Mechanistic studies of PEG-asparaginase-induced liver injury and hepatic steatosis in mice

• 作者: Gundala Venkata Naveen Kumar Keito Hoshitsuki Sanjay Rathod Manda J.Ramsey Lauren Kokai Erin E.Kershaw Wen Xie Christian A.Fernandez
• 来源期刊: 药学学报（英文版）
• 年，卷（期）: 2021,（12）
• 所属期刊栏目: Original articles
• 页码范围: 3779-3790
• 页数: 12页
• 语种: 英文

摘要

PEGylated-L-asparaginase(PEG-ASNase)is a chemotherapeutic agent used to treat pediatric acute lymphoblastic leukemia(ALL).Its use is avoided in adults due to its high risk of liver injury including hepatic steatosis,with obesity and older age considered risk factors of the injury.Our study aims to elucidate the mechanism of PEG-ASNase-induced liver injury.Mice received 1500 U/kg of PEG-ASNase and were sacrificed 1,3,5,and 7 days after drug administration.Liver triglycerides were quantified,and plasma bilirubin,ALT,AST,and non-esterified fatty acids(NEFA)were measured.The mRNA and protein levels of genes involved in hepatic fatty acid synthesis,β-oxidation,very low-density lipoprotein(VLDL)secretion,and white adipose tissue(WAT)lipolysis were determined.Mice devel-oped hepatic steatosis after PEG-ASNase,which associated with increases in bilirubin,ALT,and AST.The hepatic genes Ppara,Lcad/Mcad,Hadhb,Apob100,and Mttp were upregulated,and Srebp-1c and Fas were downregulated after PEG-ASNase.Increased plasma NEFA,WAT loss,and adipose tissue lipol-ysis were also observed after PEG-ASNase.Furthermore,we found that PEG-ASNase-induced liver injury was exacerbated in obese and aged mice,consistent with clinical studies of ASNase-induced liver injury.Our data suggest that PEG-ASNase-induced liver injury is due to drug-induced lipolysis and lipid redistribution to the liver.