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

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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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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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Rate-programmed drug delivery systems (DDS) are designed to release drugs at specific, controlled rates to maintain consistent therapeutic levels. These systems are categorized based on their release mechanisms, including dissolution-controlled DDS, diffusion-controlled DDS, and combined dissolution-diffusion-controlled DDS.In dissolution-controlled DDS, the release rate depends on the slow dissolution of the drug itself or the surrounding matrix. Drugs with inherently slow dissolution rates,...
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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...
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Self-Disassembling Macroporous Metal-Organic Framework-Based Micromotors with Magnetically Controlled Motion for

Javier Bujalance Fernández1, Víctor de la Asunción-Nadal1, Beatriz Jurado Sánchez1,2

  • 1Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Universidad de Alcala, Alcala de Henares, Madrid, E-28802, Spain.

Small Methods
|June 3, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces magnetic micromotors (MMs) for sequential drug delivery. These MMs carry two cancer drugs, releasing them at different rates based on pH changes, improving targeted cancer treatment.

Keywords:
5‐fluorouracilcancer cellsdeliverydoxorubicinzeolitic imidazole frameworks

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Biomedical Engineering

Background:

  • Developing advanced drug delivery systems is crucial for effective cancer therapy.
  • Metal-organic frameworks (MOFs) offer tunable properties for drug encapsulation.
  • Magnetic nanoparticles enable targeted delivery and controlled motion of therapeutic agents.

Purpose of the Study:

  • To synthesize macroporous zeolitic imidazole framework (ZIF)-based magnetic micromotors (MMs).
  • To achieve dual encapsulation and pH-triggered sequential release of 5-fluorouracil (5-FU) and doxorubicin (DOX).
  • To demonstrate targeted drug delivery and cancer cell interaction using these MMs.

Main Methods:

  • Synthesis of MMs using superparamagnetic iron oxide nanoparticles (Fe₃O₄) in methanolic solutions.
  • Dual encapsulation of 5-FU (within macroporous structure) and DOX (on the surface).
  • In vitro testing using Caco-2 cells to evaluate drug release and cellular effects.

Main Results:

  • High loading capacity for 5-FU (72.8 µg/mg) and DOX (3 µg/mg).
  • Acidic pH triggers rapid release of DOX and sustained release of 5-FU due to ZIF-8 degradation.
  • Demonstrated targeted delivery and reduced cancer cell viability in vitro.

Conclusions:

  • The developed MMs represent a novel pH-sensitive, magnetically guided system for sequential dual-drug delivery.
  • This approach offers a promising strategy for enhanced cancer chemotherapy with controlled drug release kinetics.
  • This is the first magnetic MOF-based MM capable of sequential pH-triggered release of two drugs.