多氯联苯暴露改变高脂饮食喂养小鼠肝脏中的tRNA转录组。
Polychlorinated Biphenyl Exposure Alters tRNA Transcriptome in High-Fat Diet-Fed Mouse Liver.
作者信息
Klinge Carolyn M, Chariker Julia H, Piell Kellianne M, Petri Belinda J, Rouchka Eric C, Cave Matthew C
机构信息
Department of Biochemistry and Molecular Genetics, University of Louisville School of Medicine, Louisville, KY 40202, USA.
Center for Integrative Environmental Health Sciences (CIEHS), University of Louisville, Louisville, KY 40292, USA.
出版信息
Noncoding RNA. 2025 May 22;11(3):41. doi: 10.3390/ncrna11030041.
Exposure of high-fat diet (HFD)-fed mice to polychlorinated biphenyls (PCBs) results in metabolic dysfunction-associated steatotic liver disease (MASLD) and progression to metabolic dysfunction-associated steatohepatitis (MASH). The mechanisms by which HFD diet and PCBs increase MASLD are unclear. Previously, we identified differences in HFD-fed mouse liver tRNA modifications with single oral exposures to the dioxin-like PCB126, the non-dioxin-like PCB mixture Aroclor 1260 (Ar1260), or the combination of Ar1260 + PCB126. Here, we used small RNA sequencing and the tRNA analysis of expression (tRAX) pipeline to examine if PCB exposures alter the tRNA transcriptome, including tRNA-derived fragments (tRFs), in the livers of the PCB-exposed mice. Each PCB exposure produced distinct hepatic tRNA transcriptomes with more tRNAs decreased than increased. Only tRNA-Glu-TTC-1 was reduced with all three PCB exposures. More changes in tRFs were identified with Ar1260 alone or in combination with PCB126 than with PCB126 alone. Four tRF-3s were upregulated in both PCB126 and Ar1260 + PCB126 co-exposed mice, suggesting PCB126 as responsible for this increase. We previously reported that PCB126 exposure increased hepatic Angiogenin (ANG) protein which generates tRF-3s. Four previously reported tRNA modifications corresponded to positions of PCB-associated tRNA modifications identified by tRAX: m1A, m6A, ms2t6A, and Ψ. Overall, the differences in hepatic tRNAs and tRFs with three different PCB exposures suggest that PCB exposures play an unexplored role in regulating translation in mouse liver.
给高脂饮食(HFD)喂养的小鼠喂食多氯联苯(PCBs)会导致代谢功能障碍相关脂肪性肝病(MASLD),并进展为代谢功能障碍相关脂肪性肝炎(MASH)。HFD饮食和PCBs增加MASLD的机制尚不清楚。此前,我们通过单次口服二恶英样多氯联苯126、非二恶英样多氯联苯混合物Aroclor 1260(Ar1260)或Ar1260 + 多氯联苯126的组合,确定了HFD喂养小鼠肝脏tRNA修饰的差异。在这里,我们使用小RNA测序和tRNA表达分析(tRAX)流程来检查多氯联苯暴露是否会改变多氯联苯暴露小鼠肝脏中的tRNA转录组,包括tRNA衍生片段(tRFs)。每种多氯联苯暴露都会产生独特的肝脏tRNA转录组,tRNA减少的比增加的更多。只有tRNA-Glu-TTC-1在所有三种多氯联苯暴露中都减少。与单独使用多氯联苯126相比,单独使用Ar1260或与多氯联苯126联合使用时,tRFs的变化更多。在多氯联苯126和Ar1260 + 多氯联苯126共同暴露的小鼠中,有四种tRF-3s上调,表明多氯联苯126是这种增加的原因。我们之前报道过,多氯联苯126暴露会增加肝脏血管生成素(ANG)蛋白,该蛋白会产生tRF-3s。之前报道的四种tRNA修饰与tRAX鉴定的多氯联苯相关tRNA修饰的位置相对应:m1A、m6A、ms2t6A和Ψ。总体而言,三种不同多氯联苯暴露下肝脏tRNA和tRFs的差异表明,多氯联苯暴露在调节小鼠肝脏翻译中发挥着尚未被探索的作用。