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Research Article Free access | 10.1172/JCI117605

Gadolinium inhibits mechanoelectrical transduction in rabbit carotid baroreceptors. Implication of stretch-activated channels.

G Hajduczok, M W Chapleau, R J Ferlic, H Z Mao, and F M Abboud

Cardiovascular Center, University of Iowa College of Medicine, Iowa City 52242.

Find articles by Hajduczok, G. in: PubMed | Google Scholar

Cardiovascular Center, University of Iowa College of Medicine, Iowa City 52242.

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Cardiovascular Center, University of Iowa College of Medicine, Iowa City 52242.

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Cardiovascular Center, University of Iowa College of Medicine, Iowa City 52242.

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Cardiovascular Center, University of Iowa College of Medicine, Iowa City 52242.

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Published December 1, 1994 - More info

Published in Volume 94, Issue 6 on December 1, 1994
J Clin Invest. 1994;94(6):2392–2396. https://doi.org/10.1172/JCI117605.
© 1994 The American Society for Clinical Investigation
Published December 1, 1994 - Version history
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Abstract

Gadolinium (Gd3+) has been shown to prevent mechanoelectrical transduction believed to be mediated through stretch-activated channels. We investigated the possible role of Gd(3+)-sensitive channels in mediating baroreceptor activity in the carotid sinus of rabbits. Baroreceptor activity induced by a ramp increase of carotid sinus pressure was reduced significantly during exposure to Gd3+. The inhibition was dose-related and reversible, and was not associated with alteration of carotid sinus wall mechanics as the pressure-strain relationship was unaffected. Veratrine triggered action potentials from single- and multiple-baroreceptor fibers when their response to pressure was inhibited by Gd3+. This suggests that the effect of Gd3+ on baroreceptors in the isolated carotid sinus was specific to their mechanical activation. The results suggest that stretch-activated ion channels sensitive to Gd3+ may be the mechanoelectrical transducers of rabbit carotid sinus baroreceptors.

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