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Determining changes in the oxidized proteome of human CD8+ T cells with enhancing proteasome activity

ABSTRACT: Chronic T cell receptor (TCR) stimulation, combined with adverse conditions in the tumor microenvironment (TME) such as hypoxia and nutrient deprivation, frequently results in T cell exhaustion. Exhausted T cells (TEX) experience oxidative stress, which causes an accumulation of oxidized proteins within the cells. We hypothesized that oxidized protein formation might exceed proteasomal degradation capacity, leading to their accumulation and impairing TEX cell fitness. By pharmacologically boosting proteasome activity, we decreased the accumulation of oxidized proteins, delaying T exhaustion and enhancing T cell fitness, resulting in superior anti-tumor control.

INSTRUMENT(S):

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Mikel Azkargorta

LAB HEAD: Felix Elortza

PROVIDER: PXD070152 | Pride | 2026-03-12

REPOSITORIES: Pride

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	250923_250911D_DeBlas_RIME.xlsx	Xlsx
	250925_250911D_DeBlas_1_S1-A10_1_2811.d.zip	Other
	250925_250911D_DeBlas_2_S1-A11_1_2812.d.zip	Other
	250925_250911D_DeBlas_3_S1-A12_1_2813.d.zip	Other
	250925_250911D_DeBlas_4_S1-B1_1_2814.d.zip	Other

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Enhancing Proteasome Activity in T Cells Alleviates Exhaustion and Improves Antitumor Immunity

Project description:Chronic T cell receptor (TCR) stimulation combined with adverse conditions in the tumor microenvironment (TME), such as hypoxia and nutrient deprivation, frequently results in T cell exhaustion. Exhausted T cells (TEX) experience oxidative stress, which causes an accumulation of oxidized proteins within the cells. We hypothesized that oxidized protein formation might exceed proteasomal degradation capacity, leading to their accumulation and impairing T cell fitness. Single-cell transcriptomics analysis across 16 tumor types revealed increased expression of proteasome genes in TEX compared to non-exhausted T cells. In a robust in vitro model for the generation of human TEX, the cells exhibited hallmarks of exhaustion, with higher levels of reactive oxygen species (ROS)-induced protein oxidation and increased expression of proteasome genes. Pharmacological and genetic enhancement of proteasome activity delayed the onset of T cell exhaustion, improved T cell fitness, and translated into superior antitumor immunity and tumor control. These findings identify proteasome modulation as a promising strategy to counteract TME-driven T cell dysfunction, potentially overcoming a major obstacle to the efficacy of cell-based immunotherapies in solid tumors.

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