Mass-Tag SIMS Tissue Imaging for High-Plex Antigen Detection
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Solution Overview
Problem
Conventional immunohistochemistry (IHC) methods face limitations in detecting multiple antigens simultaneously due to non-linear staining and the need for specific primary antibodies and reporter molecules, which restricts multiplexing and quantitation, hindering the analysis of tissue microarchitecture and molecular expression in clinical diagnostics and research.
Innovation Solution
A method using secondary ion mass spectrometry (SIMS) for multiplexed ion beam imaging (MIBI) that labels samples with mass tags, allowing for simultaneous detection of multiple antigens by scanning with a primary ion beam to generate spatially-addressable measurements of mass tag abundance, enabling high-resolution imaging of cells and extracellular structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional IHC methods use multiple enzyme-linked secondary antibodies for simultaneous detection of multiple antigens, then detection capability for multiple targets is improved, but the number of detectable antigens is limited to two due to difficulties in sample preparation and imaging
Solution Approach 1:
The patent replaces optical detection systems (fluorescence microscopy) with mass spectrometry detection. By using mass tags with unique mass-to-charge ratios instead of fluorescent labels, the system eliminates spectral overlap issues and enables simultaneous detection of many more antigens without increasing imaging complexity
Solution Approach 2:
The patent employs a universal detection platform (mass spectrometry) that can detect multiple different mass tags simultaneously. This universal approach allows the same detection system to handle numerous antigens without requiring separate optimization for each target, thereby increasing versatility without proportionally increasing complexity
2Measurement precision
If fluorescent labels are used for simultaneous detection of multiple molecular targets, then signal-to-noise ratio is improved, but the need for primary antibodies from dissimilar host species and non-overlapping emission spectra limits multiplexing
Solution Approach 1:
The patent changes the detection parameter from optical wavelength (fluorescence emission spectra) to mass-to-charge ratio. This parameter change allows the use of mass tags with unique masses instead of fluorescent labels with non-overlapping spectra, eliminating the constraint of requiring non-overlapping emission spectra while maintaining high signal-to-noise ratio through mass spectrometry's inherent specificity
Solution Approach 2:
The patent introduces mass tags as intermediary molecules that bridge the primary antibody and the detection system. These mass tags serve as universal reporters detected by mass spectrometry, replacing the need for fluorescent labels and eliminating constraints related to host species and emission spectra overlap
3Measurement precision
If secondary antibodies with enzymatic reporters are used for signal amplification, then detection sensitivity is improved, but non-linear staining limits reliable multiplexing and quantitation
Solution Approach 1:
The patent replaces enzymatic amplification systems with direct mass spectrometry detection. By detecting the mass tags directly without enzymatic conversion, the system achieves linear quantitation where the signal intensity directly correlates with antigen concentration, eliminating the non-linear staining problem while maintaining high sensitivity through the inherent detection capability of mass spectrometry
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
MIBI provides high-resolution, multiplexed imaging capable of analyzing up to 100 targets simultaneously with improved dynamic range and linearity, overcoming the limitations of conventional IHC by eliminating background signal and spectral overlap, and allowing for quantitative analysis of protein expression patterns in tissue sections.
Implementation Method 1
scanning the sample with a secondary ion mass spectrometer (SIMS) ion beam to generate a data set that comprises spatially-addressable measurements of the abundance of the mass tag
Implementation Method 2
secondary ion mass spectrometry (SIMS) for multiplexed ion beam imaging (MIBI) that labels samples with mass tags, allowing for simultaneous detection of multiple antigens
Data Source
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AI summary
A method of generating a high resolution two-dimensional image of a sample comprising cells and extracellular structures is provided. In certain embodiments, the method comprises: labeling a sample with at least one mass tag, thereby producing a labeled sample; scanning the sample with a secondary ion mass spectrometer (SIMS) ion beam to generate a data set that comprises spatially-addressable measurements of the abundance of the mass tag across an area of the sample; and outputting the data set. In many embodiments, the data set contains the identity and abundance of the mass tag. A system for performing the method is also provided.