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Protein changes in immunodepleted cerebrospinal fluid from a transgenic mouse model of Alexander disease detected
Robert Cunningham1, Paige Jany, Albee Messing
1Department of Chemistry & School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA.
Insights
Researchers developed a new method to analyze mouse cerebrospinal fluid (CSF) proteins, identifying biomarkers for Alexander disease (AxD) in GFAP transgenic mice. This technique enhances low-volume CSF analysis for better disease insights.
Area of Science:
- Neuroscience
- Biochemistry
- Proteomics
Background:
- Cerebrospinal fluid (CSF) is a critical biological fluid in direct contact with the brain, characterized by low protein content and a wide dynamic range.
- Alexander disease (AxD) is a severe human leukodystrophy.
- Transgenic mouse models overexpressing glial fibrillary acidic protein (GFAP) serve as models for AxD.
Purpose of the Study:
- To develop and validate a modified IgY-14 immunodepletion method for enhanced analysis of low-volume mouse CSF.
- To identify and quantify proteins in the CSF of GFAP transgenic mice and control littermates.
- To discover potential protein biomarkers associated with GFAP-induced pathology relevant to AxD.
Main Methods:
- Modified IgY-14 immunodepletion technique applied to mouse CSF.
- Proteomic analysis using mass spectrometry and distributive normalized spectral abundance factor (dNSAF) spectral counting.
- Validation of identified biomarkers using enzyme-linked immunosorbent assay (ELISA) and microarray data.
Main Results:
- Identification of 289 proteins and relative quantification of 103 proteins in mouse CSF.
- Significant changes in a panel of biomarker proteins were detected in GFAP transgenic mice compared to controls.
- Methodological reproducibility and animal variability were assessed through biological and technical triplicates.
Conclusions:
- The modified IgY-14 immunodepletion method is effective for analyzing low-volume mouse CSF.
- Key protein biomarkers associated with GFAP overexpression and relevant to AxD pathogenesis were identified.
- The findings provide valuable targets for future research into the molecular mechanisms and pathology of Alexander disease.
Abstract:
Cerebrospinal fluid (CSF) is a low protein content biological fluid with a dynamic range spanning at least 9 orders of magnitude in protein content and is in direct contact with the brain. A modified IgY-14 immunodepletion treatment was performed to enhance analysis of the low volumes of CSF that are obtainable from mice. As a model system in which to test this approach, we utilized transgenic mice that overexpress the intermediate filament glial fibrillary acidic protein (GFAP). These mice are models for Alexander disease (AxD), a severe leukodystrophy in humans. From the CSF of control and transgenic mice we report the identification of 289 proteins, with relative quantification of 103 proteins. Biological and technical triplicates were performed to address animal variability as well as reproducibility in mass spectrometric analysis. Relative quantitation was performed using distributive normalized spectral abundance factor (dNSAF) spectral counting analysis. A panel of biomarker proteins with significant changes in the CSF of GFAP transgenic mice has been identified with validation from enzyme-linked immunosorbent assay (ELISA) and microarray data, demonstrating the utility of our methodology and providing interesting targets for future investigations on the molecular and pathological aspects of AxD.
