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Intracellular miRNA or siRNA delivery and function.

Vladimir P Zhdanov1

  • 1Section of Biological Physics, Department of Physics, Chalmers University of Technology, Göteborg, Sweden; Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk, Russia.

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Summary

Nanocarrier delivery of short non-coding RNA (ncRNA) can suppress gene expression. Bistable gene expression allows ncRNA to induce long-lasting state transitions, impacting drug development.

Keywords:
Drug deliveryGene expressionMean-field kinetic equationsSubcellular processes

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Nanocarriers are explored for delivering short non-coding RNA (ncRNA) like miRNA and siRNA.
  • ncRNA delivery aims to suppress specific mRNA and protein levels for therapeutic purposes.
  • Understanding the kinetics of ncRNA delivery and gene silencing is crucial for developing novel drugs.

Purpose of the Study:

  • To analyze the transient kinetics of nanocarrier-mediated ncRNA delivery and its impact on gene expression.
  • To investigate gene expression dynamics with and without feedback mechanisms, including bistability.
  • To determine the quantitative requirements for effective ncRNA-mediated gene suppression.

Main Methods:

  • Development of three generic kinetic models for gene expression.
  • Simulation of ncRNA delivery and release using nanocarriers.
  • Analysis of transient kinetics and steady-state transitions in gene expression models.

Main Results:

  • Without feedback, mRNA and protein suppression by ncRNA is transient.
  • Bistable gene expression allows ncRNA to induce prolonged state transitions.
  • Significant gene expression effects require cytoplasmic ncRNA concentrations exceeding 1000 molecules.

Conclusions:

  • Nanocarrier-mediated ncRNA delivery can lead to transient or sustained gene silencing.
  • Bistability in gene expression is key for long-term ncRNA-induced effects.
  • Effective therapeutic strategies require careful consideration of ncRNA concentration and cellular kinetics.