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

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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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Acknowledgements

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Authors and Affiliations

  1. Department of Physiological Sciences, Federal University of São Carlos, São Carlos, SP, Brazil

    Luis Henrique Oliveira de Moraes & Gerson Jhonatan Rodrigues

  2. Nucleus of Research and Teaching of Phototherapy in Health Sciences, NuPEn, São Carlos, SP, Brazil

    Marília Wellichan Mancini & Luciana Almeida-Lopes

Authors
  1. Luis Henrique Oliveira de Moraes
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  2. Marília Wellichan Mancini
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  3. Luciana Almeida-Lopes
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  4. Gerson Jhonatan Rodrigues
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Contributions

LM and GR: Conceptualization; LM and GR: Data curation; LM, MM, LL, and GR: Formal analysis; GR: Funding acquisition; LM: Investigation; GR: Methodology; GR: Project administration; LM: Resources; GR: Supervision; GR: Validation; GR: Visualization; LM: Roles/Writing—original draft; LM: Writing—review & editing

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Correspondence to Luis Henrique Oliveira de Moraes.

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Ethical approval

This study received a favorable opinion from the Animal Use Ethics Committee (CEUA) of the Federal University of São Carlos, under the Protocol number: 6382051216.

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The authors declare no competing interests.

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Highlights

Violet led induces vasorelaxation by nitric oxide–dependent sGC activation and non-dependent of endothelium and NOS activation. It is also able to increase SOD activity.

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de Moraes, L.H.O., Mancini, M.W., Almeida-Lopes, L. et al. Violet LED induces vasodilation in rat aortic rings by soluble guanylate cyclase–dependent mechanism and increases SOD activity. Lasers Med Sci 37, 537–544 (2022). https://doi.org/10.1007/s10103-021-03293-2

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  • DOI: https://doi.org/10.1007/s10103-021-03293-2

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