Title : Hydrogen peroxide-induced VCAM-1 expression in pancreatic islets and beta-cells through extracellular Ca2+ influx.

Pub. Date : 2008 Nov 15

PMID : 19005408






11 Functional Relationships(s)
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1 Hydrogen peroxide-induced VCAM-1 expression in pancreatic islets and beta-cells through extracellular Ca2+ influx. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
2 The role of Ca2+ in H2O2-induced VCAM-1 expression was investigated in beta-cell lines using an extracellular Ca2+ chelator and Ca2+-depleted media. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
3 Furthermore, H2O2-induced VCAM-1 expression was measured in beta-cells, pretreated with inhibitors of protein kinase C, phospholipase D, and phosphatidylinositol-3 kinase/Akt. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
4 Finally, H2O2-induced VCAM-1 expression was evaluated in porcine islets and rodent beta-cell lines infected with an adenovirus encoding catalase, a H2O2-removing enzyme. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
5 Finally, H2O2-induced VCAM-1 expression was evaluated in porcine islets and rodent beta-cell lines infected with an adenovirus encoding catalase, a H2O2-removing enzyme. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
6 RESULTS: H2O2 was most potent inflammatory stimulator of VCAM-1 expression in porcine islets and had the greatest effect on VCAM-1 expression by beta-cells. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
7 RESULTS: H2O2 was most potent inflammatory stimulator of VCAM-1 expression in porcine islets and had the greatest effect on VCAM-1 expression by beta-cells. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
8 Signaling pathway analysis demonstrated that extracellular Ca2+ influx was critical to H2O2-mediated VCAM-1 expression; however, protein kinase C, phospholipase D, and phosphatidylinositol-3 kinase/Akt activation were not required for VCAM-1 expression. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
9 Signaling pathway analysis demonstrated that extracellular Ca2+ influx was critical to H2O2-mediated VCAM-1 expression; however, protein kinase C, phospholipase D, and phosphatidylinositol-3 kinase/Akt activation were not required for VCAM-1 expression. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
10 Finally, catalase overexpression inhibited H2O2-induced VCAM-1 expression by islets and beta-cell lines. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens
11 CONCLUSION: An extracellular calcium-dependent H2O2 pathway is the critical mediator of VCAM-1 expression by pancreatic islets and beta-cells. Hydrogen Peroxide vascular cell adhesion molecule 1 Homo sapiens