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흰쥐 신경교종세포에서 카드뮴 세포독성에 대한 키토산의 효과
백용아(Yong-Ah Baik),이정래(Jeoung-Rae Lee),김강득(Gang-Deuk Kim),김혜원(Hye-Won Kim),이한솔(Han-Sol Lee),허정무(Jung-Mu Hur),오재민(Jay-Min Oh),최민규(Min-Kyu Choi),정연태(Yeun-Tai Chung) 한국독성학회 2004 Toxicological Research Vol.20 No.1
Casapse-3 protease is known as a key role of apoptotic enzyme, and caspase-3 activity is a central event that occurs upstream of DNA fragmentation during apoptosis. This study demonstrates that chitosan pretreatment inhibits cadmium-induced apoptosis by attenuating the activity of caspase-3. We also analyzed the protective effect of chitosan on DNA fragmentation induced by cadmium. Cadmium toxicity was examined by DNA fragmentation and nuclear condensation with Hoechst stain. Caspase-3 activities were increased cadmium treated group for 3 hours compared with control. When chitosan (150 mg/ml) was pretreated at 30 min before cadmium treatment, cadmium cytotoxicity was suppressed in a dose-dependent manner evaluated by DNA fragmentation and caspase activity. From these results, it is suggest that the protective effect of chitosan pretreatment against cadmium-induced cytotoxicity is mediated through inhibition of caspase-3 protease activation and DNA fragmentation.