Magnetic Nanobubble Mechanical Stress Induces the Piezo1 ‐Ca2+‐BMP2/Smad Pathway to Modulate Neural Stem Cell Fate and MRI/Ultrasound Dual Imaging Surveillance for Ischemic Stroke

Magnetic nanobubbles (MNBs) assembled from magnetic nanoparticles are fabricated. When interacting with neural stem cells (NSCs), these MNB nanostructures can contract and expand with volumetric oscillation, leading to a change in intramembrane mechanical properties. Therefore, MNBs can serve as acoustic sensors to transduce Piezo1-Ca2+- triggered BMP2/Smad signals regulating NSC development and can be tracked using magnetic resonance and ultrasound dual imaging. AbstractNeural stem cells (NSCs) are used to treat various nervous system diseases because of their self-renewal ability and multidirectional differentiation potential. However, an insufficient ability to track their migration in vivo and poor control over their survival and differentiation efficiency are two major critical challenges for clinical application. Here, it is shown that when magnetic nanobubbles (MNBs), which are assembled from magnetic nanoparticles, are internalized by NSCs, intramembrane volumetric oscillation of the MNBs induces an increase in intracellular hydrostatic pressure and cytoskeleton force, resulting in the activation of the Piezo1-Ca2+ mechanosensory channel. This subsequently triggers the BMP2/Smad biochemical signaling pathway, leading to differentiation of NSCs into the neuronal phenotype. Signaling through the Piezo1-Ca2+-BMP2/Smad pathway can be further accelerated by application of an external shear stress force using low-intensity pulsed ultrasound. More importantly, magnetic reson...
Source: Small - Category: Nanotechnology Authors: Tags: Research Article Source Type: research