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Nat Med. 2017 Jun;23(6):753-762. doi: 10.1038/nm.4328. Epub 2017 Apr 24.

Pyruvate kinase M2 activation may protect against the progression of diabetic glomerular pathology and mitochondrial dysfunction.

Author information

1
Research Division, Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, USA.
2
Sanofi-Aventis Deutschland GmbH, Frankfurt am Main, Germany.
3
Veterans Affairs Medical Center, Iowa City, Iowa, USA.
4
Queen's University Belfast, Belfast, UK.
5
Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois, USA.
6
State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College and Beijing Key Laboratory of Drug Target and Screening Research, Beijing, China.
7
Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas, USA.
8
Beth Israel Deaconess Medical Center, Division of Anatomic Pathology, Boston, Massachusetts, USA.
9
Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.

Abstract

Diabetic nephropathy (DN) is a major cause of end-stage renal disease, and therapeutic options for preventing its progression are limited. To identify novel therapeutic strategies, we studied protective factors for DN using proteomics on glomeruli from individuals with extreme duration of diabetes (ł50 years) without DN and those with histologic signs of DN. Enzymes in the glycolytic, sorbitol, methylglyoxal and mitochondrial pathways were elevated in individuals without DN. In particular, pyruvate kinase M2 (PKM2) expression and activity were upregulated. Mechanistically, we showed that hyperglycemia and diabetes decreased PKM2 tetramer formation and activity by sulfenylation in mouse glomeruli and cultured podocytes. Pkm-knockdown immortalized mouse podocytes had higher levels of toxic glucose metabolites, mitochondrial dysfunction and apoptosis. Podocyte-specific Pkm2-knockout (KO) mice with diabetes developed worse albuminuria and glomerular pathology. Conversely, we found that pharmacological activation of PKM2 by a small-molecule PKM2 activator, TEPP-46, reversed hyperglycemia-induced elevation in toxic glucose metabolites and mitochondrial dysfunction, partially by increasing glycolytic flux and PGC-1α mRNA in cultured podocytes. In intervention studies using DBA2/J and Nos3 (eNos) KO mouse models of diabetes, TEPP-46 treatment reversed metabolic abnormalities, mitochondrial dysfunction and kidney pathology. Thus, PKM2 activation may protect against DN by increasing glucose metabolic flux, inhibiting the production of toxic glucose metabolites and inducing mitochondrial biogenesis to restore mitochondrial function.

Comment in

PMID:
28436957
PMCID:
PMC5575773
DOI:
10.1038/nm.4328
[Indexed for MEDLINE]
Free PMC Article

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