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Related Concept Videos

Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

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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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: Classification01:23

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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 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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Parenteral drug delivery systems play a crucial role in modern therapeutics by enabling the direct administration of drugs into the systemic circulation, bypassing the gastrointestinal tract. These systems are particularly valuable for poorly absorbed oral medications that are unstable in the digestive environment or require rapid onset or sustained therapeutic levels. Delivery is achieved through intravenous, intramuscular, or subcutaneous routes, each selected based on the drug's properties...
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Synthesis of Gold Nanoparticle Integrated Photo-responsive Liposomes and Measurement of Their Microbubble Cavitation upon Pulse Laser Excitation
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Trigger release liposome systems: local and remote controlled delivery?

Sagida Bibi1, E Lattmann, Afzal R Mohammed

  • 1Medicines Research Unit, Aston University, Birmingham, B4 7ET, UK.

Journal of Microencapsulation
|January 3, 2012
PubMed
Summary
This summary is machine-generated.

Trigger-release liposomes enhance drug delivery by targeting specific sites and controlling drug release. This review explores advancements in liposome technology for improved bioavailability and reduced toxicity.

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Area of Science:

  • Biomedical Engineering
  • Drug Delivery Systems
  • Nanotechnology

Background:

  • Target-specific drug delivery is crucial for enhancing bioavailability and minimizing drug toxicity.
  • Liposomes are advanced drug carriers offering controlled release and targeting capabilities.
  • Trigger-release liposomes represent a sophisticated approach to localized and timed therapeutic agent delivery.

Purpose of the Study:

  • To review the development of trigger-release liposome systems.
  • To highlight current research in advanced liposome-based drug delivery.
  • To discuss mechanisms for controlled drug release from liposomes.

Main Methods:

  • Categorization of trigger-release liposomes based on release stimuli (environmental or external physical).
  • Discussion of targeting strategies, including the use of antibodies.
  • Review of literature on liposome design and functionalization for triggered release.

Main Results:

  • Trigger-release liposomes can be activated by local environmental cues (pH, enzymes) or external stimuli (heat, ultrasound, light).
  • Incorporation of targeting moieties enhances specificity for diseased tissues.
  • These systems offer precise control over drug release kinetics and localization.

Conclusions:

  • Trigger-release liposomes are a promising platform for advanced, targeted drug delivery.
  • Further research in this field can lead to more effective and safer therapeutic strategies.
  • Liposome technology continues to evolve, offering enhanced control over drug bioavailability and reduced systemic toxicity.