Sialic Acid-Sensing Metal Complexes for Selective Cancer Cell Imaging
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Solution Overview
Problem
Current methods for detecting sialic acids and polysialic acids in biological samples suffer from low selectivity and high false-positive rates due to non-specific binding interactions, limiting their effectiveness in differentiating cancer cells from normal cells and assessing the efficacy of inhibitors for therapeutic interventions.
Innovation Solution
Development of d8 and d10 metal complexes with specific coordination modes and functional groups that facilitate supramolecular self-assembly and aggregation upon binding to sialic acids and polysialic acids, utilizing noncovalent interactions such as electrostatic, hydrogen bonding, and π-π stacking to induce photophysical changes for sensitive and selective detection and imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phenylboronic acid (PBA) moiety is used to detect sialic acids, then detection capability is provided, but selectivity is low due to binding with other monosaccharides causing false positives
Solution Approach 1:
The patent combines phenylboronic acid (PBA) with cationic porphyrin to create a composite sensing system. The PBA provides sialic acid binding capability while the cationic porphyrin component enhances selectivity through electrostatic interactions with the negatively charged sialic acid residues, reducing false positive binding with other monosaccharides.
Solution Approach 2:
The patent introduces specific functional groups (carboxylate, sulfonate, phosphonate) at particular positions on the porphyrin molecule to create localized regions of enhanced negative charge density that specifically interact with sialic acid's unique structural features, thereby improving selectivity at the molecular recognition site.
2Measurement precision
If conventional detection methods are used, then detection of sialic acids is achieved, but false-positive results occur due to minute amounts of sialic acids on normal cell surfaces
Solution Approach 1:
The patent merges multiple recognition mechanisms into a single probe system: PBA's covalent ester formation with sialic acid, cationic porphyrin's electrostatic attraction to negatively charged sialic acid, and the cooperative effect of these interactions to achieve high-specificity detection that distinguishes cancer cells with high sialic acid expression from normal cells with low levels.
3Measurement precision
If supramolecular self-assembly is utilized for detection, then sensitivity and selectivity are improved, but device complexity increases
Solution Approach 1:
The patent employs self-assembling probe molecules that automatically organize into functional supramolecular structures through non-covalent interactions (hydrogen bonding, π-π stacking, electrostatic interactions) without requiring external assembly machinery or complex processing steps, thereby achieving high detection accuracy while maintaining relatively simple system architecture.
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 metal complexes provide high specificity and sensitivity for detecting sialic acids and polysialic acids, enabling accurate differentiation of cancer cells from normal cells and evaluating the effectiveness of inhibitors, with luminescence signals in the red to near-infrared region, reducing interference from autofluorescence.
Implementation Method 1
utilizing noncovalent interactions such as electrostatic, hydrogen bonding, and π-π stacking to induce photophysical changes
Implementation Method 2
utilizing noncovalent interactions such as electrostatic, hydrogen bonding, and π-π stacking to induce photophysical changes
Implementation Method 3
utilizing noncovalent interactions such as electrostatic, hydrogen bonding, and π-π stacking to induce photophysical changes
Implementation Method 4
facilitate supramolecular self-assembly and aggregation upon binding to sialic acids and polysialic acids
Implementation Method 5
with luminescence signals in the red to near-infrared region
Data Source
AI summary
Compounds, particularly compounds capable of sensing and/or imaging glycans (such as sialic acids, e.g., mono-sialic acids, disialosides, trisialosides, polysialic acids), and/or cancer cells, and differentiating cancer cells from normal cells, are disclosed. The compounds are d8 or d10 metal complexes or salts thereof. The metal complexes can bind to glycans (such as sialic acids, e.g., mono-sialic acids, disialosides, trisialosides, polysialic acids), and/or cancer cells. The binding interaction induces accumulation and supramolecular self-assembly of the metal complexes, thereby causing changes in the photophysical properties of the metal complexes.