Glutamine is the most abundant amino acid in human serum, and it can provide carbon and nitrogen for biosynthesis, which is crucial for proliferating cells. Moreover, it is widely known that glutamine metabolism is reprogrammed in cancer cells. Many cancer cells undergo metabolic reprogramming targeting glutamine, increasing its uptake to meet their rapid proliferation demands. An increasing amount of study is being done on the particular glutamine metabolic pathways in cancer cells.Further investigation into the function of glutamine in immune cells is warranted given the critical role these cells play in the fight against cancer. Immune cells use glutamine for a variety of biological purposes, including the growth, differentiation, and destruction of cancer cells. With the encouraging results of cancer immunotherapy in recent years, more investigation into the impact of glutamine metabolism on immune cell function in the cancer microenvironment could lead to the discovery of new targets and therapeutic approaches.Oral supplementation with glutamine also enhances the immune capabilities of cancer patients, improves the sensitivity to chemotherapy and radiotherapy, and improves prognosis. The unique metabolism of glutamine in cancer cells, its function in various immune cells, the impact of inhibitors of glutamine metabolism, and the therapeutic use of glutamine supplements are all covered in detail in this article.
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