Javier Lozano-Bartolomé1, Gemma Llauradó2,3, Manel Portero-Otin4, Antonio Altuna-Coy1, Gemma Rojo-Martínez2,5, Joan Vendrell1,2, Rosa Jorba6, Esther Rodríguez-Gallego7, Matilde R Chacón1. 1. Joan XXIII University Hospital, IISPV, Tarragona, Spain. 2. Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas, Madrid, Spain. 3. Department of Endocrinology and Nutrition, Hospital del Mar, Institut d'Investigacions Mèdiques, Barcelona, Spain. 4. Department of Experimental Medicine, Universitat de Lleida-IRBLleida, Lleida, Spain. 5. UGCI of Endocrinology and Nutrition, Instituto de Biomedicina de Málaga, Hospital Regional Universitario, Málaga, Spain. 6. Surgery Unit, Joan XXIII University Hospital, Tarragona, Spain. 7. Infectious Diseases and HIV/AIDS Unit, Department of Internal Medicine, Joan XXIII University Hospital, Universitat Rovira i Virgili, Tarragona, Spain.
Abstract
Context: The proinflammatory cytokine TNFα is a key player in insulin resistance (IR). The role of miRNAs in inflammation associated with IR is poorly understood. Objective: To investigate miR-181a-5p and miR-23a-3p expression profiles in obesity and to study their role in TNFα-induced IR in adipocytes. Design: Two separate cohorts were used. Cohort 1 was used in adipose tissue (AT) expression studies and included 28 subjects with body mass index (BMI) <30 kg/m2 and 30 with BMI ≥30 kg/m2. Cohort 2 was used in circulating serum miRNA studies and included 101 subjects with 4 years of follow-up (48 case subjects and 53 control subjects). miR-181a-5p and miR-23a-3p expression was assessed in subcutaneous and visceral AT. Functional analysis was performed in adipocytes, using miRNA mimics and inhibitors. Key molecules of the insulin pathway, AKT, PTEN, AS160, and S6K, were analyzed. Results: Expression of miR-181a-5p and miR-23a-3p was reduced in adipose tissue from obese and diabetic subjects and was inversely correlated to adiposity and homeostasis model assessment of IR index. Overexpression of miR-181a-5p and miR-23a-3p in adipocytes upregulated insulin-stimulated AKT activation and reduced TNFα-induced IR, regulating PTEN and S6K expression. Serum levels of miR-181a-5p were reduced in case vs control subjects at baseline, suggesting a prognostic value. Variable importance in projection scores revealed miR-181a-5p had more effect on the model than insulin or glucose at 120 minutes. Conclusion: miR-181a-5p and miR-23a-3p may prevent TNFα-induced IR in adipocytes through modulation of PTEN and S6K expression.
Context: The proinflammatory cytokine TNFα is a key player in insulin resistance (IR). The role of miRNAs in inflammation associated with IR is poorly understood. Objective: To investigate miR-181a-5p and miR-23a-3p expression profiles in obesity and to study their role in TNFα-induced IR in adipocytes. Design: Two separate cohorts were used. Cohort 1 was used in adipose tissue (AT) expression studies and included 28 subjects with body mass index (BMI) <30 kg/m2 and 30 with BMI ≥30 kg/m2. Cohort 2 was used in circulating serum miRNA studies and included 101 subjects with 4 years of follow-up (48 case subjects and 53 control subjects). miR-181a-5p and miR-23a-3p expression was assessed in subcutaneous and visceral AT. Functional analysis was performed in adipocytes, using miRNA mimics and inhibitors. Key molecules of the insulin pathway, AKT, PTEN, AS160, and S6K, were analyzed. Results: Expression of miR-181a-5p and miR-23a-3p was reduced in adipose tissue from obese and diabetic subjects and was inversely correlated to adiposity and homeostasis model assessment of IR index. Overexpression of miR-181a-5p and miR-23a-3p in adipocytes upregulated insulin-stimulated AKT activation and reduced TNFα-induced IR, regulating PTEN and S6K expression. Serum levels of miR-181a-5p were reduced in case vs control subjects at baseline, suggesting a prognostic value. Variable importance in projection scores revealed miR-181a-5p had more effect on the model than insulin or glucose at 120 minutes. Conclusion: miR-181a-5p and miR-23a-3p may prevent TNFα-induced IR in adipocytes through modulation of PTEN and S6K expression.
Authors: S Porro; V A Genchi; A Cignarelli; A Natalicchio; L Laviola; F Giorgino; S Perrini Journal: J Endocrinol Invest Date: 2020-11-03 Impact factor: 4.256
Authors: Mariam Haffa; Andreana N Holowatyj; Mario Kratz; Reka Toth; Axel Benner; Biljana Gigic; Nina Habermann; Petra Schrotz-King; Jürgen Böhm; Hermann Brenner; Martin Schneider; Alexis Ulrich; Esther Herpel; Peter Schirmacher; Beate K Straub; Johanna Nattenmüller; Hans-Ulrich Kauczor; Tengda Lin; Claudia R Ball; Cornelia M Ulrich; Hanno Glimm; Dominique Scherer Journal: J Clin Endocrinol Metab Date: 2019-11-01 Impact factor: 5.958