Circulating tumor necrosis factor-α (TNF-α) (RAB0479), interleukin-1β (IL-1β) (RAB0277), insulin (RAB0904) (all from SIGMA Aldrich, St. Louis, MO, USA), leptin (ab100773), and adiponectin (ab108784) (Abcam, USA) were performed using commercially available kits according to the manufacturer′s instructions.
Blood glucose concentrations were measured using a glucose meter (Roche Diagnostics GmbH, Mannheim, Germany). The HOMA-IR (Homeostasis model assessment of insulin resistance) index was calculated as [fasting glucose (mg/dl) × fasting insulin (ng/ml)/405] to assess insulin resistance [38 (link)].