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17β-Estradiol이 수컷 송사리의 성적 행위 및 생식능력에 미치는 영향
류지성(Jusugn Ryu),이철우(Chulwoo Lee),박응로(Eung-Roh Park),남성숙(Seong-Sook Nam),남규찬(Kyu-Chan Nam),류홍일(Hong-Il Rhu),전성환(Seong-Hwan Jeon),나진균(Jin Gyun Na),최덕일(Doug Il Choi),박광식(Kwangsik Park) 한국독성학회 2001 Toxicological Research Vol.17 No.2
Sexual behavior and reproductivity of male fish were studied as an in vivo screening method of endocrine disruptors. Male medaka (Oryzias latipes) were exposed to 17β-estradiol at nominal concentrations of 2 and 20 ㎍/l 14 days. After exposure of the chemical, sexual behavior between male medaka and normal female which were injected with prostaglandin F2α just before the test, was ana lysed by using video camera for one hour. Normal control male showed courtship dancing such as following, guarding, dancing and crossing while 17β-estradiol treated male did not show any type of courtship dancing. Furthermore, fecundity and fertility were significantly decreased in the treated group. It was suggested that analysis of sexual behavior could be a useful endpoint for the screening of the endocrine disruptors.
남성숙,이철우,류지성,박응로,남규찬,류홍일,전성환,나진균,최덕일,박광식 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.2
To evaluate the arsenic effect of fish endocrine disruption, crucian carp (Carassius auratus) were treated with 0.5 mg/L and 3.0mg/L of As₂O₃ for 14 days and gonadal development was examined by histological analysis. In ovaries from female crucian carps exposed to 3.0mg/L, immature follicles and atretic follicles were appeared while various normal developmental stages of oocytes were shown in control group. Body weight and Gonadosomatic Index (GSI) of treated carp were also decreased compared to control group. However, no other significant histological changes in liver or kidney were shown in this exposure scheme, This means that reproductive organs are more sensitive than other organs and arsenic may exert endocrine disrupting effect through inhibiting the development of reproductive organ in fish.
카드뮴 측적량과 붕어(Carassius auratus) 아가미 조직 변화의 상관성에 관한 연구
배희경,김은경,남성숙,문창규,전성환,나진균,박광식 한국환경독성학회 2002 환경독성보건학회지 Vol.17 No.1
Histopathological changes and cadmium accumulations in the gills were investigated in crucian carp (Carassius auratus) exposed to 0, 0.01, 0.1, 0.5 mg/l cadmium (Cd)concentrations for 25 days. After 25 days of exposure, cadmium accumulations increased in each of the different exposure concentrations. Histopathological changes in the gills of curcian carp exposed to cadmium included the acidification of mucous cell, the terminal clubbing of lamellae, the hyperplasia of epitherial cell and the curved of secondary lamellae. The similar histopathological changes were observed once the accumulations of cadmium reached the similar levels found in the present study with the different exposure schemes. Also the acidification of mucous cell in gills appeared when cadmium accumulations reached 5 ㎍/g and more. These results suggested that histopathological changes in the gills, an appearance of mucous cell acidification, be used to estimate the relation between toxic effect and cadmium accumulations in the gills.
Di-2-ethylhexyl phthalate 처리 남아프리카산발톱개구리에서의 vitellogenin 발현
박응로,이철우,류지성,남성숙,전성환,나진균,최덕일,박광식 한국환경독성학회 2001 환경독성보건학회지 Vol.16 No.1
The estrogenic potency of di-2-ethylhexyl phthalate (DEHP) using reverse transcriptase-PCR response of liver vitellogenin mRNA in male African clawed frog (Xenopus laevis) was studied. Male frogs were injected with DEHP at dose of 300 ㎍/kg and 300 mg/kg body weight through the dorsal lymph sac. After 4 days, using suitable pair of RT-PCR primers, vitellogenin mRNA induction in the liver was measured and DEHP showed vitellogenin mRNA induction in only the group treated with 300 mg/kg. Any significant histological abnormalities by the exposure of DEHP was not shown in both testis and liver.