Generation of a soluble IFN-gamma inducer by oxidation of galactose residues on macrophages.

Abstract:

:Depletion of macrophages from human peripheral blood mononuclear cells (PBMC) caused a marked decrease in galactose oxidase and sodium periodate, but not a calcium ionophore, stimulated Interferon-gamma (IFN-gamma) production. Reconstitution of such depleted cultures with galactose oxidase treated macrophages, but not lymphocytes, restored IFN-gamma levels to those of control nonfractionated PBMC. Thus, galactose oxidase seemed to act on macrophages which in turn stimulated lymphocyte production of IFN-gamma. Unlike human cells which have terminal galactose residues on glycoproteins, murine cell glycoproteins terminate their oligosaccharide component in the order N-acetyl-neuraminic acid followed by D-galactose, N-acetyl-glucosamine, and glycoprotein. Galactose oxidase or sodium periodate only activated murine macrophages to stimulate lymphocyte IFN-gamma production after exposing D-galactose residues by the removal of the terminal N-acetyl-neuraminic acid residues with neuraminidase. Removal of such exposed terminal galactose residues with beta-galactosidase inhibited the effect of galactose oxidase on murine macrophages. Taken together, these results strongly suggest that oxidation of terminal galactose residues on macrophages is the initial site of action of galactose oxidase and sodium periodate. Studies with Boyden chambers have shown that galactose oxidase-treated macrophages released a soluble factor which stimulates lymphocyte production of IFN-gamma. Based on these findings, it appears that the oxidation of terminal galactose residues on the surface of macrophages leads to the induction and transmission of a soluble signal for lymphocyte production of IFN-gamma.

journal_name

Cell Immunol

journal_title

Cellular immunology

authors

Antonelli G,Blalock JE,Dianzani F

doi

10.1016/0008-8749(85)90268-0

subject

Has Abstract

pub_date

1985-09-01 00:00:00

pages

440-6

issue

2

eissn

0008-8749

issn

1090-2163

pii

0008-8749(85)90268-0

journal_volume

94

pub_type

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