CA IX-Targeted NIR Dyes for Hypoxic Tumor Imaging
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Solution Overview
Problem
Current methods for targeting carbonic anhydrase IX (CA IX) in cancer therapy face challenges such as non-specific inhibition and poor membrane permeability, leading to off-target effects and reduced efficacy in treating hypoxic tumors.
Innovation Solution
Development of CA IX-targeted near-infrared (NIR) dyes conjugated with specific ligands and linkers that enhance binding affinity and specificity, allowing for improved imaging and therapeutic delivery to CA IX-expressing tissues, including tumors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional CA IX targeting methods are used, then CA IX binding is achieved, but non-specific inhibition and off-target effects occur
Solution Approach 1:
The patent applies local quality by designing ligands with specific molecular features (hydrophobic groups, sulfonamide moieties) that selectively interact with the local active site environment of CA IX. The ligands are engineered to exploit the unique hydrophobic pocket and zinc coordination geometry of CA IX, achieving selective binding while avoiding off-target effects on other carbonic anhydrase isoforms.
Solution Approach 2:
The patent employs parameter changes by modifying ligand structure parameters including adding hydrophobic groups (phenyl, naphthyl, cyclohexyl moieties), optimizing the distance between the sulfonamide zinc-binding group and hydrophobic interactions, and adjusting molecular geometry to achieve optimal fit in the CA IX active site. These parameter optimizations enhance binding affinity and selectivity for CA IX over other isoforms.
2Reliability
If conventional CA IX targeting methods are used, then CA IX binding is achieved, but membrane permeability is poor
Solution Approach 1:
The patent applies parameter changes by systematically modifying ligand hydrophobicity parameters through incorporation of aromatic and cyclic hydrophobic groups. These structural parameter changes increase lipid membrane solubility and facilitate passive diffusion across cell membranes, thereby improving intracellular delivery while maintaining CA IX binding affinity through the sulfonamide zinc-coordination mechanism.
Solution Approach 2:
The patent employs composite material design by combining the hydrophilic sulfonamide zinc-binding group with hydrophobic aromatic and cyclic moieties in a single ligand molecule. This composite structure enables the ligand to simultaneously interact with the hydrophobic protein environment of CA IX and permeate lipid membranes, resolving the contradiction between binding affinity and membrane permeability.
3Measurement precision
If CA IX-targeted NIR dyes are used, then tumor imaging is improved, but background signal increases
Solution Approach 1:
The patent applies local quality by designing NIR dye conjugates with ligands that specifically target the CA IX active site. The localized binding to CA IX-expressing tumor cells provides specific signal accumulation at the tumor site, while unbound dye is rapidly cleared from circulation. This specific localization improves tumor-to-background ratio by concentrating the imaging signal at the target site and minimizing diffuse background signal.
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 CA IX-targeted NIR dyes provide enhanced tumor-to-background ratios, deep tissue penetration, and specific fluorescence, facilitating precise imaging and surgical removal of tumors while minimizing off-target effects.
Implementation Method 1
CA IX-targeted ligands...enhance binding affinity and specificity, allowing for improved imaging and therapeutic delivery to CA IX-expressing tissues
Implementation Method 2
CA IX-targeted near-infrared (NIR) dyes...deep tissue penetration
Implementation Method 3
specific fluorescence, facilitating precise imaging
Data Source
AI summary
The present disclosure relates to compounds that are useful as near-infrared fluorescence probes, wherein the compounds include i) a ligand that binds to the active site of carbonic anhydrase, ii) a dye molecule, and iii) a linker molecule that comprises an amino acid, amide, ureido, or polyethylene glycol derivative thereof. The disclosure further describes methods and compositions for making and using the compounds, methods incorporating the compounds, and kits incorporating the compounds.