Combined immunotherapy with whole tumor lysate-pulsed interleukin-15-activated dendritic cells and cucurbitacin I promotes strong CD8(+) T-cell responses and cures highly aggressive lymphoma

Cytotherapy
Sumit Kumar HiraPartha Pratim Manna

Abstract

Dendritic cell (DC)-based therapies could be important strategies for lymphoma treatment. AKR/J mice with Dalton's lymphoma were treated with recombinant interleukin-15 (rIL-15)-activated autologous DCs and pulsed with whole tumor cell lysates in the presence or absence of suboptimal doses of the STAT3 inhibitor cucurbitacin I. One group of treated mice received an additional dose of rIL-15 to boost the DC-based adoptive cell therapy (ACT). Kaplan-Meier survival analysis and multiple immunologic and enzymatic parameters were assessed to demonstrate the efficacy of the vaccination protocol. Therapy with tumor lysate-pulsed, rIL-15-activated DCs plus cucurbitacin I significantly prolongs the survival of tumor-bearing mice but fails to provide a complete cure. Additional treatment of vaccinated mice with rIL-15 dramatically improves the therapeutic efficacy and provides a lifelong cure with no relapse. DCs derived from the surviving vaccinated mice regained their anti-tumor potential against the lymphoma cells with respect to growth inhibition and cytotoxicity. Both cluster of differentiation (CD)4(+) and CD8(+) T cells were mobilized in metastatic organs of successfully vaccinated mice in large numbers and demonstrated antigen-sp...Continue Reading

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