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Sensitive CSF ELISAs for the detection of MBL, MASP-2 and functional MBL/MASP-2
Janet Y Kwok1, Ryan M Augst, Denise Y Yu
1Department of Pediatrics, Division of Infectious Diseases, University of California San Diego, La Jolla, CA 92093-0672, USA.
Insights
New sensitive ELISAs detect mannose binding lectin (MBL), functional MBL-MASP-2 (fMBL), and MBL-associated serine protease-2 (MASP-2) in cerebrospinal fluid (CSF). These methods are crucial for studying neuroinflammatory and neurodegenerative diseases.
Area of Science:
- Immunology and Neuroscience
- Biochemistry and Molecular Biology
Background:
- The mannose binding lectin (MBL) complement pathway is vital for innate immunity in infections, including neuroinflammatory and neurodegenerative diseases.
- Existing Enzyme-Linked Immunosorbent Assays (ELISAs) can quantify MBL, MBL-associated serine protease-2 (MASP-2), and functional MBL-MASP-2 (fMBL) in plasma, serum, and cell supernatants.
- However, established methods for measuring these proteins in cerebrospinal fluid (CSF) are lacking.
Purpose of the Study:
- To develop sensitive and reproducible Enzyme-Linked Immunosorbent Assays (ELISAs) for the detection of MBL, fMBL, and MASP-2 in human cerebrospinal fluid (CSF).
- To establish reliable methods for quantifying key components of the MBL-mediated complement pathway within the central nervous system.
Main Methods:
- Standard ELISAs were adapted for the specific detection of MBL, fMBL, and MASP-2 in CSF samples.
- A biotinyl-tyramide based horseradish peroxidase (HRP) signal amplification technique was employed to enhance assay sensitivity.
- The developed assays were validated for sensitivity and reproducibility in CSF matrices.
Main Results:
- Sensitive ELISAs were successfully developed for the detection of MBL, fMBL, and MASP-2 in cerebrospinal fluid (CSF).
- The modified ELISA protocols, coupled with biotinyl-tyramide signal amplification, demonstrated high sensitivity and reproducibility.
- These assays enable accurate quantification of these complement proteins within the CSF.
Conclusions:
- Modified ELISAs utilizing biotinyl-tyramide based HRP signal amplification provide a sensitive and reproducible method for detecting MBL, fMBL, and MASP-2 in CSF.
- These novel assays fill a critical gap in diagnostic and research capabilities for neurological conditions involving the MBL complement pathway.
- The developed methods will facilitate further investigation into the role of MBL-mediated immunity in neuroinflammatory and neurodegenerative diseases.
Abstract:
Mannose binding lectin (MBL) mediated complement pathway is an important constituent of innate immune response in several infections including neuroinflammatory and neurodegenerative diseases. Although there are Enzyme-Linked Immunosorbent Assays (ELISAs) for estimating MBL, MBL-associated serine protease-2 (MASP-2) and functional MBL-MASP-2 (fMBL) proteins for the plasma, serum and cell supernatants there are no established methods for their estimation in the cerebrospinal fluid (CSF). We developed sensitive ELISAs for the detection of MBL, fMBL and MASP-2 in the CSF. First, we adapted standard ELISAs for the detection of these proteins in the CSF. Second, we used a biotinyl-tyramide based horseradish peroxidase (HRP) signal amplification for the sensitive detection of these proteins in the CSF. In summary, using modified ELISA and biotinyl-tyramide based HRP signal amplification, we successfully detected MBL, fMBL and MASP-2 proteins in the CSF samples with high sensitivity and reproducibility.
