BACKGROUND: Insulin resistance, a frequent finding in hypertensive patients, leads to accelerated cardiovascular damage. It has been suggested that a crosstalk between angiotensin II and insulin signaling pathways may provoke insulin resistance, and may contribute to the development of cardiovascular damage. To identify a common pathophysiologic pathway between metabolic disorders and cardiovascular remodeling, we investigated the effect of angiotensin II and insulin on extracellular signal regulated kinases 1 and 2 (ERK1/2), isoforms of mitogen-activated protein kinases (MAPK) involved in cellular proliferation and extracellular matrix deposition. METHODS: Skin fibroblasts from normotensive subjects, insulin sensitive hypertensive subjects, and insulin resistant hypertensive subjects were cultured and used after four passages. The ERK1/2 expression and phosphorylation were measured by Western blot using specific antibodies, respectively anti-ERK1/2 and anti-pERK1/2. Expression of AT1 receptor for angiotensin II was determined by reverse transcriptase-polymerase chain reaction in real time. RESULTS: The ERK1/2 were similarly expressed in skin fibroblasts from all groups; ERK1/2 phosporylation evoked by angiotensin II was significantly higher in fibroblasts from hypertensive patients in comparison to normotensive subjects, but the increase was observed only in insulin resistant hypertensive subjects. The effect of insulin on ERK1/2 phosphorylation was not significantly different in the three groups. Treatment with the combination of insulin and angiotensin II increased ERK1/2 phosphorylation to a greater extent in comparison to the single agonists in normotensive subjects and in insulin sensitive but not in insulin resistant hypertensive subjects. CONCLUSIONS: Angiotensin II stimulated ERK1/2 activation is increased in insulin resistant hypertensive subjects, and it may play a role in the pathogenesis of insulin resistance and accelerated cardiovascular damage.
BACKGROUND:Insulin resistance, a frequent finding in hypertensivepatients, leads to accelerated cardiovascular damage. It has been suggested that a crosstalk between angiotensin II and insulin signaling pathways may provoke insulin resistance, and may contribute to the development of cardiovascular damage. To identify a common pathophysiologic pathway between metabolic disorders and cardiovascular remodeling, we investigated the effect of angiotensin II and insulin on extracellular signal regulated kinases 1 and 2 (ERK1/2), isoforms of mitogen-activated protein kinases (MAPK) involved in cellular proliferation and extracellular matrix deposition. METHODS: Skin fibroblasts from normotensive subjects, insulin sensitive hypertensive subjects, and insulin resistant hypertensive subjects were cultured and used after four passages. The ERK1/2 expression and phosphorylation were measured by Western blot using specific antibodies, respectively anti-ERK1/2 and anti-pERK1/2. Expression of AT1 receptor for angiotensin II was determined by reverse transcriptase-polymerase chain reaction in real time. RESULTS: The ERK1/2 were similarly expressed in skin fibroblasts from all groups; ERK1/2 phosporylation evoked by angiotensin II was significantly higher in fibroblasts from hypertensivepatients in comparison to normotensive subjects, but the increase was observed only in insulin resistant hypertensive subjects. The effect of insulin on ERK1/2 phosphorylation was not significantly different in the three groups. Treatment with the combination of insulin and angiotensin II increased ERK1/2 phosphorylation to a greater extent in comparison to the single agonists in normotensive subjects and in insulin sensitive but not in insulin resistant hypertensive subjects. CONCLUSIONS:Angiotensin II stimulated ERK1/2 activation is increased in insulin resistant hypertensive subjects, and it may play a role in the pathogenesis of insulin resistance and accelerated cardiovascular damage.
Authors: Orly Vardeny; Deepak K Gupta; Brian Claggett; Stuart Burke; Amil Shah; Laura Loehr; Laura Rasmussen-Torvik; Elizabeth Selvin; Patricia P Chang; David Aguilar; Scott D Solomon Journal: JACC Heart Fail Date: 2013-12 Impact factor: 12.035
Authors: Wilfried Dinh; Mark Lankisch; Werner Nickl; Daniel Scheyer; Thomas Scheffold; Frank Kramer; Thomas Krahn; Rolf M Klein; Michael Coll Barroso; Reiner Füth Journal: Cardiovasc Diabetol Date: 2010-10-15 Impact factor: 9.951
Authors: Angela Sciacqua; Sofia Miceli; Laura Greco; Franco Arturi; Paola Naccarato; Deborah Mazzaferro; Eliezer J Tassone; Laura Turano; Francesco Martino; Giorgio Sesti; Francesco Perticone Journal: Diabetes Care Date: 2011-09-12 Impact factor: 19.112