Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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A Morphological Study on the Granulosa Cell Apoptosis and Macrophages during Follicular Atresia in Pig Ovary

돼지난소에서 난포폐쇄시 과립층세포의 아포토시스와 대식세포에 관한 형태학적 연구

  • Park, C.S. (Research Center for Transgenic Cloned Pigs, Chungnam National University) ;
  • Han, S.R. (College of Medicine, Chungnam National Universityv) ;
  • Kim, S.I. (College of Medicine, Chungnam National Universityv) ;
  • Cho, K.J. (College of Medicine, Chungnam National Universityv) ;
  • Kim, W.S. (College of Medicine, Chungnam National Universityv) ;
  • ,
  • 박창식 (충남대학교 형질전환복제돼지연구센터) ;
  • 한승로 (충남대학교 의과대학) ;
  • 김수일 (충남대학교 의과대학) ;
  • 조근자 (충남대학교 의과대학) ;
  • 김원식 (충남대학교 의과대학) ;
  • Published : 2004.08.31
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Abstract

It is known widely that granulosa cell apoptosis leads follicular atresia and macrophages exert their effects directly and/or indirectly from the initiation to the completion of follicular atresia by phagocytosis of apoptotic bodies and secretion of various cytokines. However, the site of initiation, propagation routes and the elimination methods of apoptotic bodies, and the time and methods of penetration of macrophages into the follicles are not known completely. Using pig(Yorkshire-breed) ovary, immunohistochemical studies with TUNEL for apoptotic bodies and pig macrophage monoclonal antibody 4E9 for macrophages, and light and transmission electron microscopic observations were performed. In the pig, follicular atresia began with the granulosa cell apoptosis, and the apoptosis of theca intema cells occured at the same time. The apoptosis of granulosa cells initiated randomly within the granulosa cell layer and propagated rapidly into the whole layer. Ultrastructura1ly, apoptotic granulosa cells showed characteristic pyknotic and deformed nucleus and intracytoplasmic vesicles. Apoptotic bodies were eliminated by intact granulosa cells and macrophages. Intact granulosa cells ingested apoptotic bodies transiently, soon after they fell into the apoptosis. Finally, apoptotic bodies and degenerated oocyte were phagocytosed by macrophages. Macrophages entered the ovarian follicle at the time of initiation of granulosa cell apoptosis, and migrated with the progression of apoptosis. By elimination of theca cells, macrophages contributed the completion of follicular atresia These results will provide valuable informations on the study of the interrelation between macrophage and ovarian follicular atresia.

난포폐쇄는 과립층세포와 난포막세포들의 아포토시스에 의해 이루어지고, 이 과정에 대식 세포는 아포토시스 소체들의 포식작용과 각종 사이토카인 분비를 통해 난포폐쇄의 개시와 완성에 직, 간접적으로 관여함이 널이 보고되어 있다. 그러나 난포 폐쇄시 일어나는 아포노시스가 어디에서부터 개시되고, 어떻게 파급되는지, 아포토시스 소체의 제거방법, 퇴화된 난모세포의 제거 방법, 이들을 제거하는 대식세포의 난포내 진입 시기와 방법 등에 대해서는 아직 확실히 밝혀져 있지 않다. 이에 저자들은 가임기 돼지(Yorkshire-breed)를 실험동물로 난소내 난포의 광학현미경적 및 투과전자현미경적 관찰과 TUNEL 및 돼지 대식세포 단크론항체 4E9를 이용한 면역조직화학적 방법으로 본 연구를 실시하였다. 본 연구 결과, 난포 폐쇄는 과립층세포의 아포토시스로부터 개시되고 그 시기에 난포막 속층 세포들의 아포토시스도 같이 일어나는 것으로 관찰되었다. 과립층세포의 아포토시스는 당해 세포의 과립층내 위치에 관계없이 핵농축으로부터 시작되고 짧은 시간안에 과립층 전체로 파급되고 난모세포를 둘러싸고 있는 괴립층세포의 아포토시스가 가장 마지막에 일어나는 것으로 보인다. 난포 과립층세포의 아포토시스는 핵의 농축과 변형, 세포내 소포들의 출현이 특징적이었고, 아포토시스 소체들은 인접한 정상적인 과립층세포와 대식세포들에 의해 포식되었다. 아포토시스 소체들을 포식한 정상 괴립층세포는 자신도 곧 아포토시스를 일으켜, 이들의 포식작용은 일시적인 것으로 생각된다. 또한 모든 아포토시스 소체들과 퇴화된 난모세포는 대식 세포들이 제거함을 알 수 있었다. 대식세포는 아포토시스의 개시와 함께 난포내로 진입하고, 그 진행과 함께 난포내 모든 부위로 이동하여 아포토시스 소체들과 퇴화 난모세포를 제거하는 것으로 보인다. 처음부터 난포막에 있던 일부 대식세포들은, 아포토시스를 일으켜 난포 바닥막을 와해시킨 난포막세포들의 아포토시스 소체들을 제거하여, 폐쇄된 난포의 난소 실질화를 통해 난포 폐쇄의 완성에 기여하는 것으로 보인다.

Keywords

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