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Next generation gene sequencing facilitates transcriptome analysis of liver tissue in dexmedetomidine-treated liver resection model mice

ABSTRACT: Next generation gene sequencing facilitates transcriptome analysis of liver tissue in dexmedetomidine-treated liver resection model mice

PROVIDER: PRJNA780542 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR16951266_1.fastq.gz	Fastqsanger.gz
	SRR16951266_2.fastq.gz	Fastqsanger.gz
	SRR16951267_1.fastq.gz	Fastqsanger.gz
	SRR16951267_2.fastq.gz	Fastqsanger.gz
	SRR16951268_1.fastq.gz	Fastqsanger.gz

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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:Following parenchymal loss, the liver regenerates restoring normal mass and metabolic function. Prevailing theories on triggering events leading to regeneration include humoral, metabolic and flow-mediated mechanisms, the latter emphasizing the importance of shear stress mediated nitric oxide (NO) regulation. We aimed to investigate whether the grade of resection and hence the portal venous pressure and sinusoidal shear stress increase, would be reflected in the gene expression profiles in the liver remnant by employing a global porcine cDNA microarray chip with approximately 23 000 genes represented. Six pig livers were resected with 62% (Low Portal Pressure Resection, LPPR) and 75% (High Portal Pressure Resection) resulting in a portal venous pressure increase from a baseline of 6.1 mmHg to 8.2 and 12 mmHg respectively. By sampling consecutive biopsies from the liver remnants we found differentially expressed genes in the HPPR group to have functions related primarily to apoptosis, nitric oxide metabolism and oxidative stress, whereas differentially expressed genes in the LPPR group potentially regulate the cell cycle. Common to both groups was the upregulation of genes regulating inflammation, transport, cell proliferation and development and protein metabolism. Also common to both groups was both up- and downregulation of genes regulating cell-cell signaling, signal transduction, cell adhesion and translation. Genes regulating the metabolism of lipids, hormones, amines, and alcohol were downregulated in both groups. Conclusions: The genetic regenerative response in the liver remnant to varies according to the level of resection. Keywords: time course, treatment comparison Three pigs underwent a 62% liver resection (low-pressure resection, LPR) and three underwent a 75% resection (high-pressure resection, HPR). Biopsies from the liver remnant were taken from all animals at time points 1, 30, 90, minutes and 3, 4 and 6 hours after resection. Expression profiling was conducted by hybridising each sample against a common reference, consisting of liver RNA from an unrelated animal.

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Next generation gene sequencing facilitates transcriptome analysis of liver tissue in dexmedetomidine-treated liver resection model mice

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