Low-level laser therapy stimulates the oxidative burst in human neutrophils and increases their fungicidal capacity

Cláudio Daniel Cerdeira, Maísa Ribeiro Pereira Lima Brigagão, Marina Lara Carli, Cláudia de Souza Ferreira, Gabriel de Oliveira Isac Moraes, Henrique Hadad, João Adolfo Costa Hanemann, Michael R. Hamblin, Felipe Fornias Sperandio

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Low-level laser therapy (LLLT) is known to enhance mitochondrial electron transfer and ATP production; thus, this study asked whether LLLT could stimulate the oxidative burst in human neutrophils (PMN) and improve their ability to kill microorganisms. Blood from healthy human subjects was collected and PMN were isolated from the samples. PMN were treated in vitro with 660 nm or 780 nm CW laser light at 40 mW power and increasing energies up to 19.2 J and were subsequently incubated with Candida albicans cells. Generation of hydroxyl radicals, hypochlorite anions and superoxide anions by PMN were checked using fluorescent probes and chemiluminescence assays; a microbicidal activity assay against C. albicans was also performed. LLLT excited PMN to a higher functional profile, which was translated as superior production of reactive oxygen species (ROS) and increased fungicidal capacity. The most efficacious energy was 19.2 J and, interestingly, the 660 nm light was even more efficacious than 780 nm at increasing the respiratory burst of PMN and the fungicidal capacity. (Figure presented.) Human neutrophils (PMN) were stimulated in vitro with 660 nm or 780 nm CW laser light at 40 mW of power and a total energy of 19.2 J. Low-level laser therapy (LLLT) excited PMN to a higher functional profile, which was translated as a superior production of reactive oxygen species (ROS) such as hydroxyl radicals (HO) and hypochlorite anions (ClO) (Figure) and increased fungicidal capacity against Candida albicans cells.

Original languageEnglish
Pages (from-to)1180-1188
Number of pages9
JournalJournal of Biophotonics
Volume9
Issue number11-12
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Keywords

  • Candida albicans
  • low-level laser therapy
  • neutrophils
  • oxidative burst
  • photobiomodulation
  • reactive oxygen species

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • General Biochemistry,Genetics and Molecular Biology
  • General Engineering
  • General Physics and Astronomy

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