Abstract
Glomerulosclerosis is characterized by an accumulation of mesangial extracellular matrix. Oxygen radicals are strongly implicated in glomerular injury but it is unclear by what mechanism they could modulate matrix turnover dynamics. We evaluated whether oxidation of the 72 kD mesangial matrix metalloproteinase-2 (MMP-2), the major mesangial matrix-degrading enzyme, could alter its gelatinolytic activity. Oxidation of the MMP-2 using a FeCl3/ascorbate system resulted in impaired ability to degrade [3H]gelatin compared to control. Samples were also subjected to SDS-PAGE gelatin substrate zymography. At the 72 kD position a significant impairment of gelatinolytic activity of oxidized samples was observed, a decrease attenuated by coincubation of samples with the FeCl3/ascorbate system plus the radical spin trap N-tert-butyl-α-phenylnitrone suggesting specificity of oxidative changes in the decrease in enzymatic activity. These data represent the first report demonstrating that oxidation of the MMP-2 diminishes its activity and suggest a previously undescribed mechanism by which oxygen radicals may contribute to altered turnover of extracellular matrix.
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Mattana, J., Margiloff, L., Sharma, P. et al. Oxidation of the Mesangial Matrix Metalloproteinase-2 Impairs Gelatinolytic Activity. Inflammation 22, 269–276 (1998). https://doi.org/10.1023/A:1022396015294
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DOI: https://doi.org/10.1023/A:1022396015294