Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Effects of Different Levels of Oxytetracycline on Physiological and Bio- chemical Responses in Olive Flounder, Paralichthys olivaceus

넙치, Paralichthys olivaceus에서의 Oxytetracyline 처리 농도가 생리ㆍ생화학적 반응에 미치는 영향

  • 양정환 (제주대학교 해양과학부, 해양과환경연구소) ;
  • 여인규 (제주대학교 해양과학부, 해양과환경연구소)
  • Published : 2004.11.01
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Abstract

Olive flounder was treated with oxytetracycline (OTC) and changes in blood physiology, antioxidant enzymes and heat shock protein (HSP) were recorded to obtain preliminary data for optimal OTC treatment. Blood parameters were measured 1 and 3 h after the OTC treatments at the concentration of 0 (control), 100, 300 and 500 ppm for I h. Hematocrit decreased with time, however the difference was not significant (P>0.05). Reduced number of red blood cell was observed with increasing OTC concentration. Serum glucose level increased as the OTC concentration increased. However, glucose level was similar to control after 3 h. Blood total protein decreased immediately after the OTC treatment but increased after 1 and 3 h. However, the increment in blood total protein was low. Activities of superoxide dismutase enzymes in 300 and 500 ppm groups increased by the OTC concentration. Catalase enzyme activity was negatively affected by the OTC concentration. However, the differences were not significant (P>0.05). High expression of HSP-70 protein was recorded for groups treated with 100 and 500 ppm compared to that of the control group. However HSP-70 mRNA showed a lower increment which was not significant (P>0.05).

본 연구에서는 넙치, Paralichthys olivaceus를 이용하여 oxytetracycline (OTC)처리농도에 따른 체내에서 혈액 생리학적인 변화, 항산화 효소 및 열충격단백질(HSP)등의 변화를 조사하여 항생제의 안정적인 사용에 대한 기초 자료를 제공하고자 본 실험을 수행하였다. 실험구는 각각 0 (대조구), 100, 300 및 500ppm으로 설정하였으며, 1시간 약욕처리 후 순환시켜 0, 1 및 3시간 후에 혈액성상을 분석하였다. 혈액 중 hematocrit(Ht)수치는 전 실험구에서 감소하는 경향을 보였으나 유의한 차이는 나타나지 않았다. Red blood cell (RBC)는 농도 의존적으로 감소하는 경향을 나타내었다. 또한, 혈청 글루코오스 농도는 농도 의존적으로 증가되는 경향을 나타내었으나, 노출 이후 3시간 경과 후에는 이전 대조구 수준으로 감소되었다. 혈중 단백질량은 0시간째 전 실험구에서 감소되었다가 이후 증가하는 경향을 나타내었으나, 처리전의 대조구와 비교하여 유의하게 낮은 값을 나타내었다. SOD 효소 활성은 노출 직후 300 및 500ppm에서는 유의하게 높은 값을 나타내었다. CAT효소활성은 OTC처리 농도에 비례하여 감소하는 경향을 보였으나 유의한 차이는 나타내지 않았다. 그리고 HSP-70의 단백질량은 100 ppm및 500 ppm처리구에서 대조구에 비해 높게 발현되는 것이 확인되었다. 그러나 HSP-70 mRNA는 다소 증가하는 경향은 보였으나, 모든 실험구에서 유의한 차이는 나타나지 않았다.

Keywords

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