A serine-folate metabolic unit controls resistance and tolerance of infection

A serine-folate metabolic unit controls resistance and tolerance of infection
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丝氨酸-叶酸代谢单位控制感染的抵抗力和耐受性

DOI:
10.1101/2022.11.25.517956
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发表时间:
2022
期刊:
--
影响因子:
--
通讯作者:
Grimes K
Grimes K
中科院分区:
--
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作者:
Grimes K

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免疫激活会驱动大多数动物的代谢变化。免疫诱导的代谢变化作为严重或长期感染的病理驱动因素是最明显的,但通常预计它对支持免疫功能和恢复很重要。许多将免疫检测与代谢调节联系起来的信号机制及其具体后果尚不清楚。在这里,我们表明,黑腹果蝇通过改变叶酸循环基因和氨基酸代谢相关酶的表达来应对许多细菌感染。这些变化的最终结果是从糖酵解到丝氨酸和甘氨酸合成的碳流量增加,以及叶酸循环活性从细胞质转移到线粒体。 Astray 和 Nmdmc(这些酶中最容易诱导的两种酶)的免疫诱导转录诱导依赖于 Difandfoxo。迷失或 Nmdm 的丧失会导致感染特异性免疫缺陷。因此,我们的工作展示了一种关键机制,该机制将免疫诱导的代谢信号变化与丝氨酸-叶酸代谢单位联系起来,从而导致免疫功能发生变化。
Immune activation drives metabolic change in most animals. Immune-induced metabolic change is most conspicuous as a driver of pathology in serious or prolonged infection, but it is normally expected to be important to support immune function and recovery. Many of the signalling mechanisms linking immune detection with metabolic regulation, and their specific consequences, are unknown. Here, we show thatDrosophila melanogasterrespond to many bacterial infections by altering expression of genes of the folate cycle and associated enzymes of amino acid metabolism. The net result of these changes is increased flow of carbon from glycolysis into serine and glycine synthesis and a shift of folate cycle activity from the cytosol into the mitochondrion. Immune-induced transcriptional induction ofastrayandNmdmc, the two most-induced of these enzymes, depends onDifandfoxo. Loss ofastrayorNmdmcresults in infection-specific immune defects. Our work thus shows a key mechanism that connects immune-induced changes in metabolic signalling with the serine-folate metabolic unit to result in changed immune function.
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