Oxidative Stress Inhibits Apoptosis in Human Lymphoma Cells

Yang-ja Lee and Emily Shacter

The Journal of Biological Chemistry Vol. 274, No. 28, July 9, pp. 19792-19798, 1999

學生: 萬竹芸 (g884248)

摘要

細胞受到不同刺激而造成細胞死亡的方式有apoptosis及necrosis. 過去研究顯示:在人類B淋巴瘤細胞(human B lyphoma cell, 簡稱BL cell)處理H2O2時, 發現細胞以necrosis的形式死亡. 為了進一了解步過氧化逆境(oxidative stress)對BL cells之死亡方式的影響, 作者將H2O2與會誘導細胞apoptosis 之抗癌藥物(例:VP-16)或calcium ionophore A23187共同處理. 透過以螢光顯微鏡看細胞外觀. Annexin V的結合量. DNA fragmentation. . caspase活性及加入poly(ADP-ribose)polymerase inhibitor(簡稱PARP inhibitor)---3AB或4HQ等等方式, 觀察細胞死亡的情形. 由實驗的結果證實: 當H2O2和VP-16或A23187共同存在時, 並不會造成BL cells之apoptosis, 而是necrosis, 此與單獨處理H2O2的情況類似. 主要的原因是: H2O2會降低BL cells的ATP含量, 趨使細胞以necrosis的形式死亡.

Reference:

  1. Lee, Y.-J., and Shacter, E. (1997) Annexin V for flow cytometric detection of phosphatidylserine expression on B cells undergoing apoptosis. Blood 89, 4480-4492
  2. Nicholson, D. W., ahd Thornberry, N. A. (1997) Caspases: killer proteases. Trends Biochem. Sci. 22, 299-306
  3. Banasik, M., Komura, H., Shimoyama, M., and Ueda, K. (1992) Specific inhibirors of poly(ADP-ribose)synthetase and mono(ADP-ribosyl)transferase. J. Biol. Chem. 267, 1569-1575

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