数字农科院2.0

Tick HRF-dependent ferroptosis pathway to promote tick acquisition of Babesia microti

文献类型： 外文期刊

作者： Songqin Chen;Shanming Hu;Yongzhi Zhou;Jie Cao;Houshuang Zhang;Yanan Wang;Jinlin Zhou

作者机构：

关键词： Babesia microti;ferroptosis;HRF;infection;ticks

期刊名称： Frontiers in Cellular and Infection Microbiology

ISSN： 2235-2988

年卷期： 2025 年 15 卷

页码：

收录情况： SCIE（2025版）

摘要： B. microti is a tick-transmitted zoonotic erythrocytic intracellular parasite. Ferroptosis is an iron-dependent form of programmed cell death that affects pathogen replication in the host. Currently, there is limited research concerning the effect of tick ferroptosis on Babesia infection and the underlying mechanism of action. The present study used a B. microti -mouse- Haemaphysalis longicornis infection model in which nymphs fed on the blood of B. microti-infected mice. The midgut divalent iron (p<0.01) and reactive oxygen species (ROS) (p<0.05) levels were significantly elevated in infected ticks, and transmission electron microscopy (TEM) showed that mitochondrial ridges were absent or decreased in size. Downregulation of ferritin 1 and glutathione peroxidase 4 (GPX4) in ticks infected with B. microti suggests that these changes promote ferroptosis. In vivo studies demonstrated that the ferroptosis promoter Erastin increased B. microti load (p<0.05), while the inhibitor Ferrostatin-1 effectively decreased load (p<0.01). Tick histamine-releasing factor (HRF), a protein related to the antioxidant system, was downregulated in infected nymphs compared with uninfected nymphs (p<0.05), and interference with HRF promoted tick acquisition of B. microti (p<0.001). Transcriptomic analyses showed that HRF interference promotes tick ferroptosis by downregulating ferritin 1 and GPX4. Meanwhile, interference with tick HRF molecules showed increased divalent iron and ROS and decreased mitochondrial ridges compared with controls. These findings highlight the critical role of tick HRF molecules in regulating ferroptosis and acquisition of B. microti, thereby providing important insights for a deeper understanding of the tick-Babesia interaction.

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