Abstract
In this paper, a new strategy for processing GC/MS based metabolic profiling data via multivariate methods was proposed, which is applied to a small pilot study of impaired fasting glucose. The data obtained from plasma samples of impaired fasting glucose patients and healthy controls were first treated by principal component analysis and partial least squares-discriminant analysis to explore the differences and discriminators of the two groups. Subsequently, correlation analyses were employed to examine the relationships between blood glucose and the discriminators or their linear combination, thus may be considered as potential biomarkers of impaired fasting glucose. The results showed that the metabolic patterns of the two groups were different. Furthermore, eleven metabolites were screened as discriminators. Levels of nine of the eleven discriminators, say lactate, 2-ketoisocaproic acid, alanine, α-hydroxyisobutyric acid, urea, phosphoric acid, α-glycerophosphoric acid, palmitic acid and stearic acid, were found to be significantly higher in impaired fasting glucose patients, while 1-monopalmitin and 1-monostearin showed the opposite trend. Correlation analysis indicated that 2-ketoisocaproic acid, stearic acid were positively, while 1-monopalmitin and 1-monostearin were negatively correlated with blood glucose. Moreover, blood glucose correlated well with the linear combination of the eleven discriminators by canonical correlation analysis. The results have demonstrated that 2-ketoisocaproic acid, stearic acid and the linear combination of the eleven discriminators may be considered as the potential biomarkers of impaired fasting glucose and the proposed method may be useful in a larger study for exploring the metabolic alterations and biomarker candidates of diseases.
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Abbreviations
- BMI:
-
Body mass index
- DBP:
-
Diastolic blood pressure
- FBS:
-
Fasting blood sugar
- HDL:
-
High density lipoprotein
- LDL:
-
Low density lipoprotein
- PCA:
-
Principal component analysis
- PLS-DA:
-
Partial least squares-discriminant analysis
- SBP:
-
Systolic blood pressure
- TC:
-
Total cholesterol
- TG:
-
Total triglyceride
- WHR:
-
Waist-hip ratio
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Acknowledgment
This work was supported financially by International Traditional Chinese Medicine Program for Cooperation in Science and Technology (No. 2006DFA41090 and 2007DFA40680), National Key Basic Research Program (No. 2006CB503901) founded by the Ministry of Science and Technology of the People’s Republic of China.
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Zeng, M., Xiao, Y., Liang, Y. et al. Metabolic alterations of impaired fasting glucose by GC/MS based plasma metabolic profiling combined with chemometrics. Metabolomics 6, 303–311 (2010). https://doi.org/10.1007/s11306-009-0193-z
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DOI: https://doi.org/10.1007/s11306-009-0193-z