Journal
DIABETES CARE
Volume 33, Issue 5, Pages 1103-1108Publisher
AMER DIABETES ASSOC
DOI: 10.2337/dc09-2193
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Funding
- National Institutes of Health [R01-DK-069805, R01-DK-075877]
- American Diabetes Association [708CR13]
- Merck
- GlaxoSmithKline
- sanofi-aventis
- Amylin Pharmaceuticals
- NATIONAL INSTITUTE OF DIABETES AND DIGESTIVE AND KIDNEY DISEASES [R01DK075877, R01DK069805] Funding Source: NIH RePORTER
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OBJECTIVE - In view of the previously described anti-inflammatory effects of insulin, we investigated the potential suppressive effect of insulin on plasma concentrations and expression of the chemokines, monocyte chemoattractant protein-1 (MCP-1) and regulated on activation normal T-cell expressed and secreted (RANTES) and their receptors, chemokine receptor (CCR)-2 and CCR-5, in mononuclear cells (MNCs). We also investigated the effect of insulin on other chemokines. RESEARCH DESIGN AND METHODS - Ten obese type 2 diabetic patients were infused with insulin (2 units/h with 100 ml of 5% dextrose/h) for 4 h. Another 8 and 6 type 2 diabetic patients were infused with 100 ml of 5% dextrose/h or saline for 4 h, respectively, and served as control subjects. Blood samples were obtained at 0, 2, 4, and 6 h. RESULTS - Insulin infusion significantly suppressed the plasma concentrations of MCP-1, eotaxin, and RANTES and the expression of RANTES, macrophage inflammatory protein (MIP)-1 beta, CCR-2, and CCR-5 in MNCs at 2 and 4 h. Dextrose and saline infusions did not alter these indexes. CONCLUSIONS - A low-dose infusion of insulin suppresses the plasma concentration of key chemokines, MCP-1, and RANTES, and the expression of their respective receptors, CCR-2 and CCR-5, in MNCs. Insulin also suppresses the expression of RANTES and MIP-1 beta in MNCs. These actions probably contribute to the comprehensive anti-inflammatory effect of insulin.
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