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Related Concept Videos

Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

109
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

Modified-Release Drug Delivery Systems: Site-Targeted

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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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Generation of Cationic Nanoliposomes for the Efficient Delivery of In Vitro Transcribed Messenger RNA
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Formulation-Driven Control of mRNA Polyplex Physicochemical Properties Enables Spleen-Targeted Systemic Delivery.

Mao Hori1, Nan Qiao2,3, Kohki Yamada3

  • 1Laboratory for Biomaterials and Bioengineering, Institute of Integrated Research, Institute of Science Tokyo, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.

ACS Applied Bio Materials
|March 30, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a simple method to control messenger RNA (mRNA) delivery using a novel polyaspartamide. Adjusting the ionic environment shifted mRNA expression from the lungs to the spleen, enhancing immune responses for potential vaccines.

Keywords:
mRNAnanovaccinepolyplexspleen targetingsystemic delivery

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Immunology

Background:

  • Efficient and organ-selective delivery of messenger RNA (mRNA) therapeutics is crucial but challenging.
  • Current delivery systems require extensive material design efforts.

Purpose of the Study:

  • To develop a simple formulation-based strategy for controlling mRNA polyplex physicochemical properties and biodistribution.
  • To investigate the impact of ionic environment modulation on mRNA delivery and immune response.

Main Methods:

  • Formulation of mRNA polyplexes using an amphiphilic polyaspartamide derivative (PAsp(DET/CHE)).
  • Systematic modulation of polyplexes' N/P ratio and incubation with physiological saline (150 mM NaCl).
  • Assessment of polyplex physicochemical properties, in vivo biodistribution, and antigen-specific immune responses (humoral and cellular) following ovalbumin (OVA) mRNA delivery.

Main Results:

  • Polyplex size and surface potential influenced biodistribution after systemic administration.
  • Incubation with NaCl induced controlled particle growth without mRNA release.
  • NaCl-processed polyplexes shifted mRNA expression from lung to spleen, with accumulation in antigen-presenting cells.
  • Robust antigen-specific humoral and cellular responses were observed after OVA mRNA delivery.

Conclusions:

  • Fine-tuning the ionic environment offers a facile method to control mRNA polyplex assembly and in vivo distribution.
  • This approach provides a scalable route to organ-selective mRNA delivery systems for vaccination and other applications.