Fluorescent Metal Oxide Nanoparticles for Multi-Modality Imaging
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Solution Overview
Problem
Current molecular imaging techniques face challenges in delivering biocompatible optical and MRI agents to specific molecular targets, due to delivery barriers, low affinity of monovalent ligands, limited target-to-background ratios, and stability issues, which hinder effective in vivo imaging for disease detection and treatment monitoring.
Innovation Solution
Development of fluorescent metal oxide nanoparticles with high fluorescent brightness and magnetic properties, featuring a polymer coating that allows for efficient attachment of fluorochromes and biomolecules, providing multi-modality imaging capabilities for both optical and MRI applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical imaging probes are used, then imaging sensitivity can be achieved, but delivery to specific molecular targets is limited due to delivery barriers and low affinity of monovalent ligands
Solution Approach 1:
The patent uses composite nanoparticle structures combining metal oxide cores with polymer coatings and multiple fluorochrome dyes. This composite approach creates a platform that simultaneously provides magnetic resonance imaging contrast, optical fluorescence signaling, and stable target delivery through multivalent ligand presentation, resolving the contradiction between imaging sensitivity and reliable target delivery
Solution Approach 2:
The nanoparticle platform is designed to perform multiple functions simultaneously: providing MRI contrast through metal oxide cores, optical imaging through fluorochromes, and specific target delivery through attached ligands. This multi-functionality allows a single agent to address both the sensitivity requirements of optical imaging and the delivery reliability needed for molecular targeting
2Measurement precision
If fluorescent semiconductor nanoparticles (Quantum Dots) are used for optical imaging, then high sensitivity can be achieved, but biocompatibility and stability issues arise
Solution Approach 1:
The patent transitions from semiconductor quantum dots to metal oxide nanoparticles, changing the material composition parameter to achieve better biocompatibility and stability. The metal oxide core provides MRI contrast while the polymer coating and fluorochrome conjugation maintain optical imaging sensitivity, thus improving biocompatibility without sacrificing imaging performance
Solution Approach 2:
By creating a composite structure with metal oxide core and polymer-fluorochrome coating, the patent achieves both the optical sensitivity needed for imaging and the biocompatibility required for in vivo stability, avoiding the toxicity issues associated with semiconductor quantum dots
3Adaptability or versatility
If multiple imaging modalities are combined, then both molecular and anatomical information can be obtained, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges MRI contrast agents (metal oxide nanoparticles) and optical imaging probes (fluorochrome-labeled particles) into a single unified nanoparticle platform. This consolidation allows simultaneous acquisition of both anatomical (MRI) and molecular (optical) information, achieving multi-modality imaging while simplifying the overall imaging protocol compared to using separate agents
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
These nanoparticles enable high-sensitivity, biocompatible, and stable imaging agents that can be used for various in vivo applications, enhancing the ability to detect and monitor diseases, assess drug efficacy, and provide molecular and anatomical information simultaneously.
Implementation Method 1
fluorescent metal oxide nanoparticles comprising: (a) a core comprising metal oxide; (b) a polymer coating chemically linked to the core; and (c) a plurality of fluorochromes chemically linked to the coating
Implementation Method 2
The fluorescent metal oxide nanoparticles may also have magnetic properties and, therefore, can be used for MRI
Data Source
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AI summary
The present invention provides fluorescent metal oxide nanopartic.es that are exceptionally fluorescent or have very high fluorescent brightness and can be used in a variety of in vitro and vivo applications. The fluorescent metal oxide nanσparticles are particularly useful as imaging agents that can be used for in vivo imaging. The fluorescent metal oxide nanoparticles may also have magnetic properties and, therefore, can be used for MRI, thus providing a multi-modality imaging agent. Specifically, the design of the agents of the present invention provide fluorescent metal oxide nanoparticles with one or more of the following features: (I) a polymer coating suitable for attaching a plurality of fhiorochromes thereby achieving large extinction coefficients (in excess of 1,000,000 M-1cm-1), (2) a non-crosslinked polymer coating suitable for attaching from about 10 to about 300 fluorochromes per particle, (3) a polymer coating suitable for attaching a plurality of fluorochromes in a manner that does not significantly compromise tht; quantum yield of the fluorochromes (e.g., the nanoparticles retain at least 50% of the fluorescent signal that is created by substantially the same number of free fluorochromes when tested under the same conditions), and (4) a polymer coating that is amenable to efficient chemical linking of biomolecules with retention of their biological properties to yield molecuSar imaging agents. The fluorescent metal oxide nanoparticles are highly stable molecular imaging agents in vitro, both before and after chemical Sinking of fluorochromes and biomolecules, but yet are labile and/or degradable in vivo.