Human monocyte cell line (U937) releases suppressive IgG-binding factor(s).

Abstract:

:Fc gamma receptor-bearing U937 cells, when incubated in serum-free buffer, were found to release spontaneously a suppressor material for pokeweed mitogen-drigen IgG synthesis which could be retained on Sepharose 4B-IgG immunosorbents. Immunosorbents coupled with IgM or F (ab')2 fragments of IgG were unable to retain the inhibitory activity of U937-derived material, suggesting a binding specificity for the Fc gamma fragment of IgG. This suppressor material corresponds therefore by definition to an IgG-binding factor (IgG-BF). The mechanism for in vitro suppression of the antibody response by U937-derived IgG-BF was investigated. It did not interfere with cell proliferation and displayed maximum effect when added at day 3 of the culture period. Tested for its effect on IgG, IgM and IgA synthesis, IgG-BF suppressed antibody production following a pattern specific for IgG. Finally gel filtration of the suppressor material gave rise to two peaks of inhibitory activity with an apparent molecular mass comprised between 30 to 40 kDa and 60 to 73 kDa, respectively.

journal_name

Eur J Immunol

authors

Calvo CF,Watanabe S,Métivier D,Senik A

doi

10.1002/eji.1830160106

subject

Has Abstract

pub_date

1986-01-01 00:00:00

pages

25-30

issue

1

eissn

0014-2980

issn

1521-4141

journal_volume

16

pub_type

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