BLIMP-1: trigger for differentiation of myeloid lineage.
B lymphocyte-induced maturation protein-1 (BLIMP-1 or PRDI-BF1) is induced when bone marrow-derived progenitors differentiate in response to macrophage-colony stimulating factor (M-CSF) and is present in peripheral blood monocytes and granulocytes. BLIMP-1 is also induced during differentiation of U937 and HL-60 cells into macrophages or granulocytes. Induction of BLIMP-1 mRNA during macrophage differentiation of U937 and HL-60 shows a biphasic pattern. Overexpression of BLIMP-1 is sufficient to initiate macrophage differentiation of U937 cells whereas blocking endogenous BLIMP-1 inhibits differentiation. One target of BLIMP-1-dependent transcriptional repression in U937 cells is c-myc, providing an explanation for cessation of cell division. Thus BLIMP-1 is a key regulator of terminal differentiation in two separate hematopoietic lineages: myeloid cells and B lymphocytes.
Chang
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Integrated Program in Cellular, Molecular and Biophysical Studies, Columbia University, New York, NY 10032, USA.
Angelin-Duclos
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Calame
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D002454:Cell Differentiation; D019070:Cell Lineage; D015870:Gene Expression; D018922:HL-60 Cells; D006801:Humans; D000074462:Positive Regulatory Domain I-Binding Factor 1; D016271:Proto-Oncogene Proteins c-myc / Q000235:genetics; D012097:Repressor Proteins; D014157:Transcription Factors / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D020298:U937 Cells; D016335:Zinc Fingers
D016271:Proto-Oncogene Proteins c-myc; D012097:Repressor Proteins; D014157:Transcription Factors; C087042:PRDM1 protein, human; D000074462:Positive Regulatory Domain I-Binding Factor 1