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. 1985 Oct;82(20):6937–6941. doi: 10.1073/pnas.82.20.6937

Developmental regulation of c-myb in normal myeloid progenitor cells.

S P Duprey, D Boettiger
PMCID: PMC390803  PMID: 2413449

Abstract

Hematopoietic tissues and some leukemic cell lines express elevated levels of c-myb transcripts. We have separated a subpopulation of chicken embryo yolk sac cells that represents about 5% of the yolk sac hematopoietic cells and appears to contain all of the detectable c-myb transcripts. The level of myb expression in this cell population is higher than previously reported for any normal cell population and is in the range of that found in cells transformed by avian myeloblastosis virus and E26 virus. Since the myb gene probe used also detects full-length viral transcripts as well as the v-myb mRNA, it appears that the level of expression of c-myb in this normal population may exceed that found in some transformed cell populations that depend on v-myb to maintain the transformed phenotype. This c-myb-expressing cell population has been identified as primarily M-CFC, the committed progenitor for the macrophage lineage. As cells differentiate to the promonocyte stage there is an abrupt decrease in c-myb expression of greater than 100 fold. These studies thus describe a normal cell population that expresses c-myb at levels similar to the level of v-myb in cells that depend on v-myb for the maintenance of their transformed phenotype. Furthermore, these studies provide direct evidence for the developmental regulation of c-myb during the process of normal macrophage differentiation.

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