Fadrozole and finasteride exposures modulate sex steroid- and thyroid hormone-related gene expression in Silurana (Xenopus) tropicalis early larval development

被引：59

作者：

Langlois, Valerie S. ^{[1
]}

Duarte-Guterman, Paula ^{[1
]}

Ing, Sally ^{[1
]}

Pauli, Bruce D. ^{[2
]}

Cooke, Gerard M. ^{[3
]}

Trudeau, Vance L. ^{[1
]}

机构：

[1] Univ Ottawa, Dept Biol, Ctr Adv Res Environmen Genom, Ottawa, ON K1N 6N5, Canada

[2] Environm Canada, Natl Wildlife Res Ctr, Ottawa, ON K1A 0H3, Canada

[3] Hlth Canada, Toxicol Res Div, Ottawa, ON K1A 0K9, Canada

来源：

GENERAL AND COMPARATIVE ENDOCRINOLOGY | 2010年 / 166卷 / 02期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Silurana (Xenopus) tropicalis; Amphibian; Embryogenesis; Aromatase; 5; alpha-Reductase; beta-Reductase; Cross-regulation; Thyroid hormone; AROMATASE CYTOCHROME-P450; 5-ALPHA-REDUCTASE TYPE-1; MAMMALIAN DEVELOPMENT; ANDROGEN METABOLISM; MESSENGER-RNA; BRAIN; LAEVIS; DIFFERENTIATION; ESTROGEN; INHIBITOR;

D O I：

10.1016/j.ygcen.2009.11.004

中图分类号：

R5 [内科学];

学科分类号：

1002 ; 100201 ;

摘要：

Steroidogenic enzymes and their steroid products play critical roles during gonadal differentiation in amphibians; however their roles during embryogenesis remain unclear. The objective of this study was to investigate the expression and activity of aromatase (cyp19; estrogen synthase) and 5 beta-reductase (srd5beta; 5 beta-dihydrotestosterone synthase) during amphibian embryogenesis. Expression and activity profiles of cyp19 and srd5beta were first established during Silurana (Xenopus) tropicalis embryogenesis from Nieuwkoop-Faber (NF) stage 2 (2-cell stage; 1 h post-fertilization) to NF stage 46 (beginning of feeding; 72 h post-fertilization). Exposures to fadrozole (an aromatase inhibitor; 0.5. 1.0 and 2.0 mu M) and finasteride (a putative 5-reductase inhibitor; 25, 50 and 100 mu M) were designed to assess the consequences of inhibiting these enzymes on gene expression in early amphibian larval development. Exposed embryos showed changes in both enzyme activities and sex steroid- and thyroid hormone-related gene expression. Fadrozole treatment inhibited cyp19 activity and increased androgen receptor and thyroid hormone receptor (alpha and beta) mRNAs. Finasteride treatment inhibited srd5beta (activity and mRNA), decreased cyp19 mRNA and activity levels and increased estrogen receptor alpha mRNA. Both treatments altered the expression of deiodinases (thyroid hormone metabolizing enzymes). We conclude that cyp19 and srd5beta are active in early embryogenesis and larval development in Silurana tropicalis and their inhibition affected transcription of genes associated with the thyroid and reproductive axes. (C) 2009 Elsevier Inc. All rights reserved.

引用

页码：417 / 427

页数：11

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