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PLoS One. 2018 Apr 25;13(4):e0196033. doi: 10.1371/journal.pone.0196033. eCollection 2018.

T cell mediated immunity after combination therapy with intralesional PV-10 and blockade of the PD-1/PD-L1 pathway in a murine melanoma model.

Author information

1
Department of Immunology, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, United States of America.
2
Sarcoma Program, H Lee Moffitt Cancer Center and Research Institute, Tampa, Florida, United States of America.
3
Department of Cutaneous Oncology at H. Lee Moffitt Cancer and Research Institute Tampa, Florida, United States of America.

Abstract

Intralesional (IL) injection of Rose Bengal (PV-10) induces regression of injected and uninjected lesions in several murine tumor models. In this study, we investigated the anti-tumor response of combining IL PV-10 with blockade of the PD-1 / PD-L1 pathway and the role of immune cell populations in eliciting this response. To investigate the role of T cell subsets in mediating an immune response, B16 or M05 melanoma-bearing mice received combination therapy as well as CD8+, CD4+, or CD25+ depleting antibodies. Tumor growth was measured. T cells were collected from spleens or tumors, and phenotype, activation markers, and reactivity were measured. Splenocytes from mice treated with combination therapy had increased OVA antigen-specific CD8+ T cells in M05-tumor-bearing mice. Depletion of CD4+ T cells or regulatory T cells (Tregs) in combination with IL PV-10 and anti-PD-1 antibody treatment resulted in an enhanced anti-tumor effect. Treatment with CD8+ depleting antibody abrogated anti-tumor immunity. These results support a clinical study for the safety and anti-tumor immune responses with combination therapy of IL PV-10 and PD-1/PD-L1 blockade.

PMID:
29694419
PMCID:
PMC5918896
DOI:
10.1371/journal.pone.0196033
[Indexed for MEDLINE]
Free PMC Article

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