Abstract
Aims/hypothesis
Many studies have examined the relationship between plasma metabolites and type 2 diabetes progression, but few have explored saliva and multi-fluid metabolites.
Methods
We used LC/MS to measure plasma (n=1051) and saliva (n=635) metabolites among Puerto Rican adults from the San Juan Overweight Adults Longitudinal Study. We used elastic net regression to identify plasma, saliva and multi-fluid plasma–saliva metabolomic scores predicting baseline HOMA-IR in a training set (n=509) and validated these scores in a testing set (n=340). We used multivariable Cox proportional hazards models to estimate HRs for the association of baseline metabolomic scores predicting insulin resistance with incident type 2 diabetes (n=54) and prediabetes (characterised by impaired glucose tolerance, impaired fasting glucose and/or high HbA1c) (n=130) at 3 years, along with regression from prediabetes to normoglycaemia (n=122), adjusting for traditional diabetes-related risk factors.
Results
Plasma, saliva and multi-fluid plasma–saliva metabolomic scores predicting insulin resistance included highly weighted metabolites from fructose, tyrosine, lipid and amino acid metabolism. Each SD increase in the plasma (HR 1.99 [95% CI 1.18, 3.38]; p=0.01) and multi-fluid (1.80 [1.06, 3.07]; p=0.03) metabolomic scores was associated with higher risk of type 2 diabetes. The saliva metabolomic score was associated with incident prediabetes (1.48 [1.17, 1.86]; p=0.001). All three metabolomic scores were significantly associated with lower likelihood of regressing from prediabetes to normoglycaemia in models adjusting for adiposity (HRs 0.72 for plasma, 0.78 for saliva and 0.72 for multi-fluid), but associations were attenuated when adjusting for lipid and glycaemic measures.
Conclusions/interpretation
The plasma metabolomic score predicting insulin resistance was more strongly associated with incident type 2 diabetes than the saliva metabolomic score. Only the saliva metabolomic score was associated with incident prediabetes.
Graphical Abstract
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Abbreviations
- CRP:
-
C-reactive protein
- FDR:
-
False discovery rate
- FPG:
-
Fasting plasma glucose
- HDL-C:
-
HDL-cholesterol
- LDL-C:
-
LDL-cholesterol
- MET-h/week:
-
Metabolic equivalent hours per week
- SOALS:
-
San Juan Overweight Adults Longitudinal Study
- TC:
-
Total cholesterol
- TG:
-
Triglyceride
- WC:
-
Waist circumference
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Acknowledgements
The authors thank all SOALS participants and staff for their contribution to this study. Part of this study was presented as an abstract at the virtual Metabolomics Society 2021 conference, 22–24 June 2021.
Data availability
Data are available upon reasonable request. Information on requesting data from SOALS can be found on their website: http://soals.rcm.upr.edu/.
Funding
This work was supported by the National Institutes of Health: T32CA009001 (DEH), 1K01DK136968 (DEH) and R01DK120560-01 (DEH, LL, C-HL, DTWW, FBH, MJS, KJ and SNB) and the National Institute of General Medical Sciences [U54GM133807 (KG, CMP, EM-B, KJ)].
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DTWW is a consultant to AIONCO and has equity in Liquid Diagnostics LLC. The authors declare that there are no other relationships or activities that might bias, or be perceived to bias, their work.
Contribution statement
DEH performed the statistical analyses. DEH and SNB drafted the manuscript. DEH, LL, KG, MM-L, CMP, C-HL, EM-B, CC, DTWW, JEM, FBH, MJS, KJ and SNB contributed to interpretation of the data and revised the article critically for important intellectual content. All authors approved the final version of the manuscript. DEH and SNB are guarantors of the work and, as such, had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
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Haslam, D.E., Liang, L., Guo, K. et al. Discovery and validation of plasma, saliva and multi-fluid plasma–saliva metabolomic scores predicting insulin resistance and diabetes progression or regression among Puerto Rican adults. Diabetologia (2024). https://doi.org/10.1007/s00125-024-06169-6
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DOI: https://doi.org/10.1007/s00125-024-06169-6