Metabolic modulation and immune checkpoint therapy: overcoming CD8 T cell exhaustion in the tumor microenvironment

CD8+ T cells play a crucial role in tumor immunotherapy, especially in immune checkpoint therapy, and therefore have become the focus of cancer research. However, although immune checkpoint treatment has shown some efficacy in clinical trials, its effect is still limited by tumor immune escape. Tumors weaken CD8+ T cell function by adapting to immune stress, while mechanisms such as metabolic reprogramming and regulation of immunosuppressive factors further reduce their anti-tumor activity. Based on existing research and data, this paper discusses CD8+ T cell exhaustion, immune checkpoint regulation (PD-1/CTLA-4), and tumor microenvironment metabolism, and summarizes strategies to enhance the effect of immunotherapy. Studies have shown that by inhibiting T cell exhaustion, blocking immune checkpoint signaling pathways, and optimizing metabolism, CD8+ T cell function can be significantly enhanced and the overall therapeutic effect can be improved. However, while metabolic intervention appears promising, its clinical feasibility and safety require further validation. This study provides a theoretical basis for optimizing T cell immunotherapy and provides new ideas for clinical treatment.