Folate-Targeted PET Tracers for Bacterial Infection Imaging
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Solution Overview
Problem
Current diagnostic methods for bacterial infections are hindered by unsophisticated and often inaccurate techniques, particularly in differentiating between infection and inflammation, and existing PET tracers like FDG lack specificity due to non-specific uptake by cells with high glycolytic activity.
Innovation Solution
Development of two bacteria-specific PET tracers, Ethyl 2-[18F]F-4-Nitrobenzoate (2-[18F]F-ENB) and 2-[18F]F-4-Nitrobenzoate (2-[18F]F-NB), which target the folate pathway in bacteria, allowing for specific imaging of Staphylococcus aureus infections by incorporating into the bacterial folate biosynthesis pathway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If FDG is used as a PET tracer for infection detection, then the tracer can detect areas of high glycolytic activity, but it lacks specificity because it is taken up by both bacterial cells and human inflammatory cells
Solution Approach 1:
The patent applies local quality by designing a tracer with specific biochemical properties that enable selective uptake by bacterial cells while being excluded from human cells. The folate analog structure with specific chemical groups allows bacterial folate pathway enzymes to recognize and transport it, while human cells lack this specific transport mechanism, creating localized specificity at the bacterial cell level
Solution Approach 2:
The patent changes the chemical parameters of the tracer from glucose-based (FDG) to folate-based structure. This parameter change includes modifying the molecular structure to contain folate pathway-specific functional groups, which fundamentally alters the biological recognition and uptake mechanism, enabling specificity for bacterial cells over human inflammatory cells
2Measurement precision
If novel infection tracers like FIAU, FDS, or maltose-based molecules are used, then bacterial specificity may be improved, but they face limitations such as low signal-to-background ratio, low radiochemical yield, or lack of uptake by S. aureus
Solution Approach 1:
The patent optimizes the chemical parameters of the folate analog tracer, specifically adjusting the molecular structure to enhance affinity for bacterial folate pathway enzymes. The structure includes specific substituents and functional groups that maximize bacterial uptake while minimizing non-specific background signal, achieving high signal-to-background ratio through precise chemical parameter optimization
Solution Approach 2:
The patent creates a synthetic analog that copies the essential structural features of natural folate molecules that bacteria recognize and utilize. By replicating the key folate pathway recognition elements, the tracer mimics natural bacterial substrates, ensuring high-specificity uptake by S. aureus and other bacteria while maintaining excellent signal-to-background characteristics
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 tracers effectively differentiate between bacterial infections and inflammatory responses, providing high signal-to-background ratios and enabling accurate localization and quantification of bacterial burdens, thus improving diagnostic accuracy and treatment monitoring.
Implementation Method 1
These tracers effectively differentiate between bacterial infections and inflammatory responses, providing high signal-to-background ratios and enabling accurate localization and quantification of bacterial burdens
Implementation Method 2
Positron emission tomography (PET) is a promising non-invasive imaging technique for detecting and localizing infection in humans
Data Source
AI summary
This invention provides a composition comprising the compound having the structure:ethyl 2-[19F]F-4-nitrobenzoate, and at least one acceptable carrier.This invention also provides a method of detecting the presence of or location of bacteria cells in a subject which comprises determining if an amount of the compound or determining where an amount of the compound having the structure:is present in the subject at a period of time after administration of the compound or salt thereof to the subject, thereby detecting the presence of or location of the bacteria cells based on the amount of the compound determined to be present in the subject or detecting the location of the bacteria cells based on the location of the compound determined to be present in the subject.