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Hypertension. 2004 May;43(5):1011-6. Epub 2004 Mar 8.

Hypertension and insulin resistance are not directly related in obese dogs.

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  • 1Division of Pediatric Cardiology, University of Michigan, Ann Arbor, USA. rocchini@umich.edu

Abstract

In dogs fed a high-fat diet, we determined whether there was a direct relation between obesity-induced insulin resistance and obesity-induced hypertension. Thirty-six adult mongrel dogs were chronically instrumented and assigned to receive either a high-fat diet alone (n=7) or a high-fat diet combined with a low-sodium diet plus furosemide (n=6), prazosin plus atenolol (n=7), clonidine (n=10), or aspirin (n=6). Blood pressure, heart rate, and body weight were measured daily. Insulin resistance was assessed with a single-dose euglycemic hyperinsulinemic clamp (2 mU x kg(-1) x min(-1)) before and after 1, 3, and 6 weeks of the high-fat diet. The low-salt diet plus furosemide, prazosin plus atenolol, and clonidine treatments prevented the hypertension associated with feeding the dogs a high-fat diet. Only clonidine treatment totally prevented the development of insulin resistance, and high-dose aspirin, known to prevent insulin resistance by inhibition of the activity of IkappaB kinase-beta, decreased the degree of insulin resistance by almost 70%. However, aspirin had no effect on the development of hypertension. We conclude that obesity-induced hypertension and obesity-induced insulin resistance are not directly related. In addition, there is a suggestion that insulin resistance in this experimental model is mediated through the central and or peripheral alpha2-adrenoceptors, whereas hypertension is mediated through the alpha1- and or beta-adrenoceptors.

PMID:
15007033
[PubMed - indexed for MEDLINE]
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