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Cimetidine suppresses lung tumor growth in mice through proapoptosis of myeloid-derived suppressor cells.

Abstract：

:Cimetidine, a histamine type-2 receptor antagonist, is known to inhibit the growth of several tumors in human and animals, however the mechanism of action underlying this effect remains largely unknown. Here, in the mice model of 3LL lung tumor, cimetidine showed significant inhibition of tumor growth. However, an in vitro study demonstrated that cimetidine showed no effect on proliferation, survival, migration and invasion of 3LL cells. We found that cimetidine reduced CD11b(+)Gr-1(+) myeloid derived-suppressive cell (MDSC) accumulation in spleen, blood and tumor tissue of tumor-bearing mice. In vitro coculture assay showed that cimetidine reversed MDSC-mediated T-cell suppression, and improved IFN-γ production. Further investigation demonstrated that the NO production and arginase I expression of MDSCs were reduced, and MDSCs prone to apoptosis by cimetidine treatment. However, MDSC differentiation was not affect by cimetidine. Importantly, although histamine H2 receptor was expressed in MDSC surface, histamine could not reverse the proapoptosis of cimetidine. Moreover, famotidine also did not have this capacity. We found that cimetidine could induce Fas and FasL expression in MDSC surface, and sequentially regulate caspase-dependent apoptosis pathway. Thus, these findings revealed a novel mechanism for cimetidine to inhibit tumor via modulation of MDSC apoptosis.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Zheng Y,Xu M,Li X,Jia J,Fan K,Lai G

doi

10.1016/j.molimm.2012.10.035

subject

Has Abstract

pub_date

2013-05-01 00:00:00

pages

74-83

issue

1

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(12)00449-X

journal_volume

54

pub_type

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