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Published in: Lasers in Medical Science 1/2022

01-02-2022 | Original Article

Violet LED induces vasodilation in rat aortic rings by soluble guanylate cyclase–dependent mechanism and increases SOD activity

Authors: Luis Henrique Oliveira de Moraes, Marília Wellichan Mancini, Luciana Almeida-Lopes, Gerson Jhonatan Rodrigues

Published in: Lasers in Medical Science | Issue 1/2022

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Abstract

We found several studies that have used the aortic rings as an experimental model, mainly for the testing of new drugs or new therapies that try to reverse or prevent endothelial dysfunction or characterize its mechanism of action in a biological system, creating the knowledge necessary to obtain the treatment of those several diseases, where many of these treatments involve photobiomodulation therapies. We also found numerous wavelengths represented by different colors of LASER or LED in which frequently, the mechanism of action in biological systems is unknown. This study has as main objective to investigate the effects of the Violet LED Light (405 nm) by using isolated aortic rings, looking for nitric oxide (NO) release, and evaluating if Violet LED Light can modulate the superoxide dismutase (SOD) activity. We performed a vascular reactivity study in isolated aortic rings from normotensive rats with a single LED application. Besides it, the rings were pre-incubated with soluble guanylate cyclase (sGC) inhibitor or endothelial NO synthase inhibitor and subsequently underwent the application of the Violet LED. The cell viability and nitric oxide release in cell culture of human umbilical codon vein cells (HUVEC) were analyzed. In the vascular reactivity experiment, we observed a peak of vasodilation when applying light to the aortic rings. The soluble guanylate cyclase inhibitor abolished the relaxation induced by the Violet LED Light. However, the NO synthase inhibitor did not modify the Violet LED effect. In an isolated system, we verified that the Violet LED Light can increase SOD activity. Our results suggest that Violet LED Light induces vasodilation by a mechanism dependent on sGC activation, and not by NOS activation, and part of this effect could be due to the increase of SOD activity.
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Metadata
Title
Violet LED induces vasodilation in rat aortic rings by soluble guanylate cyclase–dependent mechanism and increases SOD activity
Authors
Luis Henrique Oliveira de Moraes
Marília Wellichan Mancini
Luciana Almeida-Lopes
Gerson Jhonatan Rodrigues
Publication date
01-02-2022
Publisher
Springer London
Published in
Lasers in Medical Science / Issue 1/2022
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI
https://doi.org/10.1007/s10103-021-03293-2

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