Ncor2/PPARα-Dependent Upregulation of MCUb in the Type 2 Diabetic Heart Impacts Cardiac Metabolic Flexibility and Function
© 2020 by the American Diabetes Association..
The contribution of altered mitochondrial Ca2+ handling to metabolic and functional defects in type 2 diabetic (T2D) mouse hearts is not well understood. In this study, we show that the T2D heart is metabolically inflexible and almost exclusively dependent on mitochondrial fatty acid oxidation as a consequence of mitochondrial calcium uniporter complex (MCUC) inhibitory subunit MCUb overexpression. Using a recombinant endonuclease-deficient Cas9-based gene promoter pulldown approach coupled with mass spectrometry, we found that MCUb is upregulated in the T2D heart due to loss of glucose homeostasis regulator nuclear receptor corepressor 2 repression, and chromatin immunoprecipitation assays identified peroxisome proliferator-activated receptor α as a mediator of MCUb gene expression in T2D cardiomyocytes. Upregulation of MCUb limits mitochondrial matrix Ca2+ uptake and impairs mitochondrial energy production via glucose oxidation by depressing pyruvate dehydrogenase complex activity. Gene therapy displacement of endogenous MCUb with a dominant-negative MCUb transgene (MCUbW246R/V251E) in vivo rescued T2D cardiomyocytes from metabolic inflexibility and stimulated cardiac contractile function and adrenergic responsiveness by enhancing phospholamban phosphorylation via protein kinase A. We conclude that MCUb represents one newly discovered molecular effector at the interface of metabolism and cardiac function, and its repression improves the outcome of the chronically stressed diabetic heart.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:70 |
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| Enthalten in: |
Diabetes - 70(2021), 3 vom: 10. März, Seite 665-679 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Cividini, Federico [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 24.09.2021 Date Revised 02.03.2022 published: Print-Electronic figshare: 10.2337/figshare.13342229 Citation Status MEDLINE |
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| doi: |
10.2337/db20-0779 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM318690470 |
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| 245 | 1 | 0 | |a Ncor2/PPARα-Dependent Upregulation of MCUb in the Type 2 Diabetic Heart Impacts Cardiac Metabolic Flexibility and Function |
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| 500 | |a figshare: 10.2337/figshare.13342229 | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2020 by the American Diabetes Association. | ||
| 520 | |a The contribution of altered mitochondrial Ca2+ handling to metabolic and functional defects in type 2 diabetic (T2D) mouse hearts is not well understood. In this study, we show that the T2D heart is metabolically inflexible and almost exclusively dependent on mitochondrial fatty acid oxidation as a consequence of mitochondrial calcium uniporter complex (MCUC) inhibitory subunit MCUb overexpression. Using a recombinant endonuclease-deficient Cas9-based gene promoter pulldown approach coupled with mass spectrometry, we found that MCUb is upregulated in the T2D heart due to loss of glucose homeostasis regulator nuclear receptor corepressor 2 repression, and chromatin immunoprecipitation assays identified peroxisome proliferator-activated receptor α as a mediator of MCUb gene expression in T2D cardiomyocytes. Upregulation of MCUb limits mitochondrial matrix Ca2+ uptake and impairs mitochondrial energy production via glucose oxidation by depressing pyruvate dehydrogenase complex activity. Gene therapy displacement of endogenous MCUb with a dominant-negative MCUb transgene (MCUbW246R/V251E) in vivo rescued T2D cardiomyocytes from metabolic inflexibility and stimulated cardiac contractile function and adrenergic responsiveness by enhancing phospholamban phosphorylation via protein kinase A. We conclude that MCUb represents one newly discovered molecular effector at the interface of metabolism and cardiac function, and its repression improves the outcome of the chronically stressed diabetic heart | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, N.I.H., Extramural | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Research Support, U.S. Gov't, Non-P.H.S. | |
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| 650 | 7 | |a Membrane Proteins |2 NLM | |
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| 700 | 1 | |a Scott, Brian T |e verfasserin |4 aut | |
| 700 | 1 | |a Suarez, Jorge |e verfasserin |4 aut | |
| 700 | 1 | |a Casteel, Darren E |e verfasserin |4 aut | |
| 700 | 1 | |a Heinz, Sven |e verfasserin |4 aut | |
| 700 | 1 | |a Dai, Anzhi |e verfasserin |4 aut | |
| 700 | 1 | |a Diemer, Tanja |e verfasserin |4 aut | |
| 700 | 1 | |a Suarez, Jorge A |e verfasserin |4 aut | |
| 700 | 1 | |a Benner, Christopher W |e verfasserin |4 aut | |
| 700 | 1 | |a Ghassemian, Majid |e verfasserin |4 aut | |
| 700 | 1 | |a Dillmann, Wolfgang H |e verfasserin |4 aut | |
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