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Identification of candidate genes and pathways in dexmedetomidine-induced cardioprotection in the rat heart by bioinformatics analysis [miRNA]

ABSTRACT: Differentially expressed miRNAs and mRNAs after dexmedetomidine administration in rat hearts were successfully identified by conducting microarray analysis.

ORGANISM(S): Rattus norvegicus

PROVIDER: GSE126105 | GEO | 2019/02/11

REPOSITORIES: GEO

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Project description:Purpose: Liver tissue regeneration is vital in the restoration of liver function after hepatectomy and liver transplantation. Dexmedetomidine is a highly selective alpha2-adrenergic receptor (A2R) agonist, whichis regarded as a sedative and analgesic medication that is frequently used intra- and postoperatively in hepatic surgery. Owing to its critical role in the protection of multiple organs, the purpose of this study is to investigate the effects of dexmedetomidine on liver regeneration. Methods:Dexmedetomidine 25 μg.kg-1 was injected intraperitoneally 30 minutes before a 70% hepatectomy performed in mice. Blood and liver samples were obtained for analysis after 48 hours. Mouse primary hepatocytes (MPHMPHs) were incubated with 10 μM dexmedetomidine for 24 hours, then analyzed for cell proliferation from mRNA and protein levels. Transcriptome sequencing revealed the potential mechanism of dexmedetomidine promoting liver regeneration, verified by western blot analysis. Loss of function analysis was performed using the selective corresponding antagonist of Dexmedetomidine . Results:25 μg.kg-1 Ddexmedetomidine significantly promoted mouse liver regeneration in vivo. The liver/body weight ratio was elevated following dexmedetomidine preconditiontreatment. ImmunohistochemistryProliferative markers of Ki67, PCNA and cyclin-D1 suggested more hepatocytes enter a state of proliferatimore cell proliferationon in dexmedetomidine group via immunohistochemistry. These effects were also phenocopied in vitro Incubating withwhere 10 µM dexmedetomidine increased MPH proliferation in vitro, detected by Edu and Ki67 immunofluorescence staining. The expression of cyclins, PCNA mRNA, protein expression levels of cyclins and PCNA were higher with dexmedetomidine treatment in vivo and in vitro. The p-AKT, p-GSK3beta and beta-catenin expression levels were elevated by dexmedetomidine. The effect of dexmedetomidine on MPH proliferation and p-AKT, p-GSK3beta and beta-catenin expressionse phenomenon was blocked by atipamezole (ATI, alpha2 adrenoceptor antagonist) pretreatment. Conclusion:Dexmedetomidine activates AKT/GSK3beta/beta-catenin pathway to promote enhance liver regeneration via binding the alpha-2 adrenoreceptor, which would shed light on a potential therapeutic clinical role to protect liver function in a broad of hepatic surgery.

Project description:Pharmacological preconditioning (PC) and postconditioning (PoC), for example, by treatment with the ?2-adrenoreceptor agonist Dexmedetomidine (Dex), protects hearts from ischemia-reperfusion (I/R) injury in experimental studies, however, translation into the clinical setting has been challenging. Acute hyperglycemia adversely affects the outcome of patients with myocardial infarction. Additionally, it also blocks cardioprotection by multiple pharmacological agents. Therefore, we investigated the possible influence of acute hyperglycemia on Dexmedetomidine-induced pre- and postconditioning. Experiments were performed on the hearts of male Wistar rats, which were randomized into 7 groups, placed in an isolated Langendorff system and perfused with Krebs-Henseleit buffer. All hearts underwent 33 min of global ischemia, followed by 60 min of reperfusion. Control (Con) hearts received Krebs-Henseleit buffer (Con KHB), glucose (Con HG) or mannitol (Con NG) as vehicle only. Hearts exposed to hyperglycemia (HG) received KHB, containing 11 mmol/L glucose (an elevated, but commonly used glucose concentration for Langendorff perfused hearts) resulting in a total concentration of 22 mmol/L glucose throughout the whole experiment. To ensure comparable osmolarity with HG conditions, normoglycemic (NG) hearts received mannitol in addition to KHB. Hearts were treated with 3 nM Dexmedetomidine (Dex) before (DexPC) or after ischemia (DexPoC), under hyperglycemic or normoglycemic conditions. Infarct size was determined by triphenyltetrazoliumchloride staining. Acute hyperglycemia had no impact on infarct size compared to the control group with KHB (Con HG: 56 ± 9% ns vs. Con KHB: 56 ± 7%). DexPC reduced infarct size despite elevated glucose levels (DexPC HG: 35 ± 3%, p < 0.05 vs. Con HG). However, treatment with Dex during reperfusion showed no infarct size reduction under hyperglycemic conditions (DexPoC HG: 57 ± 9%, ns vs. Con HG). In contrast, hearts treated with mannitol demonstrated a significant decrease in infarct size compared to the control group (Con NG: 37 ± 3%, p < 0.05 vs. Con KHB). The combination of Dex and mannitol presents exactly opposite results to hearts treated with hyperglycemia. While DexPC completely abrogates infarct reduction through mannitol treatment (DexPC NG: 55 ± 7%, p < 0.05 vs. Con NG), DexPoC had no impact on mannitol-induced infarct size reduction (DexPoC NG: 38 ± 4%, ns vs. Con NG). Acute hyperglycemia inhibits DexPoC, while it has no impact on DexPC. Treatment with mannitol induces cardioprotection. Application of Dex during reperfusion does not influence mannitol-induced infarct size reduction, however, administering Dex before ischemia interferes with mannitol-induced cardioprotection.

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Identification of candidate genes and pathways in dexmedetomidine-induced cardioprotection in the rat heart by bioinformatics analysis [miRNA]

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