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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

127
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.
141

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Related Experiment Video

Updated: Apr 14, 2026

Polyethyleneimine-coated Iron Oxide Nanoparticles as a Vehicle for the Delivery of Small Interfering RNA to Macrophages In Vitro and In Vivo
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Ionizable Polymeric Micelles Targeting Transferrin Receptor 1 Enhance Systemic mRNA Delivery to the Brain.

Jumpei Norimatsu1,2,3, Hayato L Mizuno3,4, Yuki Mochida1,3

  • 1Department of Advanced Nanomedical Engineering, Medical Research Laboratory, Institute of Integrated Research, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.

Molecular Pharmaceutics
|April 13, 2026
PubMed
Summary

We created a novel nanocarrier for systemic messenger RNA (mRNA) delivery to the brain, overcoming biological barriers to treat central nervous system (CNS) disorders effectively.

Keywords:
central nervous systemligand installationmRNApolymeric nanocarrierself-assembly

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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Neuroscience

Background:

  • Messenger RNA (mRNA) therapies show promise but face challenges in treating central nervous system (CNS) disorders.
  • Key barriers include rapid degradation, limited brain penetration, and endosomal entrapment, hindering effective delivery.

Purpose of the Study:

  • To develop a polymeric micelle-based nanocarrier for systemic mRNA delivery to the brain.
  • To overcome biological barriers and enable robust in situ protein production in the CNS.

Main Methods:

  • A nanocarrier was engineered using triphenylphosphonium (TPP) for mRNA complexation and prolonged circulation.
  • PEG-polyaspartamide derivatives with pH-responsive amines facilitated endosomal escape.
  • Antibody fragments targeting transferrin receptor 1 were conjugated for brain targeting via click chemistry.

Main Results:

  • The nanocarrier system achieved significant in situ protein production in the brain after systemic administration.
  • A ~10-fold increase in brain delivery was observed compared to initial formulations.
  • Reduced off-target expression in other organs was noted.

Conclusions:

  • The developed nanocarrier platform enables effective systemic mRNA delivery to the brain.
  • This approach offers a promising strategy for treating CNS disorders.
  • Further research into this platform could advance mRNA-based therapeutics for neurological conditions.