Effects of 1,25-dihydroxy vitamin D3 on all-trans retinoic acid sensitive and resistant acute promyelocytic leukemia cells.

Abstract	Following challenge of the acute promyelocytic leukemia (APL) cell line, NB4, with 1, 25 dihydroxy vitamin D3 (1, 25 D3), no increase in the expression of the monocytic surface markers, CD11c, CD14 and HLA-DR is observed. By contrast, 1, 25 D3 increases the expression of CD11b, an early myeloid marker and enhances adherence to plastic following priming of the cells with phorbol 12-myristate 13-acetate (PMA). NB4.306 and NB4.007/6, two all-trans retinoic acid-resistant cell lines originated from NB4 promyelocytes and lacking expression of a complete form of PML-RAR, are totally resistant to 1, 25 D3-dependent induction of CD11b. In addition, NB4.306 cells do not show enhanced plastic adherence following treatment with the vitamin D metabolite and PMA. NB4 and NB4.306 express similar amounts of the transcripts coding for the vitamin D3 receptor and the retinoid accessory receptors, RXR alpha and RXR beta, both in basal conditions and upon treatment with 1, 25 D3.
Authors	M Giannì, M Terao, C Gambacorti-Passerini, A Rambaldi, E Garattini
Journal	Biochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 224 Issue 1 Pg. 50-6 (Jul 05 1996) ISSN: 0006-291X [Print] United States
PMID	8694833 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	Antigens, CD DNA Primers HLA-DR Antigens Integrin alphaXbeta2 Lipopolysaccharide Receptors Macrophage-1 Antigen Receptors, Retinoic Acid Retinoid X Receptors Transcription Factors Tretinoin Tetradecanoylphorbol Acetate
Topics	Antigens, CD (biosynthesis) Base Sequence Cell Line DNA Primers Drug Resistance, Neoplasm Gene Expression (drug effects) HLA-DR Antigens (biosynthesis) Humans Integrin alphaXbeta2 (biosynthesis) Leukemia, Promyelocytic, Acute Lipopolysaccharide Receptors (biosynthesis) Macrophage-1 Antigen (biosynthesis) Molecular Sequence Data Polymerase Chain Reaction Receptors, Retinoic Acid (biosynthesis) Retinoid X Receptors Tetradecanoylphorbol Acetate (pharmacology) Transcription Factors (biosynthesis) Tretinoin (pharmacology, toxicity) Tumor Cells, Cultured

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