Metal Chelating Agents for Vascular Calcification Detection
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Solution Overview
Problem
Current imaging modalities cannot directly detect vascular calcification, a significant risk factor for myocardial infarction, despite its association with cardiovascular disease, which is the leading cause of death worldwide.
Innovation Solution
Development of a compound comprising a metal chelating moiety covalently linked to a phosphate moiety, coordinated with a +4 oxidation state metal nuclide, specifically a triaza, tetraaza, hexaaza, or octaaza chelating moiety with carboxyl groups, for use in detecting vascular calcification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging modalities (ultrasound, CT, MRI, PET) are used, then cardiovascular disease can be diagnosed, but vascular calcification cannot be directly detected
Solution Approach 1:
The patent introduces a molecular probe as an intermediary agent that specifically binds to vascular calcification deposits. This probe contains a phosphate group that targets calcium in calcification, a chelating moiety that binds metal ions, and a radiolabel that provides detectable signal. The probe acts as a mediator between the imaging system and the calcification, enabling direct detection without relying on conventional modalities' indirect detection methods.
Solution Approach 2:
The molecular probe is a composite structure combining multiple functional components: a phosphate targeting group, a metal chelating moiety (such as DOTA or NOTA), and a radiolabel (such as 68Ga or 64Cu). This composite design integrates targeting, binding, and detection functions into a single molecule, allowing specific and sensitive detection of vascular calcification.
2Measurement precision
If DOTA-alendronate complexes radiolabeled with 68Ga are used for PET imaging, then bone calcification can be detected, but vascular calcification shows no uptake
Solution Approach 1:
The patent modifies the molecular structure to create local quality differences that favor vascular calcification targeting. The probe uses a phosphate group with specific chemical properties that preferentially bind to the mineral composition of vascular calcification rather than bone. The chelating moiety and radiolabel combination is optimized for vascular tissue characteristics, creating local chemical environment specificity that enables selective uptake in the vascular system while maintaining high detection precision.
3Measurement precision
If a metal chelating moiety with carboxyl groups is coordinated to a +4 oxidation state metal nuclide, then direct detection of vascular calcification is enabled
Solution Approach 1:
The molecular probe is designed with universal functionality that addresses multiple requirements simultaneously. The phosphate group provides universal targeting capability for calcium deposits, the chelating moiety (DOTA, NOTA, or similar) provides universal metal ion binding for various radiolabels, and the radiolabel provides universal detectable signal. This multi-functional design enables direct detection of vascular calcification while maintaining reasonable structural complexity through standardized modular components.
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
Enables direct detection of vascular calcification, providing a diagnostic tool to assess risk and monitor cardiovascular health effectively.
Implementation Method 1
a metal chelating moiety coordinated to a metal nuclide in a +4 oxidation state
Implementation Method 2
DOTA-alendronate complexes radiolabeled with 68Ga are excellent PET imaging agents
Data Source
AI summary
Provided herein, inter alia, are methods and compositions for detection of vascular calcification.