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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing
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An electrically active microneedle array for electroporation.

Seong-O Choi1, Yeu Chun Kim, Jung-Hwan Park

  • 1School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Biomedical Microdevices
|December 17, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed an electrically functional microneedle array for enhanced DNA vaccine delivery. This device can electroporate skin cells, improving transfection efficiency for vaccines.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • DNA vaccines offer a promising alternative to traditional vaccines but require efficient delivery methods.
  • Electroporation enhances cellular uptake of genetic material by temporarily permeabilizing cell membranes.
  • Microneedle arrays provide a minimally invasive approach for transdermal drug and vaccine delivery.

Purpose of the Study:

  • To design and fabricate a novel microneedle array with integrated electrical functionality for enhanced DNA vaccine delivery.
  • To evaluate the mechanical and electrical performance of the microneedle array for in vivo and in vitro applications.
  • To develop a computational model for predicting electroporation parameters.

Main Methods:

  • Fabrication of a polymethylmethacrylate (PMMA) microneedle array using micromolding with a polydimethylsiloxane (PDMS) mold.
  • Integration of electrical functionality through metal deposition, laser ablation patterning, and electrodeposition.
  • In vivo testing for skin penetration and in vitro electroporation of red blood cells and prostate cancer cells.
  • Finite element simulation for computational modeling of electroporation.

Main Results:

  • The fabricated microneedle array demonstrated sufficient mechanical strength for human skin penetration.
  • The device successfully electroporated red blood cells and prostate cancer cells, indicating cell membrane permeabilization.
  • A computational model was developed to predict the effective electroporation volume based on applied voltages.
  • The study confirmed the mechanical and electrical functionalities of the microneedle array for electroporation.

Conclusions:

  • The developed microneedle array is the first MEMS-fabricated device with electrical functionality for electroporation-enhanced DNA vaccine delivery.
  • This technology holds potential for improving the efficacy of transdermal DNA vaccine administration.
  • Further research can optimize the microneedle design and electroporation parameters for clinical applications.