Abstract
To measure matrix metalloproteinase (MMP) activity in a large number of samples it is advisable to use easily automated methods. We have evaluated and compared the activity of stromelysin-1 (MMP-3), matrilysin (MMP-7), 72 kDa gelatinase A (MMP-2) and 92 kDa gelatinase B (MMP-9) by zymogram analysis and fluorescent substrate degradation assays. FITC-casein and the fluorogenic peptide Dnp-Pro-β-cyclohexyl-Ala-Gly-Cys(Me)-His-Ala-Lys-(N-Me-Abz)-NH were used as fluorescent substrates. FITC-casein was more efficiently degraded than the fluorogenic peptide by all MMPs tested except MMP-9. MMP-2 was not significantly able to degrade the fluorogenic peptide. Gelatin zymography was the most sensitive method to detect the activity of both gelatinases but quantitation problems compromise its use. The degradation of fluorogenic substrates by MMPs could be inhibited by the chelating agent EDTA and by the tissue inhibitor of metalloproteinases 2 (TIMP-2), an MMP-specific inhibitor. Fluorometric methods represent a good alternative for MMP activity measurement, especially when a large number of samples must be processed.
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Quesada, A.R., Mar Barbacid, M., Mira, E. et al. Evaluation of fluorometric and zymographic methods as activity assays for stromelysins and gelatinases. Clin Exp Metastasis 15, 26–32 (1997). https://doi.org/10.1023/A:1018480222301
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DOI: https://doi.org/10.1023/A:1018480222301