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Related Experiment Videos

Specific iNOS-targeted antisense knockdown in endothelial cells.

Karsten Hemmrich1, Christoph V Suschek, Guido Lerzynski

  • 1Research Group Immunobiology, Heinrich-Heine-University of Düsseldorf, D-40001 Düsseldorf, Germany.

American Journal of Physiology. Cell Physiology
|March 28, 2003
PubMed
Summary

Antisense oligonucleotides (AS-ODN) can specifically inhibit inducible nitric oxide synthase (iNOS) expression in endothelial cells (EC). Optimized protocols enhance AS-ODN uptake and intranuclear accumulation for effective iNOS knockdown.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Inducible nitric oxide synthase (iNOS) plays a role in endothelial cell function.
  • Antisense oligonucleotides (AS-ODN) offer a potential strategy for specific gene silencing.
  • Endothelial cells (EC) are key targets for in vivo therapeutic applications.

Purpose of the Study:

  • To optimize antisense oligonucleotide (AS-ODN) mediated inhibition of inducible nitric oxide synthase (iNOS) expression in primary rat endothelial cells (EC).
  • To evaluate the effectiveness and specificity of AS-ODN for iNOS knockdown in EC.
  • To identify critical parameters for successful AS-ODN delivery and function in EC.

Main Methods:

  • Incubation of primary rat EC and L929 fibroblasts with iNOS-specific AS-ODN.

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  • Optimization of experimental conditions including vehicle, serum presence, and incubation time.
  • Analysis of ODN uptake via fluorescence microscopy using labeled ODN.
  • Assessment of iNOS mRNA, protein levels, and enzyme activity following AS-ODN treatment.

    • Main Results:

    • ODN uptake was dependent on vehicle presence, with Lipofectin showing good uptake and low toxicity.
    • Omission of serum was crucial for optimal ODN uptake, potentially limiting in vivo application.
    • Intranuclear accumulation of AS-ODN was essential for effective iNOS inhibition.
    • AS-ODN treatment resulted in specific inhibition of iNOS mRNA, protein (>95%), and enzyme activity.

    Conclusions:

    • A protocol for optimized AS-ODN-mediated knockdown of iNOS in EC was established.
    • This method provides a specific and efficient tool for studying the functional impact of iNOS in endothelial cells.
    • Potential limitations for in vivo application, especially in inflammatory conditions, were identified.