Metabolic and survival pathways in CD8+ T cells

Metabolic and survival pathways in CD8+ T cells refer to the integrated network of nutrient-sensing and energy-producing processes, such as glycolysis and oxidative phosphorylation, that sustain the activation and longevity of cytotoxic T lymphocytes (Pearce & Pearce, 2013). These pathways are governed by central signaling nodes like the mechanistic target of rapamycin (mTOR) and AKT, which promote anabolic growth, and AMPK, which manages energy stress (Pollizzi & Powell, 2014). Survival is further regulated by the balance of Bcl-2 family proteins, which prevent apoptosis during the contraction phase of the immune response (van der Windt et al., 2012). In disease states like cancer, the tumor microenvironment often suppresses these pathways by competing for nutrients or through inhibitory signaling (e.g., via PD-1), leading to T cell exhaustion and functional failure (Chang et al., 2015). Therapeutic approaches in immunometabolism seek to reprogram these pathways using checkpoint inhibitors or metabolic modulators to enhance the persistence and efficacy of T cells in immunotherapy (Buck et al., 2016). Because this term refers to a broad set of biological processes rather than a single protein, it is categorized as a pathway-level concept rather than a discrete molecular target (O'Sullivan et al., 2017).

Other names

CD8+ T cell immunometabolismT cell survival signalingCytotoxic T lymphocyte metabolic reprogrammingCD8+ T cell metabolic fitness

Modulation of metabolic checkpoints and intracellular signaling cascades to optimize nutrient utilization and prevent programmed cell death in cytotoxic T cells.