Evaluation of ovotoxicity induced by 7, 12-dimethylbenz[a]anthracene and its 3,4-diol metabolite utilizing a rat in vitro ovarian culture system.
Evaluation of ovotoxicity induced by 7, 12-dimethylbenz[a]anthracene and its 3,4-diol metabolite utilizing a rat in vitro ovarian culture system.
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DOI:
10.1016/j.taap.2008.10.009
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发表时间:
2009-02-01
影响因子:
3.8
通讯作者:
Hoyer PB
中科院分区:
文献类型:
--
作者:
Igawa Y;Keating AF;Rajapaksa KS;Sipes IG;Hoyer PB
The polycyclic aromatic hydrocarbon 7, 12-dimethylbenz[a]anthracene, (DMBA), targets and destroys all follicle types in rat and mouse ovaries. DMBA requires bioactivation to DMBA-3,4-diol-1,2-epoxide for ovotoxicity via formation of the intermediate, DMBA-3,4-diol (catalyzed by microsomal epoxide hydrolase; mEH). mEH was shown to be involved in DMBA bioactivation for ovotoxicity induction in B6C3F1 mouse ovaries. The current study compared DMBA and DMBA-3,4-diol mediated ovotoxicity, and investigated mEH involvement in DMBA-3,4-diol bioactivation in Fischer 344 (F344) rat ovary. F344 postnatal day (PND) 4 rat ovaries were cultured in vehicle control or media containing 1) DMBA or DMBA-3,4-diol (12.5 nM - 1 μM; 15 days); 2) DMBA (1μM; 6 h -15 days); and 3) DMBA (1μM) or DMBA-3,4-diol (75 nM) ± the mEH activity inhibitor cyclohexene oxide (CHO; 2 mM; 4 days). Ovaries were histologically evaluated and mEH mRNA and protein were measured by reverse transcriptase PCR or Western blotting, respectively. Ovotoxicity following 15 days of culture occurred (P < 0.05) at lower concentrations of DMBA-3,4-diol (12.5 nM - primordial; 75 nM - primary) than DMBA (75 nM - primordial; 375 nM - primary). The temporal pattern of mEH expression following DMBA exposure showed mRNA up-regulation (P < 0.05) on day 2, with increased protein (P < 0.05) on day 4, the earliest time of observed follicle loss (P < 0.05). mEH inhibition prevented DMBA-induced, but not DMBA-3,4-diol-induced ovotoxicity. These results demonstrate a conserved response in mice and rats for ovarian mEH involvement in DMBA bioactivation to its ovotoxic, 3,4-diol-1,2-epoxide form.
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影响因子:
3.8
作者:
Devine, PJ;Sipes, IG;Hoyer, PB
通讯作者:
Hoyer, PB
影响因子:
3.8
作者:
Gao, J;Lauer, FT;Burchiel, SW
通讯作者:
Burchiel, SW
影响因子:
3.8
作者:
Keating, Aileen F.;Rajapaksa, Kathila S.;Hoyer, Patricia B.
通讯作者:
Hoyer, Patricia B.
影响因子:
3.8
作者:
Cannady, EA;Dyer, CA;Hoyer, PB
通讯作者:
Hoyer, PB
影响因子:
9.7
作者:
VIGNY, P;BRUNISSEN, A;SIMS, P
通讯作者:
SIMS, P