Lectin-Based Exosome Quantification via Carbohydrate Binding
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Solution Overview
Problem
Current methods lack a reliable and efficient way to quantify exosomes from various cell types, which is crucial for diagnosing and prognosing cancers and infectious diseases, as existing assays are limited by the need for specific antibodies and are not broadly applicable.
Innovation Solution
A method utilizing lectins such as Galanthus nivalis lectin (GNA), Narcissus pseudonarcissus lectin (NPA), Allium sativum lectin (ASA), Lens culinaris lectin (LCH), Sambucus nigra lectin (SNA), Maackia amurensis lectin (MAL), and concanavalin A immobilized on a substrate to capture and detect exosomes, enabling quantification through a detectable exosome-binding agent and comparison to a standard curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antibody-based methods are used to detect exosomes, then detection specificity is improved, but applicability to multiple cell types deteriorates
Solution Approach 1:
The patent applies universality by using lectins that can bind to carbohydrate structures common to exosomes from multiple cell types including cancer cells, normal cells, and infectious disease sources. This single lectin-based platform replaces the need for multiple different antibodies, making the detection method universally applicable across diverse exosome sources while maintaining reliable detection through specific lectin-carbohydrate binding.
2Adaptability or versatility
If lectin-based methods are used to detect exosomes, then applicability to multiple cell types is improved, but detection sensitivity deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing several critical parameters: (1) lectin concentration and immobilization density on the substrate, (2) incubation time and temperature conditions, (3) detectable agent labeling density, and (4) signal amplification parameters. These optimized parameters enable the lectin-based method to achieve detection sensitivity of at least 1 x 10^7/ml while maintaining broad applicability to multiple cell types.
3Ease of manufacture
If size chromatography and general protein assay are used to characterize exosomes, then purification is improved, but quantification reliability deteriorates
Solution Approach 1:
The patent introduces an intermediary detection system that bridges purification and quantification. The lectin acts as a mediator that specifically binds to exosomes regardless of their source, and the detectable exosome-binding agent serves as an intermediary that converts the binding event into a measurable signal. This intermediary detection system provides reliable quantification that correlates with actual exosome presence, overcoming the limitations of general protein assays that cannot specifically quantify exosomes.
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 method allows for sensitive detection of exosomes at concentrations as low as 1 x 10^7/ml, applicable to exosomes from multiple cell types, including cancer and infectious disease sources, providing a broad spectrum of detection across different biological samples.
Implementation Method 1
contacting the sample with lectin immobilized on a substrate; contacting exosomes bound to the lectin
Data Source
AI summary
Embodiments of the present invention relate to methods, compositions and kits for quantifying exosomes. In particular, methods, composition and kits that utilize lectins to quantify exosomes are provided.