title: Effect of low power 655 nm diode laser irradiation on the neuromuscular junctions of the mouse diaphragm.
abstract: OBJECTIVE
  Low level laser therapy (LLLT) in specific wavelengths and fluence maintains the electrophysiological activity of injured peripheral nerve in rats, preventing scar formation (at injury site) as well as degenerative changes in the corresponding motor neurons of the spinal cord, thus accelerating regeneration of the injured nerve. We studied the effect of LLLT on the neurotransmitter release in neuromuscular junctions of the mouse diaphragm.
  
  
  METHODS
  Thirty-nine diaphragm muscles were studied. LLLT with GaAlAs 655 nm (1-12 J/cm(2)) was used. Neurotransmitter release was studied by conventional intracellular recording techniques on curarised or high magnesium media. Quantal content, amplitude, latency and rise time were analysed for end-plate potentials (EPPs). Frequency and amplitude were evaluated for the miniature end-plate potentials (MEPPs). Short-term plasticity of the neurotransmitter release (fast facilitation) was also evaluated by paired pulse stimulation.
  
  
  CONCLUSIONS
  This study showed that LLLT (655 nm) in these doses has no detectable physiological effect on the motor end-plate neurotransmitter release in mice.
authors.affiliation: Institute for Research and Development, Universidade do Vale do Paralba (Univap)-SJC, Brazil. renatanicolau@hotmail.com
authors.forename: Renata Amadei
authors.initials: RA
authors.lastname: Nicolau
authors.forename: Manel Santafé
authors.initials: MS
authors.lastname: Martinez
authors.forename: Josepa
authors.initials: J
authors.lastname: Rigau
authors.forename: Josep
authors.initials: J
authors.lastname: Tomàs
mesh_terms: D000818:Animals; D003964:Diaphragm / Q000294:innervation / Q000378:metabolism; D004594:Electrophysiology; D028022:Low-Level Light Therapy; D008297:Male; D051379:Mice; D009045:Motor Endplate / Q000378:metabolism / Q000502:physiology; D009469:Neuromuscular Junction / Q000502:physiology / Q000528:radiation effects*; D018377:Neurotransmitter Agents / Q000378:metabolism
chemical_list: D018377:Neurotransmitter Agents