Abstract
Introduction
Meningitis, a morbidly infectious central nervous system pathology is accompanied by acute inflammation of the meninges, causing raised intracranial pressure linked with serious neurological sequelae.
Objective
To observe the variation in the metabolic profile, that may occur in serum and urine along with CSF in adults using 1H NMR spectroscopy, with an attempt of appropriate and timely treatment regimen.
Methods
The 1H NMR-based metabolomics has been performed in 115 adult subjects for differentiating bacterial meningitis (BM) and tubercular meningitis (TBM).
Results
The discriminant function analysis (DFA) of the three bio-fluids collectively identified 3-hydroxyisovalerate, lactate, glucose, formate, valine, alanine, ketonic bodies, malonate and choline containing compounds (choline and GPC) as significant metabolites among cases versus control group. The differentiation of bacterial meningitis and tuberculous meningitis (BM vs. TBM) can be done on the basis of identification of 3-hydroxyisovalerate, isobutyrate and formate in case of CSF (with a correct classification of 78 %), alanine in serum (correct classification 60 %), valine and acetone in case of urine (correct classification 89.1 %). The NMR spectral bins based orthogonal signal correction principal component analysis score plots of significant metabolites obtained from DFA also provided group classification among cases versus control group in CSF, serum and urine samples. The variable importance in projection scores also identified similar significant metabolites as obtained from DFA, collectively in CSF, serum and urine samples, responsible for differentiation of meningitis.
Conclusion
The CSF contained metabolites which are formed during infection and inflammation, and these were also found in significant quantity in serum and urine samples.
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Abbreviations
- BM:
-
Bacterial meningitis/pyogenic meningitis
- CPMG:
-
Carr-purcell-meiboom-gill
- CSF:
-
Cerebrospinal fluid
- CT:
-
Computed tomography
- DFA:
-
Discriminant function analysis
- FDR:
-
False discovery rate
- MRI:
-
Magnetic resonance imaging
- NMR:
-
Nuclear magnetic resonance
- NOESY:
-
Nuclear overhauser effect spectroscopy
- OSC-PCA:
-
Orthogonal signal correction-principal component analysis
- PLS-DA:
-
Partial least square discriminant analysis
- SD:
-
Standard deviation
- TBM:
-
Tubercular meningitis
- TSP:
-
Trimethylsilyl propionate
- VIP:
-
Variables importance in projection
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Acknowledgments
The authors are thankful to Dr. Ram Manohar Lohia Institute of Medical Sciences for intramural funding (IEC 14/11) to carry out the study and Centre of Biomedical Research, Lucknow where the 1H NMR spectroscopy was conducted. Dr. Suruchi Singh would like to extend her thanks to Council of Scientific and Industrial Research (RA Award No.: 09/916/(0077)/2013/EMR-I) for financial assistance.
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The authors have no potential conflict of interest. The disclosure of potential conflict of interest in the prescribed format has been obtained from all the authors.
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The study was ethically approved and the work was performed in strict accordance with the guidelines of Institutional Ethical Committee of Dr. Ram Manohar Lohia Institute of Medical Sciences (IEC 14/11).
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The subjects were explained the study procedure and written and informed consent were obtained from them prior to the study. The authors: Tanushri Chatterji, Suruchi Singh, Manodeep Sen, Ajai Kumar Singh, Pradeep Kumar Maurya, Nuzhat Husain, Janmejai Kumar Srivastava, Sudhir Kumar Mandal, and Raja Roy are aware of ethical policy.
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Tanushri Chatterji and Suruchi Singh have contributed equally.
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Chatterji, T., Singh, S., Sen, M. et al. Comprehensive 1H NMR metabolic profiling of body fluids for differentiation of meningitis in adults. Metabolomics 12, 130 (2016). https://doi.org/10.1007/s11306-016-1073-y
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DOI: https://doi.org/10.1007/s11306-016-1073-y