细胞毒性与目标DNA分解由表达细胞素和A粒酶A的老鼠基白血病细胞
J W Shiver1, L Su, P A Henkart
1National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
Cell
|October 16, 1992
概括
研究人员设计了老鼠的巨细胞来表达细胞毒性蛋白质,证明了它们强大的杀伤能力. 这项研究突出了酶A在淋巴细胞细胞毒性期间细胞DNA分解中的作用.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
背景情况:
- 细胞毒性淋巴细胞使用颗粒外细胞酶来诱导细胞死亡.
- 在这个过程中,细胞酶 (氨酸) 和大酶A的特定作用需要进一步阐明.
研究的目的:
- 为了研究RBL巨细胞的细胞毒性潜力,这些巨细胞被改造以表达细胞酶和A种大酶.
- 为了确定大酶A对细胞DNA分解的贡献.
主要方法:
- 用细胞解酶和/或大酶A基因感染RBL巨细胞系.
- 评估mRNA和蛋白质表达水平.
- 对红细胞和EL4淋巴瘤点的细胞毒性活动的评估.
- 在目标细胞中分析DNA碎片化.
主要成果:
- 单独表达细胞解酶或与A粒酶一起表达的RBL转化剂对红细胞表现出强烈的细胞毒性.
- 观察到EL4淋巴瘤点的显著溶解 (20% - 60%),而RBL表达了这两种蛋白质.
- 仅表达大酶A的RBL没有细胞毒性活性.
- 目标细胞DNA分解仅在RBL溶解的细胞中观察到,这些细胞表达了细胞解酶和大酶A.
结论:
- 颗粒-外细胞分裂路径可以为非细胞毒性细胞赋予强烈的细胞毒性活性.
- 效应素大酶A在淋巴细胞介导的细胞毒性期间诱导细胞DNA分解中发挥着至关重要的作用.
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