Amphipathic PEG-Cholesterol Compounds for Quantitative Cell Immobilization
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Solution Overview
Problem
Current methods for cell immobilization and stabilization are not quantitative, cell-type independent, and suffer from cell loss due to internalization or rejection of linker molecules, with monovalent shear protective agents like cholesterol having limitations in concentration and stability.
Innovation Solution
Development of compounds with multiple hydrophobic domains covalently bound to a hydrophilic PEG moiety, which anchor into cell membranes, providing stable and quantitative cell immobilization and stabilization without affecting cell viability, using compounds like Cholesteryl-TEG-Cholesteryl-PEG2000-Fluos for enhanced binding and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monovalent shear protective agents like cholesterol are used to stabilize cells, then cell stability under shear stress is improved, but the concentration required is high and cell loss occurs due to internalization or rejection
Solution Approach 1:
The patent uses composite amphipathic molecules combining hydrophobic domains (cholesterol, fatty acids) with hydrophilic PEG domains. This composite structure allows the molecule to simultaneously interact with lipid membranes (via hydrophobic domains) and aqueous environments (via PEG domains), providing effective cell stabilization at lower concentrations without the drawbacks of monovalent agents.
Solution Approach 2:
The amphipathic molecules are segmented into distinct hydrophobic and hydrophilic domains. The hydrophobic domains (cholesterol, fatty acid chains) anchor into lipid membranes while the hydrophilic PEG domains extend into the aqueous environment, creating a segmented structure that provides both membrane interaction and steric stabilization, reducing cell loss.
2Ease of operation
If linker molecules are used for cell immobilization, then cells can be attached to surfaces, but the binding is not tight enough for subsequent processing steps like immunochemical staining and washing
Solution Approach 1:
The patent changes the key parameter of binding strength by using amphipathic molecules with multiple hydrophobic domains that can insert into cell membranes. This creates much stronger anchoring compared to conventional linker molecules, providing binding strength sufficient for subsequent processing steps while maintaining ease of operation.
3Productivity
If conventional immobilization compounds are used, then cells can be immobilized on surfaces, but the immobilization is not quantitative and is not cell-type independent
Solution Approach 1:
The amphipathic molecules possess universal applicability across different cell types due to their ability to interact with lipid membranes, which are common to all cells. The hydrophobic domains can insert into any lipid bilayer, making the immobilization method quantitative and cell-type independent, achieving both high productivity and adaptability.
4Reliability
If higher concentrations of monovalent protective agents are used to achieve stabilization, then more cells are protected, but the side effects and cell loss increase
Solution Approach 1:
The patent changes the concentration parameter by using amphipathic molecules that are more effective at lower concentrations. The combination of hydrophobic membrane anchoring and hydrophilic steric stabilization creates a more efficient protective mechanism, achieving the same shear protection with lower concentrations, thereby reducing side effects and cell loss.
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 compounds achieve strong, quantitative cell immobilization and stabilization, reducing cell loss and internalization, with lower concentrations required due to cooperative binding effects, and maintaining cell viability and morphology.
Implementation Method 1
one or more hydrophobic domains, wherein the one or more hydrophobic domains each comprise a linear lipid, a steroid or a hydrophobic vitamin
Implementation Method 2
a hydrophilic domain comprising PEG moieties
Data Source
AI summary
The present invention relates to novel compounds comprising one or more hydrophobic domains and a hydrophilic domain comprising PEG moieties, useful for binding cells, as well as uses and compositions related thereto. The compounds are useful for immobilizing and/or stabilizing cells.