Title : all-trans-Retinoic acid-induced expression and regulation of retinoic acid 4-hydroxylase (CYP26) in human promyelocytic leukemia.

Pub. Date : 2002 May

PMID : 11994980






10 Functional Relationships(s)
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1 all-trans-Retinoic acid-induced expression and regulation of retinoic acid 4-hydroxylase (CYP26) in human promyelocytic leukemia. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
2 all-trans-Retinoic acid-induced expression and regulation of retinoic acid 4-hydroxylase (CYP26) in human promyelocytic leukemia. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
3 We found that treatment of NB4 cells with a pharmacological concentration of ATRA (1 microM) induced rapid and dose-dependent expression of CYP26 mRNA. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
4 The CYP26 expression returned to pretreatment levels in both cells after ATRA was removed from the media. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
5 Retinoic acid receptor-alpha (RARalpha) specific antagonist (CD2503) totally abolished the ATRA-induced expression of CYP26 mRNA in HL-60 and NB4 cells. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
6 ATRA-induced expression of CYP26 was restored in HL-60R cells retrovirally transduced with RARalpha, but not in those cells transduced with the other retinoid receptors. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
7 In conclusion, ATRA induces expression of CYP26 in myeloid and promyelocytic leukemia cells and this expression is modulated by RARalpha. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
8 The induction of CYP26 expression by ATRA treatment might be related to a substrate-driven feedback mechanism to regulate intracellular concentrations of ATRA and its over expression in some clones may be partly responsible for reduced sensitivity or resistance to ATRA therapy. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
9 The induction of CYP26 expression by ATRA treatment might be related to a substrate-driven feedback mechanism to regulate intracellular concentrations of ATRA and its over expression in some clones may be partly responsible for reduced sensitivity or resistance to ATRA therapy. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens
10 The induction of CYP26 expression by ATRA treatment might be related to a substrate-driven feedback mechanism to regulate intracellular concentrations of ATRA and its over expression in some clones may be partly responsible for reduced sensitivity or resistance to ATRA therapy. Tretinoin cytochrome P450 family 26 subfamily A member 1 Homo sapiens