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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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Wireless sequential dual light delivery for programmed PDT in vivo.

Jiayi Liu1, Bowen Sun2, Wenkai Li3

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This study introduces a smart nanocarrier system for photodynamic therapy (PDT). This system enhances cancer treatment by light-degradable carriers and sequential photosensitizer activation, improving safety and efficacy.

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Oncology

Background:

  • Photodynamic therapy (PDT) faces challenges in treating deep cancers due to poor photosensitizer delivery and light penetration.
  • Photosensitizer self-quenching within nanocarriers and limited reactive oxygen species (ROS) diffusion reduce PDT efficacy.
  • A smart nanocarrier system is needed for light-triggered degradation and photosensitizer activation to overcome these limitations.

Purpose of the Study:

  • To develop a light-sensitive polymer nanocarrier system for enhanced photodynamic therapy (PDT).
  • To investigate a wireless, implantable microLED device for sequential light delivery to control nanocarrier release and photosensitizer activation.
  • To optimize PDT parameters using digital simulation for improved efficacy and safety in liver cancer models.

Main Methods:

  • Synthesis of a light-sensitive polymer nanocarrier encapsulating a photosensitizer (RB-M).
  • Development of an implantable wireless dual-wavelength microLED device for sequential light irradiation.
  • Agent-based digital simulation to determine optimal irradiation time, dose, and photosensitizer concentration.
  • In vitro and in vivo validation in an orthotopic rat liver hepatocellular carcinoma model.

Main Results:

  • The developed nanocarrier system successfully degraded upon light exposure, releasing the photosensitizer.
  • Sequential low-dose light irradiation strategy enhanced PDT efficacy.
  • Reduced photosensitizer and irradiation doses were achieved, leading to successful treatment.
  • Validation in a rat liver cancer model confirmed the strategy's effectiveness and safety.

Conclusions:

  • The light-sensitive nanocarrier and sequential irradiation strategy represent a significant advancement in PDT for deep-seated cancers.
  • This approach enhances treatment safety by reducing photosensitizer and light dosage.
  • The developed system shows promise for clinical translation in improving cancer therapy outcomes.