Peroxisome proliferator-activated receptor gamma regulates angiotensin II-stimulated phosphatidylinositol 3-kinase and mitogen-activated protein kinase in blood vessels in vivo

Hypertension. 2006 Jan;47(1):102-8. doi: 10.1161/01.HYP.0000196728.05488.c3. Epub 2005 Dec 12.

Abstract

Angiotensin (Ang) II is implicated in hypertension, vascular remodeling, and insulin resistance. Peroxisome proliferator-activated receptor (PPAR) gamma activators increase insulin sensitivity and improve Ang II-induced vascular remodeling. We evaluated the effects of the PPAR-gamma activator rosiglitazone on Ang II signaling in aorta and mesenteric arteries. Rats received Ang II by subcutaneous infusion and/or rosiglitazone per os for 7 days. Blood pressure rise in Ang II-infused rats was attenuated by rosiglitazone. Ang II significantly increased Ang II type 1 receptor expression in the mesenteric arteries (P<0.001), whereas that of the aorta was decreased (P<0.05), changes which were reversed by rosiglitazone. Akt activity was increased by Ang II and returned to basal levels under rosiglitazone in both vascular beds. However, Ang II-induced extracellular signal-regulated kinase 1/2 activity increased in aorta but not in mesenteric vessels (P<0.001), where 4E-binding protein 1 activity was significantly increased by Ang II and inhibited by PPAR-gamma activation. In response to Ang II, Src homology (SH) 2-containing inositol phosphatase 2 activity was increased (P<0.05) in both vascular beds. In conclusion, PPAR-gamma activator rosiglitazone attenuated Ang II-induced blood pressure elevation and intracellular signaling on aorta and mesenteric vessels. There was differential inhibition of Ang II type 1 receptor receptors/phosphatidylinositol 3-kinase/Akt and extracellular signal-regulated kinase 1/2 in both vessels. Effects of PPAR-gamma activators on these pathways could contribute to regression of vascular remodeling in models of hypertension and diabetes and, accordingly, in hypertensive diabetic patients.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Angiotensin II / pharmacology*
  • Animals
  • Aorta / enzymology*
  • Aorta / metabolism
  • Blood Pressure / drug effects
  • Male
  • Mesenteric Arteries / enzymology*
  • Mesenteric Arteries / metabolism
  • Mitogen-Activated Protein Kinases / metabolism*
  • PPAR gamma / metabolism
  • PPAR gamma / physiology*
  • Phosphatidylinositol 3-Kinases / metabolism*
  • Rats
  • Rats, Sprague-Dawley
  • Receptor, Angiotensin, Type 1 / metabolism
  • Rosiglitazone
  • Signal Transduction / drug effects
  • Thiazolidinediones / pharmacology
  • Vasoconstrictor Agents / pharmacology*
  • Vasodilator Agents / pharmacology

Substances

  • PPAR gamma
  • Receptor, Angiotensin, Type 1
  • Thiazolidinediones
  • Vasoconstrictor Agents
  • Vasodilator Agents
  • Rosiglitazone
  • Angiotensin II
  • Phosphatidylinositol 3-Kinases
  • Mitogen-Activated Protein Kinases