Manganese activates autophagy to alleviate endoplasmic reticulum stress–induced apoptosis via PERK pathway

Overexposure to manganese (Mn) is neurotoxic. Our previous research has demonstrated that the interaction of endoplasmic reticulum (ER) stress and autophagy participates in the early stage of Mn‐mediated neurotoxicity in mouse. However, the mechanisms of ER stress signalling pathways in the initiati...

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Veröffentlicht in:Journal of cellular and molecular medicine 2020-01, Vol.24 (1), p.328-341
Hauptverfasser: Liu, Chang, Yan, Dong‐Ying, Wang, Can, Ma, Zhuo, Deng, Yu, Liu, Wei, Xu, Bin
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creator Liu, Chang
Yan, Dong‐Ying
Wang, Can
Ma, Zhuo
Deng, Yu
Liu, Wei
Xu, Bin
description Overexposure to manganese (Mn) is neurotoxic. Our previous research has demonstrated that the interaction of endoplasmic reticulum (ER) stress and autophagy participates in the early stage of Mn‐mediated neurotoxicity in mouse. However, the mechanisms of ER stress signalling pathways in the initiation of autophagy remain confused. In the current study, we first validated that ER stress–mediated cell apoptosis is accompanied by autophagy in SH‐SY5Y cells. Then, we found that inhibiting ER stress with 4‐phenylbutyrate (4‐PBA) decreased ER stress–related protein expression and reduced cell apoptosis, whereas blocking autophagy with 3‐methyladenine (3‐MA) increased cell apoptosis. These data indicate that protective autophagy was activated to alleviate ER stress–mediated apoptosis. Knockdown of the protein kinase RNA‐like ER kinase (PERK) gene inhibited Mn‐induced autophagy and weakened the interaction between ATF4 and the LC3 promoter. Our results reveal a novel molecular mechanism in which ER stress may regulate autophagy via the PERK/eIF2α/ATF4 signalling pathway. Additionally, Mn may activate protective autophagy to alleviate ER stress–mediated apoptosis via the PERK/eIF2α/ATF4 signalling pathway in SH‐SY5Y cells.
doi_str_mv 10.1111/jcmm.14732
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Our previous research has demonstrated that the interaction of endoplasmic reticulum (ER) stress and autophagy participates in the early stage of Mn‐mediated neurotoxicity in mouse. However, the mechanisms of ER stress signalling pathways in the initiation of autophagy remain confused. In the current study, we first validated that ER stress–mediated cell apoptosis is accompanied by autophagy in SH‐SY5Y cells. Then, we found that inhibiting ER stress with 4‐phenylbutyrate (4‐PBA) decreased ER stress–related protein expression and reduced cell apoptosis, whereas blocking autophagy with 3‐methyladenine (3‐MA) increased cell apoptosis. These data indicate that protective autophagy was activated to alleviate ER stress–mediated apoptosis. Knockdown of the protein kinase RNA‐like ER kinase (PERK) gene inhibited Mn‐induced autophagy and weakened the interaction between ATF4 and the LC3 promoter. Our results reveal a novel molecular mechanism in which ER stress may regulate autophagy via the PERK/eIF2α/ATF4 signalling pathway. Additionally, Mn may activate protective autophagy to alleviate ER stress–mediated apoptosis via the PERK/eIF2α/ATF4 signalling pathway in SH‐SY5Y cells.</description><identifier>ISSN: 1582-1838</identifier><identifier>EISSN: 1582-4934</identifier><identifier>DOI: 10.1111/jcmm.14732</identifier><identifier>PMID: 31639278</identifier><language>eng</language><publisher>England: John Wiley &amp; Sons, Inc</publisher><subject>Activating Transcription Factor 4 - metabolism ; Apoptosis ; Apoptosis - drug effects ; Autophagy ; Autophagy - drug effects ; Cell Line, Tumor ; Cytotoxicity ; eIF-2 Kinase - metabolism ; Endoplasmic reticulum ; endoplasmic reticulum stress ; Endoplasmic Reticulum Stress - drug effects ; Enzymes ; Flow cytometry ; Gene expression ; Gene Knockdown Techniques ; Homeostasis ; Humans ; Kinases ; Manganese ; Manganese - pharmacology ; Microtubule-Associated Proteins - genetics ; Neurotoxicity ; Original ; PERK signalling pathway ; Phagocytosis ; Phenylbutyric acid ; Promoter Regions, Genetic - genetics ; Protein kinase ; Proteins ; Reagents ; Ribonucleic acid ; RNA ; Signal transduction ; Signal Transduction - drug effects ; Stress</subject><ispartof>Journal of cellular and molecular medicine, 2020-01, Vol.24 (1), p.328-341</ispartof><rights>2019 The Authors. published by Foundation for Cellular and Molecular Medicine and John Wiley &amp; Sons Ltd</rights><rights>2019 The Authors. Journal of Cellular and Molecular Medicine published by Foundation for Cellular and Molecular Medicine and John Wiley &amp; Sons Ltd.</rights><rights>2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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Our previous research has demonstrated that the interaction of endoplasmic reticulum (ER) stress and autophagy participates in the early stage of Mn‐mediated neurotoxicity in mouse. However, the mechanisms of ER stress signalling pathways in the initiation of autophagy remain confused. In the current study, we first validated that ER stress–mediated cell apoptosis is accompanied by autophagy in SH‐SY5Y cells. Then, we found that inhibiting ER stress with 4‐phenylbutyrate (4‐PBA) decreased ER stress–related protein expression and reduced cell apoptosis, whereas blocking autophagy with 3‐methyladenine (3‐MA) increased cell apoptosis. These data indicate that protective autophagy was activated to alleviate ER stress–mediated apoptosis. Knockdown of the protein kinase RNA‐like ER kinase (PERK) gene inhibited Mn‐induced autophagy and weakened the interaction between ATF4 and the LC3 promoter. Our results reveal a novel molecular mechanism in which ER stress may regulate autophagy via the PERK/eIF2α/ATF4 signalling pathway. 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Our previous research has demonstrated that the interaction of endoplasmic reticulum (ER) stress and autophagy participates in the early stage of Mn‐mediated neurotoxicity in mouse. However, the mechanisms of ER stress signalling pathways in the initiation of autophagy remain confused. In the current study, we first validated that ER stress–mediated cell apoptosis is accompanied by autophagy in SH‐SY5Y cells. Then, we found that inhibiting ER stress with 4‐phenylbutyrate (4‐PBA) decreased ER stress–related protein expression and reduced cell apoptosis, whereas blocking autophagy with 3‐methyladenine (3‐MA) increased cell apoptosis. These data indicate that protective autophagy was activated to alleviate ER stress–mediated apoptosis. Knockdown of the protein kinase RNA‐like ER kinase (PERK) gene inhibited Mn‐induced autophagy and weakened the interaction between ATF4 and the LC3 promoter. Our results reveal a novel molecular mechanism in which ER stress may regulate autophagy via the PERK/eIF2α/ATF4 signalling pathway. Additionally, Mn may activate protective autophagy to alleviate ER stress–mediated apoptosis via the PERK/eIF2α/ATF4 signalling pathway in SH‐SY5Y cells.</abstract><cop>England</cop><pub>John Wiley &amp; Sons, Inc</pub><pmid>31639278</pmid><doi>10.1111/jcmm.14732</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0001-8024-2066</orcidid><oa>free_for_read</oa></addata></record>
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subjects Activating Transcription Factor 4 - metabolism
Apoptosis
Apoptosis - drug effects
Autophagy
Autophagy - drug effects
Cell Line, Tumor
Cytotoxicity
eIF-2 Kinase - metabolism
Endoplasmic reticulum
endoplasmic reticulum stress
Endoplasmic Reticulum Stress - drug effects
Enzymes
Flow cytometry
Gene expression
Gene Knockdown Techniques
Homeostasis
Humans
Kinases
Manganese
Manganese - pharmacology
Microtubule-Associated Proteins - genetics
Neurotoxicity
Original
PERK signalling pathway
Phagocytosis
Phenylbutyric acid
Promoter Regions, Genetic - genetics
Protein kinase
Proteins
Reagents
Ribonucleic acid
RNA
Signal transduction
Signal Transduction - drug effects
Stress
title Manganese activates autophagy to alleviate endoplasmic reticulum stress–induced apoptosis via PERK pathway
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