Adiponectin Signaling and Impaired GTPase Rab5 Expression in Adipocytes of Adolescents with Obesity
| Autor: | Bessie E. Spiliotis, Aikaterini Avgeri, Eirini Kostopoulou, Jesús Argente, Andrea Paola Rojas Gil, George Lambrinidis, Ioannis Dimopoulos, George Georgiou, Aliki Pappa, Alexia Karvela, Vicente Barrios |
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| Rok vydání: | 2020 |
| Předmět: |
Male
medicine.medical_specialty Pediatric Obesity Adolescent Endocrinology Diabetes and Metabolism Primary Cell Culture Abdominal Fat Adipose tissue Adipokine chemistry.chemical_compound Endocrinology Internal medicine Adipocyte Adipocytes Medicine Humans Receptor Child Adaptor Proteins Signal Transducing rab5 GTP-Binding Proteins Adiponectin business.industry Leptin Infant medicine.disease Obesity chemistry Case-Control Studies Child Preschool Pediatrics Perinatology and Child Health Female Signal transduction Receptors Adiponectin business Signal Transduction |
| Zdroj: | Hormone research in paediatrics. 93(5) |
| ISSN: | 1663-2826 |
| Popis: | Introduction: Abnormalities in adipose tissue AdipoR1; adaptor protein, phosphotyrosine interaction, PH domain, and leucine zipper containing 1 (APPL1); GTPase Rab5; adiponectin; leptin; and visfatin in adults with obesity have been associated with metabolic disturbances. Objective: The objective of this study was to examine whether pediatric obesity disrupts elements of the adiponectin signaling pathway and GTPase Rab5 in adipose tissue. Methods: Primary adipocyte cultures of subcutaneous abdominal tissue were obtained from 96 lean and 66 children and adolescents with obesity (AO). AdipoR1, APPL1, and GTPase Rab5 mRNA levels were measured by RT-PCR and their protein content by Western immunoblotting. Serum total and high-molecular-weight adiponectin, leptin, leptin soluble receptor (sOB-R), and visfatin were measured by ELISA. Results: The mRNA expression and protein content of AdipoR1 and APPL1 did not differ significantly with obesity, age, or puberty. However, GTPase Rab5 protein was increased in the adipocytes of younger prepubertal children with obesity but decreased in AO. Leptin was increased in AO compared to lean adolescents (AL) and in older prepubertal lean (OPL) children and AL compared to younger prepubertal lean and obese children. sOB-R was higher in OPL children and in the AL and AO. Serum visfatin was increased in the younger prepubertal children and AO. Conclusions: In contrast to adults, obesity did not change the expression of AdipoR1 and APPL1 in cultured adipocytes from biopsies of subcutaneous abdominal adipose tissue of children and adolescents. Similar to adipose tissue studies in adults with obesity and metabolic dysfunction, the AO in our study showed reduced adipocyte GTPase Rab5 expression. |
| Databáze: | OpenAIRE |
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