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Impact of obesity-associated diabetes mellitus on the development of hypothalamic gliosis in adolescents

Grant number: 17/00657-0
Support type:Scholarships abroad - Research
Effective date (Start): December 01, 2017
Effective date (End): November 30, 2018
Field of knowledge:Health Sciences - Medicine
Principal Investigator:Leticia Esposito Sewaybricker
Grantee:Leticia Esposito Sewaybricker
Host: Ellen Anne Schur
Home Institution: Fundação de Desenvolvimento da UNICAMP (FUNCAMP). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Local de pesquisa : University of Washington, United States  

Abstract

In experimental diet-induced obesity, the hypothalamus is affected by an inflammatory response that disturbs the function of key neurons involved in the regulation of caloric intake and energy expenditure. Advances in neuroimaging and the use of a quantitative magnetic resonance imaging (MRI) allowed the detection of radiological signs of gliosis in the medial basal hypothalamus (MBH). In both animal models and adults with obesity this finding is directly related to a higher body mass index (BMI). Childhood obesity is a risk factor for obesity in adults as well as the development of comorbidities. Our recent study showed that radiological signs of hypothalamic gliosis are already present in obese children and adolescents and those signs are correlated to a higher percentage of abdominal body fat-the component of body fat that is more closely related to a high metabolic risk. Recent findings also show that hypothalamic gliosis in adults is associated with insulin resistance, independent of BMI. However, no previous study has verified whether changes in hypothalamic tissue characteristics are related to glucose metabolism in children. This study aims to assess if the early onset of diabetes or insulin resistance in children is related to hypothalamic gliosis development. For this, a quantitative MRI approach will be used to assess for the presence of MBH gliosis on 12 obese children with DM2, 12 obese without DM2, and 12 normal-weight participants. Fasting glucose and insulin levels, dietary recalls and level of physical activity will also be evaluated. This study may increase the knowledge on hypothalamic dysfunction in obesity and its relation to insulin resistance and body energy homeostasis. (AU)