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Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions
15:08

Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions

Published on: October 21, 2017

Nanopatterning effects on astrocyte reactivity.

Evon S Ereifej1, Howard W Matthew, Golam Newaz

  • 1Department of Biomedical Engineering, Wayne State University, Detroit, Michigan, USA.

Journal of Biomedical Materials Research. Part A
|November 28, 2012
PubMed
Summary

Optimizing neural electrode fabrication with nanotopography is key to reducing glial scarring. A 3600 nanopatterned surface demonstrated the least reactive astrocytic response, improving biocompatibility for neural implants.

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Nanotechnology

Background:

  • Minimizing glial scarring around implanted microelectrodes is crucial for device longevity.
  • Current strategies involve altering electrode geometry, roughness, size, shape, and materials.
  • Nanotopography mimicking in vivo environments enhances biocompatibility.

Purpose of the Study:

  • To determine optimal feature sizes for neural electrode fabrication that minimize astrogliosis.
  • To investigate the influence of nanotopography on neural electrode biocompatibility.
  • To define optimal nanopatterned surfaces for reduced glial response.

Main Methods:

  • Fabrication of nanopatterned surfaces using nanoimprint lithography on poly(methyl methacrylate).
  • Comparison of protein adsorption, cell morphology, adhesion, proliferation, and gene expression between patterned and control surfaces.
  • Evaluation of astrocytic response to various nanopattern dimensions.

Main Results:

  • A 3600 nanopatterned surface showed significantly reduced cellular response compared to other surfaces.
  • This surface promoted cell alignment along nanopatterns, reduced protein adsorption, and decreased cell adhesion, proliferation, and viability.
  • Inhibition of glial fibrillary acidic protein and mitogen-activated protein kinase kinase 1 was observed.

Conclusions:

  • Nanopatterned surfaces, specifically 3600 dimensions, can effectively reduce the chronic glial scar response.
  • Optimized nanotopography offers a promising strategy for developing more biocompatible neural electrodes.
  • This research addresses a gap in understanding nanotopography's role in mitigating astrogliosis.