TY - JOUR
T1 - Suppression of sexual behavior in male Japanese medaka (Oryzias latipes) exposed to 17β-estradiol
AU - Oshima, Yuji
AU - Kang, Ik Joon
AU - Kobayashi, Makito
AU - Nakayama, Kei
AU - Imada, Nobuyoshi
AU - Honjo, Tsuneo
N1 - Funding Information:
The authors acknowledge the financial support provided by Grant-in-Aid (10660183) from The Ministry of Education and Technology, Japan.
PY - 2003/1
Y1 - 2003/1
N2 - Mating pairs of Japanese medaka (Oryzias latipes) received 17β-estradiol (E2; dose, 3 and 30 μg/g body weight daily) in their diet and E2-free diet (control) for two weeks. The effect on reproductive success was assessed in the mating pairs, and sexual and nonsexual behaviors in the male were quantified. The fecundities of the E2-treated groups were reduced significantly (p < 0.05) compared with those of control, and the sexual behaviors (following, dancing, floating, and crossing) of male fish in response to prostaglandin F2α (PG)-injected E2-unexposed females were suppressed dramatically. While the fertility of spawned eggs and the frequencies of the nonsexual behaviors of resting and swimming in a straight line performed by male were unchanged in E2-exposed groups. Therefore, sexual behavior in male may be linked with reproductive success in mating pair of madaka exposed to E2. This assay for sexual behavior using PG may provide a useful tool for assessing the effect of endocrine-disrupting chemicals.
AB - Mating pairs of Japanese medaka (Oryzias latipes) received 17β-estradiol (E2; dose, 3 and 30 μg/g body weight daily) in their diet and E2-free diet (control) for two weeks. The effect on reproductive success was assessed in the mating pairs, and sexual and nonsexual behaviors in the male were quantified. The fecundities of the E2-treated groups were reduced significantly (p < 0.05) compared with those of control, and the sexual behaviors (following, dancing, floating, and crossing) of male fish in response to prostaglandin F2α (PG)-injected E2-unexposed females were suppressed dramatically. While the fertility of spawned eggs and the frequencies of the nonsexual behaviors of resting and swimming in a straight line performed by male were unchanged in E2-exposed groups. Therefore, sexual behavior in male may be linked with reproductive success in mating pair of madaka exposed to E2. This assay for sexual behavior using PG may provide a useful tool for assessing the effect of endocrine-disrupting chemicals.
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U2 - 10.1016/S0045-6535(02)00494-0
DO - 10.1016/S0045-6535(02)00494-0
M3 - Article
C2 - 12656264
AN - SCOPUS:0037235994
VL - 50
SP - 429
EP - 436
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
IS - 3
ER -