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Methods of Nuclear Reprogramming

Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.

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Isolation, Expansion, and Nucleofection of Neural Stem Cells from Adult Murine Subventricular Zone
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Astrocytic responses to DNA delivery using nucleofection.

H Muyderman1, W P Yew, B Homkajorn

  • 1Centre for Neuroscience, Flinders Medical Science and Technology, School of Medicine, Flinders University, Adelaide, SA, Australia. hakan.muyderman@flinders.edu.au

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|August 24, 2010
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Summary

Nucleofection efficiently transfects primary astrocytes but causes lasting changes. These cells show reduced re-attachment, proliferation, and impaired wound closure post-transfection.

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Area of Science:

  • Cell biology
  • Molecular biology
  • Neuroscience

Background:

  • Nucleofection is a non-viral method for high-efficiency DNA delivery.
  • Astrocytes are crucial glial cells in the central nervous system.
  • Primary astrocyte cultures are vital for studying astrocyte biology.

Purpose of the Study:

  • To evaluate the efficiency and impact of nucleofection on primary astrocytes.
  • To assess post-transfection effects on astrocyte viability, proliferation, and function.

Main Methods:

  • Primary astrocytes were subjected to nucleofection with plasmid DNA.
  • Transfection efficiency and cytotoxicity were quantified.
  • Astrocyte re-attachment, proliferation, and migration (scratch assay) were analyzed.
  • Cell morphology, including polynucleation, was examined.

Main Results:

  • Nucleofection achieved high transfection efficiency (76 ± 9%) with low initial cytotoxicity.
  • Nucleofected astrocytes exhibited reduced re-attachment and impaired proliferation.
  • Cell densities were significantly decreased in the first 72 hours post-transfection.
  • A small percentage of polynucleated cells were observed.
  • Impaired wound closure indicated reduced astrocyte migratory function.

Conclusions:

  • Nucleofection is an effective method for DNA delivery into primary astrocytes.
  • The nucleofection process induces significant, long-lasting alterations in astrocyte behavior and function.
  • Careful consideration of these induced changes is necessary when designing and interpreting astrocyte nucleofection studies.