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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

57
Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Modified-Release Drug Delivery Systems: Site-Targeted01:24

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Site-targeted drug delivery systems enhance therapeutic efficacy while minimizing systemic toxicity and treatment costs. Unlike conventional methods, these systems ensure precise drug delivery, improving bioavailability and reducing side effects. Targeted drug delivery is classified into three levels. First-order targeting directs drugs to the capillary beds of specific organs or tissues. Second-order targets specific cell types, such as tumor cells, using receptor-mediated interactions.
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Related Experiment Video

Updated: Feb 24, 2026

Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
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Minicircle Versus Plasmid DNA Delivery by Receptor-Targeted Polyplexes.

Ana Krhac Levacic1, Stephan Morys1, Susanne Kempter2

  • 11 Pharmaceutical Biotechnology, Center for System-based Drug Research, and Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München , Munich, Germany .

Human Gene Therapy
|August 23, 2017
PubMed
Summary

Minicircle DNA (MC DNA) offers improved biosafety and gene transfer compared to plasmid DNA (pDNA). Targeted MC DNA polyplexes achieved significantly higher gene delivery efficiency in prostate cancer cells.

Keywords:
c-Metminicircle DNAplasmid DNAreceptor-targeting

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Area of Science:

  • Biotechnology
  • Gene Therapy
  • Nanomedicine

Background:

  • Plasmid DNA (pDNA) is widely used for gene delivery but faces challenges in biosafety and efficiency.
  • Minicircle DNA (MC DNA) offers advantages due to its smaller size and absence of bacterial backbone sequences.
  • Targeted delivery systems can enhance gene transfer efficiency and specificity.

Purpose of the Study:

  • To compare the physicochemical and biological characteristics of polyplexes formulated with MC DNA versus pDNA.
  • To evaluate the gene transfer efficiency of c-Met targeted polyplexes using MC DNA and pDNA.
  • To investigate the potential of MC DNA as a superior non-viral vector for gene delivery.

Main Methods:

  • Formulation of polyplexes using MC DNA (MC07.CMV-luc) and pDNA (pCMV-luc) with c-Met targeted, PEG-shielded oligoaminoamides or linear polyethylenimine (linPEI).
  • Characterization of polyplex physicochemical properties, including size and shape.
  • Assessment of gene transfer efficiency in c-Met-positive DU145 prostate carcinoma cells, evaluating cell cycle dependence.

Main Results:

  • Polyplexes formed with MC DNA were significantly smaller (35-40 nm) than those with pDNA (65-100 nm).
  • c-Met targeted polyplexes exhibited compacted rod structures, with size influenced by DNA type and carrier.
  • MC DNA polyplexes demonstrated a ~200-fold enhancement in gene transfer efficiency compared to pDNA analogues.
  • Transfection mediated by MC DNA polyplexes was independent of the cell cycle.

Conclusions:

  • Minicircle DNA is a promising non-viral vector for gene delivery, offering enhanced biosafety and superior gene transfer efficiency.
  • Targeted MC DNA polyplexes can be optimized for efficient delivery to specific cancer cells, like DU145 prostate carcinoma.
  • MC DNA represents a significant advancement over pDNA for gene therapy applications, particularly in overcoming transfection limitations.