Home General Physiology and Biophysics 2019 General Physiology and Biophysics Vol.38, No.3, p.227–235, 2019

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ISSN 1338-4325 (online)
ISSN 0231-5882 (print)
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General Physiology and Biophysics Vol.38, No.3, p.227–235, 2019

Title: Lipid emulsion attenuates the vasodilation induced by a toxic dose of a calcium channel blocker through its partitioning into the lipid phase
Author: Seong-Ho Ok, Soo Hee Lee, Hyun-Jin Kim, Jeong-Min Hong, Ji-Yoon Kim, Sung Il Bae, Yunsik Shin, Ju-Tae Sohn
Abstract: The present in vitro study examined whether lipid emulsion attenuates the vasodilation evoked by toxic doses of calcium channel blockers (bepridil, verapamil, nifedipine and diltiazem) via their partitioning into the lipid phase. The effects of the calcium channel blockers alone, the lipid emulsion and calcium channel blocker mixture, and the centrifuged aqueous extract (CAE) obtained from ultracentrifugation of the lipid emulsion and calcium channel blocker mixture on isolated endothelium-denuded rat aortas precontracted with phenylephrine were observed. The effects of lipid emulsion on calcium channel blocker concentration in the Krebs solution were examined using ultraperformance liquid chromatography. A mixture of lipid emulsion with either bepridil or verapamil and the corresponding CAE more effectively attenuated vasodilation than either bepridil or verapamil alone, whereas the vasodilation induced by the mixture of lipid emulsion and either bepridil or verapamil was not significantly different from that induced by the corresponding CAE. The magnitude of the lipid emulsion-mediated reduction in vasodilation and calcium channel blocker concentration was as follows: bepridil > verapamil > nifedipine or diltiazem. These results suggest that lipid emulsion attenuates vasodilation induced by a toxic dose of bepridil and verapamil, seemingly through partitioning of the calcium channel blocker into the lipid phase.
Keywords: Verapamil, Lipid emulsion, Vasodilation, Partitioning, Centrifuged aqueous extract
Published online: 06-Jun-2019
Year: 2019, Volume: 38, Issue: 3 Page From: 227, Page To: 235
doi:10.4149/gpb_2019008


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