Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:P47989 (xanthine oxidase)
 8,633 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Microvascular endothelial cells (CMECs) oxidative damage resulting from hypoxia/reoxygenation (H/R) injury is responsible for microcirculation perfusion disturbances and the progression of cardiac dysfunction. However, few strategies are available to reverse such pathologies. Here, we studied the effects and mechanisms of liraglutide on CEMCs oxidative damage, focusing in particular on calcium overload-triggered free radical injury signals and the GLP-1R/PI3K/Akt/survivin survival pathways. The results indicate that H/R increased IP3R expression but reduced SERCA2a expression, which rapidly raised intracellular Ca(2+) levels, subsequently leading to Ca(2+)-dependent xanthine oxidase (XO) activation, reactive oxygen species (ROS) production and the cellular apoptosis of CMECs. However, liraglutide pretreatment abrogated Ca(2+)-mediated oxidative apoptosis. Furthermore, liraglutide regulated the rate of IP3R/SERCA2a gene transcription and conserved SERCA2a-ATPase activity via the maintenance of ATP production under H/R, which drove excessive Ca(2+) reflux to the sarcoplasmic reticulum (SR) and inhibited Ca(2+) release from the SR, ultimately restoring Ca(2+) homeostasis. Furthermore, the regulatory role of liraglutide on Ca(2+) balance in conjunction with its up-regulation of superoxide dismutase, glutathione and glutathione peroxidase collectively scavenged the excess ROS under H/R. Moreover, we showed that liraglutide strengthened Akt phosphorylation and subsequently survivin expression. In addition, both the blockade of the GLP-1R/PI3K/Akt pathways and the siRNA-mediated knockdown of survivin abolished the protective effects of liraglutide on SR-Ca(2+) function and CMECs oxidative apoptosis. In summary, this study confirmed that H/R induced CMECs oxidative damage through the SR-Ca(2+)-XO-ROS injury signals and that liraglutide pretreatment may suppress such CMECs damage through the PI3K/Akt/survivin pathways.
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PMID:Liraglutide protects cardiac microvascular endothelial cells against hypoxia/reoxygenation injury through the suppression of the SR-Ca(2+)-XO-ROS axis via activation of the GLP-1R/PI3K/Akt/survivin pathways. 2703 35

There is an unmet need for new strategies to prevent or postpone the development of diabetic kidney disease. The pathophysiology of this condition includes as a central mechanism an imbalance between the excessive production of reactive oxygen species (ROS) and inadequate anti-oxidant defense. Reduction of ROS is therefore an interesting therapeutic target that warrants further investigation. Herein, we review the drivers of oxidative stress in diabetic kidney disease including NADPH oxidases, mitochondrial ROS production, xanthine oxidase, cytochrome P450, uncoupled eNOS and lipoxygenase. Secondly, the role of anti-oxidative mechanisms in diabetic kidney disease is discussed including the role of the kelch-like ECH-associated protein 1- nuclear factor erythroid 2-related factor 2, lipoxin, oral anti-oxidants and glutathione peroxidase-1. We will also review data supporting the concept that the beneficial renal effects of anti-diabetic drugs that target the glucagon-like peptide 1 receptor and the sodium glucose transporter 2 are, at least in part, due to their impact on oxidative stress in diabetic kidney disease. In the present article we critically evaluate both preclinical studies with cell culture experiments and animal models of diabetic kidney disease as well as covering the current findings from clinical studies addressing targeted interventions towards these pathways.
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PMID:Targeting oxidative stress and anti-oxidant defence in diabetic kidney disease. 3244 17