在疟疾寄生虫中的血红素晶体运动的化学推进
Erica M Hastings1, Tomasz Skóra2,3, Keith R Carney3,4
1Department of Biochemistry, University of Utah School of Medicine, Salt Lake City, UT 84112.
概括
疟疾寄生虫使用hemozoin晶体来排毒heme. 这些晶体比预期的更快地移动,由过氧化驱动,作为自动供电的纳米粒子来减少寄生虫的氧化应激.
科学领域:
- 生物物理学的生物物理.
- 寄生虫学的寄生虫学
- 细胞生物学 细胞生物学
背景情况:
- 疟疾寄生虫消化血红蛋白,在食物真空中释放有毒的血红素.
- 血红素晶体形成以排毒血红素,对寄生虫生存和抗疟疾药物标至关重要.
- 血红素晶体的运动及其在寄生虫中的机制仍然不太清楚.
研究的目的:
- 为了研究疟疾寄生虫内血红素晶体的运动动态.
- 为了阐明驱动血红素晶体运动的潜在机制.
- 确定血红细胞运动在寄生虫生存中的生理作用.
主要方法:
- 定量图像分析以确定运动时间尺度.
- 单粒子跟踪和布朗动力学模拟.
- 对过氧化水平及其对晶体运动的影响的实验性操纵.
主要成果:
- 血族的运动是紧密的限制,但比热扩散预测的要快得多.
- 过氧化刺激血红素晶体的运动,无论是孤立的还是寄生虫的内部.
- 抑制过氧化物形成与寄生虫内部的血红细胞运动减少有关.
- 在hemozoin上的表面暴露的金属催化过氧化物分解,产生推进能量.
结论:
- 血红素运动是由过氧化的表面催化分解驱动的,作为内源性自行推进的纳米粒子起作用.
- 这种推进机制可能会减轻在血液阶段感染期间由血质解毒引起的氧化应激.
- 了解hemozoin运动提供了对寄生虫生存策略和潜在的新型抗疟疾干预措施的见解.
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