Cyclodextrin Dimers for Selective 7KC Removal
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Solution Overview
Problem
7-ketocholesterol (7KC), a non-enzymatically produced oxysterol, is toxic and contributes to various diseases, including atherosclerosis, by enhancing free radical production and disrupting cellular functions, with existing methods lacking effective targeting and removal strategies.
Innovation Solution
Design and testing of cyclodextrin (CD) dimers, specifically heterodimers, homodimers, and asymmetric dimers with varying substitution groups, to selectively target and solubilize 7KC, enhancing binding affinity and specificity, thereby facilitating its removal from biological systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods are used to remove cholesterol, then cholesterol levels are reduced, but 7KC is not selectively targeted and harmful cholesterol removal occurs
Solution Approach 1:
The cyclodextrin dimers are designed with specific structural characteristics (cavity size, substitution groups) that provide selective binding properties. The heterodimers combine αCD and βCD units with different cavity dimensions, allowing one unit to bind the 7KC carbonyl group while the other binds the steroid nucleus, creating a highly specific recognition pattern that distinguishes 7KC from cholesterol and other sterols.
Solution Approach 2:
The patent employs asymmetric dimer structures where the two cyclodextrin units are different (heterodimers) or positioned asymmetrically. This asymmetry allows the dimer to recognize and bind the asymmetric structure of 7KC specifically, with one CD unit interacting with the carbonyl group and the other with the steroid nucleus, thereby achieving selective targeting over symmetric cholesterol molecules.
2Reliability
If monomeric cyclodextrins are used, then simple structures are maintained, but binding affinity and specificity for 7KC are insufficient
Solution Approach 1:
The patent combines two cyclodextrin units into a dimer structure linked by a connecting group. This merging allows the dimer to simultaneously interact with two distinct parts of the 7KC molecule (carbonyl group and steroid nucleus), thereby achieving higher binding affinity and specificity than monomeric cyclodextrins could provide alone.
Solution Approach 2:
The cyclodextrin dimers form inclusion complexes where the 7KC molecule is nested within the hydrophobic cavities of the cyclodextrin units. The carbonyl group of 7KC is accommodated in one CD cavity while the steroid nucleus is nested in the other, creating a stable host-guest complex with high binding affinity.
3Productivity
If high concentrations of cholesterol removal agents are used, then cholesterol is effectively removed, but toxic effects increase and harmful cholesterol is also removed
Solution Approach 1:
The patent modifies the parameters of cyclodextrin structures by creating dimers with specific cavity sizes, substitution groups (hydroxyl, alkoxy, halogen, nitro, cyano), and linking groups. These parameter changes enhance the selectivity and binding affinity for 7KC, allowing effective removal at lower concentrations without the toxic effects associated with high-dose conventional treatments.
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 CD dimers effectively solubilize and remove 7KC, reducing its toxic effects, and show promise in treating or preventing associated diseases such as atherosclerosis and age-related conditions by preferentially targeting 7KC over cholesterol, minimizing harmful cholesterol removal.
Implementation Method 1
two βCDs can be covalently linked in a head-to-head fashion to significantly improve their ability to form inclusion complexes with target molecules such as 7KC
Data Source
AI summary
CD dimers, CD compositions, and uses thereof are disclosed herein.