Ginsenoside Rg3-encapsulated pegylated niosomes exhibit multimodal therapeutic potential in Alzheimer's disease

Ginsenoside Rg3 (GRg3), a bioactive compound extracted from ginseng, has demonstrated the ability to inhibit Aβ production and deposition. In this study, PEGylated GRg3-loaded niosomes were developed and characterized for potential AD treatment. Their efficacy was assessed using in vitro and in vivo models, as well as molecular dynamics simulations of self-assembly. Our formulation achieved a relatively high encapsulation efficiency of 83.02% and a controlled release profile, with 75.73% of the drug released over 48 h. In vitro, co-administration of Aβ with free or PEGylated GRg3-loaded niosomes markedly reduced the levels of Total Antioxidant Capacity, Malondialdehyde (MDA), and caspase-3 gene expression compared to the Aβ-only group. In vivo evaluations revealed that treatment with the niosomal formulation did not significantly alter behavioral parameters, MDA levels, or Superoxide Dismutase activity. However, catalase activity was significantly higher than in the control group. Histopathological and immunohistochemical analyses showed reduced neurovascular damage and preservation of blood-brain barrier (BBB) and hippocampal integrity in the treated group. MD simulations confirmed the spontaneous self-assembly of surfactant molecules into a bilayer structure with successful incorporation of GRg3. Our findings underscore the potential of PEGylated niosomes as efficient nanocarriers for GRg3 delivery in the AD treatment.