在DNA氧化过程中,8-oxoguanine的振荡形成
Blánaid White1, Malcolm R Smyth, James D Stuart
1Department of Chemistry, University of Connecticut, U-60, 55 North Eagleville Road, Storrs, CT 06269-3060, USA.
Journal of the American Chemical Society
|May 29, 2003
概括
由基激素引起的氧化DNA损伤导致波动的8-oxoguanine水平,而不是稳定状态. 这种复杂的氧化模式,包括5-guanidinohydantoin的形成,影响其作为生物标记物的使用.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 氧化压力研究研究 氧化压力研究
背景情况:
- 关氨酸氧化是DNA损伤的一个关键标记.
- 基基是强大的氧化剂,涉及到细胞损伤.
- 了解DNA氧化机制对于疾病研究至关重要.
研究的目的:
- 为了研究瓜和DNA由基激素的氧化产物.
- 在氧化过程中分析8-oxoguanine的度动态.
- 为了确定瓜氧化过程中的潜在中间体和最终产品.
主要方法:
- 使用芬顿试剂生成基基.
- 自由关氨酸和鱼丸DNA的氧化.
- 使用质谱学量化8-oxoguanine的量化.
- 氧化产品的检测和识别.
主要成果:
- 在氧化过程中观察到8-oxoguanine的振荡度.
- 随着时间的推移,[8-oxoguanine]/[8-oxoguanine] + [guanine]) 的比例正在下降.
- 确定了8-oxoguanine和5-guanidinohydantoin作为氧化产物.
- 建议5 - 瓜尼迪诺坦因作为8 - 氧古安宁氧化产物.
结论:
- 瓜因被基激素氧化导致复杂的,非稳定状态的动态.
- 形成5 - 瓜尼迪诺 - 坦因表明进一步氧化8-oxoguanine.
- 振荡性8-oxoguanine水平可能会使其作为氧化DNA损伤的直接生物标志物的实用性复杂化.
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