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Title: Reduced expression of inducible gelatinase B/matrix metalloproteinase-9 in monocytes from patients with myelodysplastic syndrome: Correlation of inducible levels with the percentage of cytogenetically marked cells and with marrow cellularity
Authors: Iwata, Mineo ×
Pillai, Manoj
Ramakrishnan, Aravind
Hackman, Robert C
Joachim Deeg, H
Opdenakker, Ghislain
Torok-Storb, Beverly #
Issue Date: Jan-2007
Series Title: Blood vol:109 issue:1 pages:85-92
Abstract: Regulatory molecules produced by stromal cells are often membrane bound until cleaved by matrix metalloproteinases (MMPs); cleavage can either activate or inactivate regulatory functions. We report here that marrow stromal cells induce the expression of MMP-9 in monocytes. Induction was contact independent and could be reproduced with recombinant MCP-1/CCL2, whereas IL-6, M-CSF, G-CSF, GM-CSF, IL-8/CXCL8, SDF-1/CXCL12, and MGSA/CXCL1 did not have this effect. Stroma-induced levels of MMP-9 in the monocyte population from healthy donors were relatively consistent, whereas induced levels varied significantly (P < .001) in the CD14+ population from 27 patients with myelodysplastic syndrome (MDS). In patients with a clonal chromosomal marker, the level of inducible MMP-9 expression in the monocyte population was inversely correlated with the percentage of marker-positive cells (n = 11, P = .01), suggesting that the ability to induce MMP-9 may be compromised in clonally derived monocytes. The inducible levels of MMP-9 were also inversely correlated with marrow cellularity observed in biopsies from MDS patients (P < .001). We conclude that monocytes can express MMP-9 in response to stromal factors and that this response may be significantly decreased in MDS-derived monocytes.
URI: 
ISSN: 0006-4971
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Immunobiology (Rega Institute)
× corresponding author
# (joint) last author

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