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Site-Targeted Drug Delivery Systems: Polymeric Carriers

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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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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.

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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...

Cellular Membranes and Drug Transport

Cellular Membranes and Drug Transport

Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
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Related Experiment Video

Updated: May 24, 2026

Construction of Cyclic Cell-Penetrating Peptides for Enhanced Penetration of Biological Barriers

Construction of Cyclic Cell-Penetrating Peptides for Enhanced Penetration of Biological Barriers

Published on: September 19, 2022

Peptides for cell-selective drug delivery.

Nina Svensen¹, Jeffrey G A Walton, Mark Bradley

¹School of Chemistry, University of Edinburgh, Joseph Black Building, West Mains Road, Edinburgh, EH9 3JJ, UK.

Trends in Pharmacological Sciences

|March 20, 2012

Summary

Peptides can act as homing devices, targeting specific tissues for drug delivery. This review highlights homing peptides (HPs) and cell-penetrating homing peptides (CPHPs) for targeted therapies.

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Published on: March 25, 2015

Area of Science:

Biotechnology
Molecular Biology
Pharmacology

Background:

Targeting specific cell types for optimal therapeutic distribution is a key challenge in medicine.
Minimizing off-target effects is crucial for patient safety and treatment efficacy.

Purpose of the Study:

This review focuses on peptidic tissue-specific biomarkers.
It highlights homing peptides (HPs) and cell-penetrating homing peptides (CPHPs) as targeted delivery systems.

Main Methods:

Review of literature on peptidic biomarkers for tissue-specific targeting.
Focus on HPs and CPHPs for drug, oligonucleotide, and nanoparticle delivery.
Examination of peptides in clinical trials, including NGR and cRGD.

Main Results:

Homing peptides facilitate targeted delivery of therapeutic cargos into specific cells and tissues.
Cell-penetrating homing peptides enhance cellular uptake.
Examples like NGR and cRGD demonstrate clinical potential in targeting tumor vasculature and integrins.

Conclusions:

Peptidic biomarkers offer a promising strategy for targeted drug delivery.
HPs and CPHPs can be engineered as effective homing devices for various therapeutic applications.
Clinical translation of peptides like NGR and cRGD underscores their therapeutic value.