Photosensitive Compound Encapsulation in Polymer Nanoparticles
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Solution Overview
Problem
Current theranostic agents for cancer treatment, such as indocyanine green (ICG), face challenges due to low photostability in aqueous media and rapid clearance, limiting their effectiveness in photodynamic and photothermal therapies, and the need for separate imaging and therapeutic agents increases treatment time, effort, and cost.
Innovation Solution
A composition comprising a photosensitive compound encapsulated within biodegradable and biocompatible polymer nanoparticles, specifically mPEG-b-PCL, which provides enhanced photostability and controlled fluorescence emission, allowing for simultaneous imaging and therapeutic effects through photodynamic and photothermal mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If indocyanine green (ICG) is used as a theranostic agent, then imaging and therapeutic functions are provided, but photostability is low and clearance from the body is rapid
Solution Approach 1:
The photosensitive compound is encapsulated within the polymer nanoparticle core, creating a nested structure where the hydrophobic photosensitizer is protected inside the hydrophobic core of the amphiphilic polymer nanoparticle. This nesting provides photoprotection and prevents premature degradation while maintaining therapeutic functionality.
Solution Approach 2:
The invention uses a composite structure combining a photosensitive compound with a block copolymer (amphiphilic polymer) to create a nanoparticle system. The composite material provides both the imaging/therapeutic functions of the photosensitizer and the stability/biocompatibility of the polymer nanoparticle carrier.
2Measurement precision
If separate imaging and therapeutic agents are used, then specific imaging and treatment functions are achieved, but treatment time and cost increase
Solution Approach 1:
The invention merges imaging and therapeutic functions into a single theranostic nanoparticle platform. The photosensitive compound provides both fluorescence imaging capability and photodynamic/photothermal therapeutic functions, eliminating the need for separate imaging and treatment agents and streamlining the treatment workflow.
Solution Approach 2:
The polymer nanoparticle platform is designed as a universal theranostic carrier that can accommodate various photosensitive compounds and provide multiple functions including imaging, photodynamic therapy, and photothermal therapy through a single agent system.
3Productivity
If high concentration of photosensitive compound is used, then therapeutic effectiveness is improved, but photodegradation increases
Solution Approach 1:
The high concentration photosensitive compound is nested within the protected environment of the nanoparticle core, which shields it from environmental factors causing photodegradation. This allows loading of sufficient therapeutic dosage while maintaining photostability through the protective nanoparticle structure.
Solution Approach 2:
The hydrophobic core of the polymer nanoparticle creates a protected, inert environment for the photosensitive compound, isolating it from aqueous media and oxygen that would otherwise cause rapid photodegradation. This inert environment within the nanoparticle preserves photostability even at high loading concentrations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition enables efficient, targeted treatment of cancer cells with reduced side effects on healthy tissues by maximizing the therapeutic outcome while minimizing treatment time and costs, overcoming the limitations of existing agents by providing a single theranostic platform for imaging and therapy.
Implementation Method 1
a polymer nanoparticle that encapsulates the photosensitive compound
Implementation Method 2
Upon exposure to light of specific wavelengths, damage cancer cells by producing reactive oxygen species (ROS)
Implementation Method 3
by generating localized hyperthermia from absorbed light
Implementation Method 4
fluorescence imaging in the NIR optical window holds much promise due to minimal tissue autofluorescence and light scattering
Data Source
AI summary
Embodiments of a composition comprising a photosensitive compound and a polymer nanoparticle are disclosed herein. The composition may further comprise a targeting moiety. In some embodiments, the photosensitive compound is a phthalocyanine or phthalocyanine derivative, such as a naphthalocyanine. Upon irradiation with near infrared light, the composition may be used as a fluorescent imaging agent and/or as a phototherapeutic agent, such as for photodynamic and/or photothermal therapies. In certain embodiments, the composition is used to treat certain cancers.