Regulation of mannose receptor synthesis and turnover in mouse J774 macrophages.

Abstract:

:The mannose receptor, present on the plasma membrane of macrophages, promotes the internalization of glycoproteins and glycoconjugates via both endocytic and phagocytic pathways. The expression of this receptor is tightly modulated during monocyte/Mphi differentiation and cellular activation. We isolated clonal populations from murine J774 macrophage tumor cells, which differ in their surface expression of functional mannose receptors. To examine the potential mechanisms regulating receptor function in these cell lines, the interaction of receptor with ligand as well as receptor synthesis and degradation was analyzed. J774 clones with both high and low levels of mannose receptor activity were found to synthesize significant amounts of receptor protein, suggesting that the protein may be regulated at the level of synthesis and degradation. In J774 clones expressing very low receptor activity and protein, the half-life of mannose receptor molecules was substantially decreased. The evolution of multiple mechanisms modulating mannose receptor function may be critical in fine-tuning the role of this receptor in antigen processing and in scavenger and host defense functions.

journal_name

J Leukoc Biol

authors

Fiani ML,Beitz J,Turvy D,Blum JS,Stahl PD

doi

10.1002/jlb.64.1.85

subject

Has Abstract

pub_date

1998-07-01 00:00:00

pages

85-91

issue

1

eissn

0741-5400

issn

1938-3673

journal_volume

64

pub_type

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