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Selective inhibition of methoxyflavonoids on human CYP1B1 activity.

Abstract：

:Cytochrome P450 (CYP) 1B1 catalyzes 17beta-estradiol (E(2)) to predominantly carcinogenic 4-hydroxy-E(2), whereas CYP1A1 and 1A2 convert E(2) to non-carcinogenic 2-hydroxy-E(2). Hence, selective inhibition of CYP1B1 is recognized to be beneficial for the prevention of E(2) related breast cancer. In this study, we first evaluated the structure-property relationship of 18 major flavonoids on inhibiting enzymatic activity of CYP1A1, 1A2 and 1B1 by using an ethoxyresorufin O-deethylation assay. Flavones and flavonols indicated relatively strong inhibitory effects on CYP1s compared with flavanone that does not have the double bond between C-positions 2 and 3 on the C-ring. Flavonoids used in this study selectively inhibited CYP1B1 activity. In particular, methoxy types of flavones and flavonols such as chrysoeriol and isorhamnetin showed strong and selective inhibition against CYP1B1. To understand why selective inhibition was observed, we carried out a molecular docking analysis of these methoxyflavonoids with the 2-3 double bond and CYP1s. The results suggested that chrysoeriol and isorhamnetin fit well into the active site of CYP1B1, but do not fit into the active site of CYP1A2 and 1A1 because of steric collisions between the methoxy substituent of these methoxyflavonoids and Ser-122 in CYP1A1 and Thr-124 in CYP1A2. In conclusion, our results demonstrate: (1) strong inhibitory effects of flavonoids on CYP1 activities require the 2-3 double bond on the C-ring; (2) methoxyflavonoids with the 2-3 double bond had strong and selective inhibition against CYP1B1, suggesting chemopreventive flavonoids for E(2) related breast cancer; and (3) binding specificity of these methoxyflavonoids is based on the interactions between the methoxy groups and specific CYP1s residues.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Takemura H,Itoh T,Yamamoto K,Sakakibara H,Shimoi K

doi

10.1016/j.bmc.2010.07.020

subject

Has Abstract

pub_date

2010-09-01 00:00:00

pages

6310-5

issue

17

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(10)00663-2

journal_volume

18

pub_type

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