Cited by 117Mitochondrial Function and PathologyCardiac Ischemia and ReperfusionCytokine Signaling Pathways and Interactions

Cytoprotection by the modulation of mitochondrial electron transport chain: The emerging role of mitochondrial STAT3

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Szczepanek, Karol, Chen, Qun, Larner, Andrew C., Lesnefsky, Edward J.·2012·Mitochondrion

Abstract

The down regulation of mitochondrial electron transport is an emerging mechanism of cytoprotective intervention that is effective in pathologic settings such as myocardial ischemia and reperfusion when the continuation of mitochondrial respiration produces reactive oxygen species, mitochondrial calcium overload, and the release of cytochrome c to activate cell death programs. The initial target of deranged electron transport is the mitochondria themselves. In the first part of this review, we describe this concept and summarize different approaches used to regulate mitochondrial respiration by targeting complex I as a proximal site in the electron transport chain (ETC) in order to favor the cytoprotection. The second part of the review highlights the emerging role of signal transducer and activator of transcription 3 (STAT3) in the direct, non-transcriptional regulation of ETC, as an example of a genetic approach to modulate respiration. Recent studies indicate that a pool of STAT3 resides in the mitochondria where it is necessary for the maximal activity of complexes I and II of the electron transport chain (ETC). The overexpression of mitochondrial-targeted STAT3 results in a partial blockade of electron transport at complexes I and II that does not impair mitochondrial membrane potential nor enhance the production of reactive oxygen species (ROS). The targeting of transcriptionally-inactive STAT3 to mitochondria attenuates damage to mitochondria during cell stress, resulting in decreased production of ROS and retention of cytochrome c by mitochondria. The overexpression of STAT3 targeted to mitochondria unveils a novel protective approach mediated by modulation of mitochondrial respiration that is independent of STAT3 transcriptional activity. The limitation of mitochondrial respiration under pathologic circumstances can be approached by activation and overexpression of endogenous signaling mechanisms in addition to pharmacologic means. The regulation of mitochondrial respiration comprises a cardioprotective paradigm to decrease cellular injury during ischemia and reperfusion.

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Crossref · 10.1016/j.mito.2011.08.011

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  • pS-STAT3 optimizes mitochondrial respiration and limits ROS formation from complex I following cardiac ischemia.

    “Of note, pS-STAT3 optimizes mitochondrial respiration and limits ROS formation from complex I following cardiac ischemia (Szczepanek et al., 2012).”

    From Targeting Janus Kinases and Signal Transducer and Activator of Transcription 3 To Treat Inflammation, Fibrosis, and Cancer: Rationale, Progress, and Caution (2020) · cites this paper as Szczepanek et al., 2012

    Section 3.4 reports that mitochondria-targeted STAT3 modulates respiration and prevents the ischemia-induced rise in complex I–associated ROS; section 4 describes reduced ROS during ischemia. The passages do not establish that the STAT3 responsible is specifically serine-phosphorylated (pS-STAT3), and the reported ROS effect is during ischemia rather than specifically following it. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • STAT3 has a specific role in modulating mitochondrial function through mechanisms independent of its nuclear factor function but dependent on phosphorylation at a serine residue.

    “STAT3, initially characterized as a nuclear factor that regulates gene expression in response to IL-6 and other cytokines, has been recently found to have a specific role in modulating mitochondrial function through mechanisms independent of its function as a nuclear factor, but dependent on its phosphorylation at a serine residue (412, 445).”

    From Redox regulation of mitochondrial function (2012) · cites this paper as [412]

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Research works printed but not linked: 3

  1. Chen Q Lesnefsky E 2009b Mitochondria and cardiac injury: A journey from reperfusion to ischemia and back again BOOK CHAPTER The Research Signpost/Transworld Research Network
  2. Lesnefsky EJ Chen Q Moghaddas S Hassan MO Tandler B Hoppel CL 2004b Blockade of electron transport during Ischemia protects cardiac mitochondria J Biol Chem 279 47961 47967 15347666
  3. Lesnefsky EJ Moghaddas S Tandler B Kerner J Hoppel CL 2001d Mitochondrial dysfunction in cardiac disease: ischemia-reperfusion, aging, and heart failure J Mol Cell Cardiol 33 1065 1089 11444914

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Authors
Szczepanek, K., Chen, Q., Larner, A. C., & Lesnefsky, E. J.
Affiliations
  • Virginia Commonwealth University (US)
  • United States Department of Veterans Affairs (US)
Corresponding author
Lesnefsky, Edward J.
Venue
Mitochondrion
Publisher
Elsevier BV
Published
2012-03
Volume
12
Issue
2
Pages
180-189
ISSN
1567-7249 (ISSN-L)
OpenAlex
W1991845993
Cited by
117
References
141
Citations by year
2026: 2 · 2025: 1 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 5 · 2020: 10 · 2019: 13 · 2018: 7 · 2017: 5 · 2016: 7 · 2015: 13 · 2014: 17 · 2013: 10 · 2012: 11
FWCI
1.13
Type
journal article
Language
en
Open access
Locations
  • Mitochondrion (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIH
  • Office of Research and Development, Medical Research Service, Department of Veterans Affairs
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
Keywords
mitochondrial STAT3, mitochondrial electron transport chain, cytoprotection, mitochondrial respiration, complex I, complex II, myocardial ischemia-reperfusion injury, reactive oxygen species, mitochondrial calcium overload, cytochrome c release, cardioprotection
MeSH terms
Animals, Humans, Down-Regulation, Reactive Oxygen Species, Cytoprotection, Mitochondrial Proteins, Electron Transport Complex II, Electron Transport Complex I, STAT3 Transcription Factor

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