CD8+ T cell

Byaibio

CD8+ T cells are cytotoxic adaptive immune cells that mediate antitumor killing, and their function can be inhibited in tumor tissues, including the cervical cancer microenvironment. They are central to responses across multiple cancers, where infiltration, proliferation, and effector activity can be increased by interventions such as akkermansia, lactobacillus johnsonii, nicotinic acid, low dose radiotherapy, and nkg2a blockade. Recent studies also link CD8+ T-cell dysfunction to immunosuppressive states driven by ksr2, cholic acid/NR1H4 signaling, hypoalbuminemia, and tumor-associated sympathetic signaling, while mitochondrial complex I and SETDB2 deficiency can enhance their killing or infiltration. In ovarian carcinoma, CD8+ T cells show functional crosstalk with NK cells, and blocking NKG2A promotes their responses. A 2026 Science Advances study (PMID:42018612) further identified CD11c+KLRG1+ effector CD8+ T cells as a major IFN-γ source and a driver of hepatotoxicity, highlighting that this population can also mediate toxicity when broadly activated.

Cancer / Immunotherapy

  • In cervical cancer, CD8+ T-cell function was reported as inhibited in the tumor microenvironment, consistent with an immunosuppressive state. (PMID:41283998)
  • A biomimetic nanoplatform and optogenetic CD274 editing enhanced CD8+ T-cell infiltration and proliferation in HNSCC immunogenicity studies. (PMID:41624538)
  • Hypoalbuminemia-associated tumor suppression was linked to reduced adaptive immune cell abundance, including CD8+ T cells, in the suppressed tumor microenvironment. (PMID:41940988)
  • SETDB2 deficiency enhanced infiltration of effector T cells, including CD8+ T cells, in hepatocellular carcinoma. (PMID:41946995)
  • High mitochondrial complex I expression increased CD8+ T-cell-mediated killing in co-culture systems, supporting a metabolic mechanism for improved cytotoxicity. (PMID:41965870)

Microbiome / Metabolic modulation

  • lactobacillus johnsonii and nicotinic acid expanded CD8+ T cells, including IFNγ+PD-1+ subsets, contributing to antitumor efficacy in hepatocellular carcinoma. (PMID:41570324)
  • akkermansia enrichment enhanced intratumoral CD8+ T-cell functions, as confirmed by single-cell RNA sequencing. (PMID:42017465)
  • Cholic acid induced CD8+ T-cell dysfunction through NR1H4-dependent PD1 upregulation, linking bile-acid signaling to immune escape. (PMID:41780844)
  • ksr2-associated metabolic reprogramming was associated with reduced CD8+ T-cell infiltration and impaired function in an immunosuppressive microenvironment. (PMID:42012646)

Combination therapy / Immune checkpoint modulation

  • low dose radiotherapy combined with immunotherapy enhanced CD8+ T-cell functionality in immune-excluded tumors. (PMID:41995577)
  • nkg2a blockade promoted CD8+ T-cell responses in high-grade serous ovarian carcinoma by strengthening NK cell–CD8+ T-cell crosstalk. (PMID:41998001)
  • Chemical sympathectomy increased CD8+ T-cell infiltration and effector function, suggesting neural regulation of antitumor immunity. (PMID:41850182)
  • ERRα inhibition potentiated effector T-cell cytotoxicity in co-culture and in vivo experiments, supporting a metabolic-immunologic control point. (PMID:41791643)

T-cell biology / Toxicity

  • CD8+ T cells engaged in bidirectional functional crosstalk with NK cells; depletion of either population impaired the other in ovarian carcinoma. (PMID:41998001)
  • LTβR signaling was associated with restraint of effector CD8 T-cell contraction, indicating a role in regulating T-cell persistence. (PMID:42018612)
  • A 2026 Science Advances study identified CD11c+KLRG1+ effector CD8 T cells as the primary IFN-γ source and a driver of hepatotoxicity. (PMID:42018612)