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Related Concept Videos

Modified-Release Drug Delivery Systems: Rate-Programmed II01:19

Modified-Release Drug Delivery Systems: Rate-Programmed II

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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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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Controlled-release systems for intravaginal and intrauterine drug delivery have been developed primarily for the administration of contraceptive steroid hormones. These delivery routes circumvent first-pass hepatic metabolism, thereby enhancing bioavailability and allowing for reduced systemic dosages compared to oral administration. Such approaches contribute to improved therapeutic efficacy and patient compliance, particularly in long-term contraceptive regimens.Intravaginal Drug Delivery...
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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.
Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

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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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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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A Tripeptide-Stabilized Nanoemulsion of Oleic Acid
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Peptide-based matrices as drug delivery vehicles.

Kariem Ezzat1, Samir El Andaloussi, Rania Abdo

  • 1Department of Neurochemistry, the Arrhenius Laboratories for Natural Sciences, Stockholm University, Svante Arrhenius v 21A, SE-10691 Stockholm, Sweden.

Current Pharmaceutical Design
|December 25, 2009
PubMed
Summary

Peptide-based matrices can deliver therapeutic cargos intracellularly. These non-toxic, efficient vectors show promise for overcoming drug delivery challenges.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Biotechnology
  • Drug Delivery Systems

Background:

  • Peptides, polypeptides, and proteins are fundamental to biological systems.
  • Recent advances reveal peptide-based matrices capable of crossing biological membranes.
  • These matrices facilitate intracellular delivery of diverse therapeutic agents.

Purpose of the Study:

  • To review the characteristics of peptide-based matrices for drug delivery.
  • To highlight their applications in intracellular cargo delivery.
  • To discuss current challenges and future prospects in this field.

Main Methods:

  • Literature review of studies on peptide-based matrices.
  • Analysis of experimental data on intracellular delivery efficacy.
  • Evaluation of toxicity and carcinogenicity profiles.

Main Results:

  • Peptide-based matrices effectively deliver various cargos (small molecules, proteins, nucleic acids, nanoparticles) intracellularly.
  • These delivery systems demonstrate low toxicity and non-carcinogenic properties.
  • Proven efficacy in both in vitro and in vivo settings.

Conclusions:

  • Peptide-based matrices are promising, safe, and efficient vectors for intracellular drug delivery.
  • They offer a potential solution to limitations of existing drug delivery technologies.
  • Further research is needed to address current challenges and optimize future applications.