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Related Collections Hematopoiesis and Stem Cells Red Cells Cell Cycle Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 15 October 2000, Vol. 96, No. 8, pp. 2755-2764 HEMATOPOIESIS Manipulating the onset of cell cycle withdrawal in differentiated erythroid cells with cyclin-dependent kinases and inhibitors Igor Matushansky, Farshid Radparvar, and Arthur I. Skoultchi From the Department of Cell Biology, Albert Einstein College of Medicine, Bronx, NY. Terminal differentiation of erythroid cells results in terminal cell divisions followed by irreversible cell cycle withdrawal of hemoglobinized cells. The mechanisms leading to cell cycle withdrawal were assessed in stable transfectants of murine erythroleukemia cells, in which the activities of cyclin-dependent kinases (CDKs) and CDK inhibitors (CDKIs) could be tightly regulated during differentiation. Cell cycle withdrawal of differentiating cells is mediated by induction of several CDKIs, thereby leading to inhibition of CDK2 and CDK4. Manipulation of CDK activity in differentiating cells demonstrates that the onset of cell cycle withdrawal can be either greatly accelerated or greatly delayed without affecting hemoglobin levels. Extending the proliferation of differentiating cells requires the synergistic action of CDK2 and CDK4. Importantly, CDK6 cannot substitute for CDK4 in this role, which demonstrates that the 2 cyclin D-dependent kinases are functionally different. The results show that differentiating hemoglobinized cells can be made to proliferate far beyond their normal capacity to divide. © 2000 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: L. Gilles, R. Guieze, D. Bluteau, V. Cordette-Lagarde, C. Lacout, R. Favier, F. Larbret, N. Debili, W. 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