Photobiomodulation therapy mitigates depressive-like behaviors by remodeling synaptic links and mitochondrial...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Psychiatry

Background:

• Depression is a major public health concern with complex underlying mechanisms.
• Photobiomodulation (PBM) shows therapeutic potential for depression, but its cellular effects are not fully understood.
• The chronic unpredictable mild stress (CUMS) model is widely used to study depression-like behaviors in rodents.

Purpose of the Study:

• To investigate the effects of 468 nm Photobiomodulation (PBM) on depression-like behavior and neuronal damage in a CUMS mouse model.
• To explore the molecular and cellular mechanisms underlying PBM's efficacy in treating depression.
• To assess PBM's impact on neuroinflammation, apoptosis, and synaptic function in the hippocampus.

Main Methods:

• Utilized the chronic unpredictable mild stress (CUMS) murine model to induce depression-like phenotypes.
• Administered Photobiomodulation (PBM) with 468 nm light to CUMS mice.
• Conducted in vitro experiments on corticosterone-induced hippocampal neuron injury models.
• Assessed behavioral deficits, neuroinflammation, apoptosis, oxidative stress, mitochondrial function, and brain-derived neurotrophic factor (BDNF) signaling pathways.

Main Results:

• PBM treatment significantly ameliorated depression-like behaviors in CUMS mice.
• PBM inhibited neuroinflammation and apoptosis in the hippocampus.
• PBM rejuvenated hippocampal synaptic function, potentially via up-regulation of BDNF signaling pathways.
• In vitro studies showed PBM reduced oxidative stress and improved mitochondrial function in injured hippocampal neurons.

Conclusions:

• Photobiomodulation (PBM) with 468 nm light is a promising non-invasive treatment for depression.
• PBM exerts its therapeutic effects by mitigating neuroinflammation, apoptosis, and oxidative stress, while enhancing synaptic function and mitochondrial health.
• The findings provide insights into the biological mechanisms of PBM for depression and suggest its potential for clinical application.