Chicken CD300a homolog is found on B lymphocytes, various leukocytes populations and binds to phospholipids.

Autor: Sperling B; Institute for Animal Physiology, Department of Veterinary Sciences, University of Munich, Veterinärstr. 13, Munich 80539, Germany., Viertlboeck BC; Institute for Animal Physiology, Department of Veterinary Sciences, University of Munich, Veterinärstr. 13, Munich 80539, Germany., Göbel TW; Institute for Animal Physiology, Department of Veterinary Sciences, University of Munich, Veterinärstr. 13, Munich 80539, Germany. Electronic address: goebel@lmu.de.
Jazyk: angličtina
Zdroj: Developmental and comparative immunology [Dev Comp Immunol] 2015 Jun; Vol. 50 (2), pp. 121-8. Date of Electronic Publication: 2015 Feb 10.
DOI: 10.1016/j.dci.2015.02.004
Abstrakt: The chicken CD300 cluster contains three genes that encode inhibitory, activating and soluble forms. In the present study, we have generated a monoclonal antibody against the inhibitory CD300L-B1 molecule. The mab 1D4 was specific for the CD300L-B1 form and showed no crossreactivity with the related CD300L-X1. Virtually all bursal cells expressed CD300L-B1, whereas only a small positive subset was found in thymus that was identified as thymic B cell subpopulation. In peripheral tissues, CD300L-B1 was found to be expressed on lymphocyte subpopulations in blood and spleen. Double immunofluorescence analysis with B- and T-cell specific markers identified these subsets as B lymphocytes. In addition, analysis of PBMC revealed that CD300L-B1 was also present on monocytes, heterophils, blood NK cells and in vitro differentiated macrophages. We utilized a reporter cell line in order to identify potential ligands of CD300L-B1. When several phospholipids were tested, only phosphatidylserine and phosphatidylethanolamine were found to trigger strong reaction of the reporter cells. The two phospholipids elicited a response only in CD300L-B1 reporter cells, but not in CD300L-X1 reporter cells. Moreover the interaction could be blocked with the specific mab. In conclusion, we provide evidence for the expression of chicken CD300L-B1 on immature and mature B cells, monocytes, heterophils, macrophages and NK cells and identify phosphatidylserine and phosphatidylethanolamine as CD300L-B1 ligands.
(Copyright © 2015 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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