Adhesion of human T cells to antigen-presenting cells through SIRPβ2-CD47 interaction costimulates T-cell proliferation

Laura Piccio, William Vermi, Kent S. Boles, Anja Fuchs, Carey A. Strader, Fabio Facchetti, Marina Cella, Marco Colonna

Research output: Contribution to journalArticle

57 Scopus citations

Abstract

Signal-regulatory proteins (SIRPs) are transmembrane glycoproteins belonging to the immunoglobulin (Ig) superfamily that are expressed in the immune and central nervous systems. SIRPα binds CD47 and inhibits the function of macrophages, dendritic cells, and granulocytes, whereas SIRPβ1 is an orphan receptor that activates the same cell types. A recently identified third member of the SIRP family, SIRPβ2, is as yet uncharacterized in terms of expression, specificity, and function. Here, we show that SIRPβ2 is expressed on T cells and activated natural killer (NK) cells and, like SIRPα, binds CD47, mediating cell-cell adhesion. Consequently, engagement of SIRPβ2 on T cells by CD47 on antigen-presenting cells results in enhanced antigen-specific T-cell proliferation.

Original languageEnglish
Pages (from-to)2421-2427
Number of pages7
JournalBlood
Volume105
Issue number6
DOIs
StatePublished - Mar 15 2005

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