Teleological role of L-2-hydroxyglutarate dehydrogenase in the kidney.

Journal Article

L-2-hydroxyglutarate (L-2HG) is an oncometabolite found elevated in renal tumors. However, this molecule might have physiological roles that extend beyond its association with cancer, as L-2HG levels are elevated in response to hypoxia and during Drosophila larval development. L-2HG is known to be metabolized by L-2HG dehydrogenase (L2HGDH), and loss of L2HGDH leads to elevated L-2HG levels. Despite L2HGDH being highly expressed in the kidney, its role in renal metabolism has not been explored. Here, we report our findings utilizing a novel CRISPR/Cas9 murine knockout model, with a specific focus on the role of L2HGDH in the kidney. Histologically, L2hgdh knockout kidneys have no demonstrable histologic abnormalities. However, GC-MS metabolomics demonstrates significantly reduced levels of the TCA cycle intermediate succinate in multiple tissues. Isotope labeling studies with [U-13C] glucose demonstrate that restoration of L2HGDH in renal cancer cells (which lowers L-2HG) leads to enhanced incorporation of label into TCA cycle intermediates. Subsequent biochemical studies demonstrate that L-2HG can inhibit the TCA cycle enzyme α-ketoglutarate dehydrogenase. Bioinformatic analysis of mRNA expression data from renal tumors demonstrates that L2HGDH is co-expressed with genes encoding TCA cycle enzymes as well as the gene encoding the transcription factor PGC-1α, which is known to regulate mitochondrial metabolism. Restoration of PGC-1α in renal tumor cells results in increased L2HGDH expression with a concomitant reduction in L-2HG levels. Collectively, our analyses provide new insight into the physiological role of L2HGDH as well as mechanisms that promote L-2HG accumulation in disease states.

Full Text

Duke Authors

Cited Authors

  • Brinkley, G; Nam, H; Shim, E; Kirkman, R; Kundu, A; Karki, S; Heidarian, Y; Tennessen, JM; Liu, J; Locasale, JW; Guo, T; Wei, S; Gordetsky, J; Johnson-Pais, TL; Absher, D; Rakheja, D; Challa, AK; Sudarshan, S

Published Date

  • November 27, 2020

Published In

Volume / Issue

  • 13 / 11

PubMed ID

  • 32928875

Pubmed Central ID

  • 32928875

Electronic International Standard Serial Number (EISSN)

  • 1754-8411

Digital Object Identifier (DOI)

  • 10.1242/dmm.045898

Language

  • eng

Conference Location

  • England