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Oncolytic vaccinia virus synergizes with irinotecan in colorectal cancer.

ABSTRACT: Metastatic colorectal cancer (CRC) is complex clinical challenge for which there are limited treatment options. Chemotherapy with or without surgery provides moderate improvements in overall survival and quality of life; nevertheless the 5-year survival remains below 30%. Oncolytic vaccinia virus (VV) shows strong anti-tumour activity in models of CRC, however transient delays in disease progression are insufficient to lead to long-term survival. Here we examined the efficacy of VV with oxaliplatin or SN-38 (active metabolite of irinotecan) in CRC cell lines in vitro and VV with irinotecan in an orthotopic model of metastatic CRC. Synergistic improvements in in vitro cell killing were observed in multiple cell lines. Combination therapy was well tolerated in tumour-bearing mice and the median survival was significantly increased relative to monotherapy despite a drug-dependent decrease in the mean tumour titer. Increased apoptosis following in vitro and in vivo combination therapy was observed. In vitro cell cycle analysis showed increases in S-phase cells following infection occurred in both infected and uninfected cell populations. This corresponded to a 4-fold greater increase in apoptosis in the uninfected compared to infected cells following combination therapy. Combination treatment strategies are among the best options for patients with advanced cancers. VV is currently under clinical investigation in patients with CRC and the data presented here suggest that its combination with irinotecan may provide benefit to a subset of CRC patients. Further, investigation of this combination is necessary to determine the tumour characteristics responsible for mediating synergy.

SUBMITTER: Ottolino-Perry K

PROVIDER: S-EPMC5528789 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:BackgroundDespite availability of efficient treatment regimens for early stage colorectal cancer, treatment regimens for late stage colorectal cancer are generally not effective and thus need improvement. Oncolytic virotherapy using replication-competent vaccinia virus (VACV) strains is a promising new strategy for therapy of a variety of human cancers.MethodsOncolytic efficacy of replication-competent vaccinia virus GLV-1h68 was analyzed in both, cell cultures and subcutaneous xenograft tumor models.ResultsIn this study we demonstrated for the first time that the replication-competent recombinant VACV GLV-1h68 efficiently infected, replicated in, and subsequently lysed various human colorectal cancer lines (Colo 205, HCT-15, HCT-116, HT-29, and SW-620) derived from patients at all four stages of disease. Additionally, in tumor xenograft models in athymic nude mice, a single injection of intravenously administered GLV-1h68 significantly inhibited tumor growth of two different human colorectal cell line tumors (Duke's type A-stage HCT-116 and Duke's type C-stage SW-620), significantly improving survival compared to untreated mice. Expression of the viral marker gene ruc-gfp allowed for real-time analysis of the virus infection in cell cultures and in mice. GLV-1h68 treatment was well-tolerated in all animals and viral replication was confined to the tumor. GLV-1h68 treatment elicited a significant up-regulation of murine immune-related antigens like IFN-?, IP-10, MCP-1, MCP-3, MCP-5, RANTES and TNF-? and a greater infiltration of macrophages and NK cells in tumors as compared to untreated controls.ConclusionThe anti-tumor activity observed against colorectal cancer cells in these studies was a result of direct viral oncolysis by GLV-1h68 and inflammation-mediated innate immune responses. The therapeutic effects occurred in tumors regardless of the stage of disease from which the cells were derived. Thus, the recombinant vaccinia virus GLV-1h68 has the potential to treat colorectal cancers independently of the stage of progression.

Project description:Oncolytic viral therapy represents an alternative therapeutic strategy for the treatment of cancer. This therapy relies on efficient replication of virus in tumor cells in vivo with minimal or no replication in normal tissues. We recently described GLV-1h68 as a modified Vaccinia Virus (VACV) construct with exclusive in vivo tropism for tumor cells in experimental animal models. Moreover, we had previously observed a cell line-specific relationship between the ability of GLV-1h68 to replicate in vitro during the first 20 hours following infection and the in vivo ability to colonize and eliminate the corresponding tumor implant. Thus, we surveyed the in vitro permissivity to GLV-1h68 replication of the NCI-60 panel of cell lines, extensively characterized and used for the assessment of novel therapeutic modalities. All cell lines were cultured and infected in identical conditions. Pre-infection transcriptional profiling was obtained to search for correlates of permissivity to viral infection. Selected cell lines were also tested for permissivity to another VACV and a vesicular stomatitis virus (VSV) strain. We observed that permissivity to VACV infection during the first 20 hours is quite heterogeneous among cell lines but highly reproducible within each cell line. The tissue of origin of each cell line does not influence permissivity to infection with the exception of B cell derivation. Permissivity correlates between two VACV constructs and between them and VSV suggesting a common permissive phenotype. No clear transcriptional pattern predictive of permissivity to infection could be identified though weak associations were observed that suggest a multifactorial control of viral replication. This study adds to the current characterization of the NCI-60 panel to guide the design and interpretation of experimental models testing oncolytic therapies. Seventy-four microarray samples were obtained from 8 renal cancer cell lines (786-0, A498, ACHN, CAKI-I, RXF-393, SN12C, TK-10, UO-31); 12 melanoma cell lines (888-MEL, 1858-MEL, 1936-MEL, 397, A375-MEL, LOX IMVI, M14, SK-MEL-2, SK-MEL-5, SK-MEL-28, UACC 62, UACC 257 ); 11 lung cancer cell lines (A549 p7, A549 p107, EKVX, HOP-62, HOP-92, NCI-H23, NCI-H226, NCI-H322M, NCI-H460, NCI-H522, NCI-H1299); 13 colon cancer cell lines (HCT-15, HCT-116, HT-29 p155, HT-29 p9, KM-12, SW-620, Colo 205, HCC 2998, NCI-ADR-RES, OVCAR 3 p7, OVCAR 3 p42, OVCAR 5, SK-OV-3); 3 ovarian cancer cell lines (OVCAR 4, OVCAR 8, IGROV); 1 cervical cancer cell line (Siha); 6 brain cancer cell lines (SNB 19, SF 295, SF 298, SNB 75, U251, SF 539); 7 breast cancer cell lines (BT-549, GI101A, HS-578T, MCF 7, MDA-MB-231 p41, MDA-MB-435, MDA-MB-231 p6); 7 hematopoietic cancer cell lines (CCFR-CEM, HL-60, K-562, MOLT-4, RPMI 8226, SR, T-47D); 3 prostatic cancer cell lines (Du-145, PC 3 p7, PC 3 p35); 1 hepatic cancer cell lines (Huh 7.5.1); and 2 pancreatic cancer cell lines (MIA PACA 2, Panc 1). Two technical repeats were performed (cell lines Siha and SNB-19). Reference T-RNA was obtained from 6 normal donor PBMCs.

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Oncolytic vaccinia virus synergizes with irinotecan in colorectal cancer.

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