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Lasers in Medical Science

, Volume 31, Issue 9, pp 1855–1862 | Cite as

Increase in the nitric oxide release without changes in cell viability of macrophages after laser therapy with 660 and 808 nm lasers

  • Igor Henrique Morais SilvaEmail author
  • Samantha Cardoso de Andrade
  • Andreza Barkokebas Santos de Faria
  • Deborah Daniela Diniz Fonsêca
  • Luiz Alcino Monteiro Gueiros
  • Alessandra Albuquerque Tavares Carvalho
  • Wylla Tatiana Ferreira da Silva
  • Raul Manhães de Castro
  • Jair Carneiro Leão
Original Article

Abstract

The aim of this study was to evaluate the influence of low-level laser therapy (LLLT) with different parameters and wavelengths on nitric oxide (NO) release and cell viability. Irradiation was performed with Ga-Al-As laser, continuous mode and wavelengths of 660 and 808 nm at different energy and power densities. For each wavelength, powers of 30, 50, and 100 mW and times of 10, 30, and 60 s were used. NO release was measured using Griess reaction, and cell viability was evaluated by mitochondrial reduction of bromide 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) to formazan. LLLT promoted statistically significant changes in NO release and MTT value only at the wavelength of 660 nm (p < 0.05). LLLT also promoted an increase in the NO release and cell viability when the energy densities 64 (p = 0.04) and 214 J/cm2 (p = 0.012), respectively, were used. LLLT has a significant impact on NO release without affecting cell viability, but the significance of these findings in the inflammatory response needs to be further studied.

Keywords

Inflammation Laser therapy Macrophages MTT Nitric oxide NO 

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag London 2016

Authors and Affiliations

  • Igor Henrique Morais Silva
    • 1
    Email author
  • Samantha Cardoso de Andrade
    • 1
  • Andreza Barkokebas Santos de Faria
    • 1
  • Deborah Daniela Diniz Fonsêca
    • 1
  • Luiz Alcino Monteiro Gueiros
    • 1
  • Alessandra Albuquerque Tavares Carvalho
    • 1
  • Wylla Tatiana Ferreira da Silva
    • 2
  • Raul Manhães de Castro
    • 2
  • Jair Carneiro Leão
    • 1
  1. 1.Department of Clinic and Preventive DentistryPernambuco Federal UniversityRecifeBrazil
  2. 2.Department of NutritionPernambuco Federal UniversityRecifeBrazil

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