Quantitative proteomics for identifying biomarkers for tuberculous meningitis
- Ghantasala S Sameer Kumar1, 2,
- Abhilash K Venugopal1, 2, 3, 4,
- Anita Mahadevan5,
- Santosh Renuse1, 3, 4, 6,
- H C Harsha1,
- Nandini A Sahasrabuddhe1, 7,
- Harsh Pawar1, 8,
- Rakesh Sharma9,
- Praveen Kumar1,
- Sudha Rajagopalan10,
- Keith Waddell11,
- Yarappa L Ramachandra2,
- Parthasarathy Satishchandra12,
- Raghothama Chaerkady1, 2, 3, 4,
- T S Keshava Prasad1, 6, 7, 13,
- K Shankar5Email author and
- Akhilesh Pandey1, 3, 4, 14, 15Email author
© Kumar et al.; licensee BioMed Central Ltd. 2012
Received: 10 February 2012
Accepted: 15 October 2012
Published: 30 November 2012
Tuberculous meningitis is a frequent extrapulmonary disease caused by Mycobacterium tuberculosis and is associated with high mortality rates and severe neurological sequelae. In an earlier study employing DNA microarrays, we had identified genes that were differentially expressed at the transcript level in human brain tissue from cases of tuberculous meningitis. In the current study, we used a quantitative proteomics approach to discover protein biomarkers for tuberculous meningitis.
To compare brain tissues from confirmed cased of tuberculous meningitis with uninfected brain tissue, we carried out quantitative protein expression profiling using iTRAQ labeling and LC-MS/MS analysis of SCX fractionated peptides on Agilent’s accurate mass QTOF mass spectrometer.
Results and conclusions
Through this approach, we identified both known and novel differentially regulated molecules. Those described previously included signal-regulatory protein alpha (SIRPA) and protein disulfide isomerase family A, member 6 (PDIA6), which have been shown to be overexpressed at the mRNA level in tuberculous meningitis. The novel overexpressed proteins identified in our study included amphiphysin (AMPH) and neurofascin (NFASC) while ferritin light chain (FTL) was found to be downregulated in TBM. We validated amphiphysin, neurofascin and ferritin light chain using immunohistochemistry which confirmed their differential expression in tuberculous meningitis. Overall, our data provides insights into the host response in tuberculous meningitis at the molecular level in addition to providing candidate diagnostic biomarkers for tuberculous meningitis.
KeywordsRelative quantitation Cerebrospinal fluid Histopathology Early diagnosis Tuberculosis
Tuberculosis (TB) is a common and sometimes fatal transmissible disease, especially in developing countries. Approximately thirty percent of the global population is exposed to the acid-fast bacilli causing TB. Of those who are infected with tuberculosis, ~10% percent develop a clinical manifestation of the disease during their lifetime. From a global perspective, approximately twenty percent of TB infected population live in India. The World Health Organization (WHO) has estimated that one million children develop TB annually worldwide which accounts for about 11% of all TB cases . Tuberculous bacilli most commonly infect lungs. Mycobacterium tuberculosis (MTB) may also spread to extrapulmonary sites including the meninges, lymph nodes, genitourinary tract, skeletal system and skin . Tuberculous meningitis (TBM) is the infection of meninges caused by MTB, with a mortality rate of ~30%. Further, those who survive TBM are usually left with severe neurological defects [3–5]. There is an increased risk of TBM in HIV-infected patients as compared to non-HIV infected cases although the clinical manifestations of the disease do not differ between the two groups [6, 7].
Culturing mycobacteria and subsequent microbiological examination is considered a gold standard for the diagnosis of TBM. However, this method is time consuming and insensitive, with a positive outcome achieved only in 25–70% of clinically diagnosed cases . Although PCR assays can be an alternative rapid approach for diagnosis, they cannot differentiate between latent or active forms of the disease. Although nucleic acid amplification test (NAAT) has a high specificity when tested in body fluids, it lacks adequate sensitivity in cases of meningitis and pleuritis .
Amongst the existing molecular markers, Adenosine deaminase isoenzyme-2 (ADA2) has a sensitivity of 100% and a specificity of 86.4% for the detection of TBM in cerebrospinal fluid (CSF) . Adenosine deaminase (ADA) activity in the CSF of TBM patients has been suggested to be useful for early differential diagnosis of TBM . The ADA activity of CSF and plasma have been evaluated as a diagnostic aid in TBM  and ADA activity in CSF was considered to be a simple, useful and rapid diagnostic test for early recognition of TBM in children . However, overexpression of ADA was also often overexpressed in other forms of meningitis including infections with pyogenic bacteria . In the CSF of TBM patients, the presence of 65 kDa heat shock protein antigen might be a marker for early diagnosis of the disease . High levels of CSF lactate and lactate dehydrogenase levels have also been suggested for diagnosing TBM .
Early diagnosis of TBM is considered a key to effective treatment and prognosis. Approximately 90% of the patients are diagnosed in stage II or III . Overall, the diagnosis of TBM still remains a major challenge due to inadequate current diagnostic methods and poor sensitivity and/or specificity of existing markers. Although corticosteroids are used extensively to reduce mortality and neurological disability, it may not be the only solution to reduce the mortality and morbidity . In TBM, a number of pathological changes including meningeal adhesion, infarction, tuberculoma and hydrocephalus may occur leading to neurological sequelae . These sequelae are known to correlate with the stage of meningitis at admission. Patients treated at an early stage have a five times higher chance of recovery than those with advanced disease stages . Therefore, patient’s clinical condition at admission and delay in starting the treatment are important factors for determining their survival . These findings emphasize the need to focus on identifying candidate molecular markers which can be developed as diagnostic tools in the management of TBM.
Mass spectrometry-based quantitative proteomics has emerged as a powerful approach for identifying and studying disease biomarkers and has become one of the essential tools in biomarker discovery [21, 22]. Advances in quantitative mass spectrometry have led to identification and quantitation of biomarkers which serve as indicators of disease progression, prognosis, drug safety and help to elucidate the mechanism of drug treatment . There are various labeling approaches that one can employ to carry out quantitative proteomic measurements. In vitro labeling methods include Isobaric Tags for Relative and Absolute Quantitation (iTRAQ), Isotope-Coded Affinity Tags (ICAT), 18 O labeling and in vivo methods include Stable Isotope Labeling by Amino acids in Cell culture (SILAC) and 15 Nlabeling [24, 25]. iTRAQ labeling is an effective method for studying differential protein expression levels in tissue samples. It has been extensively used for biomarker discovery in various disease contexts [26–34].
In this study, we used an iTRAQ-based quantitative proteomic approach to identify differentially expressed proteins from brain tissues of tuberculous meningitis cases as compared to controls. We identified several proteins which are differentially expressed in TBM. These proteins include both novel and previously reported candidate protein markers. We validated some of these candidate biomarkers using immunohistochemical labeling.
Materials and methods
The study was approved by scientific ethics committee of National Institute of Mental Health and Neuro Sciences (NIMHANS), Bangalore, India. Samples from frontal cortex with overlying meninges from cases of tuberculous meningitis (n=6) and similar, but uninfected, control brain tissues (n=6) from victims of road traffic accidents were collected at the time of autopsy. The autopsy was conducted within 8–16 h postmortem with the body kept at 4°C after death. The samples were obtained from the Human Brain Tissue Repository, Department of Neuropathology, NIMHANS, Bangalore. Sample details including the selection criteria are provided in Additional file 1: Table S1.
Sample preparation and iTRAQ labeling
Brain tissue samples were lysed in 0.5% SDS, sonicated, homogenized and centrifuged at 13,000 rpm for 10 min at 4°C. Supernatant was collected and protein quantitation was carried out by Lowry’s assay (Bio-Rad Hercules, CA; USA). For each condition, 160 μg of protein sample was utilized for the experiment. Each sample was treated with 4 μL of reducing agent (tris (2-carboxyethyl) phosphine (TCEP)) at 60°C for 1 h and alkylated with 2 μL of cysteine blocking reagent, methyl methanethiosulfonate (MMTS) for 10 min at room temperature. After alkylation, the samples were subjected to trypsin digestion (Sequencing Grade Modified Trypsin, Promega Cat#:V511A) using 1:20 (w/w) at 37°C for 16 h. Peptide samples from each condition was split in equal halves (80 μg each) and labeled with iTRAQ 4-plex reagents (catalog # 4352135, Applied Biosystems, Foster City, CA, USA) as per manufacturer’s protocol. We used technical replicates for control and TBM samples. Peptides from control samples were labeled with iTRAQ reagents yielding reporter ions 114 and 115 while peptides from TBM were labeled with 116 and 117. The samples were pooled following iTRAQ labeling.
Strong cation exchange chromatography (SCX)
Pooled iTRAQ labeled peptides were fractionated by strong cation exchange chromatography on PolySULFOETHYL A column (200 x 2.1 mm; 5 μm; 200Å PolyLC, Columbia, MD) using Agilent’s 1200 series HPLC system. The peptides were reconstituted in SCX solvent A (10 mM potassium phosphate, 25% acetonitrile, pH 2.8) and loaded on SCX column isocratically using 100% solvent A for 20 min at a flow rate of 200 ul per minute. Peptides were eluted using a 30 min gradient from 8% to 35% solvent B (350 mM KCl in solvent A). Fractions were collected every minute using a fraction collector. The fractions were vacuum dried and stored at −80°C until LC-MS/MS analysis.
The samples were analyzed on HPLC chip-cube interfaced with Accurate Mass 6520 quadrupole time of flight mass (QTOF) spectrometer (Agilent Technologies, Santa Clara, CA). The HPLC-Chip contains a 40 nl enrichment column and 43 mm x 75 um analytical column. These columns were made up of a reversed-phase material Zorbax 300SB-C18, with a particle size of 5 μm. The samples were loaded onto the enrichment column using Agilent’s 1200 series capillary liquid chromatography pump at a flow rate of 3 μl/min using 97% solvent A and 3% solvent B. An injection flush volume of 4 μl was applied during enrichment step. The peptides were eluted at a flow rate of 400 nl/min using a gradient of solvent A (0.1% formic acid) and solvent B (0.1% formic acid in 90% acetonitrile). The gradient was started from 3% to18% of solvent B over 8 min, subsequently changed to 22% B in the next 7 min and finally changed to 45% of solvent B for 25 min. MassHunter workstation data acquisition software (Version B.01.03) was used for data dependent acquisition. MS spectra were acquired for 1 second from m/z 350–1800 followed by three MS/MS spectra in next second comprising the duty cycle of 2.1 second including an interscan delay of 0.1 second. Precursor ions were preferred based on charge state in the order of 2+, 3+ and >3+. The capillary and fragmentor voltage of 1950V and 175 V respectively was applied with a medium isolation width of 4 m/z and a collision energy slope of 3 V plus at offset of 2 V.
The mass spectrometry raw data was processed to peak list format by using MassHunter Qualitative Analysis software (Agilent Technologies, Version B.03.3). These processed peak list files were then searched against Human RefSeq Protein Database (Release 40) containing 31,811 protein sequences through Proteome Discoverer platform (Thermo Scientific, Version 1.2). The workflow includes spectrum files, spectrum selector, Mascot and Sequest search nodes followed by peptide validator for false discovery analysis whereas a reporter ion quantifier was used for quantitation. Search parameters included trypsin as the enzyme with one missed cleavage allowed, oxidation of methionine, deamidation at aspargine and glutamine were set as a variable modification whereas methyl-thio at cysteine and iTRAQ label at N-terminus of the peptide and lysine were set as a fixed modification. The reporter ion window tolerance was set at 100 ppm. The identified peptides were filtered using 1% false discovery rate derived using decoy database search strategy and top ranked hit based on peptide score, XCorr and IonScore for Sequest and Mascot respectively. The search results from both Masoct and Sequest were merged and unique peptide(s) identified for each protein were used to calculate relative protein quantitation in Proteome Discoverer workflow. The average ratio was used for relative protein quantification for proteins with multiple peptide matches. Bioinformatic analysis was carried out to categorize proteins based on biological processes, cellular component and molecular function classification using annotations in Human Protein Reference Database (HPRD, http://hprd.org) , which is in compliance with gene ontology (GO) standards.
Formalin fixed and paraffin embedded autopsy tissues were collected and cut into 4 μm thick sections on glass slides. These slides were subjected for deparaffinization and rehydration. Endogenous peroxidase activity was quenched by 3% H2O2 for 20 min at room temperature. For antigen retrieval, the tissue sections were microwaved in citrate buffer (pH 6.0) for 30 min. The tissue sections were incubated with 3% skimmed milk in PBS, pH 7.4 at room temperature. The tissue sections were incubated with primary antibodies at following dilutions - anti-amphiphysin (dilution 1:100, catalog # ab52646), anti-neurofascin (dilution1:250, catalog # ab31457), anti-ferritin light chain (dilution 1:500, catalog # ab69090) which were purchased from Abcam (Cambridge UK). In parallel with test slides, negative and positive controls were also subjected for overnight incubation at room temperature, followed by incubation with prediluted secondary antibody conjugated with poly HRP (catalog # K4011) from Dako. The reaction was visualized with chromogen substrate DAB/H2O2 (Dako catalog # K4007) as per manufacturer’s instructions. The sections were counterstained with hematoxylin.
Results and discussion
A partial list of proteins overexpressed in TBM
Tryptophanyl-tRNA synthetase, cytoplasmic isoform b
It induced by interferon and involved in the catalyzation of the aminoacylation of tRNA (trp) with tryptophan.
Electrogenic sodium bicarbonate cotransporter 1 isoform 2
It plays a functional role in the regulation of bicarbonate secretion and absorption and intracellular pH.
Nucleophosmin isoform 3
It is a phosphoprotein which shuttles between the nucleus and the cytoplasm. It plays a role in ARF/p53 signaling pathway.
ATP-dependent RNA helicase A
It localizes to cytoplasm and nucleus. It acts as a transcriptional regulator.
Neuron-specific calcium-binding protein hippocalcin
It belongs to the neuron-specific calcium-binding proteins family. It may play a role in the neurons of the central nervous system.
Neuronal membrane glycoprotein M6-a isoform 3
It is a transmembrane protein and expressed on neurons in the central nervous system.
Glial fibrillary acidic protein isoform 2
It is an intermediate filament protein and a marker for astrocytes. It is overexpressed in astrogliosis.
Sodium/calcium exchanger 2 precursor
It is a Sodium/calcium exchanger, regulates the intracellular calcium concentrations.
It belongs to the intermediate filament protein family. It plays a role in cell shape and integrity.
VGF nerve growth factor inducible precursor
It expressed in neuroendocrine cells and overexpressed by nerve growth factor
A partial list of downregulated proteins in TBM
Protein disulfide-isomerase A6 precursor
It is endoplasmic reticulum (ER) resident protein and it plays a role in folding of disulfide-bonded proteins
Importin subunit alpha-4
It is cytoplasmic protein, recognizes nuclear localization signals.
Prefoldin subunit 5 isoform alpha
It belongs to the prefoldin alpha subunit family. It is a subunit of the molecular chaperone complex, involved in protein folding.
It belongs to the class II family of tRNA synthetases and this protein plays a role in autoimmune diseases.
Malate dehydrogenase, cytoplasmic
It localized to the cytoplasm and mitochondria. It involved in malate-aspartate shuttle.
Adenylate kinase isoenzyme 1
It is an enzyme involved in regulating the adenine nucleotide composition in the cell and it is localized in the cytosol.
LanC-like protein 1
It is a loosely associated peripheral membrane protein which belongs to the LanC family of bacterial membrane-associated proteins. It plays a role in antimicrobial peptide synthesis.
It belongs to the member of the synuclein family of proteins and it may play a role in the pathogenesis of neurodegenerative diseases.
Protein-tyrosine phosphatase-like member B
It localizes to endoplasmic reticulum (ER) and involved in the dehydration of very long chain fatty acid synthesis
Neurochondrin isoform 2
It is a cytoplasmic protein and may play a role in spatial learning processes.
Proteins previously implicated in TBM and tuberculosis associated studies
In our previous study on TBM using gene expression microarray, we had identified 2,434 differentially regulated transcripts . In current proteomic study, 33 out of 134 differentially regulated proteins were also identified to be differentially expressed in the microarray dataset. However, only three proteins (GFAP, SIRPA, ACTB) were found to be correlated at both mRNA and protein levels, which is likely due to low correlation frequently observed between transcriptomic and proteomic studies.
Differentially expressed proteins with no previous association with TBM
We identified a large number of differentially expressed proteins, which have not been reported earlier in the literature to be associated with TBM. These novel proteins include Ca++−dependent secretion activator 2 (CADPS2) which belongs to the calcium-dependent activator of secretion (CAPS) protein family, and was found 3-fold upregulated in the present study. CADPS2 protein regulates the exocytosis of synaptic and dense-core vesicles in neurons and neuroendocrine cells [46, 47]. Amphiphysin (AMPH) (Figure 3B) is an adapter molecule which plays a role in synaptic vesicle endocytosis  and it was found to be 3.7-fold overexpressed in TBM compared to control cases. Heat shock protein 90kDa alpha (cytosolic), class A member 1 (HSP90AA1) is a highly conserved molecular chaperone and was found to be 2.1-fold upregulated in the present study. HSP90AA1 is a molecular chaperone, which plays a role in signal transduction, protein degradation, protein folding and is expressed under stress conditions and according to a recent report it plays a role in gene expression in mammalian cells . Neurofascin (NFASC) (Figure 3C) is the L1 family immunoglobulin cell adhesion molecule, found to be 2-fold upregulated in the current study. NFASC plays a role in organization of the axon initial segment (AIS) and nodes of Ranvier in central nervous system, neurite extension and neurite fasciculation [50–52]. Ferritin, light chain (FTL) (Figure 3D) protein is an iron storage protein which, play a role in neurodegeneration  and found to be 66-fold downregulated in the present study. Downregulation of FTL causes the depigmentation in metastatic melanoma cells  and responds during inflammation especially where oxidative stress and reactive oxygen intermediates are generated [55, 56].
Validation of candidate biomarkers by immunohistochemical labeling
We used immunohistochemistry (IHC) to validate a subset of differentially expressed proteins identified in iTRAQ-based study. The results from IHC validation of AMPH, NFASC and FTL from fifteen TBM cases are summarized below.
Public availability of proteomic data
We have submitted the peptide data to Human Proteinpedia (http://www.humanproteinpedia.org)  and raw data files to Tranche data repository (https://proteomecommons.org/tranche/) for easy access to the research community. The raw data is freely available in Tranche using the following hash:
The combination of mass spectrometry and quantitative proteomics is being increasingly utilized for discovering potential biomarkers. In the current study, using an iTRAQ-based quantitative proteomic approach, we were able to identify several known and novel molecules that are differentially expressed in TBM. We validated the expression levels of three novel biomarker candidates - AMPH, NFASC and FTL - by IHC on brain tissue sections from TBM cases as well as controls. These promising candidate markers warrant further evaluation in CSF from TBM patients to determine their clinical utility.
Isobaric tag for relative and absolute quantitation
Tris (2-carboxyethyl) phosphine
Triethylammonium bicarbonate buffer
Polymer conjugate of horseradish peroxidase
High performance liquid chromatography
Strong cation exchange
False discovery rate.
This study was supported by “DBT Programme Support on Neuroproteomics for Proteomic Investigation of Neurological Disorders.” Nandini Sahasrabuddhe and Harsh Pawar are recipients of Senior Research fellowship award from the Council for Scientific and Industrial Research (CSIR) of the Government of India. Santosh Renuse is a recipient of Senior Research fellowship award from the University Grants Commission (UGC) of the Government of India. Rakesh Sharma is a Research associate supported by DBT. T. S. Keshava Prasad is supported by a research grant on “Establishment of a National Database on Tuberculosis” and “Development of Infrastructure and a Computational Framework for Analysis of Proteomic Data” from DBT. Harsha Gowda is a Wellcome Trust-DBT India Alliance Early Career Fellow. Human brain tissues for the study were obtained from the Human Brain Tissue Repository, a national research facility in the Department of Neuropathology, National Institute of Mental Health and Neuro Sciences, Bangalore, India. Secretarial assistance of Mrs. Manjula Madan is acknowledged.
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