The Korean Journal of Malacology (한국패류학회지)

The Malacological Society of Korea (한국패류학회)
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Ultrastructural Changes in the Mantle of the Equilateral Venus, Gomphina veneriformis (Bivalvia: Veneridae) Exposed to TBTCl

TBTCl 노출에 의한 대복, Gomphina veneriformis (Bivalvia: Veneridae) 외투막의 미세구조적 변화

  • Park, Jung-Jun (Pathology Division, National Fisheries Research and Development Institute) ;
  • Kim, Seok-Ryel (Pathology Division, National Fisheries Research and Development Institute) ;
  • Park, Myoung-Ae (Pathology Division, National Fisheries Research and Development Institute) ;
  • Lee, Jung-Sick (Department of Aqualife Medicine, Chonnam National University)
  • 박정준 (국립수산과학원 병리연구과) ;
  • 김석렬 (국립수산과학원 병리연구과) ;
  • 박명애 (국립수산과학원 병리연구과) ;
  • 이정식 (전남대학교 수산생명의학과)
  • Received : 2011.09.03
  • Accepted : 2011.09.26
  • Published : 2011.09.30
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Abstract

Equilateral venus, Gomphina veneriformis exposed to tribultyltin chloride (TBTCl) for 36 weeks was showed ultrastructural changes of the mantle. The fine mantle had 4-folds and its epidermal layer consisted of simple columnar epithelial cells and ciliated cells and secretory cells. Inner and outer epidermal layer covered connective tissue. The mantle exposed to TBTCl at 12 weeks was decreased cilia in the inner epidermal layer, and observed extension of the hemolymph sinus and destruction of the septum. At 20 weeks, it revealed vacuole formation and pycnosis in the cytoplasm, and scattered muscular fiber. After 28 weeks of exposure, the mantle revealed partially degenerative changes in the epidermal layer. In the ciliated cells, basal body was isolated from the cilia and rootlet complex and basal foot were scattered. The sarcolemma had debris fiber. At 36 weeks, it observed degenerative cells that it revealed disappearance of the cilia, atrophic nucleus, poorly membrane and destruction of the cresternae in the mitochondria, and increasing heterophagosome. The outer epithelial cell had necrotic nuclus, numeous lysosome and disappearance of the microvilli. Therefore, results of this study suggested that chronical TBTCl exposure in the Gomphina veneriformis induced the disorders of shell growth and physiological function with histopathological changes of the mantle.

TBTCl에 36주 동안 노출된 대복, Gomphina veneriformis 의 미세구조적인 변화를 전자현미경으로 관찰하였다. 대복의 외투막은 가장자리에 4개의 주름을 가지며, 내부와 외부상피층이 단층의 원주형 상피세포, 섬모세포, 분비세포로 구성되어 있었다. 이들 상피층은 혈림프동이 존재하는 결합조직층을 둘러싸고 있었다. 대복의 외투막은 TBTCl 노출 12주째 내부상피층에 존재하는 섬모의 수가 감소하였으며, 혈림프동의 확장과 함께 격막의 파괴가 관찰되었다. 노출 20주째 세포질내의 공포형성, 핵응축과 같은 변화가 관찰되었고, 결합조직층에서는 근섬유다발의 분절이 부분적으로 관찰되었다. 노출 28주째 상피층의 부분적인 붕괴, 섬모의 변화 및 섬모세포에 존재하는 미세구조가 괴사되었다. 결합조직층에 존재하는 다수의 근형질막은 팽창되었으며, 막의 내부에는 근섬유들이 대부분 파괴되어 막 주변에 근섬유 잔여물들이 관찰되었다. 노출 36주째에는 섬모들은 모두 탈락되고, 핵 응축되고, 이형소체의 증가가 나타나는 퇴행성 상피세포가 나타났다. 외부상피층의 상피세포들이 괴상되어 핵이 파괴되고, 세포질 내에는 다수의 용해소체들이 가득 차 있었으며, 미세융모들은 대부분 소실되었다. 따라서 만성적인 TBTCl 노출은 대복의 외투막은 각장성장 및 생리적인 기능의 장애를 유발하는 것으로 생각된다.

Keywords

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