The mer receptor tyrosine kinase: expression and function suggest a role in innate immunity.

Abstract:

:The mer receptor tyrosine kinase mediates phagocytosis of apoptotic cells and modulates cytokine production; it is also required for prevention of systemic autoimmune disease. Using a mer-specific antibody, we have confirmed the presence of mer on macrophages and now report its expression on NK cells, NKT cells, and dendritic cells (DC). We found that DC do not require mer for ingestion of apoptotic cells, as DC from mer-deficient mice phagocytose apoptotic cells normally. Mer was observed in splenic sections on cells outside follicular areas, probably representing DC and macrophages. Mer apparently participates in NKT-cell antigen-induced signaling, as NKT cells from mer-deficient mice evinced much lower cytokine production after in vivo alpha-galactosylceramide stimulation; this defect was intrinsic to the mer-deficient NKT cells. Taken together, these studies show mer expression on cells of the innate immune system. Mer, through its binding of lipid antigens, may not only mediate ingestion of apoptotic cells, but also signal events in NK cells, NKT cells, and DC.

journal_name

Eur J Immunol

authors

Behrens EM,Gadue P,Gong SY,Garrett S,Stein PL,Cohen PL

doi

10.1002/eji.200324076

keywords:

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

2160-7

issue

8

eissn

0014-2980

issn

1521-4141

journal_volume

33

pub_type

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