Glycolytic ATP fuels phosphoinositide 3-kinase signaling to support effector T helper 17 cell responses.
Level 5 - mechanism / opinion, no new human data
Preclinical animal model and cellular mechanistic study (not clinical CEBM)
PubMed 33979589 · doi:10.1016/j.immuni.2021.04.008
What was done
Researchers investigated the role of lactate dehydrogenase A (LDHA) and glycolytic ATP in antigen-driven T helper 17 (Th17) cell responses using T cell-specific knockout mice (Cd4 Cre Ldha fl/fl) in an experimental autoimmune encephalomyelitis (EAE) model, combined with cellular assays evaluating redox balance, ATP synthesis, and PI3K/Akt/Foxo1 signaling pathways.
What was found
No numerical metrics or effect sizes were reported in the abstract. Cd4 Cre Ldha fl/fl mice showed resistance to Th17-mediated EAE with impaired T cell activation, migration, proliferation, and differentiation. Mechanistically, LDHA deficiency disrupted cellular redox balance, decreased ATP generation, impaired PI3K-catalyzed PIP3 production, and diminished PI3K-dependent Akt activation, thereby preventing phosphorylation-mediated inhibition of the repressor Foxo1. Expression of Akt-insensitive Foxo1 recapitulated the knockout phenotype.
Why it matters
This work identifies a positive feedback loop connecting aerobic glycolysis and ATP generation directly to PI3K signaling required for effector Th17 cell pathogenicity in autoimmunity.
Limits
The abstract provides no sample sizes or quantitative data. All findings are derived from rodent disease models and bench mechanistic assays, meaning translational relevance to human Th17-mediated diseases remains to be demonstrated.
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