In Vitro Evidence of Tissue Susceptibility Rhythms. I. Temporal Variation in Effect of Potassium Chloride and Phenylephrine on Rat Aorta

In this study, time-dependent variations in the in vitro sensitivity of rat thoracic aorta rings to potassium chloride (KC1) and phenylephrine (Phe) were investigated. Animals were synchronized with a 12h light and 12h darkness (lights on 08:00-20:00) schedule, and thoracic aortas were obtained at s...

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Veröffentlicht in:Chronobiology international 1998, Vol.15 (1), p.39-48
Hauptverfasser: Görgün, Cem Z., Keskil, Zuhal Aktuna, Hodoglugil, UgUr, Ercan, Z. Sevim, Abaciog'lu, Nurettin, Zengil, Hakan
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container_end_page 48
container_issue 1
container_start_page 39
container_title Chronobiology international
container_volume 15
creator Görgün, Cem Z.
Keskil, Zuhal Aktuna
Hodoglugil, UgUr
Ercan, Z. Sevim
Abaciog'lu, Nurettin
Zengil, Hakan
description In this study, time-dependent variations in the in vitro sensitivity of rat thoracic aorta rings to potassium chloride (KC1) and phenylephrine (Phe) were investigated. Animals were synchronized with a 12h light and 12h darkness (lights on 08:00-20:00) schedule, and thoracic aortas were obtained at six different times of the day (1, 5, 9, 13, 17, and 21 hours after lights on). In order to avoid endothelial influence, all experiments were performed in endothelium-denuded preparations. Responses to KC1 showed time-dependent variations in all the concentrations used. Phe-induced contractions also exhibited time-dependent differences. The rhythmic pattern of Phe responses did not change with the presence of the ar adrenergic antagonist prazosin. In addition, both the ECio values of KC1 and Phe, and also the ATB values of prazosin, displayed rhythmicity. In conclusion, time of obtaining tissues is an important factor for experimental standardization in, at least, vascular smooth muscle preparations. (Chornobio Interna-tional, 15(1)39-48, 1998)
doi_str_mv 10.3109/07420529808998668
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Responses to KC1 showed time-dependent variations in all the concentrations used. Phe-induced contractions also exhibited time-dependent differences. The rhythmic pattern of Phe responses did not change with the presence of the ar adrenergic antagonist prazosin. In addition, both the ECio values of KC1 and Phe, and also the ATB values of prazosin, displayed rhythmicity. In conclusion, time of obtaining tissues is an important factor for experimental standardization in, at least, vascular smooth muscle preparations. 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source MEDLINE; Taylor & Francis:Master (3349 titles)
subjects Activity Cycles - drug effects
Activity Cycles - physiology
Animals
Aorta, Thoracic - drug effects
Aorta, Thoracic - physiology
Biological and medical sciences
Blood vessels and receptors
Fundamental and applied biological sciences. Psychology
Male
Muscle Contraction - drug effects
Phenylephrine - antagonists & inhibitors
Phenylephrine - pharmacology
Potassium Chloride - pharmacology
Prazosin - pharmacology
Rat aorta
Rats
Rats, Wistar
Ultradian rhythm
Vasoactive agents
Vasoconstrictor Agents - pharmacology
Vertebrates: cardiovascular system
title In Vitro Evidence of Tissue Susceptibility Rhythms. I. Temporal Variation in Effect of Potassium Chloride and Phenylephrine on Rat Aorta
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