Interferon-gamma produced by interleukin-12-activated tumor infiltrating CD8+T cells directly induces apoptosis of mouse hepatocellular carcinoma.

Abstract:

BACKGROUND/AIMS:Interleukin-12 (IL-12), a cytokine with antitumor activity, was examined for the suppressive effect on hepatocellular carcinoma (HCC) in mouse model, and its mechanism of antitumor activity was analyzed. METHODS:Mice implanted with MIH-2 HCC cells were treated with recombinant mouse IL-12 (500 ng/mouse). Involvement of CD4(+), CD8(+), NK cells and interferon (IFN)-gamma on tumor suppression by IL-12 was examined by treatment of mice with each antibody. Interferon-gamma (IFN-gamma) production by tumor infiltrating cells was analyzed by immunofluorescence microscopy and flow cytometric analysis. Signal transduction for apoptosis induction was examined by immunoblot analysis. RESULTS:The growth of implanted MIH-2 tumors was significantly suppressed by IL-12 and the suppression was inhibited by depletion of CD8(+)T cells. IL-12 treatment caused numerous IFN-gamma-producing CD8(+)T cells to infiltrate into MIH-2 tumors. Antitumor activity of IL-12 was blocked by treating mice with anti-IFN-gamma mAb. CD8(+)T cells from IL-12-treated mice attached to MIH-2 cells and produced IFN-gamma in vitro. Cell attachment might be associated with intercellular adhesion molecule-1 induced by IFN-gamma. In vitro treatment with IFN-gamma induced apoptosis of MIH-2 cells via a mitochondria-dependent pathway. CONCLUSIONS:IL-12 suppressed HCC growth in mouse model. IFN-gamma produced by IL-12-activated tumor-infiltrating CD8(+)T cells directly induced apoptosis of HCC cells.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Komita H,Homma S,Saotome H,Zeniya M,Ohno T,Toda G

doi

10.1016/j.jhep.2006.05.018

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

662-72

issue

5

eissn

0168-8278

issn

1600-0641

pii

S0168-8278(06)00303-5

journal_volume

45

pub_type

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