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Bratislava Medical Journal 2013 Bratislava Medical Journal Vol.114, No.10, p.553-555, 2013
Bratislava Medical Journal 2013 Bratislava Medical Journal Vol.114, No.10, p.553-555, 2013
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Bratislava Medical Journal Vol.114, No.10, p.553-555, 2013 |
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| Title: Vascular reactivity of arteria femoralis in adult and aged spontaneously hypertensive and Wistar-Kyoto rats | ||
| Author: M. Petrova, S. Liskova, R. Vojtko, R. Villaris, Z. Varga, J. Zicha, V. Kristova | ||
| Abstract: Aim: The relationship of age and hypertension on endothelial dysfunction and increased responses to vasoconstrictor stimuli. Background: Hypertension is a disease accompanied by endothelial dysfunction and is characterized by an impaired vascular reactivity and enhanced activity of sympathetic nervous system. Materials and methods: In our experiment, we used spontaneously hypertensive rats representing model of essential hypertension and the Wistar-Kyoto rats as normotensive strain. Femoral arteries of adult and aged rats were put into the chamber of Mulvany-Halpern isometric myograph. As the nutrient solution, the modified Krebs-Henseleit solution having temperature 37 °C and bubbled with O2 was used. After 30 minutes stabilization of blood vessels, a dose-dependent curve of norepinephrine response was recorded (concentrations 3x10-8 M, 10-7 M, 3x10-7 M, 10-6 M, 3x10-6 M, 10-5 M, 3x10-5 M, 10-4 M), followed by a dose-dependent curve of acetylcholine response (concentrations 3x10-8 M, 10-7 M, 3x10-7 M, 10-6 M, 3x10-6 M). Results: Our experiments recorded an increased reactivity to contraction stimuli in spontaneously hypertensive animals. Vascular reactivity to norepinephrine at 5 month and 12 month old rats from the same group was not significantly affected. Our experiments on the other hand, did not record a reduced endothelium-dependent relaxation in hypertensive compared to normotensive animals, neither in different age groups. Conclusions: Increased norepinephrine-induced contraction occurs even before development of reduced acetylcholine-induced relaxation in SHR rats. We predict that in our experiment hypertension plays a bigger role in the development of endothelial dysfunction than aging (Fig. 2, Ref. 22). |
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| Keywords: spontaneously hypertensive rats, Wistar-Kyoto rats, acetylcholine, norepinephrine | ||
| Year: 2013, Volume: 114, Issue: 10 | Page From: 553, Page To: 555 | |
| doi:10.4149/BLL_2013_116 |
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