The insulin effect on cerebrocortical theta activity is associated with serum concentrations of saturated nonesterified Fatty acids.
BACKGROUND
Insulin action in the brain contributes to adequate regulation of body weight, neuronal survival, and suppression of endogenous glucose production. We previously demonstrated by magnetoencephalography in lean humans that insulin stimulates activity in beta and theta frequency bands, whereas this effect was abolished in obese individuals.


OBJECTIVE
The present study aims to define metabolic signals associated with the suppression of the cerebrocortical response in obese humans.


METHODS
We determined insulin-mediated modulation of spontaneous cerebrocortical activity by magnetoencephalography during a hyperinsulinemic euglycemic clamp and related it to measures of ectopic fat deposition and mediators of peripheral insulin resistance. Visceral fat mass and intrahepatic lipid content were quantified by magnetic resonance imaging and spectroscopy. Multiple regression analysis was used to analyze associations of cerebrocortical insulin sensitivity and metabolic markers related to obesity.


METHODS
Forty-nine healthy, nondiabetic humans participated in the study.


RESULTS
In a multiple regression, insulin-mediated stimulation of theta activity was negatively correlated to body mass index, visceral fat mass, and intrahepatic lipid content. Although fasting saturated nonesterified fatty acids mediated the correlations of theta activity with abdominal and intrahepatic lipid stores, adipocytokines displayed no independent correlation with insulin-mediated cortical activity in the theta frequency band.


CONCLUSIONS
Thus, insulin action at the level of cerebrocortical activity in the brain is diminished in the presence of elevated levels of saturated nonesterified fatty acids.
Tschritter
Otto
O
Department of Internal Medicine IV, University Hospital, University of Tübingen, 72076 Tübingen, Germany. otto.tschritter@med.uni-tuebingen.de
Preissl
Hubert
H
Hennige
Anita M
AM
Sartorius
Tina
T
Grichisch
Yuko
Y
Stefan
Norbert
N
Guthoff
Martina
M
Düsing
Stephan
S
Machann
Jürgen
J
Schleicher
Erwin
E
Cegan
Alexander
A
Birbaumer
Niels
N
Fritsche
Andreas
A
Häring
Hans-Ulrich
HU
D000273:Adipose Tissue / Q000378:metabolism; D000328:Adult; D001786:Blood Glucose / Q000378:metabolism; D002540:Cerebral Cortex / Q000187:drug effects / Q000502:physiology*; D005215:Fasting; D005230:Fatty Acids, Nonesterified / Q000097:blood*; D005260:Female; D015309:Glucose Clamp Technique; D006801:Humans; D006946:Hyperinsulinism; D007328:Insulin / Q000097:blood / Q000494:pharmacology*; D008055:Lipids / Q000502:physiology; D015225:Magnetoencephalography; D008297:Male; D009765:Obesity / Q000097:blood / Q000503:physiopathology; D013826:Theta Rhythm / Q000187:drug effects*; D049629:Waist-Hip Ratio
D001786:Blood Glucose; D005230:Fatty Acids, Nonesterified; D007328:Insulin; D008055:Lipids