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Related Collections Neoplasia Cell Cycle Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 15 March 2002, Vol. 99, No. 6, pp. 2199-2206 NEOPLASIA Retinoic acid-induced cell cycle arrest of human myeloid cell lines is associated with sequential down-regulation of c-Myc and cyclin E and posttranscriptional up-regulation of p27Kip1 Anna Dimberg, Fuad Bahram, Inger Karlberg, Lars-Gunnar Larsson, Kenneth Nilsson, and Fredrik Öberg From the Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden, and the Department of Plant Biology, Uppsala Genetic Center, Swedish University of Agricultural Sciences, Uppsala, Sweden. All-trans retinoic acid (ATRA) is a potential therapeutic agent for the treatment of hematopoietic malignancies, because of its function as an inducer of terminal differentiation of leukemic blasts. Although the efficacy of ATRA as an anticancer drug has been demonstrated by the successful treatment of acute promyelocytic leukemia (APL), the molecular mechanisms of ATRA-induced cell cycle arrest of myeloid cells have not been fully investigated. In this study, we show that the onset of ATRA-induced G0/G1 arrest of human monoblastic U-937 cells is linked to a sharp down-regulation of c-Myc and cyclin E levels and an increase in p21WAF1/CIP1 expression. This is followed by an increase in p27Kip1 protein expression due to enhanced protein stability. The importance of an early decrease in Myc expression for these events was demonstrated by the failure of a U-937 subline with constitutive exogenous expression of v-Myc to cell cycle arrest and regulate cyclin E and p27Kip1 in response to ATRA. Preceding the initiation of G1 arrest, a transient rise in retinoblastoma protein (pRb), p107, and cyclin A levels was detected. Later, a rapid fall in the levels of cyclins A and B and a coordinate dephosphorylation of pRb at Ser780, Ser795, and Ser807/811 coincided with the accumulation of cells in G1. These results thus identify a decrease in c-Myc and cyclin E levels and a posttranscriptional up-regulation of p27Kip1 as important early changes, and position them in the complex chain of events regulating ATRA-induced cell cycle arrest of myeloid cells. © 2002 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: H. Hattori, X. Zhang, Y. Jia, K. K. Subramanian, H. Jo, F. Loison, P. E. Newburger, and H. R. Luo RNAi screen identifies UBE2D3 as a mediator of all-trans retinoic acid-induced cell growth arrest in human acute promyelocytic NB4 cells Blood, July 15, 2007; 110(2): 640 - 650. [Abstract] [Full Text] [PDF] J. Zhang, F. Li, X. Liu, L. Shen, J. Liu, J. Su, W. Zhang, Y. Deng, L. Wang, N. 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