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01-05-2019 | Insulins | Original Article

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

Authors: María Encarnación Palomo-Buitrago, Mònica Sabater-Masdeu, Jose Maria Moreno-Navarrete, Estefanía Caballano-Infantes, María Arnoriaga-Rodríguez, Clàudia Coll, Lluís Ramió, Martina Palomino-Schätzlein, Patricia Gutiérrez-Carcedo, Vicente Pérez-Brocal, Rafael Simó, Andrés Moya, Wifredo Ricart, José Raúl Herance, José Manuel Fernández-Real

Published in: Acta Diabetologica | Issue 5/2019

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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Title: Glutamate interactions with obesity, insulin resistance, cognition and gut microbiota composition
Authors: María Encarnación Palomo-Buitrago
Mònica Sabater-Masdeu
Jose Maria Moreno-Navarrete
Estefanía Caballano-Infantes
María Arnoriaga-Rodríguez
Clàudia Coll
Lluís Ramió
Martina Palomino-Schätzlein
Patricia Gutiérrez-Carcedo
Vicente Pérez-Brocal
Rafael Simó
Andrés Moya
Wifredo Ricart
José Raúl Herance
José Manuel Fernández-Real
Publication date: 01-05-2019
Publisher: Springer Milan
Keywords: Insulins
Respiratory Microbiota
Insulins
Published in: Acta Diabetologica / Issue 5/2019
Print ISSN: 0940-5429
Electronic ISSN: 1432-5233
DOI: https://doi.org/10.1007/s00592-019-01313-w

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