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범가자미, Verasper variegatus의 생식소 발달단계에 따른 혈중 난황단백전구체 (vitellogenin)와 성 스테로이드 호르몬 변화
한창희,會田勝美,김윤,백혜자,小林牧人 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1
Annual plasma levels of vitellogenin and sex steroids were investigated in relation to the gonadal development for understanding the endocrine control of reproduction in spotted flounder, Verasper variegatus. The plasma vitellogenin level was highest, 6.36㎎/㎖, in November when vitellogenesis was most active. The level, thereafter, decreased to 3.81㎎/㎖ in December with the initiation of spawning. On the other hand, estradiol-17 β was highest, 2.7ng/㎖, in December, and rapidly decreased in January when spawning occurred. The decreased level of estradiol-17 β, around 0.2ng/㎖, remained unchanged until May. The profiles of plasma testosterone were similar to those of estradiol-17 β in the fish. The Plasma 17 α-hydroxyprogesterone level was relatively low throughout the spawning period, but increased slightly with the initiation of ovarian development. In males, the plasma testosterone and 11- ketotestosterone were highest in December when spermiation actively proceeded, but rapidly decreased during the spawning period (January).
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Testosterone 처리한 미성숙 무지개송어 뇌하수체의 세포배양계에서 생식소자극호르몬 분비에 대한 Activin의 효과
김대중,한창희,會田勝美 동의대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.10 No.1
The present studies were conducted to evaluate the effects of activin-A on gonadotropins(GTHs) release in testosterone-treated immature rainbow trout, Oncorhynchus mykiss. The administration of testosterone elevated pituitary level of GTH Ⅱ but not of GTH Ⅰ. In this study using primary cultures of dispersed pituitary cells in static incubation, dose-dependent increases in GTHⅡ release was observed in the activin-treated group at day 3 of incubation(long-term incubation), but not at day 1 of incubation (short-term incubation). Dopamine, a potent inhibitor of gonadotropin-releasing hormone (GnRH)-stimulated GTHⅡ release in trout, was only partially effective in decreasing activin-induced GTHⅡ release. Futhermore, salmon GnRH(sGnRH)-stimulated GTHⅡrelease was not potentiated by the pretreatment with activin. However, the control mechanisms of GTHⅠ release by activin and other hormones were not observed in the all tested experiments. The results of these studies support the contention that in contrast with the usual stimulatory effects of activin on GTH release in mammals, activin exerts long-term stimulatory actions on GTHⅡ release in rainbow trout. The control mechanism of GTHⅠrelease, however, is a question that remains to be elucidated.
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백재민(Jae Min Baek),한창희(Chang Hee Han),김대중(Dae Jung Kim),박철원(Chul Won Park),회전승미(Katsumi Aida) 한국수산과학회 2000 한국수산과학회지 Vol.33 No.5
본 실험은 조피볼락 (Sebastes schlegeli)의 생식년주기와 생식주기에 따른 sex steroid hormone들의 계절적인 변화를 밝히기 위하여 GSI와 HSI의 연간 변동과 생식소 조직학적인 연간 변화와 sex steroid hormone (estradiol-17β, 17α 20β-dihydroxy-4-pregnen-3-one, testosterone, 그리고 11-ketotestosterone)의 혈중 수준의 연간 변화를 조사하였다. 암컷의 생식주기는 다음과 같이 5단계로 구분할 수 있었다: 1) 회복기 (6월∼9월): 혈중 estradiol-17β의 수준이 점차 증가 하였다: 2) 난황형성기 (9월-2월): 난모세포의 난황 형성이 관찰되며, GSI 값과 혈중 estradiol-17β수준이 증가하였다; 3) 임신기 (2월∼4월): 난소내에 발생중인 자어가 관찰되며, 2월에서 3월에 이르러 혈중 17α, 20β-dihydroxy-4-pregnen-3-one와 testosterone의 수준이 증가하였다; 4) 출산기 (4∼5월): GSI 값이 급격히 감소하면서 난소내에는 자어들의 출산된 흔적이 보였다; 5) 휴지기 (5월∼7월): GSI값과 혈중 steroid hormone의 수준이 낮은 값을 유지하였다. 수컷의 생식년주기는 6단계로 나눌 수 있었다; 1) 정자형성 초기(4월∼6월): GSI의 값과 혈중 steroid hormone의 수준이 점진적으로 증가하였으며, 정원세포의 포낭이 수가 증가하고 일부의 정모세포의 포낭들도 관찰되었다; 2) 정자형성 중기 (6월∼9월): GSI의 값과 혈중 steroid hormone의 수준이 증가하고 많은 포낭내의 생식세포들이 활발하게 정자형성을 하고 있었다; 3) 정자형성기 후기 (9월∼11월): GSI와 steroid hormone의 수준이 높은 값을 유지하고 있었으며, 정자들이 정세관 내강으로 방출되었다; 4) 정자 방출기 (11월∼12월): 정세관의 내강이 확장되고 이 내강내에는 성숙된 정자들로 가득차 있었다; 5) 퇴화기 (12월∼2월); GSI의 값이 점차로 감소하면서 정모세포의 포낭수도 점차로 감소하였다; 6) 휴지기 (2월∼4월): 정소조직의 변화는 보이지 않았으며, GSI와 steroid hormone의 수준이 낮은 값을 유지하였다. 11월에 정소들의 정세관 내강에 성숙된 정자들로 가득차 있었고 난소내강에 정자괴들이 관찰되는 것으로 보아 이종의 교미시기는 11월과 12월사이라고 할 수 있다. To clarify the annual reproductive cycle in a rockfish, Sebastes scblegeli, monthly changes in gonadosomatic index (GSI), hepatosomatic index (HSI) and histological feature of gonads and plasma levels of sex steroid hormones (estradiol-17β, 17α, 20β-dihydroxy-4-pregnen-3-one, testosterone and 11-ketotestosterone) were investigated. The annual reproductive cycle in females could be divided into 5 periods as follows: 1) recovery period (June to September): serum level of estradiol-17β increased gradually; 2) vitellogenesis period (Septemer to February): vitellogenic oocytes were observed, GSI sustained high value, and serum level of estradiol-17β increased; 3) gestation period (February-April): developing larva showed in the ovary, and serum levels of 17α, 20β-dihydroxy-4-pregnen-3-one and testosterone increased; 4) partrition period (April to May): larva were delivered, and value of GSI and serum levels of hormones decreased rapidly; 5) resting period (May to June): value of GSI and serum levels of estradiol-17β and testosterone remained low. The annual reproductive cycle in males could be divided into 6 periods; 1) early maturation period (April to June): value of GSI and serum levels of hormones incresed gradually, cyst of spermatogonia incresed in number, and a small number of cyst of spermatocyte was observed; 2) mid-maturation perid (June to September); value of GSI and serum levels of hormones increased, and germ cells in many cysts were undergoing active spermatogenesis; 3) late maturation period (September to November): value of GSI and serum levels of hormones remained high and spermatozoa were released into the lumina of the seminal lobules; 3) spermatozoa dischaging period (Nobember to December): the lamina of the seminal lobules were enlarged and filled with mature spermatozoa; 4) degeneration period (December to February); value of GSI decresed and cyst of spermatocyte were decresed in number; 5) resting period (December to April): no histological changes of testes were observed, and value of GSI and serum levels of hormones remained low. In November, the lumina of the seminal lobules were filled with mature spermatozoa and sperm masses were present in the ovarian cavity. Thus, copulation in this species occurred in November and December.
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