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Related Concept Videos

Modified-Release Drug Delivery Systems: Site-Targeted01:24

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...
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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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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
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Manufacture and Drug Delivery Applications of Silk Nanoparticles
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Huibin Chang, Anup Dey, Tengfei Ma

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    This study introduces a novel method for controlled drug delivery using human serum albumin nanoparticles. Vancomycin modulates the release of other drugs, enabling simultaneous delivery and predictable release kinetics.

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    Area of Science:

    • Biomaterials Science
    • Nanotechnology
    • Pharmacology

    Background:

    • Controlled drug delivery systems aim to improve therapeutic efficacy and minimize side effects.
    • Challenges exist in achieving targeted delivery and controlled release rates, leading to off-target accumulation.
    • Human serum albumin (HSA)-based nanoparticles offer potential for drug delivery applications.

    Purpose of the Study:

    • To develop a novel strategy for simultaneous multiple drug encapsulation and controlled release.
    • To investigate the modulation of drug release kinetics using a small molecule modulator within HSA nanoparticles.
    • To explore the mechanism underlying drug release modulation based on albumin's secondary structure.

    Main Methods:

    • Fabrication of human serum albumin (HSA)-based nanoparticles for drug encapsulation.
    • Incorporation of multiple drugs, including vancomycin, sulfasalazine, and epidermal growth factor.
    • In vitro assessment of drug release kinetics in aqueous conditions, modulated by vancomycin.
    • Mechanistic investigation of drug-HSA interactions and their effect on albumin secondary structure.

    Main Results:

    • Demonstrated successful encapsulation and simultaneous release of multiple drugs from HSA nanoparticles.
    • Showcased vancomycin's ability to modulate the release rates of other encapsulated drugs (e.g., sulfasalazine, epidermal growth factor) without external stimuli.
    • Identified a correlation between drug release kinetics and alterations in the secondary structure of albumin.
    • Achieved predictable and sustained drug release profiles through drug-induced structural modulation.

    Conclusions:

    • A novel water-soluble drug modulation strategy was developed for controlled release from HSA nanoparticles.
    • This approach enables simultaneous delivery of multiple therapeutics with predictable release kinetics.
    • The findings offer a promising platform for advanced drug delivery systems with enhanced therapeutic outcomes.