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Proteolytic shedding of the macrophage scavenger receptor CD163 in multiple sclerosis

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Author: Fabriek, B.O. · Møller, H.J. · Vloet, R.P.M. · Winsen, L.M. van · Hanemaaijer, R. · Teunissen, C.E. · Uitdehaag, B.M.J. · Berg, T.K. van den · Dijkstra, C.D.
Type:article
Date:2007
Institution: TNO Kwaliteit van Leven
Source:Journal of Neuroimmunology, 1-2, 187, 179-186
Identifier: 240067
doi: doi:10.1016/j.jneuroim.2007.04.016
Keywords: Health · Biomedical Research · CD163 · Metalloproteinase · Monocytes · Multiple sclerosis · Scavenger receptor · sCD163 · CD163 antigen · cytokine · gelatinase B · scavenger receptor · adult · aged · analytic method · article · comparative study · controlled study · cytokine production · down regulation · enzyme activity · female · human · major clinical study · male · multiple sclerosis · priority journal · protein degradation · upregulation · Adolescent · Adult · Aged · Aged, 80 and over · Animals · Antigens, CD · Antigens, Differentiation, Myelomonocytic · Cell Line, Transformed · Cricetinae · Cricetulus · Cytokines · Enzyme Inhibitors · Enzyme-Linked Immunosorbent Assay · Female · Humans · Hydrocortisone · Male · Matrix Metalloproteinase 2 · Matrix Metalloproteinase 9 · Middle Aged · Multiple Sclerosis · Receptors, Cell Surface · Statistics, Nonparametric · Transfection

Abstract

The scavenger receptor CD163 is selectively expressed on tissue macrophages and human monocytes. CD163 has been implicated to play a role in the clearance of hemoglobin and in the regulation of cytokine production by macrophages. Membrane CD163 can be cleaved by matrix metalloproteinases (MMP) resulting in soluble CD163 (sCD163). In the present report the shedding of CD163 was investigated in multiple sclerosis (MS). An upregulation of plasma sCD163 and a down regulation of membrane CD163 in MS patients compared to healthy controls was observed. The levels of plasma sCD163 correlated with plasma MMP-9 levels in controls, but not in MS patients. Moreover, evidence was obtained for CD163-cleaving MMP activity in plasma of MS patients. Finally, the increased proteolytic shedding of CD163 correlated to reduced plasma levels of circulating inflammatory cytokines. Collectively, our results provide evidence for proteolytic shedding of CD163 in MS and suggest a possible link to cytokine production. © 2007 Elsevier B.V. All rights reserved.