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Renopathological Microstructure Visualization from Formalin Fixed Kidney Tissue by Matrix-Assisted Laser/Desorption
S Fröhlich1, B Putz, H Schachner
1Vienna University of Technology, Institute of Chemical Technologies and Analytics, Vienna, Austria.
Abstract:
Understanding early stage renal malfunctions with regard to the glomerular filtration processes is essential for nephropathological prescreening strategies and intervention at an early stage. Mass spectrometry imaging (MSI) in combination with histopathology can provide an universal analytical approach. Proteomic and lipidomic aspects of glomerular biocompositions were applied for micro-structural differentiation in healthy rat kidney samples. Usability of commonly used tissue embedding media and the compatibility of histological staining and fixation methods were of interest. It was demonstrated that ultra-thin tissue samples (500 nm, 1 and 10 μm) can be used for lipid and peptide-based differentiation at the glomerular resolution level in formalin-fixed tissue samples in combination with preceding histological staining for correlating optical and molecular mass images.
Insights
Mass spectrometry imaging (MSI) aids early detection of kidney disease by analyzing proteins and lipids in ultra-thin kidney tissue. This technique enables micro-structural differentiation for improved nephropathological prescreening.
Area of Science:
- Nephrology
- Analytical Chemistry
- Biochemistry
Background:
- Early detection of renal malfunctions is crucial for effective nephropathological prescreening and timely intervention.
- Mass spectrometry imaging (MSI) offers a powerful analytical approach when combined with histopathology for detailed tissue analysis.
- Understanding glomerular filtration is key to diagnosing early-stage kidney disease.
Purpose of the Study:
- To investigate the utility of mass spectrometry imaging (MSI) for micro-structural differentiation of rat kidney glomeruli.
- To assess the compatibility of histological staining and fixation methods with MSI analysis.
- To evaluate the potential of MSI for early-stage nephropathological prescreening.
Main Methods:
- Proteomic and lipidomic analyses were performed on ultra-thin tissue sections (500 nm, 1 μm, and 10 μm) of healthy rat kidneys.
- Standard histological staining and fixation methods, including formalin fixation, were employed.
- Mass spectrometry imaging was correlated with optical microscopy images of stained tissue sections.
Main Results:
- Lipid and peptide-based differentiation at the glomerular level was achieved using MSI.
- Ultra-thin tissue samples were compatible with MSI analysis, even after histological staining.
- Formalin-fixed tissue samples allowed for successful correlation between optical and molecular mass images.
Conclusions:
- Mass spectrometry imaging is a viable technique for analyzing proteomic and lipidomic profiles of kidney glomeruli at high resolution.
- Histological staining and fixation methods are compatible with MSI, enabling correlative studies.
- This approach holds promise for advancing early-stage nephropathological prescreening and understanding renal disease.
