Metabolic Differences between Ex-Smokers and Nonsmokers: A Metabolomic Analysis
Lirong Liang1, Lin Feng1, Long Zhou2
1Department of Research on Tobacco Dependence Therapies Beijing Institute of Respiratory Medicine and Beijing Chao-Yang Hospital, Capital Medical University, Beijing, China.
Quitting smoking helps restore blood metabolite levels to normal, though ex-smokers may experience weight gain. Key metabolites and pathways related to weight gain were identified in this metabolomics study.
Area of Science:
- Metabolomics
- Biochemistry
- Smoking Cessation Research
Background:
- Smoking significantly alters numerous physiological processes.
- Understanding metabolite changes post-smoking cessation is crucial for health.
- Weight gain is a common concern for individuals who quit smoking.
Purpose of the Study:
- To compare blood metabolite profiles between ex-smokers and current nonsmokers.
- To investigate the relationship between metabolite changes and weight gain in ex-smokers.
- To identify key metabolites and metabolic pathways affected by smoking cessation.
Main Methods:
- Nontargeted liquid chromatography-mass spectrometry (LC-MS) metabolomics on blood samples.
- Multivariate statistical analyses including principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA).
- Enrichment analysis (Kyoto Encyclopedia of Genes and Genomes - KEGG pathways) and weighted gene co-expression network analysis (WGCNA) with maximal correlation coefficient (MCC) algorithms.
Main Results:
- No significant overall differences in blood metabolite levels were found between ex-smokers and nonsmokers.
- Biosynthesis pathways for valine, leucine, and isoleucine were associated with differential metabolites, with five key metabolites identified.
- Ten differential metabolites potentially linked to weight gain were identified in ex-smokers.
Conclusions:
- Smoking cessation appears to restore blood metabolite levels towards normal.
- Weight gain in ex-smokers is associated with specific metabolite alterations.
- Identified metabolites and pathways offer potential targets for future clinical investigations.
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