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J Biol Chem, Vol. 274, Issue 17, 11924-11929, April 23, 1999

Inflammatory Cytokines and Oxidized Low Density Lipoproteins Increase Endothelial Cell Expression of Membrane Type 1-Matrix Metalloproteinase

Tripathi B. RajavashisthDagger §, James K. Liao, Zorina S. Galis, Sangeetika Tripathi§, Ulrich Laufs, Jagannath Tripathi§, Ning-Ning ChaiDagger , Xiao-Ping XuDagger , Stefan JovingeDagger , Prediman K. ShahDagger , and Peter Libby

From the Dagger  Atherosclerosis Research Center, Division of Cardiology, Cedars-Sinai Medical Center, UCLA School of Medicine, Los Angeles, California 90048, the § Harbor-UCLA Medical Center, Torrance, California 90502, and the  Vascular Medicine and Atherosclerosis Unit, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115

We investigated whether inflammatory cytokines or oxidized low density lipoproteins (Ox-LDL) present in human atheroma modulate extracellular matrix degradation by inducing membrane type 1-matrix metalloproteinase (MT1-MMP) expression. Cultured human endothelial cells (EC) constitutively expressed MT1-MMP mRNA and protein with enzymatic activity. Tumor necrosis factor-alpha (TNF-alpha ), interleukin-1alpha , or interleukin-1beta caused a time-dependent increase in the steady-state MT1-MMP mRNA levels within 4 h of exposure, peaking about 4-fold by 6 h, and remaining elevated for 12 h. Increased MT1-MMP mRNA correlated with a 2.5-fold increase in MT1-MMP protein in EC membranes. Ox-LDL also increased MT1-MMP mRNA levels that varied with the duration of exposure and degree of LDL oxidation. The increase in MT1-MMP mRNA occurred within 6 h of exposure to Ox-LDL and peaked over 3-fold by 6 h. Ox-LDL, but not native LDL, increased MT1-MMP protein by 2-fold in EC membranes. A combination of TNF-alpha and Ox-LDL was additive in increasing MT1-MMP expression. Nuclear run-on assays showed that TNF-alpha or Ox-LDL augmented steady-state mRNA levels by increased transcription of the MT1-MMP gene. These findings indicate that activation of EC by inflammatory cytokines and/or Ox-LDL increase MT1-MMP expression. Since MT1-MMP promotes matrix degradation by activating pro-MMP-2, these results suggest a novel mechanism whereby cytokines or Ox-LDL may influence extracellular matrix remodeling.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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