Kefir peptides alleviate particulate matter <4 μm (PM)-induced pulmonary inflammation by inhibiting the NF-κB pathway using luciferase transgenic mice.

Kefir peptides, generated by kefir grain fermentation of milk proteins, showed positive antioxidant effects, lowered blood pressure and modulated the immune response. In this study, kefir peptide was evaluated regarding their anti-inflammatory effects on particulate matter <4 μm (PM)-induced lung inflammation in NF-κB-luciferase transgenic mice. The lungs of mice under 20 mg/kg or 10 mg/kg PM treatments, both increased significantly the generation of reactive oxygen species (ROS) and inflammatory cytokines; increased the protein expression levels of p-NF-κB, NLRP3, caspase-1, IL-1β, TNF-α, IL-6, IL-4 and α-SMA.