Adenosine A2B receptor antagonist PSB603 suppresses tumor growth and metastasis by inhibiting induction of regulatory T cells

被引:22
|
作者
Kaji, Wakako [1 ]
Tanaka, Satomi [1 ]
Tsukimoto, Mitsutoshi [1 ]
Kojima, Shuji [1 ]
机构
[1] Tokyo Univ Sci, Fac Pharmaceut Sci, Noda, Chiba 2788510, Japan
来源
JOURNAL OF TOXICOLOGICAL SCIENCES | 2014年 / 39卷 / 02期
关键词
Adenosine; A(2B) receptor; Regulatory T cells; Tumor immunity; Melanoma; ATP RELEASE; TGF-BETA; ACTIVATION; DIFFERENTIATION; IRRADIATION; MECHANISM; MICE;
D O I
10.2131/jts.39.191
中图分类号
R99 [毒物学(毒理学)];
学科分类号
100405 ;
摘要
Regulatory T cells (Treg) play a role in suppression of immune response, including antitumor immunity. We have recently reported that treatment of naive CD4 T cells with adenosine A(2B) receptor antagonist PSB603 under Treg-skewing conditions inhibits expression of Foxp3, a marker of differentiation to Treg, without blocking IL-2 production or CD25 expression, which are activation markers, in CD4 T cells. We hypothesized that PSB603 suppresses cancer growth and metastasis by inhibiting induction of Treg, thereby facilitating anti-tumor immunity. In this study, we first examined the effect of PSB603 on tumor growth in B16 melanoma-bearing C57BL/6 mice. Administration of PSB603 significantly suppressed the increase of tumor volume as well as the increase of Treg population in these mice. The populations of CD4 and CD8 T cells were higher and splenic lymphocyte-mediated cytotoxicity towards B16 melanoma was significantly increased in PSB603-treated mice. We confirmed that PSB603 did not reduce the viability of B16 melanoma cells in vitro. Moreover, we also examined the effect of PSB603 on tumor metastasis in pulmonary metastasis model mice intravenously injected with B16 melanoma cells. The metastasis was also suppressed in PSB603-treated mice, in which the population of Treg was significantly lower. Overall, our results suggest that A2B receptor antagonist PSB603 enhances anti-tumor immunity by inhibiting differentiation to Treg, resulting in a delay of tumor growth and a suppression of metastasis.
引用
收藏
页码:191 / 198
页数:8
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