Protein Extraction from Formalin-Fixed Tissue via Thermal Buffer Incubation
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Solution Overview
Problem
Current methods fail to reliably and quantitatively extract intact proteins from formalin-fixed tissues due to protein cross-linking, resulting in poor protein yield and limited quantification capabilities, making them unsuitable for clinical and research applications, especially for high-throughput methods like protein arrays.
Innovation Solution
A method involving incubation of formalin-fixed biological samples in a detergent-containing buffer without proteolytically active compounds, followed by boiling and further heating above 60°C, which effectively releases intact proteins for quantitative extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If formalin fixation is used to preserve tissue morphology, then tissue morphology is well preserved, but protein cross-linking occurs which prevents adequate protein extraction and quantification
Solution Approach 1:
The patent applies parameter changes by utilizing heat treatment at specific temperatures (100°C for 10 minutes followed by 60°C for 2 hours) to alter the physical state of formalin-crosslinked proteins. This thermal processing breaks the cross-links while preserving the morphological integrity of the tissue, thereby enabling protein extraction without compromising the fixed morphology.
Solution Approach 2:
The patent uses a buffer system containing detergent as an intermediary medium to facilitate protein extraction. The buffer contains detergent that helps solubilize proteins while the buffer system itself acts as a mediator between the heat treatment and the protein extraction process, enabling intact protein recovery from formalin-fixed tissues.
2Quantity of substance
If proteases are used to digest proteins, then protein extraction is enabled, but protein integrity is lost due to digestion into peptides
Solution Approach 1:
The patent converts the harmful effect of formalin cross-linking into a beneficial process by using controlled heat treatment to break the cross-links. Instead of using proteases that would destroy protein integrity, the heat treatment selectively breaks the formalin cross-links while preserving the native protein structure, thereby obtaining intact proteins for quantification.
Solution Approach 2:
The patent replaces the chemical mechanism of protease digestion with a physical mechanism of heat treatment. Instead of using enzymatic breakdown that destroys protein integrity, the patent uses thermal energy to break formalin cross-links, thereby extracting proteins while maintaining their structural integrity and functionality.
3Quantity of substance
If high temperature heating is applied to break cross-links, then protein extraction is improved, but protein denaturation may occur
Solution Approach 1:
The patent employs periodic action by applying heat treatment in two distinct stages: first at 100°C for 10 minutes to initiate cross-link breakdown, then at 60°C for 2 hours to complete the extraction process. This staged thermal processing effectively breaks formalin cross-links while avoiding excessive temperature exposure that would cause protein denaturation.
Solution Approach 2:
The patent utilizes parameter changes by optimizing temperature and time parameters in a controlled sequence. The initial high temperature (100°C) for a short duration (10 minutes) followed by a lower temperature (60°C) for a longer duration (2 hours) creates optimal conditions for cross-link breakdown while preserving protein structure and preventing denaturation.
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 significantly improves protein yield and integrity, enabling accurate quantification and detection of intact proteins, compatible with high-throughput methods like protein arrays, and enhances clinical and research applications by providing a reliable source for disease marker analysis.
Implementation Method 1
the biological sample is first boiled in the buffer and then further incubated at a temperature higher than 60 ° C
Implementation Method 2
Formalin-fixed and Paraffin Embedded (FFPE) tissue has been collected for decades... the cross-linking
Data Source
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AI summary
The invention relates to a method with which proteins from formalin-fixed biological samples can be dissolved and subsequently quantified. The method makes it possible to extract intact full-length proteins from the samples and to conduct a subsequent analysis thereof.