Immune reconstitution via T cell support

Immune reconstitution via T cell support refers to strategies and biological mechanisms that restore T cell-mediated immunity following lymphodepleting events such as chemotherapy or hematopoietic stem cell transplantation. This process relies on two main pathways: thymopoiesis (generation of new T cells in the thymus) and peripheral homeostatic proliferation (driven by increased cytokine levels such as IL-7 and IL-15), which expand residual T cell populations to replenish the pool. Successful T cell reconstitution is essential to reduce infection risk, improve vaccine responses, prevent disease relapse, and avoid autoimmunity, but may be slow and incomplete, particularly in adults. Pharmacological support, such as administration of IL-7, may enhance both thymic-dependent and peripheral T cell proliferation. Clinical challenges include the risk of autoimmunity, loss of repertoire diversity, or exacerbation of GVHD in transplant patients.

Other names

Immune reconstitutionT cell recoveryT cell reconstitutionLymphopenia-induced T cell expansion

Cytokine-mediated proliferation of naïve and memory T cells (IL-7, IL-15) Homeostatic peripheral expansion (driven by lymphopenia, increased cytokine levels) Thymopoiesis (generation of new naïve T cells in thymus) Adoptive immunotherapy (infusion of T cells or precursors)