Decrosslinking Formalin-Fixed Tissue for Mass Spectrometry
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Solution Overview
Problem
Current methods for diagnosing and analyzing biological samples, particularly those from formalin-fixed paraffin-embedded tissues, face challenges due to chemical fixation and paraffin embedding, which denature proteins and limit the applicability of mass spectrometry, making it difficult to identify and quantify molecular markers for disease diagnosis and drug discovery.
Innovation Solution
A method involving antigen retrieval to decrosslink chemically fixed proteins, followed by mass spectrometry analysis, allows for the identification and quantification of proteins in paraffin-embedded tissues, enabling the analysis of formalin-fixed, paraffin-embedded samples, including tissue microarrays, and forming a classification model to differentiate between biological statuses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If formalin fixation and paraffin embedding are used to preserve tissue samples for histological examination, then specimen preservation and morphological integrity are improved, but protein tertiary structure is denatured and mass spectrometry analysis becomes limited or impossible
Solution Approach 1:
The patent applies preliminary decrosslinking treatment to formalin-fixed paraffin-embedded tissue sections before mass spectrometry analysis. This preliminary action reverses the formalin-induced crosslinking by treating the sections with decrosslinking agents (such as hydroxylamine or borane), thereby restoring protein accessibility and enabling subsequent mass spectrometry analysis without compromising the preserved morphological integrity of the tissue samples.
2Reliability
If chemical fixation with formalin is used to preserve tissue, then specimen stability is improved, but protein denaturation occurs and molecular marker identification becomes difficult
Solution Approach 1:
The patent extracts molecular information from formalin-fixed paraffin-embedded tissue sections by applying decrosslinking treatment. This process removes the formalin-induced crosslinks that obscure molecular markers, allowing mass spectrometry to detect and identify proteins and other molecules within the preserved tissue architecture. The decrosslinking step effectively extracts the molecular signal that was trapped by the fixation process.
3Ease of operation
If standard histological methods are used for tissue analysis, then morphological examination is maintained, but proteomic information and molecular marker discovery are limited
Solution Approach 1:
The patent makes formalin-fixed paraffin-embedded tissue sections universally applicable to multiple analytical methods. By combining standard histological preparation with decrosslinking treatment, the same tissue sections can be used for both traditional morphological examination and modern proteomic analysis via mass spectrometry. This multi-functional approach allows simultaneous preservation of morphological integrity and recovery of proteomic information from the same sample.
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 unlocks previously untapped proteomic information, enabling the simultaneous identification of multiple proteins and improving the diagnosis and drug target identification by overcoming the limitations of standard histological methods, thereby enhancing the accuracy of disease diagnosis and treatment.
Implementation Method 1
a mass spectrum can be generated
Implementation Method 2
the average intensity of the generated signals at the mass-to-charge ratio A
Data Source
AI summary
A method of analyzing cellular samples that include a chemically crosslinked analyte is provided. The analysis typically involves the use of mass spectrometry.