category
bioRxiv
date
Mar 23, 2026
slug
status
Published
summary
发现伤寒沙门氏菌通过耗竭氨基酸池激活整合应激反应(ISR),揭示GCN2在巨噬细胞杀菌中的关键作用;阐明天冬氨酸(asparagine)和mTOR信号通路在宿主与病原体营养竞争中的核心调控机制。
tags
基因编辑
蛋白质组学
type
Post
📄 原文题目
Salmonella Typhi asparaginase-dependent activation of GCN2 promotes bacterial killing in murine macrophages
🔗 原文链接
💡 AI 核心解读
发现伤寒沙门氏菌通过耗竭氨基酸池激活整合应激反应(ISR),揭示GCN2在巨噬细胞杀菌中的关键作用;阐明天冬氨酸(asparagine)和mTOR信号通路在宿主与病原体营养竞争中的核心调控机制。
📝 英文原版摘要
Many intracellular pathogens stimulate host cell stress by directly or indirectly causing an imbalance in host nutrients; depletion of amino acid pools in particular can act as a danger signal to infected cells. Using a restrictive host model of Salmonella enterica serovar Typhi (S. Typhi) infection, we identify early induction the integrated stress response (ISR) by viable bacteria, but not heat-killed bacteria. Genetic deletion of the amino acid sensing ISR kinase GCN2 (also known as EIF2AK4) prevented early ISR activation during S. Typhi infection, and murine macrophages lacking GCN2 show impaired bacterial clearance and decreased cytokine output. Supplementation of wildtype C57BL/6 murine macrophages with only the non-essential amino acid asparagine was sufficient to suppress S. Typhi-induced ISR activation and deletion of S. Typhi ansB, encoding an asparaginase, prevented ISR activation during infection. Pharmacological inhibition of mammalian target of rapamycin (mTOR), the other major amino acid sensing pathway in eukaryotic cells, prevented GCN2 activation and ISR induction in murine macrophages, indicating an upstream role for mTOR in signaling to GCN2. These findings suggest a role for the ISR in macrophage innate immune responses to S. Typhi infection and highlight a potential difference in nutrient-dependent signaling between the S. Typhi-susceptible human host and the restrictive murine host centered around asparagine, mTOR, and GCN2.
- 作者:NotionNext
- 链接:https://tangly1024.com/article/32c48bd6-1f96-8168-9123-ca4f9e2f9feb
- 声明:本文采用 CC BY-NC-SA 4.0 许可协议,转载请注明出处。
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