Platelet Membrane Biomimetic Magnetic Nanocarriers for Targeted Delivery and In Situ Generation of Nitric Oxide in Early Ischemic Stroke.

Early diagnosis and treatment of acute ischemic stroke poses a significant challenge due to its suddenness and short therapeutic time window. Human endogenous cells derived biomimetic drug carriers have provided new options for stroke theranostics since these cells have higher biosafety and targeting abilities than artificial carriers. Inspired by natural platelets (PLTs) and their role in targeting adhesion to the damaged blood vessel during thrombus formation, we fabricated a biomimetic nanocarrier comprising a PLT membrane envelope loaded with L-arginine and γ-Fe2O3 magnetic nanoparticles (PAMNs) for thrombus targeted delivery of L-arginine and in situ generation of nitric oxide (NO). Results demonstrate that the engineered 200 nm PAMNs inherit the natural properties of the PLT membrane and achieve rapid targeting to ischemic stroke lesions under the guide of an external magnetic field. Subsequent to the release of L-arginine at the thrombus site, endothelial cells produce NO that promotes vasodilation to disrupt the local PLT aggregation. Rapid targeting of PAMNs to stroke lesions as well as in situ generation of NO prompts vasodilation, recovery of blood flow, and reperfusion of the stroke microvascular. Thus, these PLT membrane derived nanocarriers are diagnostically beneficial for localizing stroke lesions, and a promising modality for executing therapies.