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The goal of a targeted drug delivery system is to prolong, localize, target and have a protected drug interaction with the diseased tissue. The conventional drug delivery system is the absorption of the drug across a biological membrane, whereas the targeted release system releases the drug in a dosage form.
Gradient responsive drug delivery systems are stimulated to deliver therapeutics through contact with an endogenous chemical gradient. When the system comes into contact with its specific chemical gradient, increased concentration of the chemical can lead to the conformational change or degradation of a drug carrier to allow drug release.
Targeted drug delivery is the delivery of a drug to its target site without having an effect on other tissues. [22] Interest in targeted drug delivery has grown drastically due to its potential implications in the treatment of cancers and other chronic diseases.
The physical properties of hydrogels can be adjusted to meet specific requirements for various drug delivery systems. pH-responsive hydrogels have been extensively developed recently and have proven particularly useful for targeted cancer treatment. They can prolong drug release and are quick and cost-effective to synthesize. [12]
Gene therapy refers to the insertion of genes into a biological system in an attempt to add or modify mutated genes for therapeutic benefit. In order to attain high transgene expression, the electrostatic interaction between the gene and hydrogel polymer and the controlled release of the drug payload from the hydrogel is necessary. [36]
Nanoparticle drug delivery systems are engineered technologies that use nanoparticles for the targeted delivery and controlled release of therapeutic agents. The modern form of a drug delivery system should minimize side-effects and reduce both dosage and dosage frequency. Recently, nanoparticles have aroused attention due to their potential ...
These smart drug delivery systems are able to deliver the drug with minimal leakage, can be actively or passively targeted to different areas within the body, and will only release drug in the presence of certain triggers, creating a sustained local response and accumulation of drug at the disease area. [6]
Biomarkers are usually required to aid the selection of patients who will likely respond to a given targeted therapy. [6] Co-targeted therapy involves the use of one or more therapeutics aimed at multiple targets, for example PI3K and MEK, in an attempt to generate a synergistic response [5] and prevent the development of drug resistance. [7] [8]