1. Sex and race differences of cerebrospinal fluid metabolites in healthy individuals.
- Author
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Reavis ZW, Mirjankar N, Sarangi S, Boyle SH, Kuhn CM, Matson WR, Babyak MA, Matson SA, Siegler IC, Kaddurah-Daouk R, Suarez EC, Williams RB, Grichnik K, Stafford-Smith M, and Georgiades A
- Subjects
- Adult, Cysteine cerebrospinal fluid, Female, Humans, Hydroxyindoleacetic Acid cerebrospinal fluid, Indoleacetic Acids cerebrospinal fluid, Kynurenine analogs & derivatives, Kynurenine cerebrospinal fluid, Male, Melatonin cerebrospinal fluid, Metabolomics, Serotonin analogs & derivatives, Serotonin cerebrospinal fluid, Sex Characteristics, Uric Acid cerebrospinal fluid, Xanthine cerebrospinal fluid, Xanthines cerebrospinal fluid, alpha-Tocopherol cerebrospinal fluid, Cerebrospinal Fluid chemistry, Metabolome, Race Factors, Sex Factors
- Abstract
Introduction: Analyses of cerebrospinal fluid (CSF) metabolites in large, healthy samples have been limited and potential demographic moderators of brain metabolism are largely unknown., Objective: Our objective in this study was to examine sex and race differences in 33 CSF metabolites within a sample of 129 healthy individuals (37 African American women, 29 white women, 38 African American men, and 25 white men)., Methods: CSF metabolites were measured with a targeted electrochemistry-based metabolomics platform. Sex and race differences were quantified with both univariate and multivariate analyses. Type I error was controlled for by using a Bonferroni adjustment (0.05/33 = .0015)., Results: Multivariate Canonical Variate Analysis (CVA) of the 33 metabolites showed correct classification of sex at an average rate of 80.6% and correct classification of race at an average rate of 88.4%. Univariate analyses revealed that men had significantly higher concentrations of cysteine (p < 0.0001), uric acid (p < 0.0001), and N-acetylserotonin (p = 0.049), while women had significantly higher concentrations of 5-hydroxyindoleacetic acid (5-HIAA) (p = 0.001). African American participants had significantly higher concentrations of 3-hydroxykynurenine (p = 0.018), while white participants had significantly higher concentrations of kynurenine (p < 0.0001), indoleacetic acid (p < 0.0001), xanthine (p = 0.001), alpha-tocopherol (p = 0.007), cysteine (p = 0.029), melatonin (p = 0.036), and 7-methylxanthine (p = 0.037). After the Bonferroni adjustment, the effects for cysteine, uric acid, and 5-HIAA were still significant from the analysis of sex differences and kynurenine and indoleacetic acid were still significant from the analysis of race differences., Conclusion: Several of the metabolites assayed in this study have been associated with mental health disorders and neurological diseases. Our data provide some novel information regarding normal variations by sex and race in CSF metabolite levels within the tryptophan, tyrosine and purine pathways, which may help to enhance our understanding of mechanisms underlying sex and race differences and potentially prove useful in the future treatment of disease.
- Published
- 2021
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