Comparison of the metabolic changes in rats with hypertension secondary to fructose feeding or renal artery stenosis.
Hypertension was induced in rats by either renal artery stenosis or a fructose-enriched diet, and the consequent changes in plasma glucose, insulin, and triglyceride (TG) concentrations, and the steady-state plasma insulin (SSPI) and glucose (SSPG) concentrations in response to a 180-min continuous infusion of glucose and insulin in these two groups of hypertensive rats, were compared to values in a sham-operated group with normal blood pressure. Mean (+/- SEM) blood pressure was significantly higher than the control values (121 +/- 3 mm Hg) at the end of the study in rats with renal artery stenosis (178 +/- 13 mm Hg) and fructose-fed rats (151 +/- 5 mm Hg), whereas left ventricular weight was only significantly (P < .01) higher in rats with renal artery stenosis. Plasma glucose concentration was the same in all three groups, but fructose-fed rats had significantly higher plasma insulin (59 +/- 7 microU/mL) and TG (317 +/- 48 mg/dL) concentration than either sham-operated rats (30 +/- 4 microU/mL and 121 mg/dL) or rats with renal artery stenosis (34 +/- 5 microU/mL and 124 +/- 14 mg/dL). Although SSPI concentrations were similar (approximately 250 microU/mL) in all three groups of rats, SSPG concentrations were significantly higher (P < .01) in the fructose-fed rats (187 +/- 10 mg/dL) than in either sham-operated normotensive rats (120 +/- 6 mg/dL) or hypertensive rats with renal artery stenosis (133 +/- 4 mg/dL). Thus, insulin resistance, hyperinsulinemia, and hypertriglyceridemia developed in rats with fructose-induced hypertension, whereas none of these changes were seen in rats with renal artery stenosis.
Dall'Aglio
E
E
Institute of General Clinical Medicine, Parma University, Italy.
Tosini
P
P
Zavaroni
I
I
Olivetti
G
G
Reaven
G M
GM
D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D004032:Diet; D004195:Disease Models, Animal; D005632:Fructose; D006973:Hypertension / Q000209:etiology* / Q000378:metabolism*; D007328:Insulin / Q000097:blood; D008297:Male; D009929:Organ Size; D051381:Rats; D017207:Rats, Sprague-Dawley; D012078:Renal Artery Obstruction; D014280:Triglycerides / Q000097:blood
D001786:Blood Glucose; D007328:Insulin; D014280:Triglycerides; D005632:Fructose