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수컷 생식에서 옥시토신의 역할

Role of Oxytocin in Male Reproduction

이성호
한국발생생물학회 (The Korea Society Of Developmental Biology)|2009.06|발생과 생식 (DEVELOPMENT & REPRODUCTION)|제13권 제2호|pp. 79-87

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참고문헌

주제분류생물학

초록

출산과 수유 과정에서의 잘 알려진 기능 때문에, 옥시토신(oxytocin, OT)은 ‘여성 뇌하수체후엽 호르몬(female neurohypophyseal hormone)’으로 알려져 왔다. 그러나 최근의 연구들에 따르면 OT가 중추신경계와 말초조직 수준에서 수컷 생식을 조절하는 국부적인 기능을 가짐이 알려졌다. 일부 실험용 설치류에서, OT는 사회적인 자극들에 반응하여 뇌의 특정 지역으로 분비되는데, 이 뇌 OT와 그 수용체(OTR)를 매개로한 작용들은 수컷의 다양한 행동, 특히 교미관련 행동의 조절에 깊이 관여한다. 최근에 개발된 OT와 OTR knockout 생쥐 모델들은 사회적-성적 행동의 분자조절 기작들에 대한 중요한 실마리들을 제공한다. OT는 또한 설치류의 정소, 부정소, 전립선에서도 합성되며, 이들 조직에서도 OTR이 발현됨이 보고되어왔다. OT는 말초적으로 testosterone(T)을 dihydrotestosterone(DHT)로 전환시키는 5alpha-reductase의 활성조절을 통해 정소의 스테로이드호르몬 합성과 분비에 관여한다. 안드로겐 전환을 유도하는 OT 작용들이 부정소와 전립선에서도 발견되는데, 이는 OT가 이들 안드로겐 의존적인 생식도관의 기능들, 예를 들어 평활근 수축 유도와 같은 기능을 조절함을 시사한다. 이러한 맥락에서, 수컷의 뇌와 생식기관 중추신경계와 생식기관에서의 OT의 기능들에 대한 향후 연구들은 복잡한 사회적-성적 행동에 대한 이해증진과 심리적 혹은 남성과학적 이상에 대한 치료법 개발에 대한 기반을 제공할 수 있을 것이다.

Abstract

Due to its well-known function in parturition and milk ejection, oxytocin(OT) has been considered as a 'female neurohypophyseal hormone'. Recent studies, however, clearly indicate that OT has some local roles in male reproduction via both central and peripheral routes. In experimental rodents, OT is released within distinct brain regions in response to social stimuli, and the brain OT receptor(OTR) mediated actions were strongly involved in the regulation of a variety of male behaviors such as mating-associated behaviors. In particular, OT and/or OTR knockout mice provide important clues about the molecular regulatory mechanism of the socio-sexual behaviors. Several lines of evidence also show that OT is synthesized within rodents testis, epididymis and prostate, and the presence of OTRs in these organs. In rodent testes, OT might have a role in the modulation of steroidogenesis via stimulation of the conversion of testosterone(T) to dihydrotestosterone(DHT) by 5alpha-reductase. Similar effects of OT on this androgen conversion were observed in epididymis and prostate suggesting the OT's modulatory role, such as contractility induction, in these androgen-dependent organs. In this context, further investigations on the OT's role in male CNS and reproductive organs are likely to provide better understanding on the complex socio-sexual behaviors and a platform for development of therapeutics to treat some psychological and/or andrological problems.

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