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Title: Association of Body Mass and Brain Activation during Gastric Distention: Implications for Obesity

Journal Article · · PLoS ONE
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [6];  [7];  [6]
  1. National Institutes of Health (NIH), Bethesda, MD (United States); DOE/OSTI
  2. Brookhaven National Laboratory (BNL), Upton, NY (United States); Icahn School of Medicine at Mount Sinai, New York, NY (United States)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States).
  4. State University of New York (SUNY), Stony Brook, NY (United States)
  5. Columbia University, New York, NY (United States)
  6. National Institutes of Health (NIH), Bethesda, MD (United States)
  7. Brookhaven National Laboratory (BNL), Upton, NY (United States).; Icahn School of Medicine at Mount Sinai, New York, NY (United States)

Gastric distention (GD), as it occurs during meal ingestion, signals a full stomach and it is one of the key mechanisms controlling food intake. Previous studies on GD showed lower activation of the amygdala for subjects with higher body mass index (BMI). Since obese subjects have dopaminergic deficits that correlate negatively with BMI and the amygdala is innervated by dopamine neurons, we hypothesized that BMI would correlate negatively with activation not just in the amygdala but also in other dopaminergic brain regions (midbrain and hypothalamus). We used functional magnetic resonance imaging (fMRI) to evaluate brain activation during GD in 24 healthy subjects with BMI range of 20–39 kg/m2 . Using multiple regression and cross-correlation analyses based on a family-wise error corrected threshold P = 0.05, we show that during slow GD to maximum volumes of 500 ml and 700 ml subjects with increased BMI had increased activation in cerebellum and left posterior insula, and decreased activation of dopaminergic (amygdala, midbrain, hypothalamus, thalamus) and serotonergic (pons) brain regions and anterior insula, regions that were functionally interconnected with one another. The negative correlation between BMI and BOLD responses to gastric distention in dopaminergic (midbrain, hypothalamus, amygdala, thalamus) and serotonergic (pons) brain regions is consistent with disruption of dopaminergic and serotonergic signaling in obesity. In contrast the positive correlation between BMI and BOLD responses in posterior insula and cerebellum suggests an opposing mechanism that promotes food intake in obese subjects that may underlie their ability to consume at once large food volumes despite increasing gastric distention.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
National Center for Research Resources (NCRR); National Institute on Drug Abuse; National Institutes on Alcoholism and Alcohol Abuse; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0012704
OSTI ID:
1627383
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 8 Vol. 4; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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Mood Disorders and Obesity: Understanding Inflammation as a Pathophysiological Nexus journal December 2010
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Prefronto-cerebellar neuromodulation affects appetite in obesity journal December 2018
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Beyond Pharmacotherapy: Understanding the Links between Obesity and Chronic Mental Illness journal January 2012
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