Suppression of FIP200 and autophagy by tumor-derived lactate promotes naïve T cell apoptosis and affects tumor immunity

Document Type


Publication Date


Publication Title

Sci Immunol


Naïve T cells are poorly studied in cancer patients. We report that naïve T cells are prone to undergo apoptosis due to a selective loss of FAK family-interacting protein of 200 kDa (FIP200) in ovarian cancer patients and tumor-bearing mice. This results in poor antitumor immunity via autophagy deficiency, mitochondria overactivation, and high reactive oxygen species production in T cells. Mechanistically, loss of FIP200 disables the balance between proapoptotic and antiapoptotic Bcl-2 family members via enhanced argonaute 2 (Ago2) degradation, reduced Ago2 and microRNA1198-5p complex formation, less microRNA1198-5p maturation, and consequently abolished microRNA1198-5p-mediated repression on apoptotic gene Bak1 Bcl-2 overexpression and mitochondria complex I inhibition rescue T cell apoptosis and promoted tumor immunity. Tumor-derived lactate translationally inhibits FIP200 expression by down-regulating the nicotinamide adenine dinucleotide level while potentially up-regulating the inhibitory effect of adenylate-uridylate-rich elements within the 3' untranslated region of Fip200 mRNA. Thus, tumors metabolically target naïve T cells to evade immunity.

Medical Subject Headings

Animals; Apoptosis; Autophagy; Cell Line, Tumor; Female; Gene Expression Regulation, Neoplastic; Humans; Intracellular Signaling Peptides and Proteins; Lactic Acid; Male; Mice, Inbred C57BL; Mice, Knockout; Mice, Transgenic; Neoplasms, Experimental; Ovarian Neoplasms; Protein-Tyrosine Kinases; T-Lymphocytes

PubMed ID