Cited by 320Endoplasmic Reticulum Stress and DiseasePharmacological Receptor Mechanisms and EffectsIon Channels and Receptors

Sigma-1 receptor chaperone at the ER-mitochondrion interface mediates the mitochondrion-ER-nucleus signaling for cellular survival.

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Mori, Tomohisa, Hayashi, Teruo, Hayashi, Eri, Su, Tsung-Ping·2013·PLoS ONE

Abstract

The membrane of the endoplasmic reticulum (ER) of a cell forms contacts directly with mitochondria whereby the contact is referred to as the mitochondrion-associated ER membrane or the MAM. Here we found that the MAM regulates cellular survival via an MAM-residing ER chaperone the sigma-1 receptor (Sig-1R) in that the Sig-1R chaperones the ER stress sensor IRE1 to facilitate inter-organelle signaling for survival. IRE1 is found in this study to be enriched at the MAM in CHO cells. We found that IRE1 is stabilized at the MAM by Sig-1Rs when cells are under ER stress. Sig-1Rs stabilize IRE1 and thus allow for conformationally correct IRE1 to dimerize into the long-lasting, activated endonuclease. The IRE1 at the MAM also responds to reactive oxygen species derived from mitochondria. Therefore, the ER-mitochondrion interface serves as an important subcellular entity in the regulation of cellular survival by enhancing the stress-responding signaling between mitochondria, ER, and nucleus.

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Crossref · 10.1371/journal.pone.0076941

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  • Inside the cell, Sig-1R is located mainly at the ER-mitochondrion interface (MAM) and regulates cellular bioenergetics, particularly under stressful conditions.

    “Inside the cell Sig-1R is located mainly at the ER–mitochondrion interface—referred to as the MAM—and regulates cellular bioenergetics, particularly under stressful conditions (Su et al., 2010; Mori et al., 2013; Hayashi, 2015).”

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Authors
Mori, T., Hayashi, T., Hayashi, E., & Su, T.-P.
Affiliations
United States Department of Health and Human Services (US)
Corresponding author
Su, Tsung-Ping
Venue
PLoS ONE
Published
2013-10-18
Volume
8
Issue
10
Pages
e76941
ISSN
1932-6203 (ISSN-L)
OpenAlex
W1994289493
Cited by
317
References
51
Citations by year
2026: 22 · 2025: 24 · 2024: 20 · 2023: 29 · 2022: 26 · 2021: 38 · 2020: 33 · 2019: 34 · 2018: 18 · 2017: 29 · 2016: 16 · 2015: 10 · 2014: 17
FWCI
8.51
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, public-domain)
  • Europe PMC (PubMed Central) (publishedVersion, public-domain)
  • PubMed Central (publishedVersion, public-domain)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
Funders
  • U.S. Department of Health and Human Services
  • National Institutes of Health
  • National Institute on Drug Abuse
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pharmacological Receptor Mechanisms and Effects
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
Keywords
sigma-1 receptor, mitochondria-associated membranes, endoplasmic reticulum, IRE1, endoplasmic reticulum stress, mitochondrial reactive oxygen species, molecular chaperones, protein stabilization, endonuclease activation, cell survival
MeSH terms
Sigma-1 Receptor, Animals, Cell Nucleus, Cell Survival, Cricetulus, Endoplasmic Reticulum, Endoribonucleases, Cricetinae, HeLa Cells, Humans, Immunohistochemistry, Intracellular Membranes, Mitochondria, Mutation, Protein Binding, Blotting, Western, Signal Transduction, CHO Cells, Protein Serine-Threonine Kinases, Reactive Oxygen Species, Receptors, sigma, Microscopy, Confocal, Molecular Chaperones, RNA Interference, Cell Line, Tumor, Mice

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