Rebeca Ortega1,2, Luisa Hueso1,2, Esther Benito1,3,4, Joaquín Ortega5,6, Miguel Civera1,3, Maria-Jesus Sanz7,8,9, José T Real10,11,12, Laura Piqueras13,14,15. 1. Institute of Health Research-INCLIVA, Valencia, Spain. 2. Department of Pharmacology, Faculty of Medicine, University of Valencia, Valencia, Spain. 3. Endocrinology and Nutrition Service, University Clinic Hospital of Valencia, Valencia, Spain. 4. CIBERDEM: Diabetes and Associated Metabolic Diseases Networking Biomedical Research- ISCIII, Madrid, Spain. 5. Surgery Service, University Clinic Hospital of Valencia, Valencia, Spain. 6. Department of Surgery, University of Valencia, Valencia, Spain. 7. Institute of Health Research-INCLIVA, Valencia, Spain. maria.j.sanz@uv.es. 8. Department of Pharmacology, Faculty of Medicine, University of Valencia, Valencia, Spain. maria.j.sanz@uv.es. 9. CIBERDEM: Diabetes and Associated Metabolic Diseases Networking Biomedical Research- ISCIII, Madrid, Spain. maria.j.sanz@uv.es. 10. Institute of Health Research-INCLIVA, Valencia, Spain. jose.t.real@uv.es. 11. Endocrinology and Nutrition Service, University Clinic Hospital of Valencia, Valencia, Spain. jose.t.real@uv.es. 12. CIBERDEM: Diabetes and Associated Metabolic Diseases Networking Biomedical Research- ISCIII, Madrid, Spain. jose.t.real@uv.es. 13. Institute of Health Research-INCLIVA, Valencia, Spain. piqueras_lau@gva.es. 14. Department of Pharmacology, Faculty of Medicine, University of Valencia, Valencia, Spain. piqueras_lau@gva.es. 15. CIBERDEM: Diabetes and Associated Metabolic Diseases Networking Biomedical Research- ISCIII, Madrid, Spain. piqueras_lau@gva.es.
Abstract
BACKGROUND/AIMS: Inflammation governs adipose tissue (AT) dysfunction in obesity. Retinoic acid receptor-related orphan receptor alpha (RORα) is associated with inflammation and insulin resistance in animal studies, but its role in human obesity remains elusive. We investigated the expression and function of RORα on AT inflammation in patients with morbid obesity with/without diabetes. SUBJECTS/ METHODS: We assessed RORα expression in paired biopsies of subcutaneous and omental AT from 41 patients (body mass index (BMI) 43.3 ± 0.8 kg/m2) during Roux-en-Y-gastric surgery and explored the functional consequences of pharmacological RORα blockade in AT ex vivo. RESULTS: RORα expression was significantly higher in omental AT than in subcutaneous AT (p = 0.03) and was positively associated with BMI (r = 0.344, p = 0.027) and homeostasis model assessment of insulin resistance (r = 0.319, p = 0.041). In ex vivo assays, IL-8/CXCL8 and MCP-1/CCL2 chemokine release was significantly higher in omental fat explants from diabetic patients than from non-diabetics and was significantly diminished by RORα blockade (p < 0.05). Inhibition of RORα improved protein kinase B signaling and decreased NF-κB activity in omental AT from patients with diabetes (p < 0.05). Under dynamic flow conditions, RORα blockade prevented mononuclear cell attachment to human dysfunctional endothelial cells. CONCLUSIONS: RORα blockade represents a potential therapy to prevent AT dysfunction and inflammation associated with insulin resistance in human obesity.
BACKGROUND/AIMS: Inflammation governs adipose tissue (AT) dysfunction in obesity. Retinoic acid receptor-related orphan receptor alpha (RORα) is associated with inflammation and insulin resistance in animal studies, but its role in human obesity remains elusive. We investigated the expression and function of RORα on AT inflammation in patients with morbid obesity with/without diabetes. SUBJECTS/ METHODS: We assessed RORα expression in paired biopsies of subcutaneous and omental AT from 41 patients (body mass index (BMI) 43.3 ± 0.8 kg/m2) during Roux-en-Y-gastric surgery and explored the functional consequences of pharmacological RORα blockade in AT ex vivo. RESULTS: RORα expression was significantly higher in omental AT than in subcutaneous AT (p = 0.03) and was positively associated with BMI (r = 0.344, p = 0.027) and homeostasis model assessment of insulin resistance (r = 0.319, p = 0.041). In ex vivo assays, IL-8/CXCL8 and MCP-1/CCL2 chemokine release was significantly higher in omental fat explants from diabetic patients than from non-diabetics and was significantly diminished by RORα blockade (p < 0.05). Inhibition of RORα improved protein kinase B signaling and decreased NF-κB activity in omental AT from patients with diabetes (p < 0.05). Under dynamic flow conditions, RORα blockade prevented mononuclear cell attachment to human dysfunctional endothelial cells. CONCLUSIONS: RORα blockade represents a potential therapy to prevent AT dysfunction and inflammation associated with insulin resistance in human obesity.
Authors: Aida Collado; Patrice Marques; Paula Escudero; Cristina Rius; Elena Domingo; Sergio Martinez-Hervás; José T Real; Juan F Ascaso; Laura Piqueras; Maria-Jesus Sanz Journal: Cardiovasc Res Date: 2018-11-01 Impact factor: 10.787
Authors: B A Hamilton; W N Frankel; A W Kerrebrock; T L Hawkins; W FitzHugh; K Kusumi; L B Russell; K L Mueller; V van Berkel; B W Birren; L Kruglyak; E S Lander Journal: Nature Date: 1996-02-22 Impact factor: 49.962