A novel temporal expression pattern of three C/EBP family members in differentiating myelomonocytic cells - PubMed (original) (raw)
. 1992 Oct 1;80(7):1725-35.
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- PMID: 1391942
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A novel temporal expression pattern of three C/EBP family members in differentiating myelomonocytic cells
L M Scott et al. Blood. 1992.
Free article
Abstract
Members of the CCAAT/enhancer binding protein (C/EBP) family have been shown to regulate the terminal differentiation of adipocytes and hepatocytes. In these cell lineages, high levels of C/EBP alpha are found only in mature, nondividing cells. Using Western blotting and immunohistochemical staining, we have determined the temporal order of expression for C/EBP alpha, C/EBP beta, and C/EBP delta in differentiating myelomonocytic marrow cells. These studies show a unique temporal pattern of C/EBP isoform expression in the myeloid lineage. In particular, C/EBP alpha expression is very high in proliferative myelomonocytic cells, and diminishes during phenotypic maturation. While we have detected C/EBP alpha, C/EBP beta, and C/EBP delta in multiple myeloid leukemia cell lines, and C/EBP alpha in normal myeloid cells and in de novo human myeloid leukemias, we have not detected these C/EBP isoforms in either erythroid or lymphoid cells. Finally, we show that C/EBP alpha, C/EBP beta, and C/EBP delta protein and messenger RNA levels correlate in maturing granulocytic cells. The formation of tissue-specific combinations of C/EBP homodimers and heterodimers may allow this family of transcription factors to regulate different sets of genes in adipocytes, hepatocytes, and myelomonocytes.
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