A Novel Facile and Efficient Prophylaxis Avenue of Chitosan Oligosaccharide/PLGA Based Polydatin Loaded Nanoparticles Against Bleomycin-Induced Lung Inflammation in Experimental Rat Model.

Lung inflammation is a hallmark of several respiratory diseases. Despite the great effectiveness of the synthetic antiinflammatory agents, they cause potential side effects. Polydatin (PD), a natural phytomedicine, has antioxidant and antiinflammatory effects. Its clinical applications are hindered due to poor aqueous solubility, low bioavailability, and rapid metabolism by first-pass effect. Herein, we report the development of a novel chitosan oligosaccharide-coated PD-loaded Poly dl-lactide-co-glycolide nanoparticles (COS-coated PD/PLGA NPs) against a bleomycin-induced pulmonary inflammation in a rat model. The NPs exhibited a small particle size of 188.57 ± 5.68 nm and a high zeta potential of + 18.13 ± 2.75 mV with spherical architecture and sustained release pattern of PD. In vivo studies in bleomycin-induced lung inflammation in a rat model revealed the superior prophylactic activity of COS-coated PD/PLGA NPs over the free drug (PD) as demonstrated by histopathological and immunohistochemical analyses, alongside biochemical assays evaluating oxidative stress biomarkers and inflammatory cytokine levels. Overall, the optimized COS-coated PD/PLGA NPs formulation offers a promising prophylactic platform against many respiratory diseases.