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Hypoxia induces T-cell apoptosis by inhibiting chemokine C receptor 7 expression: the role of adenosine receptor A(2).

Abstract：

:Hypoxia is a major characteristic of the tumor microenvironment, and its effects on immune cells are proposed to be important factors for the process of tumor immune escape. It has been reported that hypoxia affects the function of dendritic cells and the antitumor function of T cells. Here we discuss the effects of hypoxia on T-cell survival. Our results showed that hypoxia induced apoptosis of T cells. Adenosine and adenosine receptors (AR) are important to the hypoxia-related signaling pathway. Using AR agonists and antagonists, we demonstrated that hypoxia-induced apoptosis of T cells was mediated by A(2a )and A(2b) receptors. Furthermore, we are the first, to our knowledge, to report that hypoxia significantly inhibited the expression of chemokine C receptor 7 (CCR7) of T cells via the A(2)R signal pathway, perhaps representing a mechanism of hypoxia-induced apoptosis of T cells. Collectively, our research demonstrated that hypoxia induces T-cell apoptosis by the A(2)R signaling pathway partly by suppressing CCR7. Blocking the A(2)R signaling pathway and/or activation of CCR7 can increase the anti-apoptosis function of T cells and may become a new strategy to improve antitumor potential.

journal_name

Cell Mol Immunol

journal_title

Cellular & molecular immunology

authors

Sun J,Zhang Y,Yang M,Zhang Y,Xie Q,Li Z,Dong Z,Yang Y,Deng B,Feng A,Hu W,Mao H,Qu X

doi

10.1038/cmi.2009.105

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

77-82

issue

1

eissn

1672-7681

issn

2042-0226

pii

cmi2009105

journal_volume

7

pub_type

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