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Modified-Release Drug Delivery Systems: Site-Targeted

Modified-Release Drug Delivery Systems: Site-Targeted

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.

Site-Targeted Drug Delivery Systems: Polymeric Carriers

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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...

Modified-Release Drug Delivery Systems: Classification

Modified-Release Drug Delivery Systems: Classification

Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...

Drug Delivery Systems: Different Types

Drug Delivery Systems: Different Types

Conventional oral drug products, termed immediate-release (IR) formulations, are engineered to promptly release their active pharmaceutical ingredient (API) upon ingestion, typically in tablets or capsules. This rapid release often results in swift drug absorption and consequent pharmacodynamic effects, although the timing and intensity can vary depending on the drug's properties. Prodrugs within these formulations require metabolic conversion to activate their pharmacodynamic effects,...

Oral Drug Delivery Systems: Introduction

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Oral drug delivery is the most common route of administration due to its convenience, cost-effectiveness, and high patient compliance. It enables precise formulation to ensure proper drug dosage and bioavailability. The development of oral dosage forms considers drug properties such as solubility, stability, and absorption to optimize therapeutic efficacy.Tablets, capsules, liquids, and chewable formulations enhance drug stability, mask undesirable tastes, and improve patient experience.

Modified-Release Drug Delivery Systems: Stimuli-Activated

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...

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Related Experiment Video

Updated: Jun 24, 2026

Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery

Preparation of Neutrally-charged, pH-responsive Polymeric Nanoparticles for Cytosolic siRNA Delivery

Published on: May 2, 2019

Targeted delivery systems for oligonucleotide therapeutics.

Bo Yu¹, Xiaobin Zhao, L James Lee

¹Department of Chemical and Biomolecular Engineering, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA.

The AAPS Journal

|March 20, 2009

Summary

Therapeutic oligonucleotides, like antisense oligonucleotides and small interfering RNA (siRNA), require effective delivery systems. Targeted delivery strategies are crucial for overcoming biological barriers and enhancing treatment efficacy for various diseases.

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Area of Science:

Biotechnology
Molecular Medicine
Drug Delivery Systems

Background:

Oligonucleotides, including antisense oligonucleotides and small interfering RNA (siRNA), show therapeutic potential for diverse diseases.
Efficient delivery is paramount for the clinical success of these nucleic acid-based therapies.
Current challenges involve overcoming biological barriers to ensure target site access.

Purpose of the Study:

To review recent advancements in targeted delivery systems for therapeutic oligonucleotides.
To provide a perspective on the progress and future directions in oligonucleotide delivery research.

Main Methods:

Literature review of recent studies on oligonucleotide delivery platforms.
Analysis of various targeting ligands and their efficacy.
Discussion of strategies to overcome biological barriers.

Main Results:

Targeted delivery systems significantly enhance oligonucleotide efficiency and specificity.
Multiple platform technologies and targeting ligands have been developed.
Progress has been made in addressing biological barriers for improved delivery.

Conclusions:

Targeted delivery is key to unlocking the full therapeutic potential of oligonucleotides.
Continued innovation in delivery systems is essential for clinical translation.
This field holds significant promise for treating a wide range of diseases.