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Background . The inflammatory markers YKL-40 and monocyte chemoattractant protein-1 (MCP-1) are elevated in morbidly obese patients and decline after weight loss. The objective of our study was to investigate the possible changes of YKL-40 and MCP-1, in both the fasting and the postprandial states, following Roux-en-Y gastric bypass (RYGB) in subjects with type 2 diabetes (T2D) and normal glucose tolerance (NGT).  Methods . Ten obese patients with T2D and 10 subjects with NGT were examined in the fasting state and after a standard meal prior to and after (1 week, 3 months, and 1 year) RYGB.  Results . Fasting state MCP-1 levels decreased after RYGB in both groups ( P  values < 0.0001) whereas fasting YKL-40 levels were unchanged ( P  values ≥ 0.120). Postprandial MCP-1 levels showed a tendency towards a decrease on most study days; however, the changes were only significant at 1 week ( P  = 0.001) and 1 yr ( P  < 0.0001) in the T2D group and at 3 mo after RYGB in the NGT group ( P  = 0.009). YKL-40 levels showed a slight, postprandial suppression on all study days in the T2D group (all  P  values ≤ 0.021).  Conclusions . Fasting MCP-1 levels, but not YKL-40 levels, decrease after RYGB in subjects with T2D and NGT. Postprandial changes of inflammatory markers are discrete and inconsistent.

journal of obesity

Effects of Roux-en-Y Gastric Bypass on Fasting and Postprandial Levels of the Inflammatory Markers YKL-40 and MCP-1 in Patients with Type 2 Diabetes and Glucose Tolerant Subjects