아연 축적으로 인한 붕어(Carassius auratus) 조직의 변화

Changes of Carassius auratus Tissues by Zn Accumulation

  • 신명자 (안동대학교 자연과학대학 생명과학과) ;
  • 이종은 (안동대학교 자연과학대학 생명과학과) ;
  • 서을원 (안동대학교 자연과학대학 생명과학과)
  • Shin, Myung-Ja (Department of Biological Science, Andong National University) ;
  • Lee, Jong-Eun (Department of Biological Science, Andong National University) ;
  • Seo, Eul-Won (Department of Biological Science, Andong National University)
  • 투고 : 2011.02.01
  • 심사 : 2011.03.04
  • 발행 : 2011.03.31

초록

본 연구는 Zn의 노출조건에서 Zn의 농도가 어류의 조직과 생리에 미치는 영향을 조사하기 위하여 붕어의 아가미, 선장, 간, 뼈 및 근육 조직을 사용하였다. 아가미, 뼈와 근육 조직에서 Zn의 축적 농도는 노출 40일에 증가하였다. 또한 아가미 조직 내 Zn의 축적량은 다른 조직에 비해 높았으며, 모든 조직에서 노출기간이 걸어질수록 증가하였다. Zn에 노출된 아가미, 신장, 간과 근육 조직의 항산화효소의 활성은 노출기간이 걸어질수록 증가하였다. 또한 Zn에 노출된 아가미, 선장, 간과 근육 조직의 항산화효소 활성은 아가미와 간 조직에서 높았으며, 신장 조직에서 가장 낮은 활성을 보였다. 농도가 높고 노출기간이 걸어질수록 아가미 조직에서는 이차새변의 간격이 불규칙해지고, 점액 세포 수가 증가하였다. 곤봉화, 부종, 상피세포의 박리가 이차새변에서 관찰되었다. 또한 40 일간 Zn에 노출된 아가미 조직 내 미토콘드리아와 핵에서는 막의 손상이 관찰되었다. 신장 조직 내 사구체는 수축되어 보우만 주머니의 공간이 넓게 관찰되었다. 이러한 결과로 보아 고농도의 Zn 노출은 어류의 호흡과 배설 장애등 심각한 조직, 생리적 장애를 가져 올 수 있을 것으로 사료된다.

Present study aimed to investigate the effect of zinc accumulation on the tissues of Carassius auratus with various rearing condition. Heavy metal, Zn, was accumulated in the gill, bone and muscle increased for exposure period of 40 days. Moreover, the accumulated concentration of Zn in the gill showed relatively higher than that in other tissues. Also, activities of antioxidant enzymes in the gill, kidney, liver and muscle tissues after exposure to Zn were increased in the manner of exposure period. Antioxidant enzyme activities were shown higher in the gill and muscle than those in the kidney and liver tissues. The gill of C. auratus showed abnormal shapes in its secondary lamellae by long time exposure condition and determined the increased numbers of mucous cells in gill exposed to Zn. In addition, the edema, the exfoliation of epithelial cell was shown in the gill and membrane damages were observed in mitochondria and nucleus. In the kidney, we observed not only the atrophied glomerulus, but the expansion of empty space in Bowman's capsule. Based on the above results, it is considered that the exposure to the high level of Zn for long period possibly involves in the decrease of respiratory and excretory rates, giving rise to secondary lesion of tissues.

키워드

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