Volume 14, Issue 8 pp. 2132-2143

Involvement of HAb18G/CD147 in T cell activation and immunological synapse formation

Jinsong Hu

Jinsong Hu

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

These authors contributed equally to this study.

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Nana Dang

Nana Dang

State Key Laboratory of Cancer Biology, Department of Biochemistry and Molecular Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

These authors contributed equally to this study.

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Hui Yao

Hui Yao

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

These authors contributed equally to this study.

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Yu Li

Yu Li

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

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Hongxin Zhang

Hongxin Zhang

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

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Xiangmin Yang

Xiangmin Yang

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

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Jing Xu

Jing Xu

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

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Huijie Bian

Huijie Bian

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

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Jinliang Xing

Jinliang Xing

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

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Ping Zhu

Corresponding Author

Ping Zhu

Department of Clinical Immunology, Xijing Hospital, Fourth Military Medical University, Xi’an, People’s Republic of China

Correspondence to: Zhinan CHEN, Ping ZHU,
Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an 710032, People’s Republic of China.
Tel.: 1186(29)84774547
Fax: 1186(29)83226349
E-mail: [email protected], [email protected]Search for more papers by this author
Zhinan Chen

Corresponding Author

Zhinan Chen

State Key Laboratory of Cancer Biology, Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an, People’s Republic of China

Correspondence to: Zhinan CHEN, Ping ZHU,
Cell Engineering Research Centre & Department of Cell Biology, Fourth Military Medical University, Xi’an 710032, People’s Republic of China.
Tel.: 1186(29)84774547
Fax: 1186(29)83226349
E-mail: [email protected], [email protected]Search for more papers by this author
First published: 15 January 2010
Citations: 25

Abstract

HAb18G/CD147, a glycoprotein of the immunoglobulin super-family (IgSF), is a T cell activation-associated molecule. In this report, we demonstrated that HAb18G/CD147 expression on both activated CD4+ and CD8+ T cells was up-regulated. In vitro cross-linking of T cells with an anti-HAb18G/CD147 monoclonal antibody (mAb) 5A12 inhibited T cells proliferation upon T cell receptor stimulation. Such co-stimulation inhibited T cell proliferation by down-regulating the expression of CD25 and interleukin-2 (IL-2), decreased production of IL-4 but not interferon-γ. Laser confocal imaging analysis indicated that HAb18G/CD147 was recruited to the immunological synapse (IS) during T cell activation; triggering HAb18G/CD147 on activated T cells by anti-HAb18G/CD147 mAb 5A12 strongly dispersed the formation of the IS. Further functional studies showed that the ligation of HAb18G/CD147 with mAb 5A12 decreased the tyrosine phosphorylation and intracellular calcium mobilization levels of T cells. Through docking antibody–antigen interactions, we demonstrated that the function of mAb 5A12 is tightly dependent on its specificity of binding to N-terminal domain I, which plays pivotal role in the oligomerization of HAb18G/CD147. Taken together, we provide evidence that HAb18G/CD147 could act as a co-stimulatory receptor to negatively regulate T cell activation and is functionally linked to the formation of the IS.

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