Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Expression of Vitellogenin Gene by Androgens in Rasinbow Trout, Oncorhynchus mykiss

웅성호르몬에 의한 무지개송어의 vitellogenin 유전자 발현

  • 권혁추 (선문대학교 응용생물과학부) ;
  • 윤종만 (군산대학교 해양생명의학과) ;
  • 이종영 (게이오대학 의학부 분자생물학교실)
  • Published : 2000.03.01
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Abstract

The effects of estrogen and androgens on Vg gene expression were examined in primary hepatocyte culture and livers of the immature male trout. Specific primers of Vg cDNA were designed with already reported Vg gene nucleotide sequences. PCR product was sequenced and verified with Vg cDNA of rainbow trout. Total RNA was extracted from the cultured hepatocytes and livers of steroid-treated rainbow trout and then it was analyzed by reverse transcriptase- polymerase chain reaction (RT-PCR) analysis. The Vg mRNA and Vg protein synthesis were increased in rainbow trout in vivo and in vitro with E$_2$ and methyltestosterone (MT) There were dose and time-related effects of E$_2$ and MT on vitellogesis. Androgens such as progesterone androsterone and testosterone also stimulated Vg mRNA expression in vitro. The results show that androgens as well as E$_2$ can induce expression of Vg mRNA in trout in vivo and in vitro.

자성 및 웅성스테로이드 호르몬들이 Vg 유전자발현에 영향을 미치는지를 미성숙 무지개송어의 배양간세포 막간을 이용하여 조사하였다. 이미 보고된 송어의 Vg gene의 염기배열을 참고로 Vg cDNA 단편(600 bp)을 증폭시킬 수 있는 primer들을 작성하였다. 이들 primer를 이용하여 증폭된 PCR 산물의 염기배열을 결정하여 송어의 Vg cDNA임을 확인하였고, RT-PCR법을 이용하여 배양간세포 그리고 E$_2$ 및 MT 처리된 송어의 간으로부터 Vg mRNA의 전사량 변화를 조사하였다. 호르몬 처리된 간세포 및 송어의 간에서 추출한 total RNA를 이용하여 RT-PCR법으로 분석한 결과 in vivo, in vitro 실험 모두에서 E$_2$ 또는 MT처리된 간세포 및 송어의 간으로부터 Vg mRNA와 Vg 단백질합성이 유도되었고, 이들의 증가 경향은 처리된 호르몬 농도 및 시간에 의존하고 있음이 밝혀졌다. 또한 progesterone, androsterone 그리고 testosterone 등의 웅성호르몬들도 Vg mRNA의 전사를 유도하고 있다는 것이 시사되었다. 이와 같은 결과로부터E$_2$ 뿐 아니라 웅성스테로이드들도 Vg mRNA의 발현을 유도하고 있음이 송어의 in vivo 또는 in vitro 실험에 의해서 확인되었다.

Keywords

References

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