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Related Concept Videos

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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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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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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: Mar 20, 2026

Porous Silicon Microparticles for Delivery of siRNA Therapeutics
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Calcium phosphate nanoparticles-based systems for siRNA delivery.

Xiaochun Xu1, Zehao Li1, Xueqin Zhao1

  • 1Institute of Biomaterials and Marine Biological Resources, College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, China;

Regenerative Biomaterials
|June 3, 2016
PubMed
Summary

Calcium phosphate nanoparticles offer a promising solution for delivering small interfering RNA (siRNA) therapeutics. Surface modifications enhance siRNA loading and cellular uptake, improving therapeutic efficacy.

Keywords:
calcium phosphatedeliverynanoparticlessiRNA

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Molecular Biology

Background:

  • Small interfering RNA (siRNA) holds therapeutic promise but faces delivery challenges like poor biodistribution and intracellular bioavailability.
  • Calcium phosphate (CaP) co-precipitates are established, non-toxic materials for in vitro transfection.
  • Effective siRNA delivery requires overcoming cell membrane barriers and endosomal escape for sustained action.

Purpose of the Study:

  • To review current research on Calcium Phosphate (CaP) nanoparticles for siRNA delivery.
  • To highlight surface modification strategies for enhancing CaP nanoparticle functionality.
  • To discuss various CaP nanoparticle formulations for improved siRNA therapeutics.

Main Methods:

  • Review of existing literature on CaP nanoparticles for siRNA delivery.
  • Analysis of surface modification techniques to achieve positive surface charge.
  • Classification of CaP nanoparticles based on coating materials (lipid, polymer, etc.).

Main Results:

  • Surface modification of CaP nanoparticles enables efficient siRNA loading and cell membrane penetration.
  • Positively charged CaP nanoparticles facilitate endosomal escape, leading to sustained siRNA release.
  • Various coating strategies (lipid, polymer) are explored to optimize CaP nanoparticle performance.

Conclusions:

  • CaP nanoparticles are a viable platform for developing effective siRNA delivery systems.
  • Surface engineering of CaP nanoparticles is crucial for overcoming biological barriers.
  • Further research into tailored CaP nanoparticle designs can advance siRNA-based therapies.