Macrophage-colony stimulating factor is required for the production of neutrophil-promoting activity by mouse embryo fibroblasts deficient in G-CSF and GM-CSF.

Abstract:

:G-CSF and GM-CSF play important roles in regulating neutrophil production, survival, differentiation, and function. However, we have shown previously that G-CSF/GM-CSF double-deficient [knockout (KO)] mice still develop a profound neutrophilia in bone marrow and blood after infection with Candida albicans. This finding suggests the existence of other systems, which can regulate emergency neutrophil production. We have now developed an "in vitro" technique to detect and characterize a neutrophil-promoting activity (NPA) in the media conditioned by mouse embryonic fibroblasts (MEFs) derived from G-CSF(-/-)/GM-CSF(-/-) mice. NPA is produced in vitro by the MEFs after stimulation with LPS or heat-inactivated C. albicans. Although M-CSF added directly to bone marrow cultures does not sustain granulocyte production, our studies indicate that production of NPA requires activation of the M-CSF receptor (c-fms). First, G-CSF(-/-)/GM-CSF(-/-) MEFs produce high levels of NPA after stimulation with LPS or C. albicans, and G-CSF/GM-CSF/M-CSF triple-KO MEFs do not. Second, the production of NPA by the G-CSF(-/-)/GM-CSF(-/-) MEFs is reduced significantly upon incubation with neutralizing antibodies to M-CSF or c-fms. Third, NPA production by G-CSF(-/-)/GM-CSF(-/-)/M-CSF(-/-) fibroblasts is enhanced by supplementing culture medium with M-CSF. Thus, stimulation of c-fms by M-CSF is a prerequisite for the production of NPA.

journal_name

J Leukoc Biol

authors

Zhang HH,Basu S,Wu F,Begley CG,Saris CJ,Dunn AR,Burgess AW,Walker F

doi

10.1189/jlb.0107023

subject

Has Abstract

pub_date

2007-10-01 00:00:00

pages

915-25

issue

4

eissn

0741-5400

issn

1938-3673

pii

jlb.0107023

journal_volume

82

pub_type

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