Antitumor T cell reconditioning: improving metabolic fitness for optimal cancer immunotherapy

With the rapid rise of immunotherapy for cancer treatment, attention has focused on gaining a better understanding of T cell biology in the tumor microenvironment.  Elucidating the factors underlying changes in their function will allow for the development of new therapeutic strategies that could expand the patient population benefiting from immunotherapy, as well as circumvent therapy resistance. Cancers go beyond avoiding immune recognition and inducing T cell dysfunction through co-inhibitory molecules. Recent work has demonstrated that the tumor microenvironment elicits metabolic changes in T cells that dampen their ability to respond and manipulating these metabolic changes can strengthen an antitumor immune response. Here we review the metabolic status of various types of T cells, the energetic state of the tumor microenvironment, and proposed modalities for improvement of immunotherapy through metabolic remodeling.

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