Photobiomodulation Activated TGF-β1 Has Discrete Roles in Modulating Macrophage Responses to Bothrops jararacussu...

Bothrops jararacussu (BjsuV) snake bites cause severe local and systemic effects that are counteracted with antivenom that is ineffective in preventing damage to muscle tissue and amputations. Photobiomodulation (PBM) has emerged as a promising adjunct anti-inflammatory therapy. This study investigated whether PBM can modulate macrophage functions via TGF-β1 following exposure to BjsuV. Cell survival, migration, and phagocytosis of macrophages were evaluated after treatments with BjsuV, TGF-β1, a TGF-β inhibitor-SB431542, and PBM (660 nm red or 810 nm near-infrared laser at 10 mW/cm², 400 and 500 s, 4 J/cm², and 5 J/cm², 7.5 pJ/cm², 1.7ɇ). BjsuV-reduced macrophage survival and migration but increased phagocytosis that was significantly counteracted by PBM treatments. These observations suggest the anti-inflammatory effects of PBM in macrophages contribute to its therapeutic potential in mitigating venom-induced multiple signaling pathways. These mechanistic insights could improve the rigor and reproducibility of future clinical PBM anti-inflammatory treatments.