| خلاصه مقاله | Background and Aim: Brain photobiomodulation (PBM) therapy modulates various biological and cognitive processes in senescence rodent models. This study was designed to investigate the effects of transcranial near-infrared (NIR) laser treatment on D-galactose (D-gal)/aluminum chloride (AlCl3) induced inflammation, synaptic dysfunction, and cognitive impairment in mice
Methods: The aged mouse model was induced by injecting D-gal subcutaneously (60 mg/kg/day) and intragastrically administering AlCl3 (200 mg/kg/day) for 2 months. NIR PBM (810 nm laser, 32, 16, and 8 J/cm2) was administered transcranially every other day (3 days/week) for 2 months. Social and spatial memories were assessed by the social interaction test and Lashley III maze, respectively. Then, tumor necrosis factor-α (TNF-α), interleukin (IL)-6, and synaptic markers including growth-associated protein 43 (GAP-43), post-synaptic density-95 (PSD-95), and synaptophysin (SYN) levels were measured in the hippocampus using western blot method.
Results: Behavioral results revealed that NIR PBM at fluencies of 16 and 8 J/cm2 could reduce D-gal/AlCl3 impaired social and spatial memories .Treatment with NIR attenuated neuroinflammation through down-regulation of TNF-α and IL-6. Additionally, NIR significantly inhibited the down-regulation of GAP-43 and SYN.
Conclusion: The results indicate that transcranial PBM at the fluencies 16 and 8 J/cm2 effectively prevents cognitive impairment in mice models of aging by inhibiting the production of inflammatory cytokines and enhancing synaptic markers. |