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Monoclonal antibodies against GARP/TGF-β1 complexes inhibit the immunosuppressive activity of human regulatory T cells in vivo.

Abstract：

:Regulatory T cells (Tregs) are essential to prevent autoimmunity, but excessive Treg function contributes to cancer progression by inhibiting antitumor immune responses. Tregs exert contact-dependent inhibition of immune cells through the production of active transforming growth factor-β1 (TGF-β1). On the Treg cell surface, TGF-β1 is in an inactive form bound to membrane protein GARP and then activated by an unknown mechanism. We demonstrate that GARP is involved in this activation mechanism. Two anti-GARP monoclonal antibodies were generated that block the production of active TGF-β1 by human Tregs. These antibodies recognize a conformational epitope that requires amino acids GARP137-139 within GARP/TGF-β1 complexes. A variety of antibodies recognizing other GARP epitopes did not block active TGF-β1 production by Tregs. In a model of xenogeneic graft-versus-host disease in NSG mice, the blocking antibodies inhibited the immunosuppressive activity of human Tregs. These antibodies may serve as therapeutic tools to boost immune responses to infection or cancer via a mechanism of action distinct from that of currently available immunomodulatory antibodies. Used alone or in combination with tumor vaccines or antibodies targeting the CTLA4 or PD1/PD-L1 pathways, blocking anti-GARP antibodies may improve the efficiency of cancer immunotherapy.

journal_name

Sci Transl Med

journal_title

Science translational medicine

authors

Cuende J,Liénart S,Dedobbeleer O,van der Woning B,De Boeck G,Stockis J,Huygens C,Colau D,Somja J,Delvenne P,Hannon M,Baron F,Dumoutier L,Renauld JC,De Haard H,Saunders M,Coulie PG,Lucas S

doi

10.1126/scitranslmed.aaa1983

subject

Has Abstract

pub_date

2015-04-22 00:00:00

pages

284ra56

issue

284

eissn

1946-6234

issn

1946-6242

pii

7/284/284ra56

journal_volume

7

pub_type

杂志文章

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