Sphingosine-1-phosphate inhibits high glucose-mediated ERK1/2 action in endothelium through induction of MAP kinase phosphatase-3

Angela M. Whetzel, David T. Bolick, Catherine C. Hedrick

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Endothelial activation is a key early event in vascular complications of Type 1 diabetes. The nonobese diabetic (NOD) mouse is a well-characterized model of Type 1 diabetes. We previously reported that Type 1 diabetic NOD mice have increased endothelial activation, with increased production of monocyte chemoattractant protein (MCP)-1 and IL-6, and a 30% increase of surface VCAM-1 expression leading to a fourfold increase in monocyte adhesion to the endothelium. Sphin- gosine-1-phosphate (S1P) prevents monocyte:endothelial interactions in these diabetic NOD mice. Incubation of diabetic NOD endothelial cells (EC) with S1P (100 nmol/l) reduced ERK1/2 phosphorylation by 90%, with no significant changes in total ERK1/2 protein. In the current study, we investigated the mechanism of S1P action on ERK1/2 to reduce activation of diabetic endothelium. S1P caused a significant threefold increase in mitogen-activated kinase phospha- tase-3 (MKP-3) expression in EC. MKP-3 selectively regulates ERK1/2 activity through dephosphorylation. Incubation of diabetic NOD EC with S1P and the S1P 1-selective agonist SEW2871 significantly increased expression of MKP-3 and reduced ERK1/2 phos- phorylation, while incubation with the S1P 1/S1P 3 antagonist VPC23019 decreased the expression of MKP-3, both results supporting a role for S1P 1 in MKP-3 regulation. To mimic the S1P-mediated induction of MKP-3 diabetic NOD EC, we overexpressed MKP-3 in human aortic endothelial cells (HAEC) cultured in elevated glucose (25 mmol/l). Overexpression of MKP-3 in glucose-cultured HAEC decreased ERK1/2 phosphorylation and resulted in decreased mono- cyte:endothelial interactions in a static monocyte adhesion assay. Finally, we used small interfering RNA to MKP-3 and observed increased monocyte adhesion. Moreover, S1P was unable to inhibit monocyte adhesion in the absence of MKP-3. Thus, one mechanism for the anti-inflammatory action of S1P in diabetic EC is inhibition of ERK1/2 phosphorylation through induction of MKP-3 expression via the S1P-S1P1 receptor axis.

Original languageEnglish (US)
Pages (from-to)C339-C345
JournalAmerican Journal of Physiology - Cell Physiology
Volume296
Issue number2
DOIs
StatePublished - Feb 2009
Externally publishedYes

Keywords

  • Extracellular signal-regulated kinase 1/2
  • Mitogen-activated protein kinase phosphatase-3
  • Monocyte adhesion

ASJC Scopus subject areas

  • Physiology
  • Cell Biology

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