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Protection of LLC-PK1 Cells Against Hydrogen Peroxide­Induced Cell Death by Modulation of Ceramide Level
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  • Protection of LLC-PK1 Cells Against Hydrogen Peroxide­Induced Cell Death by Modulation of Ceramide Level
  • Protection of LLC-PK1 Cells Against Hydrogen Peroxide­Induced Cell Death by Modulation of Ceramide Level
저자명
Yoo. Jae Myung,Lee. Youn Sun,Choi. Heon Kyo,Lee. Yong Moon,Hong. Jin Tae,Yun. Yeo Pyo,Oh. Seik Wan,Yoo. Hwan Soo
간행물명
Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea
권/호정보
2005년|28권 3호|pp.311-318 (8 pages)
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대한약학회
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정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

Oxidative stress has been reported to elevate ceramide level during cell death. The purpose of the present study was to modulate cell death in relation to cellular glutathione (GSH) level and GST (glutathione S-transferase) expression by regulating the sphingolipid metabolism. LLC­PK1 cells were treated with H$_2$O$_2$ in the absence of serum to induce cell death. Subsequent to exposure to H$_2$O$_2$, LLC-PK1 cells were treated with desipramine, sphingomyelinase inhibitor, and N-acetylcysteine (NAC), GSH substrate. Based on comparative visual observation with H202-treated control cells, it was observed that 0.5 $mu$M of desipramine and 25 $mu$M of NAC exhibited about 90 and $95\%$ of cytoprotection, respectively, against H$_2$O$_2$-induced cell death. Desipramine and NAC lowered the release of LDH activity by 36 and $3\%$ respectively, when compared to $71\%$ in H$_2$O$_2$-exposed cells. Cellular glutathione level in 500 $mu$M H202-treated cells was reduced to 890 pmol as compared to control level of 1198 pmol per mg protein. GST P1-1 expression was decreased in H$_2$O$_2$-treated cells compared to healthy normal cells. In conclusion, it has been inferred that H$_2$O$_2$-induced cell death is closely related to cellular GSH level and GST P1-1 expression in LLC-PK1 cells and occurs via ceramide elevation by sphingomyelinase activation.