Deregulated expression of c-myc in megakaryocytes of transgenic mice increases megakaryopoiesis and decreases polyploidization

Alexander Thompson, Ying Zhang, Dimitry Kamen, Carl W. Jackson, Robert Cardiff, Katya Ravid

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42 Scopus citations


Platelets, essential for vascular integrity and hemostasis, fragment from polyploid megakaryocytes, characterized by their endomitotic cell cycle. We studied the influence of overexpression of c-myc oncogene on megakaryopoiesis and endomitosis in vivo, using transgenic mice carrying c- myc fused to the estrogen receptor under the control of the platelet factor 4 (PF4) megakaryocyte-specific promoter. The rationale behind this strategy was to obtain controlled overexpression of an active c-Myc, depending on the estrogen level in the mouse circulation. Analysis of these transgenic mice revealed that the bone marrow of female transgenic mice or of estrogen- injected male transgenic mice, but not of age-matched transgenic males nor nontransgenic females, contained frequent immature myeloid cells and an increased number of megakaryocytes. Deregulated expression of c-Myc shifted the normal ploidy profile of megakaryocytes due to a significant increase in proliferating megakaryocytes and a decrease in the fraction of ploidizing cells. These transgenic mice represent a novel in vivo model for a Myc- induced myeloproliferative disorder which can be controlled.

Original languageEnglish (US)
Pages (from-to)22976-22982
Number of pages7
JournalJournal of Biological Chemistry
Issue number38
StatePublished - Sep 30 1996


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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