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Related Collections Hematopoiesis and Stem Cells Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, Vol. 93 No. 7 (April 1), 1999: pp. 2225-2233 1,25-Dihydroxyvitamin D3 Induces Differentiation of a Retinoic Acid-Resistant Acute Promyelocytic Leukemia Cell Line (UF-1) Associated With Expression of p21WAF1/CIP1 and p27KIP1 Akihiro Muto, Masahiro Kizaki, Kenji Yamato, Yohko Kawai, Maiko Kamata-Matsushita, Hironori Ueno, Masahiro Ohguchi, Tatsuji Nishihara, H. Phillip Koeffler, and Yasuo Ikeda From the Division of Hematology and Clinical Laboratories, Keio University School of Medicine, Tokyo; the Department of Molecular Cellular Oncology/Microbiology, Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo; the Division of Oral Science, The National Institute of Infectious Diseases, Tokyo, Japan; and the Division of Hematology/Oncology, Cedars-Sinai Medical Center, University of California-Los Angeles School of Medicine, Los Angeles, CA. Retinoic acid (RA) resistance is a serious problem for patients with acute promyelocytic leukemia (APL) who are receiving all-trans RA. However, the mechanisms and strategies to overcome RA resistance by APL cells are still unclear. The biologic effects of RA are mediated by two distinct families of transcriptional factors: RA receptors (RARs) and retinoid X receptors (RXRs). RXRs heterodimerize with 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] receptor (VDR), enabling their efficient transcriptional activation. The cyclin-dependent kinase (cdk) inhibitor p21WAF1/CIP1 has a vitamin D3-responsive element (VDRE) in its promoter, and 1,25(OH)2D3 enhances the expression of p21WAF1/CIP1 and induces differentiation of selected myeloid leukemic cell lines. We have recently established a novel APL cell line (UF-1) with features of RA resistance. 1,25(OH)2D3 can induce growth inhibition and G1 arrest of UF-1 cells, resulting in differentiation of these cells toward granulocytes. This 1,25(OH)2D3-induced G1 arrest is enhanced by all-trans RA. Also, 1,25(OH)2D3 (1010 to 107 mol/L) in combination with RA markedly inhibits cellular proliferation in a dose- and time-dependent manner. Associated with these findings, the levels of p21WAF1/CIP1 and p27KIP1 mRNA and protein increased in these cells. Northern blot analysis showed that p21WAF1/CIP1 and p27KIP1 mRNA and protein increased in these cells. Northern blot analysis showed that p21WAF1/CIP1 and p27KIP1 transcripts were induced after 6 hours' exposure to 1,25(OH)2D3 and then decreased to basal levels over 48 hours. Western blot experiments showed that p21WAF1/CIP1 protein levels increased and became detectable after 12 hours of 1,25(OH)2D3 treatment and induction of p27KIP1 protein was much more gradual and sustained in UF-1 cells. Interestingly, the combination of 1,25(OH)2D3 and RA markedly enhanced the levels of p27KIP1 transcript and protein as compared with levels induced by 1,25(OH)2D3 alone. In addition, exogenous p27KIP1 expression can enhance the level of CD11b antigen in myeloid leukemic cells. In contrast, RA alone can induce G1 arrest of UF-1 cells; however, it did not result in an increase of p21WAF1/CIP1 and p27KIP1 transcript and protein expression in RA-resistant cells. 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