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Eur J Immunol. 2009 Dec;39(12):3315-22. doi: 10.1002/eji.200939684.

Membrane protein GARP is a receptor for latent TGF-beta on the surface of activated human Treg.

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1
de Duve Institute, Université catholique de Louvain, Brussels, Belgium.

Abstract

Human Treg and Th clones secrete the latent form of TGF-beta, in which the mature TGF-beta protein is bound to the latency-associated peptide (LAP), and is thereby prevented from binding to the TGF-beta receptor. We previously showed that upon TCR stimulation, human Treg clones but not Th clones produce active TGF-beta and bear LAP on their surface. Here, we show that latent TGF-beta, i.e. both LAP and mature TGF-beta, binds to glycoprotein A repetitions predominant (GARP), a transmembrane protein containing leucine rich repeats, which is present on the surface of stimulated Treg clones but not on Th clones. Membrane localization of latent TGF-beta mediated by binding to GARP may be necessary for the ability of Treg to activate TGF-beta upon TCR stimulation. However, it is not sufficient as lentiviral-mediated expression of GARP in human Th cells induces binding of latent TGF-beta to the cell surface, but does not result in the production of active TGF-beta upon stimulation of these Th cells.

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PMID:
19750484
DOI:
10.1002/eji.200939684
[Indexed for MEDLINE]
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