Modified Retinol Binding Protein Assay for Liposome Stability
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Solution Overview
Problem
Current methods for monitoring the bioperformance of vitamin A-conjugated lipid nanoparticles (LNPs), such as DiVA-PEG-DiVA, are hindered by sensitivity to UV and white light, leading to isomerization and chain oxidation, and existing assays like ELISA, SPR, and Western blot face non-specific signals due to the inherent properties of these nanoparticles.
Innovation Solution
A method involving a modified retinol binding protein (RBP) associated with an immobilized surface, where the RBP binds to a retinoid or fat-soluble vitamin on the LNP surface, using a sandwich immunoassay format with streptavidin-coated plates and ECL detection, to measure the relative RBP-binding affinity and stability of LNPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If ELISA, SPR, or Western blot methods are used to monitor LNP bioperformance, then general detection capability is provided, but non-specific signals occur due to intrinsic LNP properties
Solution Approach 1:
The patent introduces a modified retinol binding protein (RBP) as an intermediary that specifically binds to retinoid conjugates on LNP surfaces. This RBP acts as a mediator between the LNP and the detection system, enabling specific recognition of the targeting moiety while avoiding non-specific signals from LNP components. The modified RBP is then detected using sandwich ELISA with anti-RBP antibodies, providing signal specificity.
Solution Approach 2:
The patent modifies the RBP by conjugating it to a detectable label (such as biotin or fluorescent tags) and immobilizing it on surfaces for SPR detection. These parameter changes enable the RBP to serve as a specific detection probe that transforms the binding event into a measurable signal while maintaining specificity for retinoid-conjugated LNPs.
2Reliability
If Vitamin A-conjugated targeting agents are used on LNP surfaces, then targeting ability to HSCs is enhanced, but sensitivity to UV and white light causes isomerization and chain oxidation
Solution Approach 1:
The patent performs preliminary characterization of the LNP's targeting moiety binding affinity to RBP before in vivo administration. This preliminary assessment allows determination of whether the targeting agent has maintained its binding capability despite light exposure, enabling prediction of in vivo targeting performance without actually administering potentially degraded material.
Solution Approach 2:
The patent implements a feedback mechanism where the binding affinity of the targeting moiety to RBP is measured using the modified RBP assay. This feedback information about targeting agent integrity is used to assess LNP quality and predict in vivo performance, allowing for quality control decisions about whether the LNP batch is suitable for administration.
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
This approach effectively assesses the binding affinity and stability of LNPs, providing accurate and specific measurements of their bioperformance, even in the presence of light exposure, and maintains the integrity of the nanoparticles, ensuring reliable targeting ability.
Implementation Method 1
wherein the modified RBP binds the retinoid or the fat-soluble vitamin
Implementation Method 2
using a sandwich immunoassay format with streptavidin-coated plates
Implementation Method 3
ECL detection
Data Source
AI summary
The disclosure provides a method of measuring the relative RBP-binding affinity of a liposome in a sample. In some aspects, the method comprises contacting the sample with a modified RBP associated with an immobilized surface, wherein an exterior surface of the liposome comprises a retinoid or a fat-soluble vitamin, and wherein the modified RBP binds the retinoid or the fat-soluble vitamin.