1. Initial evidence for hypothalamic gliosis in children with obesity by quantitative T2 MRI and implications for BOLD response to glucose ingestion
- Author
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Sewaybricker, Leticia E., Schur, Ellen A., Melhorn, Susan J., Campos, Brunno M., Askren, Mary K., Nogueira, Guilherme A. S., Zambon, Mariana P., Antonio, Maria Angela R. G. M., Cendes, Fernando, Velloso, Licio A., and Guerra-Junior, Gil
- Subjects
Male ,Oxygen ,Eating ,Pediatric Obesity ,Glucose ,Adolescent ,Hypothalamus ,Humans ,Female ,Gliosis ,Child ,Magnetic Resonance Imaging ,Article - Abstract
OBJECTIVE: In adults, hypothalamic gliosis has been documented using quantitative T2 neuroimaging whereas functional magnetic resonance imaging (fMRI) has shown a defective hypothalamic response to nutrients. No studies have yet evaluated these hypothalamic abnormalities in children with obesity. METHODS: Children with obesity and lean controls underwent quantitative MRI measuring T2 relaxation time, along with continuous hypothalamic fMRI acquisition to evaluate early response to glucose ingestion. RESULTS: Children with obesity (N=11) had longer T2 relaxation times, consistent with gliosis, in the mediobasal hypothalamus (MBH) compared to controls (N=9; p=0.004). Moreover, there was a highly significant group*region interaction (p=0.002), demonstrating that signs of gliosis were specific to MBH and not to reference regions. Longer T2 relaxation times correlated with measures of higher adiposity including visceral fat percentage (p=0.01). Mean glucose-induced hypothalamic BOLD signal change did not differ between groups (p=0.11). However, mean left MBH T2 relaxation time negatively correlated with glucose-induced hypothalamic signal change (p
- Published
- 2018