Details

Autor(en) / Beteiligte

• BOUMA, Gerben
• LAM-TSE, Wai Kwan
• WIERENGA-WOLF, Annet F
• DREXHAGE, Hemmo A
• VERSNEL, Marjan A

Titel

Increased Serum Levels of MRP-8/14 in Type 1 Diabetes Induce an Increased Expression of CD11b and an Enhanced Adhesion of Circulating Monocytes to Fibronectin

Ist Teil von

• Diabetes (New York, N.Y.), 2004-08, Vol.53 (8), p.1979-1986

Ort / Verlag

Alexandria, VA: American Diabetes Association

Erscheinungsjahr

2004

Quelle

MEDLINE

Beschreibungen/Notizen

• Increased Serum Levels of MRP-8/14 in Type 1 Diabetes Induce an Increased Expression of CD11b and an Enhanced Adhesion of Circulating Monocytes to Fibronectin Gerben Bouma , Wai Kwan Lam-Tse , Annet F. Wierenga-Wolf , Hemmo A. Drexhage and Marjan A. Versnel From the Department of Immunology, Erasmus MC, Rotterdam, the Netherlands Address correspondence and reprint requests to Dr. Gerben Bouma, Dept. of Immunology, Erasmus MC, P.O. Box 1738, 3000 DR Rotterdam, Netherlands. E-mail: g.bouma{at}erasmusmc.nl Abstract The recruitment of monocytes from the bloodstream is crucial in the accumulation of macrophages and dendritic cells in type 1 diabetic pancreases. Adhesion via integrins to endothelium and extracellular matrix proteins, such as fibronectin (FN), and the production of myeloid-related protein (MRP)-8, -14, and -8/14 by recently transmigrated monocytes are thought to be instrumental in such recruitment. We determined the FN-adhesive capacity and integrin expression of monocytes of type 1 and type 2 diabetic patients and related them to the subjects’ serum levels of MRP-8, -14 and -8/14. Monocytes of type 1 diabetic patients displayed an increased adhesion to fibronectin in comparison with type 2 patients and healthy control subjects but had a normal expression of the FN binding integrins CD29, CD49a, CD49d, and CD49e (although CD11b and CD18 expression was increased). MRP-8/14, which was increased in the sera of type 1 diabetic patients, induced healthy donor monocytes to adhere to FN and upregulate CD11b expression in a dosage-dependent manner. The observed MRP-induced increased adhesion of monocytes to FN and upregulation of CD11b most likely contributed to a facilitated accumulation of monocytes and monocyte-derived cells at the site of inflammation, in this case the pancreatic islets. APC, antigen-presenting cell DC, dendritic cell ECM, extracellular matrix ELISA, enzyme-linked immunosorbent assay fMLP, N-formyl-methionyl-leucyl-phenylalanine FN, fibronectin IL, interleukin LFA-1, leukocyte function antigen-1 MRP, myeloid-related protein NF-κB, nuclear factor-κB VLA, very late antigen Footnotes Accepted April 29, 2004. Received November 12, 2003. DIABETES