ArticleJournal of diabetes investigation2025
Polyethylene glycol loxenatide modulates lipid metabolism and insulin resistance through lncRNA steroid receptor RNA activator/cellular nucleic acid binding protein/Rho-associated coiled-coil kinase 2 axis in type 2 diabetes mellitus.
Article in Journal of diabetes investigation, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundPolyethylene glycol loxenatide (PEG-Loxe) is applied in treating type 2 diabetes mellitus. Nevertheless, the effect and mechanism of PEG-Loxe on lipid metabolism disorder and insulin resistance in type 2 diabetes mellitus are not fully understood.
methodsType 2 diabetes mellitus rats developed by high-fat diet/streptozotocin injection were treated with PEG-Loxe (0.3 or 1 mg/kg). Insulin resistance was evaluated by fasting blood glucose (FBG), oral glucose tolerance test, fasting insulin, homeostasis model of assessment for insulin resistance and for insulin sensitivity. Immunohistochemistry, hematoxylin and eosin staining, and biochemistry measurements were performed to assess lipid metabolism. Inflammatory response and oxidative stress were assessed by inflammatory cytokines and reactive oxygen species. Genes' expressions were tested using RT-qPCR, western blot, and in situ hybridization. Relationships of molecules were validated by pull-down assay and RNA immunoprecipitation. mRNA stability was examined by actinomycin D assay.
resultsHigh-PEG-Loxe decreased FBG and ameliorated glucose tolerance, hyperinsulinemia, and insulin resistance. Low-PEG-Loxe partly while high-PEG-Loxe apparently relieved hepatocyte injury, reduced lipase I, triglyceride, total cholesterol and leptin, and increased adiponectin in type 2 diabetes mellitus rats. PEG-Loxe mitigated inflammatory response and oxidative stress. High-PEG-Loxe reduced RhoA and Rho-associated coiled-coil kinase 2 (ROCK2) in liver tissues of type 2 diabetes mellitus rats, while both doses of PEG-Loxe decreased steroid receptor RNA activator (SRA). SRA overexpression reversed the protective functions of high-PEG-Loxe. SRA cooperated with cellular nucleic acid binding protein (CNBP) to enhance ROCK2 mRNA stability.
conclusionHigh-PEG-Loxe relieves insulin resistance and lipid metabolism disorder in type 2 diabetes mellitus through SRA/CNBP/ROCK2 axis. This research provides a molecular mechanism of PEG-Loxe for treating type 2 diabetes mellitus.
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