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Targeting Hypoxia-Inducible Factor-1α/Pyruvate Dehydrogenase Kinase 1 Axis by Dichloroacetate Suppresses Bleomycin-induced Pulmonary Fibrosis.
- Source :
-
American journal of respiratory cell and molecular biology [Am J Respir Cell Mol Biol] 2018 Feb; Vol. 58 (2), pp. 216-231. - Publication Year :
- 2018
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Abstract
- Hypoxia has long been implicated in the pathogenesis of fibrotic diseases. Aberrantly activated myofibroblasts are the primary pathological driver of fibrotic progression, yet how various microenvironmental influences, such as hypoxia, contribute to their sustained activation and differentiation is poorly understood. As a defining feature of hypoxia is its impact on cellular metabolism, we sought to investigate how hypoxia-induced metabolic reprogramming affects myofibroblast differentiation and fibrotic progression, and to test the preclinical efficacy of targeting glycolytic metabolism for the treatment of pulmonary fibrosis. Bleomycin-induced pulmonary fibrotic progression was evaluated in two independent, fibroblast-specific, promoter-driven, hypoxia-inducible factor (Hif) 1A knockout mouse models and in glycolytic inhibitor, dichloroacetate-treated mice. Genetic and pharmacological approaches were used to explicate the role of metabolic reprogramming in myofibroblast differentiation. Hypoxia significantly enhanced transforming growth factor-β-induced myofibroblast differentiation through HIF-1α, whereas overexpression of the critical HIF-1α-mediated glycolytic switch, pyruvate dehydrogenase kinase 1 (PDK1) was sufficient to activate glycolysis and potentiate myofibroblast differentiation, even in the absence of HIF-1α. Inhibition of the HIF-1α/PDK1 axis by genomic deletion of Hif1A or pharmacological inhibition of PDK1 significantly attenuated bleomycin-induced pulmonary fibrosis. Our findings suggest that HIF-1α/PDK1-mediated glycolytic reprogramming is a critical metabolic alteration that acts to promote myofibroblast differentiation and fibrotic progression, and demonstrate that targeting glycolytic metabolism may prove to be a potential therapeutic strategy for the treatment of pulmonary fibrosis.
- Subjects :
- Animals
Bleomycin
Cell Line
Humans
Lung pathology
Mice
Mice, Knockout
Myofibroblasts cytology
Myofibroblasts pathology
Protein Serine-Threonine Kinases metabolism
Pulmonary Fibrosis chemically induced
Pulmonary Fibrosis drug therapy
Pyruvate Dehydrogenase Acetyl-Transferring Kinase
RNA Interference
RNA, Small Interfering genetics
Cell Hypoxia physiology
Dichloroacetic Acid pharmacology
Glycolysis physiology
Hypoxia-Inducible Factor 1, alpha Subunit genetics
Protein Serine-Threonine Kinases antagonists & inhibitors
Pulmonary Fibrosis pathology
Subjects
Details
- Language :
- English
- ISSN :
- 1535-4989
- Volume :
- 58
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- American journal of respiratory cell and molecular biology
- Publication Type :
- Academic Journal
- Accession number :
- 28915065
- Full Text :
- https://doi.org/10.1165/rcmb.2016-0186OC