Expression of aromatase mRNA and effects of aromatase inhibitor during ovarian development in the medaka, Oryzias latipes.
In teleost fish, several studies have implicated estrogens in the process of ovarian development, but the exact role of endogenous estrogen is still unclear. We examined the expression of aromatase mRNA with in situ hybridization, and the effects of Fadrozole, a nonsteroidal aromatase inhibitor (AI), during ovarian development in medaka Oryzias latipes. Medaka aromatase was first detected on the ventral side of ovaries from four to 10 days after hatching (dah), after occurrence of oogenesis. AI treatment after hatching suppressed the ovarian cavity formation from 30 dah but did not affect early oogenesis and folliculogenesis during ovarian development. These results suggest that endogenous estrogen is specifically required for formation of the ovarian cavity, but is not essential for early oogenesis and folliculogenesis in medaka.
Department of Environmental System Science, Graduate School of Science and Technology, Shinshu University, Asahi, Matsumoto 390-8621, Japan.
Aya
A
Suzuki
Minoru
M
Tanaka
Naoki
N
Shibata
Yoshitaka
Y
Nagahama
D000284:Administration, Oral; D000818:Animals; D001141:Aromatase / Q000235:genetics* / Q000378:metabolism; D004965:Estrogen Antagonists / Q000008:administration & dosage / Q000494:pharmacology*; D004967:Estrogens / Q000235:genetics* / Q000378:metabolism; D017316:Fadrozole / Q000008:administration & dosage / Q000494:pharmacology*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects*; D017403:In Situ Hybridization; D009990:Oryzias / Q000235:genetics*; D010053:Ovary / Q000254:growth & development / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D012727:Sex Characteristics; D014818:Vitellogenesis
D004965:Estrogen Antagonists; D004967:Estrogens; D012333:RNA, Messenger; D001141:Aromatase; D017316:Fadrozole