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Expression of gamma‐interferon receptor in murine bone marrow‐derived macrophages associated with macrophage differentiation: Evidence of gamma‐interferon receptors in the regulation of macrophage proliferation
Author(s) -
Chen Ben D.M.,
Chou TaHsu,
Ratanatharathorn Voravit
Publication year - 1987
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041330215
Subject(s) - receptor , biology , macrophage , haematopoiesis , bone marrow , interferon gamma , receptor expression , interferon , microbiology and biotechnology , cytokine , immunology , in vitro , stem cell , biochemistry
The effect of purified, recombinant murine gamma interferon (IFN‐γ) on the regulation of macrophage proliferation induced by colony‐stimulating factor 1 (CSF‐1) was investigated. Although both hemopoietic stem cells (GM‐CFC) and tissue‐derived peritoneal exudate macrophages (PEM) proliferated in response to CSF‐1, the more mature PEM were much more sensitive to an antiproliferative effect of IFN‐γ. The role of IFN‐γ receptor expression and its relationship to growth inhibition was examined. Bone marrow cells as a whole did not exhibit an appreciable amount of IFN‐γ receptor binding activity. Likewise, nonadherent (NA) cells derived from CSF‐1‐stimulated bone marrow cultures displayed low levels of IFN‐γ receptor binding activity. On the contrary, more mature adherent (AD) cells (monocytes/macrophages) from the same culture exhibited high levels of IFN‐γ receptor binding activity which continued to increase with culture time. The elevated IFN‐γ binding activity is due to an increase in total receptor number rather than the binding affinity as judged by Scatchard analysis. Similar to the relationship between PEM and GM‐CFC, more mature AD cells were also more susceptible to the inhibitory effect of IFN‐γ on CSF‐1‐induced proliferation than their less mature NA counterparts. The fact that the sensitivity to IFN‐γ correlated well with the expression of existing IFN‐γ receptors strongly suggests that the inhibitory effect is mediated through IFN‐γ receptors. This study shows that the expression of IFN‐γ receptors in mononuclear phagocytes may not only represent one of the phenotypic parameters acquired by the growing macrophages during the process of differentiation, but may play some role in controlling proliferation.