宿主寄生虫相互作用中的热量动力学和代谢途径,由多种组织中氨基酸的同位素分析揭示
Shaista Khaliq1,2, Milen Nachev3,2, Philip M Riekenberg4,5
1Instrumental Analytical Chemistry, University of Duisburg-Essen, Universitätsstr. 5, 45141, Essen, Germany.
Scientific reports
|September 18, 2025
概括
寄生虫显著改变宿主新陈代谢,如同位素分析在鱼中显示的那样. 这项研究揭示了食物网内的复杂宿主-寄生虫相互作用和营养交换动态.
科学领域:
- 生态生态学 生态生态学
- 同位素地球化学 同位素地球化学
- 寄生虫学的寄生虫学
背景情况:
- 摄食相互作用塑造了食物网和能量流.
- 寄生虫可以显著改变宿主动态和生态假设.
- 化合物特定同位素分析 (CSIA) 提供了对新陈代谢和营养转移的高分辨率洞察.
研究的目的:
- 调查寄生虫的代谢途径和宿主-寄生虫的食物营养动态.
- 使用CSIA.量化宿主-寄生虫系统中的营养分化.
- 了解宿主感染期间的营养同化和代谢转变.
主要方法:
- 进行了一项为期120天的受控养实验,对鱼 (Gasterosteus aculeatus) 和虫寄生虫 (Schistocephalus solidus) 进行了控制.
- 利用特定化合物同位素分析 (CSIA) 来测量宿主组织 (肝脏,肌肉) 和寄生虫中的同位素组成 (δ15N).
- 分析了单个氨基酸的δ15N值,以区分代谢途径和热量链接.
主要成果:
- 寄生虫血清蛋白δ15N显著高于宿主肝脏,表明强烈的代谢联系.
- 寄生虫的生长似乎受到宿主衍生的氨酸转化和葡萄糖生成的支持,由较低的氨酸和较高的氨酸δ15N证明.
- 寄生虫和宿主之间最小的食物位差异 (<0.5‰) 表明宿主产品的直接同化.
- 感染宿主甘氨酸 δ15N随着时间的推移而增加,反映出对免疫反应的代谢需求增加.
结论:
- CSIA揭示了宿主和寄生虫之间的复杂的代谢相互作用和营养物质交换.
- 寄生虫直接影响宿主代谢,改变氨基酸循环和同位素特征.
- 这项研究增强了对生态食物网内的宿主-寄生虫动态的理解.
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