Adoptive immunotherapy of disseminated leukemia with TCR-transduced, CD8+ T cells expressing a known endogenous TCR.

Publication Type:

Journal Article

Source:

Molecular therapy : the journal of the American Society of Gene Therapy, Volume 17, Issue 4, p.742-9 (2009)

Keywords:

2009, Animals, CD8-Positive T-Lymphocytes, Clinical Research Division, Genetic Vectors, Immunotherapy, Adoptive, Leukemia, Experimental, MICE, Mice, Inbred C57BL, Receptors, Antigen, T-Cell, Transduction, Genetic, Transfection

Abstract:

Adoptive T-cell immunotherapy has shown promise in the treatment of human malignancies, but the challenge of isolating T cells with high avidity for tumor antigens in each patient has limited application of this approach. The transfer into T cells of T-cell receptor (TCR) genes encoding high-affinity TCRs recognizing defined tumor-associated antigens can potentially circumvent this obstacle. Using a well-characterized murine model of adoptive T-cell immunotherapy for widely disseminated leukemia, we demonstrate that TCR gene-modified T cells can cure mice of disseminated tumor. One goal of such adoptive therapy is to establish a persistent memory response to prevent recurrence; however, long-term function of transferred TCR-transduced T cells is limited due to reduced expression of the introduced TCR in vivo in quiescent resting T cells. However, by introducing the TCR into a cell with a known endogenous specificity, activation of these T cells by stimulation through the endogenous TCR can be used to increase expression of the introduced TCR, potentially providing a strategy to increase the total number of tumor-reactive T cells in the host and restore more potent antitumor activity.