AI Insight
Researchers performed comprehensive proteomic and transcriptomic analysis of dysfunctional CD8+ T cells from non-small cell lung cancer tumors, revealing that 8% of proteins show differential expression only at the protein level, not detectable by RNA analysis. Through genetic manipulation experiments, they identified two key regulators of T cell function: CHD4, a chromatin remodeler that when deleted enhances effector differentiation and cytokine production, and FASN, a fatty acid synthase that when deleted preserves mitochondrial fitness and sustains T cell function during chronic stimulation. These findings demonstrate that protein-level analysis uncovers functional regulators missed by standard gene expression studies.
Why it matters
This work reveals new therapeutic targets for restoring anti-tumor T cell activity in cancer patients. Understanding that CHD4 and FASN regulate T cell dysfunction through mechanisms invisible to standard RNA analysis could enable development of drugs that reinvigorate exhausted immune cells in solid tumors, potentially improving immunotherapy outcomes.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
CD8+ T cells in solid cancers progressively lose anti-tumor activity, yet the cell-intrinsic mechanisms driving this loss of function remain incompletely defined. Here, we performed matched proteomic and transcriptomic profiling of dysfunctional and bystander CD8+ tumor-infiltrating T cells isolated from primary tumors of treatment-naive non-small cell lung cancer patients. Proteomic analysis revealed widespread discordance with mRNA expression, with 8% of all quantified proteins displaying differential expression exclusively at the protein level. Genetic perturbation of such differentially expressed proteins identified the chromatin remodeler CHD4 and fatty acid synthase (FASN) as cell-intrinsic regulators of T cell function. CHD4 deletion resulted in altered gene-regulatory networks that promoted effector differentiation and enhanced cytokine production. In contrast, FASN deletion preserved mitochondrial fitness and sustained T cell functionality under chronic T cell receptor stimulation. Together, these findings demonstrate that proteomic profiling uncovers regulators of T cell functionality that are not apparent from transcriptomic analyses alone, highlighting an additional layer of regulatory control.
Source: Proteomics of human cancer-associated T cells identifies regulators of T cell functionality