Based on in vitro and animal studies, Th17 cells are classified as pathogenic (pTh17) or non-pathogenic (nTh17), but the inability to identify these subsets in primary human samples limits translation. We developed a single-cell ELISA to enrich human Th17s, enabling transcriptomic and flow-cytometric classification. nTh17 cells predominated in Type 2 diabetes and exhibited signatures of acylcarnitine synthesis, while knockdown of CPT1A demonstrated that acylcarnitine metabolism regulates Th17 pathogenicity.
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