Exosomal KL-6 Detection Kit for Interstitial Lung Disease Diagnosis
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Solution Overview
Problem
Current diagnostic methods for interstitial lung disease (ILD) face challenges with low sensitivity and specificity due to the detection of KL-6 protein in serum, which is influenced by free KL-6 protein and other interferents, necessitating a more accurate and specific serological marker.
Innovation Solution
A kit and method for detecting KL-6 protein on exosomes, combined with CA125, which uses specific antibodies and a sample treatment solution to isolate and quantify these proteins, providing higher specificity and sensitivity for diagnosing ILD by reducing interference from free KL-6 and other serum components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If KL-6 protein in serum is used as a diagnostic marker for interstitial lung disease, then the diagnostic method is simple and widely applicable, but the sensitivity and specificity are insufficient due to interference from free KL-6 protein and other serum components
Solution Approach 1:
The invention segments the detection target from total KL-6 in serum to specifically KL-6 on exosomes. By isolating exosomes as a separate detectable entity, the method distinguishes pathogenic KL-6 (on exosomes from type II alveolar epithelial cells) from non-pathogenic free KL-6 in serum, thereby improving diagnostic precision without requiring overly complex procedures
Solution Approach 2:
The invention uses exosomes as an intermediary carrier to deliver KL-6 protein information. Exosomes naturally transport membrane proteins like KL-6 from damaged type II alveolar epithelial cells into the circulation, serving as a protective and informative vehicle that allows specific detection of lung injury markers while filtering out interfering free protein in serum
2Measurement precision
If KL-6 protein on exosomes is detected to improve diagnostic accuracy, then sensitivity and specificity increase, but the detection method becomes more complex requiring exosome isolation and specific assays
Solution Approach 1:
The invention performs preliminary isolation of exosomes from serum before KL-6 detection. By pre-separating exosomes using established methods (ultracentrifugation, size-exclusion chromatography, or precipitation), the complex task of specific detection is simplified, as subsequent KL-6 measurement only needs to distinguish exosomal from non-exosomal protein, which is achieved through antibody-based specificity
Solution Approach 2:
The invention leverages universal exosome isolation methods that can be adapted from existing protocols in other fields (cancer biomarkers, cardiovascular disease) to interstitial lung disease detection. The same exosome isolation techniques used in oncology and cardiology can be applied here, reducing the need for entirely new complex procedures while maintaining diagnostic accuracy
3Ease of operation
If free KL-6 protein in serum is detected, then the test is quick and easy to perform, but the results are confounded by presence of free KL-6 in both healthy and diseased individuals reducing specificity
Solution Approach 1:
The invention extracts KL-6 specifically from exosomes and separates it from free KL-6 in serum. By physically isolating exosomes through centrifugation or chromatography, the method removes the confounding free protein fraction, allowing detection to focus solely on exosomal KL-6 which is elevated specifically in interstitial lung disease and not in healthy individuals
Solution Approach 2:
Instead of detecting total KL-6 and trying to subtract background noise from free protein, the invention inverts the approach by directly detecting only the exosomal fraction. This reverse strategy—detecting what is specifically present (exosomal KL-6) rather than what is generally present (total KL-6)—eliminates the need to account for interfering free protein and dramatically improves specificity
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 method effectively diagnoses ILD with improved sensitivity and specificity, enabling early detection of fibrotic progression and timely treatment, and allows for full-automatic detection of proteins on exosomes with reduced detection time and increased signal-to-noise ratio.
Implementation Method 1
uses specific antibodies and a sample treatment solution to isolate and quantify these proteins
Data Source
AI summary
The present application discloses a detection kit of KL-6 protein on exosomes for auxiliary diagnosis of interstitial lung diseases. A detection method includes: after pretreating the exosome sample with a sample treatment solution, exosomes containing KL-6 protein in the sample react with a coated magnetic bead working solution and a luminescent marker-labeled antibody working solution to form an immunocomplex, and a luminous intensity is detected by using a chemiluminescence method and a concentration value is calculated. The application provides, for the first time, a method for diagnosing interstitial pneumonia using a combination of KL-6 and CA125 proteins on exosomes extracted from blood, or using KL-6 alone.