Differences in the redox status of human visceral and subcutaneous adipose tissues – relationships to obesity and metabolic risk
| Autor: | Biljana Buzadzic, Milica Vucetic, Aleksandra Korac, Bato Korac, Vesna Otasevic, Milica Markelic, Igor Golic, Aleksandra Jankovic, Ksenija Velickovic, Biljana Srdic-Galic, Ana Stancic |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Adult
medicine.medical_specialty Endocrinology Diabetes and Metabolism Glutathione reductase Ideal Body Weight Subcutaneous Fat Adipose tissue 030209 endocrinology & metabolism Intra-Abdominal Fat 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Endocrinology Insulin resistance Risk Factors Internal medicine Adipocyte medicine Humans Obesity 030304 developmental biology Metabolic Syndrome 2. Zero hunger Aldehydes 0303 health sciences NADPH oxidase Triglyceride biology nutritional and metabolic diseases Middle Aged medicine.disease Metabolic syndrome 3. Good health Metabolism chemistry Redox regulation Case-Control Studies Lipogenesis biology.protein Female Oxidation-Reduction |
| Zdroj: | Metabolism-Clinical and Experimental |
| ISSN: | 0026-0495 |
| DOI: | 10.1016/j.metabol.2014.01.009 |
| Popis: | Objective. Metabolic homeostasis depends on adipocyte metabolic responses/processes, most of which are redox-regulated. Besides, visceral and subcutaneous adipose tissues (VAT and SAT, respectively) differ metabolically and in their contribution to metabolic complications, but their redox characteristics in humans are still unknown. To understand the molecular mechanisms of metabolic syndrome development, we analysed the redox characteristics of VAT and SAT in groups with various body weights and metabolic risks. Material and Methods. Fifty premenopausal women were classified according to body mass index into normal-weight and obese groups, and these groups were further sub-classified into metabolically healthy and metabolically obese ({''}at risk{''}) based on the homeostasis model assessment of insulin resistance (HOMA-IR) index and the triglyceride, total-, LDL- and HDL-cholesterol levels. Antioxidant components, NADPH oxidase protein and 4-hydroxynonenal (4-HNE) levels were analysed in VAT and SAT. Results. Compared with the SAT, the VAT showed a higher basal level of glutathione (GSH) and GSH-dependent enzyme activities. Compared with the metabolically healthy normal-weight controls, the obese groups of women showed lower GSH levels in both depots. However, in these groups, additional prooxidative changes (increased NADPH oxidase and 4-HNE and decreased levels of SOD and/or CAT) were observed only in VAT. Conclusions. Because of the critical role of thiol-redox homeostasis in lipogenesis, interdepot-differences in the GSH-dependent antioxidant part may be connected to the higher metabolic activity found in VAT. Analogously, the lower GSH levels that occur during obesity and the corresponding additional redox imbalance may be signs of VAT metabolic dysfunction that underlie the subsequent metabolic impairment. (C) 2014 Elsevier Inc. All rights reserved. Ministry of Education, Science and Technological Development of the Republic of Serbia {[}173054, 173055] |
| Databáze: | OpenAIRE |
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