Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.

<h4>Objective</h4>Betahistine is a histamine H(1)-receptor agonist and H(3)-receptor antagonist that is administered to treat Menière's disease. Despite widespread use, its pharmacological mode of action has not been entirely elucidated. This study investigated the effect of betahis...

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Autores principales:	Fritz Ihler, Mattis Bertlich, Kariem Sharaf, Sebastian Strieth, Michael Strupp, Martin Canis
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a60723b3a12e4f37b472a1ee81d11a66
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spelling	oai:doaj.org-article:a60723b3a12e4f37b472a1ee81d11a662021-11-18T07:14:52ZBetahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.1932-620310.1371/journal.pone.0039086https://doaj.org/article/a60723b3a12e4f37b472a1ee81d11a662012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22745706/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Objective</h4>Betahistine is a histamine H(1)-receptor agonist and H(3)-receptor antagonist that is administered to treat Menière's disease. Despite widespread use, its pharmacological mode of action has not been entirely elucidated. This study investigated the effect of betahistine on guinea pigs at dosages corresponding to clinically used doses for cochlear microcirculation.<h4>Methods</h4>Thirty healthy Dunkin-Hartley guinea pigs were randomly assigned to five groups to receive betahistine dihydrochloride in a dose of 1,000 mg/kg b. w. (milligram per kilogram body weight), 0.100 mg/kg b. w., 0.010 mg/kg b. w., 0.001 mg/kg b. w. in NaCl 0.9% or NaCl 0.9% alone as placebo. Cochlear blood flow and mean arterial pressure were continuously monitored by intravital fluorescence microscopy and invasive blood pressure measurements 3 minutes before and 15 minutes after administration of betahistine.<h4>Results</h4>When betahistine was administered in a dose of 1.000 mg/kg b. w. cochlear blood flow was increased to a peak value of 1.340 arbitrary units (SD: 0.246; range: 0.933-1.546 arb. units) compared to baseline (p<0.05; Two Way Repeated Measures ANOVA/Bonferroni t-test). The lowest dosage of 0.001 mg/kg b. w. betahistine or NaCl 0.9% had the same effect as placebo. Nonlinear regression revealed that there was a sigmoid correlation between increase in blood flow and dosages.<h4>Conclusions</h4>Betahistine has a dose-dependent effect on the increase of blood flow in cochlear capillaries. The effects of the dosage range of betahistine on cochlear microcirculation corresponded well to clinically used single dosages to treat Menière's disease. Our data suggest that the improved effects of higher doses of betahistine in the treatment of Menière's disease might be due to a corresponding increase of cochlear blood flow.Fritz IhlerMattis BertlichKariem SharafSebastian StriethMichael StruppMartin CanisPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 6, p e39086 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fritz Ihler Mattis Bertlich Kariem Sharaf Sebastian Strieth Michael Strupp Martin Canis Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.
description	<h4>Objective</h4>Betahistine is a histamine H(1)-receptor agonist and H(3)-receptor antagonist that is administered to treat Menière's disease. Despite widespread use, its pharmacological mode of action has not been entirely elucidated. This study investigated the effect of betahistine on guinea pigs at dosages corresponding to clinically used doses for cochlear microcirculation.<h4>Methods</h4>Thirty healthy Dunkin-Hartley guinea pigs were randomly assigned to five groups to receive betahistine dihydrochloride in a dose of 1,000 mg/kg b. w. (milligram per kilogram body weight), 0.100 mg/kg b. w., 0.010 mg/kg b. w., 0.001 mg/kg b. w. in NaCl 0.9% or NaCl 0.9% alone as placebo. Cochlear blood flow and mean arterial pressure were continuously monitored by intravital fluorescence microscopy and invasive blood pressure measurements 3 minutes before and 15 minutes after administration of betahistine.<h4>Results</h4>When betahistine was administered in a dose of 1.000 mg/kg b. w. cochlear blood flow was increased to a peak value of 1.340 arbitrary units (SD: 0.246; range: 0.933-1.546 arb. units) compared to baseline (p<0.05; Two Way Repeated Measures ANOVA/Bonferroni t-test). The lowest dosage of 0.001 mg/kg b. w. betahistine or NaCl 0.9% had the same effect as placebo. Nonlinear regression revealed that there was a sigmoid correlation between increase in blood flow and dosages.<h4>Conclusions</h4>Betahistine has a dose-dependent effect on the increase of blood flow in cochlear capillaries. The effects of the dosage range of betahistine on cochlear microcirculation corresponded well to clinically used single dosages to treat Menière's disease. Our data suggest that the improved effects of higher doses of betahistine in the treatment of Menière's disease might be due to a corresponding increase of cochlear blood flow.
format	article
author	Fritz Ihler Mattis Bertlich Kariem Sharaf Sebastian Strieth Michael Strupp Martin Canis
author_facet	Fritz Ihler Mattis Bertlich Kariem Sharaf Sebastian Strieth Michael Strupp Martin Canis
author_sort	Fritz Ihler
title	Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.
title_short	Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.
title_full	Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.
title_fullStr	Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.
title_full_unstemmed	Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.
title_sort	betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/a60723b3a12e4f37b472a1ee81d11a66
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Betahistine exerts a dose-dependent effect on cochlear stria vascularis blood flow in guinea pigs in vivo.

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