용존 Cd과 Zn에 노출된 굴 (Crassostrea gigas) 의 기관별 금속 축적과 세포 내 결합특성 (Accumulation and subcellular partitioning of Cd and Zn in the Oyster (Crassostrea gigas))

서지정보

· 발행기관 : 한국패류학회
· 수록지 정보 : The Korean Journal of Malacology / 33권 / 4호 / 233 ~ 241페이지
· 저자명 : 양송이, 정선경, 이병권

초록

A radiotracer study was conducted to investigate bioaccumulation and subcellular partitioning of Cd and Zn in the different organs (gills, digestive glands and residue tissues) of the oyster (Crassostrea gigas) during 3-week exposure to water-borne source (with and without 20 μg Cd L-1 and 100 μg Zn L-1) and 3-week depuration in uncontaminated seawater. Cd and Zn in the whole soft tissue and individual organs continuously increased during 3-week exposure. Following 3-week exposure, metal concentrations in the gill tissue was 3.3-6 X Cd and 1.5-2.5 X Zn in two other organs while Cd and Zn in digestive glands was about twice the concentrations in residue tissues. The release rate of Zn (1.9% d-1) was a little faster than Cd (1.6% d-1) during 3-week depuration. Cd and Zn in the three organs was mostly in the detoxified form as metal rich granule, where > 60% in gills and residue tissues while > 30% in digestive glands. The Cd and Zn associated with metallothionein-like proteins was < 10% in the all organs. The potentially toxic and metabolically sensitive fractions (organelles and heat-sensitive protein) of Cd and Zn in the gill and residue tissues ranged 18-31%, while that in digestive glands was 47% for Cd and 36% for Zn. The trophically transferable fractions ranged 29-52% for Cd and 22-39% for Zn in the all organs. The results provide some clue to understand why oyster could accumulate unusually high concentrations of heavy metals and could habitat in metal contaminated environment.

영어초록

A radiotracer study was conducted to investigate bioaccumulation and subcellular partitioning of Cd and Zn in the different organs (gills, digestive glands and residue tissues) of the oyster (Crassostrea gigas) during 3-week exposure to water-borne source (with and without 20 μg Cd L-1 and 100 μg Zn L-1) and 3-week depuration in uncontaminated seawater. Cd and Zn in the whole soft tissue and individual organs continuously increased during 3-week exposure. Following 3-week exposure, metal concentrations in the gill tissue was 3.3-6 X Cd and 1.5-2.5 X Zn in two other organs while Cd and Zn in digestive glands was about twice the concentrations in residue tissues. The release rate of Zn (1.9% d-1) was a little faster than Cd (1.6% d-1) during 3-week depuration. Cd and Zn in the three organs was mostly in the detoxified form as metal rich granule, where > 60% in gills and residue tissues while > 30% in digestive glands. The Cd and Zn associated with metallothionein-like proteins was < 10% in the all organs. The potentially toxic and metabolically sensitive fractions (organelles and heat-sensitive protein) of Cd and Zn in the gill and residue tissues ranged 18-31%, while that in digestive glands was 47% for Cd and 36% for Zn. The trophically transferable fractions ranged 29-52% for Cd and 22-39% for Zn in the all organs. The results provide some clue to understand why oyster could accumulate unusually high concentrations of heavy metals and could habitat in metal contaminated environment.

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