Postprandial Platelet Activation Is Related to Postprandial Plasma Insulin Rather Than Glucose in Patients With Type 2 Diabetes
- 1Department of Medicine Solna, Clinical Pharmacology Unit, Karolinska University Hospital-Solna, Stockholm, Sweden
- 2Department of Hematology, Coagulation Unit, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
- 3Department of Molecular Medicine and Surgery, Endocrinology & Diabetology Unit, Karolinska Institutet, Karolinska University Hospital-Solna, Stockholm, Sweden
- Corresponding author: Paul Hjemdahl, .
Postprandial hyperglycemia is associated with platelet activation. We thus investigated if meal-induced platelet activation could be attenuated by meal insulin. A randomized, double-blind, cross-over study was performed to compare postprandial platelet activation after premeal injections of placebo or insulin aspart (0.1 and 0.2 units/kg) in 18 patients with type 2 diabetes mellitus (T2DM). Platelet activation was assessed by flow cytometry, without and with stimulation by the thromboxane analog U46619 or ADP. Measurements were before and after premeal blood glucose standardization (to 6–7 mmol/L by insulin infusion, if needed) and at 90 min after the meal. Premeal insulin reduced postprandial hyperglycemia by 2–3 mmol/L compared with placebo. Postmeal insulin levels were doubled with placebo and further elevated with insulin injections. The standardized meal enhanced U46619-induced platelet P-selectin expression by 23% after placebo; this response was more than doubled after premeal insulin. U46619-induced fibrinogen binding was unchanged after meal intake with placebo but was markedly enhanced (by ∼50–60%) after premeal insulin. Postprandial platelet activation correlated positively to postprandial insulin levels and inversely to glucose levels. Premeal insulin infusion was also associated with platelet activation. Our results suggest that postprandial insulin rather than glucose accounts for postprandial platelet activation in T2DM patients.
- Received January 9, 2012.
- Accepted March 21, 2012.
- © 2012 by the American Diabetes Association.
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