肝内疟原虫的清除是由非经典自噬驱动的,而非一氧化氮的产生。

Elimination of intra-hepatocytic malaria parasites is driven by non-canonical autophagy but not nitric oxide production.

作者信息

Schepis Antonino, Mertens Jonas E, Lewis Patrick, Patel Hardik, Stegman Noah, Reynolds Laura, Minkah Nana K, Kappe Stefan H I

机构信息

Center for Global Infectious Disease Research, Seattle Children's Research Institute, Seattle, WA, USA.

Institute of Tropical Medicine, University of Tübingen, Tübingen, Germany.

出版信息

iScience. 2025 Mar 1;28(4):112052. doi: 10.1016/j.isci.2025.112052. eCollection 2025 Apr 18.

Abstract

Elimination of the malaria parasite intra-hepatocytic liver stages (LS) by innate and adaptive immune cells requires interferon gamma (IFN-γ). The current view in the field posits that IFN-γ-mediated elimination of LS is executed by the induction of intra-hepatocytic nitric oxide (NO). Here, we refute this view and instead show that IFN-γ-driven induction of non-canonical autophagy via gamma-aminobutyric acid receptor-associated proteins (GABARAPs) has a critical functional role in IFN-γ-mediated elimination of LS. Furthermore, mediators of lysosomal maturation and fusion also have important functions in this process. Recruitment of GABARAPs to the LS parasitophorous vacuole (PV) compartment likely promotes the fusion of the PV membrane with lysosomes, thereby leading to elimination of intra-hepatocytic parasites. In contrast, LC3 has an infection-supportive function by protecting LS from GABARAP-mediated elimination. We also found an important role of the reactive oxygen species (ROS)-inducing protein NOX2, indicating a two-pronged host response drives LS elimination.

摘要

先天性和适应性免疫细胞清除肝内疟原虫肝期(LS)需要干扰素γ(IFN-γ)。该领域目前的观点认为,IFN-γ介导的LS清除是通过诱导肝内一氧化氮(NO)来实现的。在此,我们反驳这一观点,转而表明IFN-γ通过γ-氨基丁酸受体相关蛋白(GABARAPs)驱动的非经典自噬诱导在IFN-γ介导的LS清除中具有关键的功能作用。此外,溶酶体成熟和融合的介质在此过程中也具有重要功能。GABARAPs募集到LS的寄生泡(PV)区室可能促进PV膜与溶酶体的融合,从而导致肝内寄生虫的清除。相比之下,LC3通过保护LS免受GABARAP介导的清除而具有感染支持功能。我们还发现了活性氧(ROS)诱导蛋白NOX2的重要作用,表明宿主的双管齐下反应驱动LS清除。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4a17/12131254/3b837110460a/fx1.jpg

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