Effects of chronic abdominal vagal stimulation of small-diameter neurons on brain metabolism and food intake.

Abstract:

BACKGROUND:Abdominal bilateral vagal stimulation reduces food intake in animals. However, the classical square wave, mA range current generator is poorly effective to evoke action potentials on A∂ and C neurons that represent the majority of vagal neurons at the abdominal level. OBJECTIVE/HYPOTHESIS:METHODS: The current thresholds for pulsons (S2 & S3) and millisecond pulses (S1) required to trigger action potentials were calculated in 5 anaesthetized pigs using single fibre recording. Similar stimulation protocols were compared chronically to sham stimulation in 24 pigs. After two weeks of chronic stimulation, food intake and brain metabolism were investigated. The electrical characteristics and histology of the vagus nerve were also studied. RESULTS:S3 stimulation required a lower amount of charges to trigger an action potential. Chronically applied S2 & S3 activated the dorsal vagal complex and increased the metabolism of its afferent cortical structures. They also reduced energy intake together with a reduced ingestion of high fat and high sugar diets. All these effects were not observed for the S1 group. The vagal histology for the S1, S2 and S3 groups was not different from that of the sham. CONCLUSIONS:These findings demonstrate that pulsons applied bilaterally on the abdominal vagus reduced food intake as a consequence of the activation of the brainstem and higher-order brain areas.

journal_name

Brain Stimul

journal_title

Brain stimulation

authors

Malbert CH,Bobillier E,Picq C,Divoux JL,Guiraud D,Henry C

doi

10.1016/j.brs.2017.04.126

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

735-743

issue

4

eissn

1935-861X

issn

1876-4754

pii

S1935-861X(17)30787-8

journal_volume

10

pub_type

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