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Neurons Internalize Functionalized Micron-Sized Silicon Dioxide Microspheres.

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Neurons can internalize larger microparticles (1-2 micrometers) than previously thought, challenging existing neuroscience delivery platform concepts. This discovery opens new avenues for neuroengineering and targeted drug delivery within neurons.

Keywords:
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Area of Science:

  • Neuroscience
  • Biomedicine
  • Materials Science

Background:

  • Neurons were traditionally considered non-phagocytic, limiting microparticle uptake to <0.5 micrometers.
  • Existing literature suggests neurons cannot internalize larger microparticles.

Purpose of the Study:

  • To investigate neuron-specific delivery of microparticles larger than 0.5 micrometers.
  • To determine the maximum size and surface charge of microparticles neurons can internalize.
  • To assess the impact of microparticle internalization on neuron viability.

Main Methods:

  • Utilized SH-SY5Y human neuroblastoma cells and primary cortical neurons in vitro.
  • Employed flow cytometry, fluorescence-activated cell sorting, confocal, and electron microscopy.
  • Administered fluorescently labeled silica microspheres (1-2 micrometers) with varying surface charges via in vitro incubation and in vivo rat striatum injection.

Main Results:

  • SH-SY5Y cells rapidly internalized 1-micrometer microspheres with diverse surface charges (-70 mV to +40 mV) within 2-4 hours.
  • Neurons internalized microspheres up to 2 micrometers in diameter without significant impact on cell viability.
  • In vivo studies confirmed microparticle internalization within neurons in the rat brain.

Conclusions:

  • Neurons can internalize microparticles up to 2 micrometers in diameter, irrespective of surface charge.
  • This finding expands the potential of microparticles as neuron-specific delivery platforms.
  • Enables novel neuroscience and neuroengineering applications, including intracellular microdevices.