Transferrin receptor-mediated transport at the blood-brain barrier is elevated during early development and maintained across aging and in an Alzheimer’s mouse model

brain exposure compared to adult mice. Furthermore, vascular TfR in AD patient brains was similar to age-matched controls, suggesting conserved TfR transport is also likely in human AD. Overall, our data demonstrates broad functional utility for TfR-based brain delivery in both healthy aging and in an AD mouse model. Additionally, elevated TfR-mediated brain delivery during early mouse development highlights the potential of added efficacy in utilizing such platforms in disease treatment of infants and children.