TY - JOUR AB - Vitamin K2 (VK2) effectively induces apoptosis in leukemia cell lines, including HL-60 and U937. However, combined treatment of cells with VK2 plus 1α, 25-dihydroxy vitamin D3 (VD3) resulted in suppression of VK2-inducing apoptosis and pronounced induction of monocytic differentiation as compared with that by VD3 alone. After achieving monocytic differentiation by pre-exposure to VK2 and VD3, the cells became resistant to various apoptotic stimuli including VK2- and H2O2-treatment and serum deprivation. Accumulation of cytoplasm p21CIP1 along with disappearance of nuclear p21CIP1 was detected in cells in response to 96-h treatment with VK2 plus VD3. A stable transfectant, U937-ΔNLS-p21CIP1, which lacked the nuclear localization signal of p21CIP1 and showed overexpression of cytoplasm p21CIP1 without monocytic differentiation, was resistant to apoptosis. These data suggest that a change of intracellular distribution of p21CIP1 from nucleus to cytoplasm along with differentiation appears to be anti-apoptotic. Clinical benefits of using VK2 for treatment of patients with leukemia and myelodysplastic syndrome (MDS) have been reported. Our data suggest that VK2 plus VD3 may be an effective combination for differentiation-based therapy for leukemia and also MDS whose cytopenias are mediated though apoptosis. AD - First Department of Internal Medicine, Tokyo Medical University, Tokyo, Japan null AU - Iguchi,Tomotaka AU - Miyazawa,Keisuke AU - Asada,Minoru AU - Gotoh,Akihiko AU - Mizutani,Shuki AU - Ohyashiki,Kazuma DA - 2005/10/01 DO - 10.3892/ijo.27.4.893 EP - 900 IS - 4 JO - Int J Oncol PY - 2005 SN - 1019-6439 1791-2423 SP - 893 ST - Combined treatment of leukemia cells with vitamin K2 and 1α,25-dihydroxy vitamin D3 enhances monocytic differentiation along with becoming resistant to apoptosis by induction of cytoplasmic p21CIP1 T2 - International Journal of Oncology TI - Combined treatment of leukemia cells with vitamin K2 and 1α,25-dihydroxy vitamin D3 enhances monocytic differentiation along with becoming resistant to apoptosis by induction of cytoplasmic p21CIP1 UR - https://doi.org/10.3892/ijo.27.4.893 VL - 27 ER -