Age-associated impairment of antitumor immunity in carcinoma-bearing mice and restoration by oral administration of Lentinula edodes mycelia extract

Because cancer is associated with aging, immunological features in the aged should be considered in anticancer immunotherapy. In this study, we investigated antitumor immunity in aged mice using a CT26 colon carcinoma model. The tumor growth of CT26 was accelerated in aged mice compared with that in...

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Veröffentlicht in:Cancer Immunology, Immunotherapy Immunotherapy, 2016-08, Vol.65 (8), p.961-972
Hauptverfasser: Ishikawa, Satoru, Matsui, Yasunori, Wachi, Satoshi, Yamaguchi, Hiroshi, Harashima, Nanae, Harada, Mamoru
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container_issue 8
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container_title Cancer Immunology, Immunotherapy
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creator Ishikawa, Satoru
Matsui, Yasunori
Wachi, Satoshi
Yamaguchi, Hiroshi
Harashima, Nanae
Harada, Mamoru
description Because cancer is associated with aging, immunological features in the aged should be considered in anticancer immunotherapy. In this study, we investigated antitumor immunity in aged mice using a CT26 colon carcinoma model. The tumor growth of CT26 was accelerated in aged mice compared with that in young mice, but this difference was not observed in nude mice. The serum levels of IL-6 and TNF-α were higher in aged mice than those in young mice, irrespective of the CT26-bearing state. The in vitro induction of CT26-specific CTLs from aged mice that were vaccinated with doxorubicin (DTX)-treated CT26 cells was impaired. In vivo neutralization of IL-6, but not TNF-α, showed a tendency to restore the in vitro induction of CT26-specific CTLs from vaccinated aged mice. Analyses on tumor-infiltrating immune cells as early as day 5 after CT26 inoculation revealed that monocytic and granulocytic MDSCs preferentially infiltrated into tumor sites in aged mice compared with young mice. Alternatively, oral administration of Lentinula edodes mycelia (L.E.M.) extract, which has the potential to suppress inflammation in tumor-bearing hosts, decreased the serum levels of IL-6 in aged mice. When administration of L.E.M. extract was started 1 week earlier, CT26 growth was retarded in aged mice and the in vivo priming of tumor-specific CTLs was improved in CT26-vaccinated aged mice. These results indicate early infiltration of MDSCs is related to impaired immunity of aged hosts and that oral administration of L.E.M. extract can mitigate the impairment.
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Alternatively, oral administration of Lentinula edodes mycelia (L.E.M.) extract, which has the potential to suppress inflammation in tumor-bearing hosts, decreased the serum levels of IL-6 in aged mice. When administration of L.E.M. extract was started 1 week earlier, CT26 growth was retarded in aged mice and the in vivo priming of tumor-specific CTLs was improved in CT26-vaccinated aged mice. 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source MEDLINE; SpringerNature Journals; PubMed Central
subjects Administration, Oral
Age Factors
Aging
Animals
Cancer
Cancer Research
Cell Line, Tumor
Colonic Neoplasms - immunology
Cytokines
Drug dosages
Female
Humans
Immunology
Immunotherapy
Lentinula edodes
Lymphocytes
Medicine
Medicine & Public Health
Melanoma
Mice
Mice, Inbred BALB C
Mice, Nude
Oncology
Oral administration
Original
Original Article
Peptides
Reagents
Shiitake Mushrooms - metabolism
Shiitake Mushrooms - therapeutic use
University faculty
Vaccines
title Age-associated impairment of antitumor immunity in carcinoma-bearing mice and restoration by oral administration of Lentinula edodes mycelia extract
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