Abstract
The metabolic rewiring of cardiomyocytes is a widely accepted hallmark of heart failure (HF). These metabolic changes include a decrease in mitochondrial pyruvate oxidation and an increased export of lactate. We identify the mitochondrial pyruvate carrier (MPC) and the cellular lactate exporter monocarboxylate transporter 4 (MCT4) as pivotal nodes in this metabolic axis. We observed that cardiac assist device-induced myocardial recovery in chronic HF patients was coincident with increased myocardial expression of the MPC. Moreover, the genetic ablation of the MPC in cultured cardiomyocytes and in adult murine hearts was sufficient to induce hypertrophy and HF. Conversely, MPC overexpression attenuated drug-induced hypertrophy in a cell-autonomous manner. We also introduced a novel, highly potent MCT4 inhibitor that mitigated hypertrophy in cultured cardiomyocytes and in mice. Together, we find that alteration of the pyruvate-lactate axis is a fundamental and early feature of cardiac hypertrophy and failure.
Keywords:
LVAD; MCT4; MPC; VB124; cardiac metabolism; heart failure; hypertrophy; lactate; mitochondria; pyruvate.
Copyright © 2020 Elsevier Inc. All rights reserved.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Anion Transport Proteins / antagonists & inhibitors
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Anion Transport Proteins / genetics
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Anion Transport Proteins / metabolism*
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Cardiomegaly / chemically induced
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Cardiomegaly / complications
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Cardiomegaly / pathology*
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Heart Failure / etiology
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Heart Failure / pathology*
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Heart-Assist Devices
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Humans
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Lactic Acid / metabolism
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Membrane Potential, Mitochondrial
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Mice
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Mice, Inbred C57BL
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Mice, Knockout
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Mitochondria / metabolism
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Mitochondrial Membrane Transport Proteins / antagonists & inhibitors
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Mitochondrial Membrane Transport Proteins / genetics
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Mitochondrial Membrane Transport Proteins / metabolism*
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Monocarboxylic Acid Transporters / antagonists & inhibitors
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Monocarboxylic Acid Transporters / genetics
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Monocarboxylic Acid Transporters / metabolism*
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Muscle Proteins / antagonists & inhibitors
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Muscle Proteins / metabolism*
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Myocytes, Cardiac / cytology
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Myocytes, Cardiac / metabolism
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Pyruvic Acid / metabolism
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RNA Interference
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RNA, Small Interfering / metabolism
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Reactive Oxygen Species / metabolism
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Ventricular Function, Left / physiology
Substances
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Anion Transport Proteins
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MPC1 pyruvate carrier protein, mouse
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MPC2 pyruvate carrier protein, mouse
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Mitochondrial Membrane Transport Proteins
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Monocarboxylic Acid Transporters
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Muscle Proteins
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RNA, Small Interfering
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Reactive Oxygen Species
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Slc16a4 protein, mouse
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Lactic Acid
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Pyruvic Acid