Guiding Diffusion of Magnetic Nanoparticles from Nose to the Brain Using Permanent Magnet is Theoretically Feasible but Practically Challenging

The blood-brain barrier (BBB) presents a significant challenge in delivering medications to the brain, impeding direct targeting of specific brain regions in humans. Currently, effective methods for overcoming this protective barrier are limited. Targeted drug delivery to the brain from the nose has been utilized successfully, albeit the delivered dose of medication directly to the brain predominantly depends on circulation. One promising strategy involves guiding magnetic nanoparticles through the cribriform plate from the nose to the brain. Unlike other areas, the nose and circumventricular organs provide a less restrictive pathway where the BBB is permeable. The concept of guiding the diffusion of magnetic nanoparticles through the cribriform plate appears feasible in theory. However, the complexity of such a delivery system necessitates a heuristic approach for practical implementation. In our recent study, we attempted to guide the diffusion of fluorescent magnetic nanoparticles using neodymium magnets in different media and animal brain tissues. Although, we did not successfully demonstrate this method of delivery with simplistic approach, we argue that an interprofessional effort is essential to tackle this mode of drug delivery by passing the challenges posed by the BBB and to innovate targeted drug delivery solutions for the brain. By leveraging diverse perspectives and specialized knowledge, we can advance towards more effective therapies that harness the potential of magnetic nanoparticle technology for neurological treatments. Keywords: magnetic nanoparticles, targeted drug delivery, nasal drug delivery, bypass blood brain barrier, olfactory epithelium