Author:
Racz K,Kuchel O,Buu N T,Tenneson S
Abstract
We have studied several parameters of peripheral dopamine synthesis and metabolism in spontaneously hypertensive rats during the development of hypertension. Compared to Wistar-Kyoto rats, there was an increased dopamine content in 8-week-old spontaneously hypertensive rats in the adrenals (1.6 +/- 0.1 vs. 1.2 +/- 0.1 nmol/pair in Wistar-Kyoto rats) and kidneys (97 +/- 12 vs. 63 +/- 7 pmol/g tissue in Wistar-Kyoto rats), but the dopamine content in peripheral organs from normotensive 4-week-old spontaneously hypertensive rats did not differ from Wistar-Kyoto rats. In the heart, the dopamine increase was observed in 14-week-old spontaneously hypertensive rats (systolic blood pressure: spontaneously hypertensive rats, 189 +/- 9; Wistar-Kyoto rats, 106 +/- 2 mm Hg;) in both atrium (spontaneously hypertensive rats, 133 +/- 14; Wistar-Kyoto rats, 86 +/- 20 pmol/g tissue) and ventricle (spontaneously hypertensive rats, 41 +/- 6; Wistar-Kyoto rats, 23 +/- 5 pmol/g tissue). Urinary free dopamine and dihydroxyphenylacetic acid, but not norepinephrine or normetanephrine, in spontaneously hypertensive rats significantly increased between the ages of 7 and 11 weeks, reflecting the dopamine changes in tissue and suggesting a selective increase of the rate of dopamine synthesis and release.(ABSTRACT TRUNCATED AT 250 WORDS)
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Cardiology and Cardiovascular Medicine,Physiology
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