Abstract
Carcinoembryonic antigen-related cell adhesion molecule (CEACAM1), the primordial member of the carcinoembryonic antigen (CEA) family, functions as a MHC-independent natural killer (NK) cell inhibitory receptor, regulates T and B cell proliferation, and induces dendritic cell (DC) maturation. Despite these fundamental functions, CEACAM1 and most of the CEA family members differ significantly in primates and rodents. A number of diverse murine and human pathogens use CEACAM1 as a cellular receptor, indicating that the observed species-specific differences are the result of divergent molecular pathogen/host coevolution. To gain deeper insight into its evolution and function, we cloned CEACAM1 cDNA from cattle as a representative of a third mammalian order. Bovine CEACAM1 differs considerably from rodent and primate CEACAM1 due to deletion of the B domain exon which was most likely caused by insertion of LINE/SINE sequences and reveals alternative splicing within the transmembrane exon. However, the characteristic long and short isoforms exist which contain or lack the typical immunoreceptor tyrosine-based inhibitory motifs (ITIM) in their cytoplasmic tails, respectively. Bovine peripheral blood lymphocytes (PBL) express only ITIM...Continue Reading
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