The interferon-inducible gene, Ifi204, is transcriptionally activated in response to M-CSF, and its expression favors macrophage differentiation in myeloid progenitor cells.
The interferon-inducible (Ifi)204 gene was isolated as a macrophage-colony stimulating factor (M-CSF)-responsive gene using a gene trap approach in the myeloid interleukin-3 (IL-3)-dependent FD-Fms cell line, which differentiates in macrophages in response to M-CSF. Here, we show that Ifi204 was transcriptionally activated in response to M-CSF, and FD-Fms cells decreased their growth and committed toward a macrophage morphology; this induction was abrogated when the differentiation signal of the M-CSF receptor was blocked; the Ifi204 gene was also induced during macrophage differentiation controlled by leukemia inhibitory factor; and the Ifi204 gene is expressed in different mature monocyte/macrophage cells. Finally, we showed that enforced expression of Ifi204 strongly decreased IL-3- and M-CSF-dependent proliferation and conversely, favored macrophage differentiation of FD-Fms cells in response to M-CSF. Altogether, these results demonstrate that the Ifi204 gene is activated during macrophage development and suggest that the Ifi204 protein may act as a regulator of the balance between proliferation and differentiation. Moreover, this study suggests that other members of the Ifi family might act as regulators of hematopoiesis under the control of hemopoietic cytokines.
Dauffy
Jérémy
J
Centre de Génétique Moléculaire et Cellulaire, UMR CNRS 5534, Villeurbanne Cedex, France.
Mouchiroud
Guy
G
Bourette
Roland P
RP
D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects* / Q000276:immunology; D002460:Cell Line; D049109:Cell Proliferation / Q000187:drug effects; D005786:Gene Expression Regulation / Q000187:drug effects* / Q000276:immunology; D006410:Hematopoiesis / Q000235:genetics / Q000276:immunology; D006801:Humans; D007377:Interleukin-3 / Q000276:immunology / Q000378:metabolism; D015850:Interleukin-6 / Q000276:immunology / Q000378:metabolism; D053605:Leukemia Inhibitory Factor; D008262:Macrophage Activation / Q000187:drug effects / Q000235:genetics / Q000276:immunology; D016173:Macrophage Colony-Stimulating Factor / Q000276:immunology / Q000494:pharmacology*; D008264:Macrophages / Q000276:immunology / Q000378:metabolism*; D051379:Mice; D023461:Myeloid Progenitor Cells / Q000276:immunology / Q000378:metabolism*; D009687:Nuclear Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D010750:Phosphoproteins / Q000096:biosynthesis* / Q000235:genetics / Q000276:immunology; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics / Q000276:immunology; D014158:Transcription, Genetic / Q000187:drug effects / Q000276:immunology
C489664:Ifi16 protein, mouse; D007377:Interleukin-3; D015850:Interleukin-6; C507837:LIF protein, human; D053605:Leukemia Inhibitory Factor; C507838:Lif protein, mouse; D009687:Nuclear Proteins; D010750:Phosphoproteins; D016173:Macrophage Colony-Stimulating Factor