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Identification of a Mitochondrial Target of Thiazolidinedione Insulin Sensitizers (mTOT)—Relationship to Newly Identified Mitochondrial Pyruvate Carrier Proteins
Open accessAbstract
Thiazolidinedione (TZD) insulin sensitizers have the potential to effectively treat a number of human diseases, however the currently available agents have dose-limiting side effects that are mediated via activation of the transcription factor PPARγ. We have recently shown PPARγ-independent actions of TZD insulin sensitizers, but the molecular target of these molecules remained to be identified. Here we use a photo-catalyzable drug analog probe and mass spectrometry-based proteomics to identify a previously uncharacterized mitochondrial complex that specifically recognizes TZDs. These studies identify two well-conserved proteins previously known as brain protein 44 (BRP44) and BRP44 Like (BRP44L), which recently have been renamed Mpc2 and Mpc1 to signify their function as a mitochondrial pyruvate carrier complex. Knockdown of Mpc1 or Mpc2 in Drosophila melanogaster or pre-incubation with UK5099, an inhibitor of pyruvate transport, blocks the crosslinking of mitochondrial membranes by the TZD probe. Knockdown of these proteins in Drosophila also led to increased hemolymph glucose and blocked drug action. In isolated brown adipose tissue (BAT) cells, MSDC-0602, a PPARγ-sparing TZD, altered the incorporation of (13)C-labeled carbon from glucose into acetyl CoA. These results identify Mpc1 and Mpc2 as components of the mitochondrial target of TZDs (mTOT) and suggest that understanding the modulation of this complex, which appears to regulate pyruvate entry into the mitochondria, may provide a viable target for insulin sensitizing pharmacology.
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“In fact, the MPC has emerged as an unanticipated target of thiazolidinediones (Colca et al., 2013; Divakaruni et al., 2013), a class of insulin sensitizing drugs, and as a regulator of insulin secretion (Patterson et al., 2014; Vigueira et al., 2014);”
From Regulation of Substrate Utilization by the Mitochondrial Pyruvate Carrier (2014) · cites this paper as Colca et al., 2013
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Metadata
- Authors
- Colca, J. R., McDonald, W. G., Cavey, G. S., Cole, S. L., Holewa, D. D., Brightwell-Conrad, A. S., Wolfe, C. L., Wheeler, J. S., Coulter, K. R., Kilkuskie, P. M., Gracheva, E., Korshunova, Y., Trusgnich, M., Karr, R., Wiley, S. E., Divakaruni, A. S., Murphy, A. N., Vigueira, P. A., Finck, B. N., & Kletzien, R. F.
- Affiliations
- Metabolic Solutions Development Company (United States) (US)
- University of California San Diego (US)
- Washington University in St. Louis (US)
- Corresponding author
- Colca, Jerry R.
- ORCID
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2013-05-15
- Volume
- 8
- Issue
- 5
- Pages
- e61551
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC3655167
- OpenAlex
- W2165311378
- Cited by
- 171
- References
- 30
- Citations by year
- 2026: 6 · 2025: 4 · 2024: 9 · 2023: 12 · 2022: 14 · 2021: 12 · 2020: 14 · 2019: 13 · 2018: 15 · 2017: 20 · 2016: 17 · 2015: 8 · 2014: 17 · 2013: 9
- FWCI
- 7.61
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Digital Commons@Becker (Washington University School of Medicine) (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- eScholarship (California Digital Library) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion, cc-by)
- Funders
- Michigan Economic Development Corporation
- National Institutes of Health
- National Institute on Alcohol Abuse and Alcoholism (AA21228, R42AA021228)
- National Institute of Diabetes and Digestive and Kidney Diseases (R41DK084596, DK081298, DK84596, R42DK081298)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Peroxisome Proliferator-Activated Receptors
- Keywords
- thiazolidinediones, insulin sensitizers, mitochondrial pyruvate carrier, MPC1, MPC2, pyruvate transport, acetyl-CoA biosynthesis, brown adipose tissue, hemolymph glucose, Drosophila melanogaster, drug target identification
- MeSH terms
- Insulin Secretion, Amino Acid Sequence, Animals, Adipose Tissue, Brown, Drosophila melanogaster, Humans, Hypoglycemic Agents, Insulin, Mitochondria, Molecular Sequence Data, Sequence Homology, Amino Acid, Membrane Transport Proteins, Monocarboxylic Acid Transporters, Mitochondrial Membrane Transport Proteins, Thiazolidinediones, Gene Knockdown Techniques, HEK293 Cells
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