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Title: Effect of treatment with cholecalciferol on the membrane potential and contractility of aortae from spontaneously hypertensive rats
Authors: Silva, Eneida de Gusmao [UNIFESP]
Fredianineto, E.
Ferreira, A. T.
Paiva, Antonio Cechelli de Mattos[UNIFESP]
Paiva, Therezinha Bandiera [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Keywords: cholecalciferol
spontaneously hypertensive rats
membrane potential
Issue Date: 1-Jul-1996
Publisher: Stockton Press
Citation: British Journal Of Pharmacology. Basingstoke: Stockton Press, v. 118, n. 6, p. 1367-1370, 1996.
Abstract: 1 The diet of spontaneously hypertensive rats (SHR) and normotensive Wistar rats (NWR) was supplemented with 12.5 mu g cholecalciferol per 100 g body weight daily, by gavage, for 4 weeks.2 The amplitude of the contractile responses of aortic rings from SHR to potassium and adrenaline, which was smaller than in NWR aortae, was increased after treatment with cholecalciferol. No further changes were observed in the responses of NWR and SHR aortae in the presence of 100 nM apamin.3 The membrane potentials of aortae from SHR, which were higher than those of aortae from NWR, decreased after treatment with cholecalciferol. Further depolarization was observed in aortic rings from NWR, but not in aortic rings from SHR, after their preincubation with 100 nM apamin.4 It is concluded that cholecalciferol normalizes the membrane potential and contractility of aortae from SHR, probably through an effect on lipid composition and structure of the plasma membrane.
ISSN: 0007-1188
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