期刊
PROTEIN JOURNAL
卷 30, 期 7, 页码 447-456出版社
SPRINGER
DOI: 10.1007/s10930-011-9350-0
关键词
CYP1A2; Inhibition; Isopimpinellin; Imperatorin; Trioxsalen
资金
- Minnesota Agricultural Experiment Station
- National Cancer Institute [T32CA132670]
Inhibition of cytochrome P-450 1A2 (CYP1A2)-mediated activation of procarcinogens may be an important chemopreventive mechanism. Consumption of apiaceous vegetables (rich in furanocoumarins) inhibits CYP1A2 in humans. Because many furanocoumarins are potent inhibitors of several CYPs, we characterized the effects of three furanocoumarins from apiaceous vegetables on human CYP1A2 (hCYP1A2). We assessed hCYP1A2 methoxyresorufin O-demethylase (MROD) activity using microsomes from Saccharomyces cerevisiae expressing hCYP1A2. Isopimpinellin exhibited mechanism-based inactivation (MBI) of hCYP1A2 (K (i) = 1.2 mu M, k (inact) = 0.34 min(-1), and partition ratio = 8). Imperatorin and trioxsalen were characterized as mixed inhibitors with K (i) values of 0.007 and 0.10 mu M, respectively. These results indicate that even if present at low levels in apiaceous vegetables, imperatorin, trioxsalen and isopimpinellin may contribute significantly to CYP1A2 inhibition and potentially decreased procarcinogen activation. Moreover, the in vivo effect of isopimpinellin on CYP1A2 may be longer lasting compared to reversible inhibitors.
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