Identification of an intercellular cell adhesion molecule-1 homologue from grass carp: Evidence for its involvement in the immune cell adhesion in teleost.
Intercellular cell adhesion molecule-1 (ICAM-1) is a single-chain transmembrane glycoprotein which plays key roles in transendothelial migration of leukocytes and interaction between antigen presenting cells and T cells. In teleost, information of cell adhesion-related molecules is still lacking. In this study, we identified a gene from grass carp sharing similar exon and intron organization with human ICAM-1. Cloning and in silico analysis of its homologues in zebrafish and other two cyprinid fishes, respectively demonstrated the existence of the gene in these fishes. Moreover, the molecular features of these genes in fishes were conserved compared with human ICAM-1. In grass carp, the transcripts of this gene were detected with high levels in heart and liver and its mRNA expression in headkidney leukocytes was induced by Il-1β. Overexpression of this molecule in COS-7 cells could increase the adhesion of the cells with grass carp peripheral blood lymphocytes (PBLs), and the adhesion was further enhanced by lipopolysaccharide stimulation on PBLs. Further studies revealed that the mRNA levels of lymphocyte function-associated antigen-1, a ligand for ICAM-1, were much higher in the PBLs adhering to the COS-7 cells with overexpressing this molecule than in the PBLs alone. These results collectively showed that the newly cloned cDNA encodes grass carp intercellular cell adhesion molecule-1 (Icam-1) and it can mediate the adhesion of PBLs. This provides functional evidence for the existence of Icam-1 in teleost and will facilitate investigation on the transendothelial migration of leukocytes in fish species.
['Wei|He|H|', 'Lv|Mengyuan|M|', 'Wen|Chao|C|', 'Zhang|Anying|A|', 'Yang|Kun|K|', 'Zhou|Hong|H|', 'Wang|Xinyan|X|']
D000818:Animals D019556:COS Cells D002347:Carps D002448:Cell Adhesion D002522:Chlorocebus aethiops D003001:Cloning, Molecular D018076:DNA, Complementary D029941:Fish Proteins D006801:Humans D018799:Intercellular Adhesion Molecule-1 D007963:Leukocytes, Mononuclear D008070:Lipopolysaccharides D008214:Lymphocytes D010802:Phylogeny D012333:RNA, Messenger D016415:Sequence Alignment D015398:Signal Transduction
Intercellular cell adhesion molecule-1 Cell adhesion Teleost Functional identification