Quantitative proteomics for identifying biomarkers for tuberculous meningitis

Area of Science:

• Neuroscience
• Infectious Diseases
• Proteomics

Background:

• Tuberculous meningitis (TBM) is a severe extrapulmonary disease caused by Mycobacterium tuberculosis.
• TBM is associated with high mortality and significant neurological damage.
• Previous research identified differentially expressed genes in TBM brain tissue.

Purpose of the Study:

• To discover protein biomarkers for tuberculous meningitis using a quantitative proteomics approach.
• To identify novel differentially regulated proteins in TBM brain tissue.
• To gain molecular insights into the host response during TBM.

Main Methods:

• Quantitative protein expression profiling was performed on brain tissues from confirmed TBM cases and uninfected controls.
• iTRAQ labeling and LC-MS/MS analysis of SCX fractionated peptides were employed.
• Agilent's accurate mass QTOF mass spectrometer was used for analysis.

Main Results:

• Both known and novel differentially regulated proteins were identified in TBM brain tissue.
• Previously identified proteins like SIRPA and PDIA6 were confirmed.
• Novel overexpressed proteins (AMPH, NFASC) and a downregulated protein (FTL) were discovered.

Conclusions:

• Amphiphysin (AMPH), neurofascin (NFASC), and ferritin light chain (FTL) were validated as differentially expressed in TBM via immunohistochemistry.
• The findings provide insights into the molecular mechanisms of host response in TBM.
• Identified proteins serve as candidate diagnostic biomarkers for tuberculous meningitis.