C1qR(P), a myeloid cell receptor in blood, is predominantly expressed on endothelial cells in human tissue.

Abstract:

:C1qR(P) is a type I cell surface glycoprotein that has been shown to enhance ingestion of suboptimally opsonized targets by phagocytes in vitro. In this study, we developed and characterized polyclonal antibodies to study the tissue distribution of this receptor targeted to either the N- or C-terminal portion of the molecule. C1qR(P) was detected in vascular endothelial cells and in a subset of pyramidal neurons in the brain, as well as neutrophils, but it was absent in most tissue macrophages. Analysis of in vitro differentiation of blood monocytes to dendritic cells demonstrated a down-regulation of the receptor as monocytes differentiate to dendritic cells, providing a possible explanation for the lack of reactivity of these cells in tissue. The predominant presence of C1qR(P) in endothelial cells, while compatible with a phagocytic role in host defense and/or clearance of cellular material, suggests other possible novel roles for this receptor.

journal_name

J Leukoc Biol

authors

Fonseca MI,Carpenter PM,Park M,Palmarini G,Nelson EL,Tenner AJ

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

793-800

issue

5

eissn

0741-5400

issn

1938-3673

journal_volume

70

pub_type

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