AIM Polypeptide Top-Down Mass Spectrometry for Serum Quantification
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Solution Overview
Problem
Existing methods are inadequate for efficiently identifying and quantifying apoptosis inhibitor of macrophage (AIM) polypeptides in biological samples, particularly in serum, which are crucial for diagnosing and treating diseases like kidney disease and multiple myeloma, due to interference from human immunoglobulin chains and the need for additional instrumentation.
Innovation Solution
A method utilizing immunopurification with non-human antibodies, such as camelid antibodies, followed by top-down mass spectrometry techniques like ESI-Q-TOF MS, allows direct identification and quantification of AIM polypeptides bound to IgM immunoglobulins without fragmentation, enabling simultaneous detection of both.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If gel electrophoresis is used to detect AIM polypeptides, then the method is simple and widely available, but the resolution, speed, and quantification accuracy are insufficient
Solution Approach 1:
The patent replaces the mechanical separation system of gel electrophoresis with a mass spectrometry-based detection system. The top-down mass spectrometry technique directly measures the mass-to-charge ratio of intact AIM polypeptides, eliminating the need for physical separation through gels and providing superior quantification accuracy and speed without requiring complex sample preparation steps.
Solution Approach 2:
The patent changes the detection parameter from mobility-based separation (gel electrophoresis) to mass-to-charge ratio measurement (mass spectrometry). This parameter change enables direct detection and precise quantification of AIM polypeptides based on their molecular mass, achieving higher measurement precision while maintaining operational simplicity through standardized MS instrumentation.
2Reliability
If additional instrumentation specific to AIM polypeptides is used, then detection sensitivity and specificity improve, but device complexity and cost increase
Solution Approach 1:
The patent employs top-down mass spectrometry, a universal analytical technique that can detect and quantify multiple proteins simultaneously based on their mass-to-charge ratios. This multi-functional approach allows detection of AIM polypeptides without requiring AIM-specific instrumentation, achieving high detection sensitivity while using standard mass spectrometry equipment already available in many laboratories.
Solution Approach 2:
The mass spectrometry system inherently provides the necessary detection capabilities through its ability to measure mass-to-charge ratios of intact proteins. The technique self-distinguishes AIM polypeptides from other proteins based on their unique mass characteristics, eliminating the need for additional AIM-specific detection reagents or instrumentation while maintaining high reliability.
3Measurement precision
If AIM polypeptides are detected in complex serum samples, then clinical diagnostic value increases, but interference from immunoglobulin chains reduces detection accuracy
Solution Approach 1:
The patent extracts and identifies AIM polypeptides from complex serum samples based on their unique mass-to-charge ratio signatures detected by mass spectrometry. The top-down approach directly measures intact AIM polypeptides, separating them from interfering immunoglobulin chains through mass differentiation rather than physical separation, thereby achieving accurate detection in complex biological matrices.
Solution Approach 2:
The mass spectrometry detection focuses on the specific local property of AIM polypeptides - their unique molecular mass and mass-to-charge ratio. By targeting this specific characteristic, the method achieves high detection accuracy in complex serum samples, distinguishing AIM polypeptides from other proteins including immunoglobulin chains based on their local mass properties rather than requiring global sample separation.
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 provides a sensitive and specific method for diagnosing and monitoring diseases by accurately quantifying AIM polypeptides, offering superior resolution and speed compared to gel electrophoresis, and facilitating treatment monitoring.
Implementation Method 1
immunopurifying IgM immunoglobulins from the sample, wherein said immunopurifying comprises using an anti-IgM antibody, wherein said anti-IgM antibody is an anti-human antibody and wherein AIM polypeptides bound to IgM immunoglobulins are released from the IgM immunoglobulins
Implementation Method 2
subjecting the immunopurified immunoglobulins to a top-down mass spectrometry technique to obtain a mass spectrum of the sample... The mass spectrometry technique can be electrospray ionization mass spectrometry (ESI-MS)
Implementation Method 3
The ESI-MS technique can include quadrupole time-of-flight (TOF) mass spectrometer
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
This document provides materials and methods for identifying and quantifying AIM polypeptides in a sample using mass spectrometry techniques. For example, methods of using mass spectrometry to identify and quantify AIM polypeptides in a serum sample are provided. In some cases, quantification of AIM polypeptides can be used to diagnose and/or treat patients having a disease or disorder characterized by altered (e.g., increased or decreased) AIM polypeptide levels.