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Glutamate interactions with obesity, insulin resistance, cognition and gut microbiota composition

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Abstract

Aims

To investigate the interactions among fecal and plasma glutamate levels, insulin resistance cognition and gut microbiota composition in obese and non-obese subjects.

Methods

Gut microbiota composition (shotgun) and plasma and fecal glutamate, glutamine and acetate (NMR) were analyzed in a pilot study of obese and non-obese subjects (n = 35). Neuropsychological tests [Trail making test A (TMT-A) and Trail making test B (TMT-B)] scores measured cognitive information about processing speed, mental flexibility and executive function.

Results

Trail-making test score was significantly altered in obese compared with non-obese subjects. Fecal glutamate and glutamate/glutamine ratio tended to be lower among obese subjects while fecal glutamate/acetate ratio was negatively associated with BMI and TMT-A scores. Plasma glutamate/acetate ratio was negatively associated with TMT-B. The relative abundance (RA) of some bacterial families influenced glutamate levels, given the positive association of fecal glutamate/glutamine ratio with Corynebacteriaceae, Coriobacteriaceae and Burkholderiaceae RA. In contrast, Streptococaceae RA, that was significantly higher in obese subjects, negatively correlated with fecal glutamate/glutamine ratio. To close the circle, Coriobacteriaceae/Streptococaceae ratio and Corynebacteriaceae/Streptococaceae ratio were associated both with TMT-A scores and fecal glutamate/glutamine ratio.

Conclusions

Gut microbiota composition is associated with processing speed and mental flexibility in part through changes in fecal and plasma glutamate metabolism.

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Acknowledgements

The authors acknowledge the technical assistance of Emilio Loshuertos (Girona Biomedical Research Institute, IdIBGi) and Oscar Rovira.

Funding

This work was supported by FIS Grant (PI15/01934), FIS Grant (PI16/02064) from the National Institute of Health Carlos III and by ERDF (European Regional Development Fund).

Author information

Authors and Affiliations

Authors

Contributions

MEPB, MSM and MAR researched the data, performed the statistical analysis and wrote and edited the manuscript. CC and LR researched the data and performed neuropsychological assessment TMT-A and TMT-B MP-S, PG-C and JRH researched the data, performed the 1H-NMR for plasma and feces metabolomic analysis and contributed to the writing and editing of the manuscript. VP-B, AM performed the gut microbiota composition analysis and contributed to the writing of the manuscript. JMM-N, EC-I, RS, JRH, WR contributed to the discussion and reviewed the manuscript. JMF-R Carried out the conception and coordination of the study, contributed to statistical analysis and writing the manuscript and directly participated in the execution of the study. JMF-R is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

Corresponding authors

Correspondence to José Raúl Herance or José Manuel Fernández-Real.

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The authors declare no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study.

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Palomo-Buitrago, M.E., Sabater-Masdeu, M., Moreno-Navarrete, J.M. et al. Glutamate interactions with obesity, insulin resistance, cognition and gut microbiota composition. Acta Diabetol 56, 569–579 (2019). https://doi.org/10.1007/s00592-019-01313-w

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  • DOI: https://doi.org/10.1007/s00592-019-01313-w

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