Tas E, Cui L, Kuliawat R, Liu H, Kühn B, Cuervo AM, Muzumdar R. Humanin is an endogenous activator of chaperone-mediated autophagy. J Cell Biol 2017; 217:635-647. [PMID: 29187525 PMCID: PMC5800795 DOI: 10.1083/jcb.201606095] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 10/11/2017] [Accepted: 11/06/2017] [Indexed: 12/16/2022] Open
Abstract
Gong et al. show in multiple cell types that a mitochondrial-associate peptide, humanin, activates chaperone-mediated autophagy (CMA) by stabilizing the interaction between HSP90 and CMA substrates, thereby protecting cells from stressor-induced cell death. Chaperone-mediated autophagy (CMA) serves as quality control during stress conditions through selective degradation of cytosolic proteins in lysosomes. Humanin (HN) is a mitochondria-associated peptide that offers cytoprotective, cardioprotective, and neuroprotective effects in vivo and in vitro. In this study, we demonstrate that HN directly activates CMA by increasing substrate binding and translocation into lysosomes. The potent HN analogue HNG protects from stressor-induced cell death in fibroblasts, cardiomyoblasts, neuronal cells, and primary cardiomyocytes. The protective effects are lost in CMA-deficient cells, suggesting that they are mediated through the activation of CMA. We identified that a fraction of endogenous HN is present at the cytosolic side of the lysosomal membrane, where it interacts with heat shock protein 90 (HSP90) and stabilizes binding of this chaperone to CMA substrates as they bind to the membrane. Inhibition of HSP90 blocks the effect of HNG on substrate translocation and abolishes the cytoprotective effects. Our study provides a novel mechanism by which HN exerts its cardioprotective and neuroprotective effects.
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Affiliation(s)
- Zhenwei Gong
- Department of Pediatrics, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Inmaculada Tasset
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY.,Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY
| | - Antonio Diaz
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY.,Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY
| | - Jaime Anguiano
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY.,Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY
| | - Emir Tas
- Department of Pediatrics, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Lingguang Cui
- Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY
| | - Regina Kuliawat
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY.,Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY
| | - Honghai Liu
- Department of Pediatrics, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA.,Richard King Mellon Foundation Institute for Pediatric Research, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA.,Division of Cardiology, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Bernhard Kühn
- Department of Pediatrics, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA.,Richard King Mellon Foundation Institute for Pediatric Research, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA.,Division of Cardiology, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA.,McGowan Institute of Regenerative Medicine, Pittsburgh, PA
| | - Ana Maria Cuervo
- Department of Developmental and Molecular Biology, Albert Einstein College of Medicine, Bronx, NY .,Institute for Aging Studies, Albert Einstein College of Medicine, Bronx, NY
| | - Radhika Muzumdar
- Department of Pediatrics, Children's Hospital of Pittsburgh of University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine, Pittsburgh, PA
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Maximov VV, Martynenko AV, Arman IP, Tarantul VZ. Humanin binds MPP8: mapping interaction sites of the peptide and protein. J Pept Sci 2013; 19:301-7. [PMID: 23532874 DOI: 10.1002/psc.2500] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 01/30/2013] [Accepted: 01/31/2013] [Indexed: 11/11/2022]
Abstract
Humanin (HN), a 24-amino acid peptide encoded by the mitochondrial 16S rRNA gene, was discovered by screening a cDNA library from the occipital cortex of a patient with Alzheimer's disease (AD) for a protection factor against AD-relevant insults. Earlier, using the yeast two-hybrid system, we have identified the M-phase phosphoprotein 8 (MPP8) as a binding partner for HN. In the present work, we further confirmed interaction of HN with MPP8 in co-immunoprecipitation experiments and localized an MPP8-binding site in the region between 5 and 12 aa. of HN. We have also shown that an MPP8 fragment (residues 431-560) is sufficient to bind HN. Further studies on functional consequences of the interaction between the potential oncopetide and the oncoprotein may elucidate some aspects of the molecular mechanisms of carcinogenesis.
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Affiliation(s)
- Vadim V Maximov
- Institute of Molecular Genetics, Russian Academy of Sciences, Moscow, Russia
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