Modulation of antitumor immunity contributes to the enhanced therapeutic efficacy of liposomal oxaliplatin in mouse model

Immune modulation of the tumor microenvironment has been reported to participate in the therapeutic efficacy of many chemotherapeutic agents. Recently, we reported that liposomal encapsulation of oxaliplatin (l‐OHP) within PEGylated liposomes conferred a superior antitumor efficacy to free l‐OHP in...

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Veröffentlicht in:Cancer science 2017-09, Vol.108 (9), p.1864-1869
Hauptverfasser: Shimizu, Taro, Abu Lila, Amr S., Nishio, Miho, Doi, Yusuke, Ando, Hidenori, Ukawa, Masami, Ishima, Yu, Ishida, Tatsuhiro
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container_issue 9
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container_title Cancer science
container_volume 108
creator Shimizu, Taro
Abu Lila, Amr S.
Nishio, Miho
Doi, Yusuke
Ando, Hidenori
Ukawa, Masami
Ishima, Yu
Ishida, Tatsuhiro
description Immune modulation of the tumor microenvironment has been reported to participate in the therapeutic efficacy of many chemotherapeutic agents. Recently, we reported that liposomal encapsulation of oxaliplatin (l‐OHP) within PEGylated liposomes conferred a superior antitumor efficacy to free l‐OHP in murine colorectal carcinoma‐bearing mice through permitting preferential accumulation of the encapsulated drug within tumor tissue. However, the contribution of the immune‐modulatory properties of liposomal l‐OHP and/or free l‐OHP to the overall antitumor efficacy was not elucidated. In the present study, therefore, we investigated the effect of liposomal encapsulation of l‐OHP within PEGylated liposomes on the antitumor immunity in both immunocompetent and immunodeficient mice. Liposomal l‐OHP significantly suppressed the growth of tumors implanted in immunocompetent mice, but not in immunodeficient mice. In immunocompetent mice, liposomal l‐OHP increased the tumor MHC‐1 level and preserved antitumor immunity through decreasing the number of immune suppressor cells, including regulatory T cells, myeloid‐derived suppressor cells, and tumor‐associated macrophages, which collectively suppress CD8+ T cell‐mediated tumor cells killing. In contrast, free l‐OHP ruined antitumor immunity. These results suggest that the antitumor efficacy of liposomal l‐OHP is attributed, on the one hand, to its immunomodulatory effect on tumor immune microenvironment that is superior to that of free l‐OHP, and on the other hand, to its direct cytotoxic effect on tumor cells. The antitumor efficacy of liposomal l‐OHP is attributed, on the one hand, to its immunomodulatory effect on tumor immune microenvironment that is superior to that of free l‐OHP, and on the other hand, to its direct cytotoxic effect on tumor cells.
doi_str_mv 10.1111/cas.13305
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Recently, we reported that liposomal encapsulation of oxaliplatin (l‐OHP) within PEGylated liposomes conferred a superior antitumor efficacy to free l‐OHP in murine colorectal carcinoma‐bearing mice through permitting preferential accumulation of the encapsulated drug within tumor tissue. However, the contribution of the immune‐modulatory properties of liposomal l‐OHP and/or free l‐OHP to the overall antitumor efficacy was not elucidated. In the present study, therefore, we investigated the effect of liposomal encapsulation of l‐OHP within PEGylated liposomes on the antitumor immunity in both immunocompetent and immunodeficient mice. Liposomal l‐OHP significantly suppressed the growth of tumors implanted in immunocompetent mice, but not in immunodeficient mice. 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subjects Animals
Antineoplastic Agents - administration & dosage
Antitumor activity
Antitumor immunity
Cancer therapies
CD8 antigen
Cell Line, Tumor
Chemotherapy
Colorectal cancer
Colorectal carcinoma
Colorectal Neoplasms - drug therapy
Colorectal Neoplasms - immunology
Cytotoxicity
drug delivery system
Drug dosages
Drug Screening Assays, Antitumor
Encapsulation
Histocompatibility Antigens Class I - metabolism
Immunity
Immunodeficiency
Immunologic Factors - administration & dosage
Immunomodulation
Immunoregulation
Immunotherapy
liposome
Liposomes
Lymphocytes
Lymphocytes T
Macrophages
Major histocompatibility complex
Male
Mice, Inbred BALB C
Mice, Nude
Neoplasm Transplantation
Organoplatinum Compounds - administration & dosage
Original
Oxaliplatin
Peptides
Polyethylene glycol
Studies
Suppressor cells
Tumor cells
Tumors
title Modulation of antitumor immunity contributes to the enhanced therapeutic efficacy of liposomal oxaliplatin in mouse model
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