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Pubmed ID :21029969
Publication Date : //

Carcinoembryonic antigen-related cell adhesion molecule-1 regulates granulopoiesis by inhibition of granulocyte colony-stimulating factor receptor.


Although carcinoembryonic antigen-related cell adhesion molecule-1 (CEACAM1) is an activation marker for neutrophils and delays neutrophil apoptosis, the role of CEACAM1 in granulopoiesis and neutrophil-dependent host immune responses has not been investigated. CEACAM1 expression correlated with granulocytic differentiation, and Ceacam1(-/-) mice developed neutrophilia because of loss of the Src-homology-phosphatase-1 (SHP-1)-dependent inhibition of granulocyte colony-stimulating factor receptor (G-CSFR) signal transducer and activator of transcription (Stat3) pathway provided by CEACAM1. Moreover, Ceacam1(-/-) mice were hypersensitive to Listeria Monocytogenes (LM) infection with an accelerated mortality. Reintroduction of CEACAM1 into Ceacam1(-/-) bone marrow restored normal granulopoiesis and host sensitivity to LM infection, while mutation of its immunoreceptor tyrosine-based inhibitory motifs (ITIMs) abrogated this restoration. shRNA-mediated reduction of Stat3 amounts rescued normal granulopoiesis, attenuating host sensitivity to LM infection in Ceacam1(-/-) mice. Thus, CEACAM1 acted as a coinhibitory receptor for G-CSFR regulating granulopoiesis and host innate immune response to bacterial infections.

Authors : Pan Hao , Shively John E ,

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