Endothelial Function and Vascular Oxidative Stress in Long-lived GH/IGF-deficient Ames Dwarf Mice

Overview

Journal Am J Physiol Heart Circ Physiol

Publisher American Physiological Society

Specialties Cardiology & Vascular Diseases
Physiology

Date 2008 Sep 2

PMID 18757483

Citations 98

Authors

Anna Csiszar

Nazar Labinskyy

Viviana Perez

Fabio A Recchia

Andrej Podlutsky

Partha Mukhopadhyay

Gyorgy Losonczy

Pal Pacher

Steven N Austad

Andrzej Bartke

Zoltan Ungvari

Affiliations

Soon will be listed here.

Abstract

Hypopituitary Ames dwarf mice have low circulating growth hormone (GH)/IGF-I levels, and they have extended longevity and exhibit many symptoms of delayed aging. To elucidate the vascular consequences of Ames dwarfism we compared endothelial O2(-) and H2O2 production, mitochondrial reactive oxygen species (ROS) generation, expression of antioxidant enzymes, and nitric oxide (NO) production in aortas of Ames dwarf and wild-type control mice. In Ames dwarf aortas endothelial O2(-) and H2O2 production and ROS generation by mitochondria were enhanced compared with those in vessels of wild-type mice. In Ames dwarf aortas there was a less abundant expression of Mn-SOD, Cu,Zn-SOD, glutathione peroxidase (GPx)-1, and endothelial nitric oxide synthase (eNOS). NO production and acetylcholine-induced relaxation were also decreased in aortas of Ames dwarf mice. In cultured wild-type mouse aortas and in human coronary arterial endothelial cells treatment with GH and IGF significantly reduced cellular O2(-) and H2O2 production and ROS generation by mitochondria and upregulated expression of Mn-SOD, Cu,Zn-SOD, GPx-1, and eNOS. Thus GH and IGF-I promote antioxidant phenotypic changes in the endothelial cells, whereas Ames dwarfism leads to vascular oxidative stress.

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