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Related Experiment Videos

Modified linear polyethylenimine-cholesterol conjugates for DNA complexation.

Darin Y Furgeson1, Winter S Chan, James W Yockman

  • 1Department of Pharmaceutics and Pharmaceutical Chemistry, Center for Controlled Chemical Delivery, University of Utah, Salt Lake City, Utah 84112-5820, USA.

Bioconjugate Chemistry
|July 17, 2003
PubMed
Summary

Cholesterol-modified linear polyethylenimine (LPEI) gene carriers show enhanced transfection and lower toxicity than branched forms. These novel LPEI-cholesterol (LPC) conjugates effectively deliver genes via receptor-mediated endocytosis.

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Area of Science:

  • Biomaterials Science
  • Gene Delivery Systems
  • Nanotechnology

Background:

  • Linear polyethylenimine (LPEI) offers superior gene transfection and reduced cytotoxicity compared to branched polyethylenimine (BPEI).
  • Modifying LPEI with cholesterol can potentially enhance its gene delivery capabilities.

Purpose of the Study:

  • To synthesize and characterize novel LPEI-cholesterol (LPC) conjugates with varying cholesterol geometries (linear, T-shaped, linear/T-shaped).
  • To evaluate the efficacy and safety of LPC conjugates as nonviral gene carriers for pDNA delivery.

Main Methods:

  • Synthesis of LPC conjugates (LPC-L, LPC-T, LPC-LT) from high molecular weight LPEI and cholesterol.
  • Physical characterization of LPC/pDNA complexes: particle size, zeta potential, DNase protection assay, atomic force microscopy (AFM).

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  • In vitro transfection efficiency and cytotoxicity assays using B16-F0 and Renca cells, confirmed by EGFP flow cytometry and mIL-12 p70 expression.

    • Main Results:

    • LPC-T/pDNA complexes at N/P 10/1 exhibited optimal particle size (~250 nm), positive zeta potential (+10 mV), and protected pDNA from DNase I for 180 min.
    • LPC-L and LPC-T conjugates demonstrated significantly higher protein expression than LPEI and BPEI, with no significant loss in cell viability.
    • Transfection mechanism involves receptor-mediated endocytosis via the LDL-R pathway, with reduced expression upon LDL-R site saturation.

    Conclusions:

    • Cholesterol modification of LPEI, particularly in T-shaped geometries, enhances gene delivery efficiency and maintains low cytotoxicity.
    • The 'unprotonated reserves' mechanism, facilitated by cholesterol's hydrophobic protection, contributes to improved transfection rates.
    • LPC conjugates represent a promising class of nonviral gene vectors utilizing specific cellular uptake pathways.