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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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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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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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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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Preparation of Multifunctional Silk-Based Microcapsules Loaded with DNA Plasmids Encoding RNA Aptamers and Riboswitches
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Biologically triggered exploding protein based microcapsules for drug delivery.

Krishna Radhakrishnan1, Ashok M Raichur

  • 1Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India.

Chemical Communications (Cambridge, England)
|January 24, 2012
PubMed
Summary
This summary is machine-generated.

Biologically triggered microcapsules were created using layer-by-layer assembly. These novel microcapsules rupture controllably when exposed to trypsin, showing promise for clinical use.

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Area of Science:

  • Biomaterials science
  • Nanotechnology
  • Drug delivery systems

Background:

  • Microcapsules are widely used for controlled release applications.
  • Biologically triggered systems offer enhanced specificity for drug delivery.
  • Developing responsive materials is crucial for advanced therapeutics.

Purpose of the Study:

  • To synthesize biologically triggered exploding microcapsules.
  • To investigate the controlled rupturing behavior of these microcapsules.
  • To assess their potential for clinical applications.

Main Methods:

  • Layer-by-layer assembly of biopolymers was employed for microcapsule synthesis.
  • Exposure to trypsin, a pathologically relevant biomolecule, was used to trigger microcapsule rupture.
  • Microscopic and spectroscopic techniques were used to characterize the microcapsules and their response.

Main Results:

  • Successfully synthesized biopolymer-based microcapsules.
  • Demonstrated controlled rupturing of microcapsules upon exposure to trypsin.
  • Observed a direct correlation between trypsin concentration and rupture rate.

Conclusions:

  • Biologically triggered exploding microcapsules can be effectively synthesized using layer-by-layer assembly.
  • These microcapsules exhibit predictable and controlled rupture in response to trypsin.
  • The developed microcapsules hold significant promise for targeted clinical applications, such as enzyme-activated drug delivery.