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Liver-derived insulin-like growth factor-I is involved in the regulation of blood pressure in mice.

Journal article
Authors Åsa Tivesten
Entela Bollano
Irene Andersson
Sharyn M. Fitzgerald
Kenneth Caidahl
Klara Sjögren
Ole Skøtt
Jun-Li Liu
Reza Mobini
Olle Isaksson
John-Olov Jansson
Claes Ohlsson
Göran Bergström
Jörgen Isgaard
Published in Endocrinology
Volume 143
Issue 11
Pages 4235-42
ISSN 0013-7227
Publication year 2002
Published at Wallenberg Laboratory
Cardiovascular Institute
Institute of Internal Medicine, Dept of Medicine
Institute of Internal Medicine
Institute of Physiology and Pharmacology, Dept of Physiology
Pages 4235-42
Language en
Links www.ncbi.nlm.nih.gov/entrez/query.f...
Keywords Acetylcholine, pharmacology, Animals, Blood Pressure, physiology, Body Weight, Cardiac Output, Creatinine, blood, urine, Echocardiography, Endothelin-1, genetics, Insulin-Like Growth Factor I, deficiency, genetics, physiology, Liver, chemistry, Mesenteric Arteries, drug effects, Mice, Mice, Inbred C57BL, Mice, Inbred CBA, Mice, Knockout, Myocardium, chemistry, Nitric Oxide Synthase, antagonists & inhibitors, genetics, Nitric Oxide Synthase Type II, Nitric Oxide Synthase Type III, Norepinephrine, analysis, Organ Size, RNA, Messenger, analysis, Renin, blood, Vasodilation, drug effects
Subject categories Medical and Health Sciences

Abstract

IGF-I has been suggested to be of importance for cardiovascular structure and function, but the relative role of locally produced and liver-derived endocrine IGF-I remains unclear. Using the Cre-LoxP recombination system, we have previously created transgenic mice with a liver-specific, inducible IGF-I knockout (LI-IGF-I-/-). To examine the role of liver-derived IGF-I in cardiovascular physiology, liver-derived IGF-I was inactivated at 4 wk of age, resulting in a 79% reduction of serum IGF-I levels. At 4 months of age, systolic blood pressure (BP) was increased in LI-IGF-I-/- mice. Echocardiography showed increased posterior wall thickness in combination with decreased stroke volume and cardiac output, whereas other systolic variables were unchanged, suggesting that these cardiac effects were secondary to increased peripheral resistance. Acute nitric oxide-synthase inhibition increased systolic BP more in LI-IGF-I-/- mice than in control mice. LI-IGF-I-/- mice showed impaired acetylcholine-induced vasorelaxation in mesenteric resistance vessels and increased levels of endothelin-1 mRNA in aorta. Thus, the increased peripheral resistance in LI-IGF-I-/- mice might be attributable to endothelial dysfunction associated with increased expression of endothelin-1 and impaired vasorelaxation of resistance vessels. In conclusion, our findings suggest that liver-derived IGF-I is involved in the regulation of BP in mice.

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