T cells expressing CD19-specific Engager Molecules for the Immunotherapy of CD19-positive Malignancies

Mireya Paulina Velasquez, David Torres, Kota Iwahori, Sunitha Kakarla, Caroline Arber, Tania Rodriguez-Cruz, Arpad Szoor, Challice Bonifant, Claudia Gerken, Laurence J.N. Cooper, Xiao Tong Song, Stephen Gottschalk

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Abstract

T cells expressing chimeric antigen receptors (CARs) or the infusion of bispecific T-cell engagers (BITEs) have shown antitumor activity in humans for CD19-positive malignancies. While BITEs redirect the large reservoir of resident T cells to tumors, CAR T cells rely on significant in vivo expansion to exert antitumor activity. We have shown that it is feasible to modify T cells to secrete solid tumor antigen-specific BITEs, enabling T cells to redirect resident T cells to tumor cells. To adapt this approach to CD19-positive malignancies we now generated T cells expressing secretable, CD19-specific BITEs (CD19-ENG T cells). CD19-ENG T cells recognized tumor cells in an antigen-dependent manner as judged by cytokine production and tumor killing, and redirected bystander T cells to tumor cells. Infusion of CD19-ENG T cells resulted in regression of leukemia or lymphoma in xenograft models and a survival advantage in comparison to control mice. Genetically modified T cells expressing engager molecules may present a promising addition to current CD19-targeted immunotherapies.

Original languageEnglish (US)
Article number27130
JournalScientific reports
Volume6
DOIs
StatePublished - Jun 3 2016
Externally publishedYes

ASJC Scopus subject areas

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    Velasquez, M. P., Torres, D., Iwahori, K., Kakarla, S., Arber, C., Rodriguez-Cruz, T., Szoor, A., Bonifant, C., Gerken, C., Cooper, L. J. N., Song, X. T., & Gottschalk, S. (2016). T cells expressing CD19-specific Engager Molecules for the Immunotherapy of CD19-positive Malignancies. Scientific reports, 6, [27130]. https://doi.org/10.1038/srep27130