Journal
ANNUAL REVIEW OF IMMUNOLOGY, VOL 32
Volume 32, Issue -, Pages 25-50Publisher
ANNUAL REVIEWS
DOI: 10.1146/annurev-immunol-032713-120142
Keywords
paired receptor; CD47; SIRP alpha; phagocytosis; cancer; inflammation
Categories
Funding
- Medical Research Council [G9826026] Funding Source: researchfish
- MRC [G9826026] Funding Source: UKRI
- Medical Research Council [G9826026] Funding Source: Medline
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CD47 is a broadly expressed membrane protein that interacts with the myeloid inhibitory immunoreceptor SIRP alpha (also termed CD172a or SHPS-1). SIRP alpha is the prototypic member of the SIRP paired receptor family of closely related SIRP proteins. Engagement of SIRP alpha by CD47 provides a downregulatory signal that inhibits host cell phagocytosis, and CD47 therefore functions as a don't-eat-me signal. Here, we discuss recent structural analysis of CD47-SIRP alpha interactions and implications of this for the function and evolution of SIRP alpha and paired receptors in general. Furthermore, we review the proposed roles of CD47-SIRP alpha interactions in phagocytosis, (auto) immunity, and host defense, as well as its potential significance as a therapeutic target in cancer and inflammation and for improving graft survival in xenotransplantation.
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