Fumarate Upregulates Surface Expression of ULBP2/ULBP5 by Scavenging Glutathione Antioxidant Capacity

The Journal of Immunology : Official Journal of the American Association of Immunologists
Rikke Illum HøghSøren Skov

Abstract

Fumarate is a tricarboxylic acid cycle metabolite whose intracellular accumulation is linked to inflammatory signaling and development of cancer. In this study, we demonstrate that endogenous fumarate accumulation upregulates surface expression of the immune stimulatory NK group 2, member D (NKG2D) ligands ULBP2 and ULBP5. In agreement with this, accumulation of fumarate by the therapeutic drug dimethyl fumarate (DMF) also promotes ULBP2/5 surface expression. Mechanistically, we found that the increased ULBP2/5 expression was dependent on oxidative stress and the antioxidants N-acetylcysteine and glutathione (GSH) abrogated ULBP2/5 upregulated by DMF. Fumarate can complex with GSH and thereby exhaust cells of functional GSH capacity. In line with this, inhibition of GSH reductase (GR), the enzyme responsible for GSH recycling, promoted ULBP2/5 surface expression. Loss of the tricarboxylic acid cycle enzyme fumarate hydratase (FH) associates with a malignant form of renal cancer characterized by fumarate accumulation and increased production of reactive oxygen species, highlighting fumarate as an oncometabolite. Interestingly, FH-deficient renal cancer cells had low surface expression of ULBP2/5 and were unresponsive to DMF trea...Continue Reading

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Sep 18, 2020·Wiley Interdisciplinary Reviews. Developmental Biology·Hongjie Li
Aug 28, 2020·Frontiers in Immunology·Sofie H MøllerSøren Skov

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