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Serial Changes in Norepinephrine Kinetics Associated With Feeding Dogs a High-Fat Diet
Authors
Albert P. Rocchini
Marla J. Smith
Mark A. Supiano
John Q. Yang
Publication date
16 December 2009
Publisher
'Wiley'
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PubMed
Abstract
J Clin Hypertens (Greenwich). 2010;12:117–124. © 2009 Wiley Periodicals, Inc. The role of increased sympathetic nervous system (SNS) activity in the pathogenesis of obesity hypertension and insulin resistance is controversial. Eight dogs were instrumented and fed a high-fat diet (HFD) for 6 weeks. Dogs were evaluated for changes in weight, blood pressure, insulin resistance, and norepinephrine (NE) kinetics using a two-compartment model. The HFD resulted in weight gain, hypertension, and insulin resistance. During the 6 weeks of the HFD, although plasma NE concentration trended toward increasing ( P =.09), SNS, assessed by NE kinetic studies, significantly increased ( P =.009). Within 1 week of starting the HFD, NE release into the extravascular compartment (NE 2 ) increased from 3.44±0.59 μg/mL to 4.87±0.80 μg/mL ( P <.01) and this increase was maintained over the next 5 weeks of the HFD (NE 2 at week 6 was 4.66±0.97 μg/mL). In addition to the increased NE 2 there was also a significant increase in NE clearance ( P =.04). There were significant correlations between the increase in NE 2 and both the development of insulin resistance and hypertension. This study supports the hypothesis that activation of the SNS plays a pivotal role in the metabolic and hemodynamic changes that occur with weight gain induced by HFD.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/78633/1/j.1751-7176.2009.00230.x.pd
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