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ISSN : 1225-3480

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25권 2호

카드뮴에 노출된 바지락 (Ruditapes philippinarum) 의 세포성 면역 반응

Cellular Immune Responses of the Manila Clam, Ruditapes philippinarum, Exposed to Cadmium Chloride

박경일 (군산대학교 해양과학대학 수산생명의학과)
최민순 (군산대학교 해양과학대학 수산생명의학과)
박성우 (군산대학교 해양과학대학 수산생명의학과)
박관하 (군산대학교 해양과학대학 수산생명의학과)
최상훈 (군산대학교 해양과학대학 수산생명의학과)
윤종만 (군산대학교 해양과학대학 수산생명의학과)
한국패류학회지 / The Korean Journal of Malacology, (P)1225-3480;
2009, v.25 no.2, pp.135-143
박경일, 최민순, 박성우, 박관하, 최상훈, & 윤종만. (2009). 카드뮴에 노출된 바지락 (Ruditapes philippinarum) 의 세포성 면역 반응, 25(2), 135-143.

초록

바지락 (Ruditapes philippinarum) 은 우리나라 조간대에 널리 분포하며 잘 발달된 생체조절 능력을 가지고 있어 환경모니터링 종으로서 가치가 높은 생물이다. 본 연구는 산업활동으로 해양환경에서 그 농도가 높아지고 있으며 생물체에 강한 독성을 가진 카드뮴이 바지락의 세포성 면역에 미치는 영향을 연구함으로써 바지락의 면역 기작을 이해하고 환경 모니터링 기법으로의 적용 가능성을 조사하기 위하여 실시되었다. 실험을 위하여 바지락은 $50\;{\mu}g/l$의 카드뮴에 8일간 노출되었으며, 유세포 분석기를 이용하여 혈구의 미분화 세포의 구성비율, DNA 손상도, 혈구괴사율, 혈구 apoptosis 비율 및 혈구사망율을 측정하였다. 조사 결과 카드뮴에 노출된 바지락은 대조구와 비교하여 미분화세포, DNA 손상도, 세포괴사율, 세 apoptosis 비율 및 세포 사망율이 통계적으로 유의하게 증가하였다. 특히 apoptosis 비율은 세포괴사율보다 높게 증가함에 따라 바지락 혈구의 경우 본 연구에서 사용된 카드뮴의 농도는 세포괴사보다는 apoptosis를 유도하는데 더 효과적인 농도인 것으로 판단된다. 본 연구를 통하여 중금속 오염에 대한 바지락의 세포성 면역반응은 유세포 분석기를 이용하여 정량이 가능하였으며, 세포성 면역반응을 이용한 환경모니터링에 유용하게 사용될 수 있을 것으로 기대된다.

keywords
ruditapes philippinarum, cadmium chloride, flow cytometry, immune parameter, environmental monitoring

Abstract

The Manila clam, Ruditapes philippinarum, has been considered as a sentinel species due to dominant distribution along the coast of Korea and well developed regulatory system. In order to develop and understand immune responses of the Manila clams, clams were exposed to $50\;{\mu}g/L$ of cadmium chloride (Cd) for 8 days and monitored the cellular immune parameters of the hemocytes including blast cell composition, DNA damage, necrosis, apoptosis and hemocyte mortality using a flow cytometer. The results showed that all immune parameters analyzed in the present study increased remarkably compared to the controls and the increases were statistically significant. Apoptosis rate was higher than necrosis rate in the clams exposed to Cd suggesting that apoptosis was preferably induced by the concentration of Cd used in the present study. Our study indicates that the measurement of cellular immune responses of the Manila clam using flow cytometer will be a useful technique for assessment of heavy metal contamination in marine environment.

keywords
ruditapes philippinarum, cadmium chloride, flow cytometry, immune parameter, environmental monitoring

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