异构体维素及其单个单体子单元在RPE细胞上显示出动态的结构-功能关系
Yulia Petsevа1, Kirilka Mladenova1, Maria Ganeva1
1Sofia University "St. Kliment Ohridski", Faculty of Biology, Department of Biochemistry, Sofia, Bulgaria.
Archives of biochemistry and biophysics
|February 20, 2025
概括
蛇毒脂酶A2 (svPLA2) 子单元,维素基本成分 (VBC) 和维素酸性成分 (VAC) 对视网膜色素上皮细胞表现出明显的细胞毒性和基因毒性作用. 它们的相互作用决定了基于细胞微环境的各种生物活动.
科学领域:
- 毒理学 毒理学 毒理学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 蛇毒脂酶A2 (svPLA2) 是具有多种催化和非催化活性的强毒素.
- 维波辛是一种来自Vipera ammodytes毒素的异构体神经毒素,包括一种催化子单元 (VBC) 和一种非活性子单元 (VAC).
- 视网膜色素上皮细胞 (RPE) 对于视网膜健康至关重要,可以成为毒素的目标.
研究的目的:
- 研究vipoxin的亚单元 (VBC和VAC) 在RPE细胞中的特定作用和相互作用.
- 阐明维波辛诱导的细胞反应背后的机制,包括细胞毒性和基因毒性.
- 根据RPE细胞特征,确定子单元相互作用如何影响生物活性.
主要方法:
- 隔离和分离vipoxin异构体成VBC和VAC子单元.
- 用vipoxin及其子单元对两个RPE细胞系 (RPE-1和ARPE-19) 的治疗.
- 评估细胞活力,细胞毒性,细胞骨完整性,体抵抗性,细胞亡和DNA损伤.
- 对p38 MAPK信号通路激活的分析.
主要成果:
- 在RPE细胞中,VBC和VAC子单元都诱导了细胞毒性,细胞骨变化,细胞亡和基因毒性.
- 在RPE-1细胞中,VBC表现出更明显的催化和药理作用,导致显著的DNA损伤和细胞毒性 (高达45%).
- 虽然VAC对膜完整性的影响很小,但在ARPE-19细胞中诱导了大量的DNA损伤.
- 维波辛的复杂活动是由子单元相互作用和RPE细胞微环境调节的.
结论:
- 维素子单元 (VBC和VAC) 具有独特而强大的生物活性,影响RPE细胞完整性和活力.
- 催化 (VBC) 和非催化 (VAC) 机制有助于维素的毒性,对RPE细胞系有不同的影响.
- VBC和VAC之间的相互作用对于调节vipoxin复杂的生物功能至关重要,受RPE细胞特异性因素的影响.
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