Department of Microbiology and Immunology, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK.
Immunohorizons. 2023 Jan 1;7(1):41-48. doi: 10.4049/immunohorizons.2200097.
Group 3 innate lymphocytes (ILC3s) rapidly respond to invading pathogens or inflammatory signals, which requires shifting cellular metabolic demands. Metabolic adaptations regulating ILC3 function are not completely understood. Polyamines are polycationic metabolites that have diverse roles in cellular functions and in immunity regulate immune cell biology, including Th17 cells. Whether polyamines play a role in ILC3 activation is unknown. In this article, we report that the polyamine synthesis pathway is important for ILC3 activation. IL-23-activated mouse ILC3s upregulate ornithine decarboxylase, the enzyme catalyzing the rate-limiting step of the conversion of ornithine to putrescine in polyamine synthesis, with a subsequent increase in putrescine levels. Inhibition of ornithine decarboxylase via a specific inhibitor, α-difluoromethylornithine, reduced levels of IL-22 produced by steady-state or IL-23-activated ILC3s in a putrescine-dependent manner. Thus, the polyamine putrescine is a positive regulator of ILC3 activation. Our results suggest that polyamines represent a potential target for therapeutic modulation of ILC3 activation during infection or inflammatory disorders.
第三组固有淋巴细胞(ILC3)迅速对入侵病原体或炎症信号做出反应,这需要改变细胞的代谢需求。调节 ILC3 功能的代谢适应尚不完全清楚。多胺是带正电荷的代谢物,在细胞功能和免疫调节中具有多种作用,包括调节 Th17 细胞。多胺是否在 ILC3 的激活中起作用尚不清楚。在本文中,我们报告多胺合成途径对 ILC3 的激活很重要。IL-23 激活的小鼠 ILC3 上调鸟氨酸脱羧酶,该酶催化多胺合成中鸟氨酸转化为腐胺的限速步骤,随后腐胺水平增加。通过特异性抑制剂α-二氟甲基鸟氨酸抑制鸟氨酸脱羧酶,以腐胺依赖的方式降低稳态或 IL-23 激活的 ILC3 产生的 IL-22 水平。因此,多胺腐胺是 ILC3 激活的正调节剂。我们的结果表明,多胺代表了感染或炎症性疾病期间调节 ILC3 激活的潜在治疗靶点。
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