TY - JOUR
T1 - Induction of cytochrome CYP4F3A in all-trans-retinoic acid-treated HL60 cells
AU - Mizukami, Yoichi
AU - Sumimoto, Hideki
AU - Takeshige, Koichiro
PY - 2004/1/30
Y1 - 2004/1/30
N2 - Cytochrome P-450 CYP4F3A catalyzes the inactivation of leukotriene B 4 by ω-hydroxylation, an activity of which is specifically expressed in human neutrophils. Here, we examined expression of the LTB 4 ω-hydroxylating activity during the differentiation of HL60 cells, an acute promyelocytic leukemia cell line, in the presence of various inducers. Among the inducers used, all-trans-retinoic acid (ATRA) most strongly induces the LTB4 ω-hydroxylating activity in a dose-dependent manner. The time course of the induction of the ω-hydroxylating activity correlates well with that of the superoxide-generating activity, indicative of cell differentiation. ATRA-treated cell microsomes convert LTB4 to its 20-hydroxyl derivative under aerobic conditions in the present of NADPH. The reaction is inhibited by carbon monoxide, an inhibitor of cytochrome P-450, and by antibodies raised against NADPH-P-450 reductase. CYP4F3A appears to be responsible for the LTB4 ω-hydroxylase activity, based on the following observations: expression of the mRNA for CYP4F3A is observed together with the induction of LTB4 ω-hydroxylating activity in ATRA-treated HL60 cells; and the apparent Km values for the ω-hydroxylation of LTB4 and lipoxin B4 by ATRA-treated cell microsomes are essentially the same as those of CYP4F3A in human neutrophil microsomes.
AB - Cytochrome P-450 CYP4F3A catalyzes the inactivation of leukotriene B 4 by ω-hydroxylation, an activity of which is specifically expressed in human neutrophils. Here, we examined expression of the LTB 4 ω-hydroxylating activity during the differentiation of HL60 cells, an acute promyelocytic leukemia cell line, in the presence of various inducers. Among the inducers used, all-trans-retinoic acid (ATRA) most strongly induces the LTB4 ω-hydroxylating activity in a dose-dependent manner. The time course of the induction of the ω-hydroxylating activity correlates well with that of the superoxide-generating activity, indicative of cell differentiation. ATRA-treated cell microsomes convert LTB4 to its 20-hydroxyl derivative under aerobic conditions in the present of NADPH. The reaction is inhibited by carbon monoxide, an inhibitor of cytochrome P-450, and by antibodies raised against NADPH-P-450 reductase. CYP4F3A appears to be responsible for the LTB4 ω-hydroxylase activity, based on the following observations: expression of the mRNA for CYP4F3A is observed together with the induction of LTB4 ω-hydroxylating activity in ATRA-treated HL60 cells; and the apparent Km values for the ω-hydroxylation of LTB4 and lipoxin B4 by ATRA-treated cell microsomes are essentially the same as those of CYP4F3A in human neutrophil microsomes.
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U2 - 10.1016/j.bbrc.2003.12.062
DO - 10.1016/j.bbrc.2003.12.062
M3 - Article
C2 - 14715252
AN - SCOPUS:0346095166
SN - 0006-291X
VL - 314
SP - 104
EP - 109
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
IS - 1
ER -