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Published on: July 31, 2015
Spermine modified starch-based carrier for gene delivery: Structure-transfection activity relationships
Xiaoyi Huang1, Xiaoxi Li2, Ling Chen2
1Ministry of Education Engineering Research Center of Starch & Protein Processing, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, South China University of Technology, Guangzhou 510640, China; Department of Chemistry, Materials, and Chemical Engineering "G.Natta", Politecnico di Milano, Milan 20131, Italy.
Spermine modified starch (SMS) gene carriers demonstrate high transfection efficiency and low cytotoxicity. These novel starch-based carriers show promise for gene delivery applications.
Area of Science:
- Biomaterials Science
- Gene Therapy
- Nanotechnology
Background:
- Developing safe and effective gene delivery vectors is crucial for gene therapy.
- Starch-based materials offer potential as biocompatible gene carriers.
- Cationic modification of starch can enhance its gene-binding and cellular uptake capabilities.
Purpose of the Study:
- To develop novel starch-based gene carriers with improved transfection efficiency and reduced cytotoxicity.
- To investigate the structure-property relationships of spermine modified starch (SMS) / plasmid DNA (pDNA) complexes.
- To evaluate the performance of SMS/pDNA complexes in simulated endosomal environments.
Main Methods:
- Cationic modification of starch (50kDa) with spermine to create spermine modified starch (SMS).
- Formation of self-assembly nanocomplexes between SMS and plasmid pAcGFP1-C1 (pDNA).
- Assessment of cytotoxicity and transfection efficiency in HepG2 cell lines.
- Characterization of SMS/pDNA complexes using Dynamic Light Scattering (DLS) and Small Angle X-ray Scattering (SAXS) under varying pH conditions.
Main Results:
- SMS-DS3, with the highest primary amine content (1.17μmolmg⁻¹), formed SMS/pDNA complexes exhibiting the highest transfection efficiency (∼40%) at a weight ratio of 25.
- SMS/pDNA complexes demonstrated low cytotoxicity in HepG2 cells.
- Structural analysis revealed that SMS-DS3/pDNA complexes (∼180nm) maintained moderately compact structures in simulated acidified endosomal environments (pH 5.0-7.4), with minimal changes in particle size and slightly shrunken shapes.
Conclusions:
- Spermine modified starch (SMS) is a promising candidate for developing safe and efficient non-viral gene delivery systems.
- The structural stability of SMS/pDNA complexes in acidic endosomal environments contributes to their superior transfection efficiency.
- Optimized SMS formulations offer a viable alternative to existing gene carriers, potentially advancing gene therapy applications.
