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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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Mechanical Stimulation of Chondrocyte-agarose Hydrogels
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Super Mechanical Stimuli Responsive Hydrogel: Dynamic Cues for Cell Applications.

Ravichandran H Kollarigowda, Anu Stella Mathews, Sinoj Abraham

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    Summary

    This study developed a thermosensitive hydrogel using NIPAM and hyaluronic acid (HA) for tissue engineering. The hydrogel

    Keywords:
    IPN gelPNIPAM hydrogelcell interaction materialshyaluronic acidstimuli-responsive hydrogels

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    Area of Science:

    • Biomaterials Science
    • Polymer Chemistry
    • Tissue Engineering

    Background:

    • Thermosensitive hydrogels offer tunable properties for biomedical applications.
    • Hyaluronic acid (HA) incorporation enhances oxygen permeability and biocompatibility.
    • Stimuli-responsive materials are crucial for advanced tissue engineering scaffolds.

    Purpose of the Study:

    • To fabricate and characterize a novel NIPAM-based thermosensitive hydrogel incorporating HA.
    • To investigate the mechanical properties and temperature-dependent behavior of the NIPAM-HA-MA hydrogel.
    • To evaluate the biocompatibility and cell interaction of the hydrogel with human dermal fibroblasts (HDFs).

    Main Methods:

    • Fabrication of an interpenetrating network (IPN) hydrogel using NIPAM, HA, and MA via UV cross-linking.
    • Mechanical property analysis (Young's modulus, shear strain) at varying temperatures (25-35 °C).
    • Cell culture studies using HDFs to assess cell adherence at different temperatures (25 °C and 37 °C).

    Main Results:

    • The NIPAM-HA-MA hydrogel demonstrated thermosensitive behavior, with reduced mechanical properties at higher temperatures (25-35 °C).
    • Increased temperature led to decreased rigidity, while lower temperatures enhanced gel stiffness due to NIPAM's properties.
    • The hydrogel exhibited good transparency and biocompatibility, with optimal HDF cell adherence observed at 37 °C.

    Conclusions:

    • The developed NIPAM-HA-MA hydrogel is a transparent, biocompatible, and stimuli-responsive material.
    • Its temperature-dependent mechanical properties and cell interaction make it a promising candidate for cell-instructive biomaterials.
    • This hydrogel holds potential for applications in tissue engineering and regenerative medicine.