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Metformin reverses gene expression signautres in hyperglycaemics endothelial cells

ABSTRACT: Metformin is a well tolerated and often prescribed treatment for type 2 diabetes. However, the effect of metformin on gene expression in endothelial cells remains unknown. We used RNA-seq to profile gene expression in primary human aortic endothelial cells stimulated with metformin in normoglycaemic and hyperglycaemic conditions. We identified novel pathways in hyperglycaemic endothelial cells that may be involved in the development of endothelial dysfunction. Hyperglycaemic endothelial cells expressed interferon-response pathway genes such as MX1 and IFI27. Transcription factor analysis implicates the activation of STAT1 and IRF1. Co-treatment of hyperglycaemic cells with metformin prevented glucose-dependent changes in gene expression, including interferon response genes. Indeed, the effects of metformin in endothelial cells were dependent on glucose levels. In normoglycaemic cells, metformin subtly regulated changes in gene expression. In contrast, metformin was strongly associated with the reversal of gene expression changes induced by hyperglycaemia.

ORGANISM(S): Homo sapiens

PROVIDER: GSE77522 | GEO | 2019/02/01

REPOSITORIES: GEO

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Project description:Obesity-induced insulin resistance of the liver is characterised by increased gluconeogenesis, which contributes to elevated blood glucose levels in individuals with type 2 diabetes. Research into how fatty acids induce insulin resistance has commonly focused on the induction of insulin resistance. We hypothesise that by shifting focus to the reversal of an insulin resistant phenotype, novel insights can be made into the mechanisms by which insulin resistance can be overcome. Using global gene and lipid expression profiling, we aimed to identify biological pathways altered in parallel with restoration of palmitate-induced deregulation of glucose production using metformin and sodium salicylate. FAO hepatoma cells were treated with palmitate (0.075mM, 48h) with or without metformin (0.25mM) and sodium salicylate (2mM) in the final 24h of palmitate treatment, and effects on glucose production were determined. Microarray followed by gene set enrichment analysis was performed to investigate pathway regulation. A lipidomic analysis (HPLC-MS/MS) and measurement of secreted bile acids and cholesterol were performed. Reversal of palmitate-induced impairment of glucose production by metformin and sodium salicylate was characterised by down-regulated expression of metabolic pathways regulating acetyl-CoA to cholesterol and bile acid biosynthesis. Total levels of intracellular and secreted cholesterol and bile acids were not different between impaired and restored glucose production. Total intracellular levels of diacylgycerol, triacylglycerol and cholesterol esters increased with palmitate (impaired glucose production), however, these were not further altered with metformin and sodium salicylate (restored glucose production). Six individual lipid species containing 18:0 and 18:1 side-chains were reduced by metformin and sodium salicylate. Widespread lipid metabolism changes induced by the reversal of palmitate-induced deregulation of glucose production with metformin and sodium salicylate were identified. While cholesterol and bile acid levels remained unchanged, the flux through these pathways may in part explain these findings. The identification of lipid species containing 18:0 and 18:1 side chains being regulated alongside changes to glucose production may indicate potential mediators of glucose production and insulin resistance. Three-condition experiment, Vehicle, Palmitate (PA) and Palmitate (PA) + Metformin (Met) + Sodium Sailcylate (NaS) with biological replicates: 8 Vehicle, 20 PA and 20 PA+Met+NaS , independently grown and harvested. One replicate per array.

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Metformin reverses gene expression signautres in hyperglycaemics endothelial cells

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