Fungal infection drives metabolic reprogramming in epithelial cells via aerobic glycolysis and an alternative TCA cycle shunt

TL;DR

This study shows how Candida albicans infection alters the metabolism of oral epithelial cells, promoting glycolysis and a new TCA cycle pathway, which affects immune responses and cell survival.

Contribution

The study identifies a GOT1-dependent TCA cycle shunt and the role of glycolysis in epithelial cell responses to Candida albicans infection.

Findings

C. albicans infection increases glycolysis and decreases TCA cycle activity in oral epithelial cells.

GOT1 is crucial for epithelial cell survival during infection and mediates a TCA cycle shunt.

Glucose supplementation disrupts epithelial immune responses, suggesting fungal benefit from metabolic shifts.

Abstract

Candida albicans–induced immunometabolic changes drive complex responses in immune cells. However, whether and how C. albicans causes remodeling of oral epithelial cell (OEC) metabolism is unclear. Here, we use in vitro experiments and patient biopsies to demonstrate that OECs undergo metabolic reprogramming when infected by C. albicans independently of candidalysin secretion, increasing glycolysis and decreasing tricarboxylic acid (TCA) cycle activity. Glycolysis and glucose transport inhibition show that these pathways support OEC cytokine release, highlighting the partial control of antifungal epithelial immunity by cellular metabolism. However, glucose supplementation disrupts OEC responses both in vitro and in vivo, suggesting that the fungus benefits from these metabolic shifts and that increased aerobic glycolysis in OECs is detrimental. Genome-scale metabolic modeling predicted a shutdown of the TCA cycle and a previously unidentified role for glutamic-oxaloacetic transaminase 1 (GOT1) in response to C. albicans, which was subsequently shown to be important for OEC survival during infection. This study reveals a fundamental role for hexose metabolism and identifies a GOT1-mediated TCA cycle shunt in regulating OEC survival and immune responses during mucosal fungal infections.

Candida hijacks epithelial metabolism via glycolysis and GOT1-dependent TCA shunt, influencing antifungal defense.

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