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Itaconate uptake via SLC13A3 improves hepatic antibacterial innate immunity
Developmental Cell ( IF 10.7 ) Pub Date : 2024-08-07 , DOI: 10.1016/j.devcel.2024.07.011
Chao Chen 1 , Caiyun Liu 2 , Pengkai Sun 2 , Zhenxing Zhang 1 , Zhimin Wang 1 , Ping Liu 1 , Xinjian Li 2
Affiliation  

Itaconate is an immunoregulatory metabolite produced by the mitochondrial enzyme immune-responsive gene 1 (IRG1) in inflammatory macrophages. We recently identified an important mechanism by which itaconate is released from inflammatory macrophages. However, it remains unknown whether extracellular itaconate is taken up by non-myeloid cells to exert immunoregulatory functions. Here, we used a custom-designed CRISPR screen to identify the dicarboxylate transporter solute carrier family 13 member 3 (SLC13A3) as an itaconate importer and to characterize the role of SLC13A3 in itaconate-improved hepatic antibacterial innate immunity. Functionally, liver-specific deletion of Slc13a3 impairs hepatic antibacterial innate immunity in vivo and in vitro. Mechanistically, itaconate uptake via SLC13A3 induces transcription factor EB (TFEB)-dependent lysosomal biogenesis and subsequently improves antibacterial innate immunity in mouse hepatocytes. These findings identify SLC13A3 as a key itaconate importer in mouse hepatocytes and will aid in the development of potent itaconate-based antibacterial therapeutics.

中文翻译:


通过 SLC13A3 摄取衣康酸盐可提高肝脏抗菌先天免疫力



Itaconate 是炎性巨噬细胞中线粒体酶免疫反应基因 1 (IRG1) 产生的免疫调节代谢物。我们最近确定了衣康酸盐从炎性巨噬细胞中释放的重要机制。然而,细胞外衣康酸盐是否被非髓细胞吸收以发挥免疫调节功能仍是未知数。在这里,我们使用定制设计的 CRISPR 筛选来识别二羧酸转运蛋白溶质载体家族 13 成员 3 (SLC13A3) 作为衣康酸盐进口商,并表征SLC13A3在衣康酸盐改善的肝脏抗菌先天免疫中的作用。在功能上,Slc13a3 的肝脏特异性缺失在体内和 体外会损害肝脏抗菌先天免疫 。从机制上讲,通过 SLC13A3 摄取衣康酸盐诱导转录因子 EB (TFEB) 依赖性溶酶体生物发生,随后提高小鼠肝细胞的抗菌先天免疫力。这些发现确定 SLC13A3 是小鼠肝细胞中关键的衣康酸盐进口商,并将有助于开发有效的基于衣康酸盐的抗菌疗法。
更新日期:2024-08-07
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