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Stimuli-Responsive Drug Delivery Systems: From Concept to Clinical Translation 149
different wavelengths of light, have been extensively studied as light-responsive groups [
99]. To disassemble catanionic vesicles,
the azobenzene moiety’s configuration has been changed [99, 100]. A light-responsive catanionic self-assembly system (mul­tilamellar and unilamellar vesicles) was created from sodium dode­cyl sulfate (SDS) and 4-cholesterocarbonyl-4′-(N,N,N­triethylamine butyloxyl bromide) azobenzene (CAB). Rhodamine B and doxorubicin were released from the vesicles as a result of reversible isomerization of CAB under UV light exposure, which increased the interlamellar spacing.
To release medication without photolysis, another tactic is to alter hydrophilicity. For instance, photooxidation serves as the basis for the release mechanism in unsaturated phospholipids. When unsaturated phospholipids are oxidized using singlet oxygen, their hydrophobicity is decreased, which causes instability and increases the permeability of the liposomes [
101, 102]. Lovell
et al. utilized the unsaturated phospholipid dioleoylphosphatidyl­choline (DOPC) for the controlled release of doxorubicin loaded in porphyrin-phospholipid (PoP) liposomes under NIR [
103]. PoP,
acting as the photosensitizer, generated active singlet oxygen, which led to an acceleration of DOX release when exposed to light at 665 nm. Singlet oxygen was confirmed to be involved in the mechanism by the inhibition of drug release in the presence of an oxygen scavenger or antioxidant.
5.6 Electro­Responsive Drug Delivery Systems
In the electro-responsive gel erosion mechanism, polyelectrolyte gels can be disintegrated in the presence of an electric field. These gels are made up of two water-soluble polymers that combine to form a hydrogel through ionic or hydrogen bond interactions. The formation of these materials is depended on pH of the environ­ment. For instance, a polyallylamine and heparin complex can form over a pH range of 3–10, but it breaks down at pH 11
104]. Hydrogen bonds in the polyelectrolyte gel are broken by
[ hydroxyl ions produced during the electrolysis of water when a cathode is positioned near it and an anode is positioned away from it [
105]
he loaded drug is released as a result of the polymer
. T
complex eroding.
Hydrogels generally
have low poor conductivity, which hinders their performance as electro-responsive drug delivery systems (ESDSs). In order to improve the electrical conductivity of these hydrogels, conductive substances like graphene-based nanomater­ials, conducting polymers, and carbon nanotubes can be mixed into the polymer gel. Both single-walled and multi-walled carbon nano­tubes have been mostly used to enhance the mechanical strength and electrical properties of hydrogels [
106, 107].
For instance, Yang et al. created conductive polypyrrole-reinforced hyaluronic acid hydrogels, which improved their electrical conductivity and biocompatibility for use in biomedical applications
150 Manisha et al.
[108]. Moreover, to enhance the functionality of an electrorespon­sive delivery system, reduced graphene oxide (rGO) has been com­posited with polyethylene glycol diglycidyl ether and Jeffamine polyetheramine [
109]. When rGO is present, the electrostatic
repulsion increases at a negative applied potential, hastening the release of the drug from the composite.
5.7 Enzyme­Responsive Drug Delivery Systems

6 Conclusion

Enzyme-responsive polymeric nanoparticles have been created for the treatment of diseases such as diabetes and cancer. For example, 4-hydroxymandelic acid was utilized as the framework to construct enzyme-responsive linkers [
110]. The drug and enzyme substrates
were attached to the hydroxyl groups in the mandelate core. An enzyme found in the infected cells caused the linker to break, releasing the conjugated drug spontaneously. The work of Wong et al. provides another illustration of enzyme-responsive DDS uti­lizing polymeric nanoparticles [
111]. Liposomes have garnered
significant interest as superior drug delivery vehicles due to their numerous benefits, such as their large surface areas, appropriate sizes, and distinct chemical characteristics. By conjugating with targeting ligands that interact with receptors on the surface of the treated cell, liposomes can either passively or actively accumulate in target tissues. For example, Wan et al. reported a matrix metallo­proteinase (MMPs)-responsive liposomal formulation for gene delivery. An MMP-cleavable peptide was used as the linker to functionalize PEG chains into anionic liposomes containing adenovirus [
112].
Recent studies on the differences between pathological areas, including tumors, and normal areas have observed that pathologi­cal regions exhibit abnormal conditions such as changes in pH, temperature, and redox states, along with the downregulation or overexpression of certain receptors and transporters. These signifi­cant alterations provide novel opportunities for creating smart drug delivery systems (DDS) that are stimuli-responsive. Medications can be put into specialized car riers that react to external stimuli such as magnetic and electric fields or to the abnormal conditions of pathological areas. The smart carriers have the ability to change physically and chemically in response to these stimuli, which can lead to the controlled and selective release of the drug payload. To avoid or reduce unintended off-target effects on non-target tissues, a deeper comprehension of the stimuli sensitivity of these designed DDS is still required. One of the upcoming challenges in the development of new DDS is creating systems that can react to particular biomarkers at extremely low concentrations. Future chal­lenges in developing new DDS include investigation of cutting-

7 Notes

Stimuli-Responsive Drug Delivery Systems: From Concept to Clinical Translation 151
edge nanotechnology-based personalized medicine techniques, combination therapies, and new stimuli. Additionally, the design and development of multifunctional DDS for simultaneous diag­nosis and therapy of diseases will be another important approach. Improve the biocompatibility, stability, and specificity of systems that respond to stimuli in order to make them more suitable for clinical use.
1. Definition: Stimuli-responsive drug delivery systems are synthesized to release therapeutic drugs in response to specific physiological triggers or stimuli.
2. Types of Stimuli: Common stimuli include pH changes, redox, temperature variations, enzymatic activity, light exposure, and magnetic fields.
3. pH-Responsive Systems: Modify the release of drugs according to changes in pH in various body compartments, such as the acidic environment found in tumors.
4. Temperature-Responsive Systems: Modify drug release based on temperature changes; this is helpful for targeted therapy in the treatment of hyperthermia.
5. Enzyme-Responsive Systems: Releasing medication in reaction to the enzymatic activity found in pathological states, like cancerous tissues.
6. Light-Responsive Systems: Drug release can be triggered by light exposure by using light-responsive molecules such as azobenzenes or nitrobenzyl groups.
7. Magnetic-Responsive Systems: Under the effect of an external magnetic field, use magnetic nanoparticles to direct and release medications in particular tissues.
8. Redox-Responsive Systems: Make use of redox-responsive bonds, like disulfide linkages, to cause drug release in reaction to the intracellular environment that is reductive.
9. Electrically Responsive Systems: To enable controlled drug release, use materials that react electrochemically or change in conductivity when exposed to electric fields.
10. Advantages: Target drug release to diseased tissues or organs specifically to increase drug efficacy and decrease side effects.
11. Materials Used: properties in response to stimuli include metals, polymers, lipids, and hybrid materials.
Substances that change their physicochemical
152 Manisha et al.

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12. Controlled Release Mechanisms: Involve stimuli-induced reversible changes in material structure, such as conformational changes or degradation.
13. Current Research Trends: Improve the biocompatibility, sta­bility, and specificity of systems that respond to stimuli in order to make them more suitable for clinical use.
14. Challenges: One of the upcoming challenges in the develop­ment of new DDS is creating systems that can react to particu­lar biomarkers at extremely low concentrations.
15. Future Directions: investigation of cutting-edge nanotechnol­ogy-based personalized medicine techniques, combination therapies, and new stimuli.
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