Sex- and tissue-specific effects of waterborne estrogen on estrogen receptor subtypes and E2-mediated gene expression in the reproductive axis of goldfish.
This research examined the gene expression profile of three goldfish estrogen receptor (ER) subtypes in multiple tissues in relation to mRNA levels of aromatase B and vitellogenin (VTG) following waterborne estrogen exposures. The protocol consisted of: i) adult male goldfish in late gonadal recrudescence exposed to 1 nM 17beta-estradiol (E2); ii) adult male and female goldfish in early sexual regression exposed to 1 nM E2 for 3, 6, 12 and 24h; and, iii) sexually mature, adult male goldfish exposed to 0.3 nM 17alpha-ethynylestradiol (EE2) for 24h. Liver produced the most consistent response with up-regulation of ERalpha in sexually regressed, mature and recrudescing males and in sexually regressed females. The dose and length of exposure, reproductive state and sex affected the auto-regulation of ERbeta1 by E2. ERbeta2 was not affected in any experiments suggesting it may not be auto-regulated by E2. Aromatase B and VTG gene expression were affected by E2, but also by other experimental conditions. EE2 induced liver ERalpha and VTG mRNA levels indicating that high environmental EE2 levels induce E2-mediated gene expression in a model teleost. These studies reveal a more complicated action of estrogenic compounds that has important implications on estrogenic endocrine disruptors in teleosts.
Marlatt
Vicki L
VL
Centre for Advanced Research in Environmental Genomics, Department of Biology, University of Ottawa, Ottawa, ON, Canada. marlatt@isamundo.org
Lakoff
Josh
J
Crump
Kate
K
Martyniuk
Chris J
CJ
Watt
Jennifer
J
Jewell
Linda
L
Atkinson
Susanna
S
Blais
Jules M
JM
Sherry
Jim
J
Moon
Thomas W
TW
Trudeau
Vance L
VL
D000818:Animals; D001141:Aromatase / Q000235:genetics; D004958:Estradiol / Q000378:metabolism; D045166:Estradiol Congeners / Q000633:toxicity*; D047628:Estrogen Receptor alpha / Q000235:genetics*; D047629:Estrogen Receptor beta / Q000235:genetics*; D004997:Ethinyl Estradiol / Q000633:toxicity; D005260:Female; D015870:Gene Expression / Q000187:drug effects; D020869:Gene Expression Profiling; D006054:Goldfish / Q000235:genetics* / Q000378:metabolism* / Q000502:physiology; D008297:Male; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012098:Reproduction / Q000187:drug effects / Q000235:genetics; D012727:Sex Characteristics; D014018:Tissue Distribution; D014819:Vitellogenins / Q000235:genetics; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D045166:Estradiol Congeners; D047628:Estrogen Receptor alpha; D047629:Estrogen Receptor beta; D012333:RNA, Messenger; D014819:Vitellogenins; D014874:Water Pollutants, Chemical; D004997:Ethinyl Estradiol; D004958:Estradiol; D001141:Aromatase