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Utility of combining MMP-9 enzyme-linked immunosorbent assay and MMP-9 activity assay data to monitor plasma enzyme specific activity
The aim of this study was to combine matrix metalloproteinase-9 (MMP-9) protein (enzyme-linked immunosorbent assay [ELISA]) and MMP-9 activity (fluorescence resonance energy transfer [FRET] assay) data to generate units of specific activity in endogenous and p-aminophenylmercuric acetate (APMA)-acti...
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Published in: | Analytical biochemistry 2010-09, Vol.404 (2), p.232-234 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The aim of this study was to combine matrix metalloproteinase-9 (MMP-9) protein (enzyme-linked immunosorbent assay [ELISA]) and MMP-9 activity (fluorescence resonance energy transfer [FRET] assay) data to generate units of specific activity in endogenous and
p-aminophenylmercuric acetate (APMA)-activated lithium heparin plasma. The results indicate that specific activity is constant in APMA-activated plasma (mean value
=
1359.4
pmol/min/μg) and approximately 12% plasma MMP-9 is endogenously active. Exogenous tissue inhibitor of metalloproteinase-1 (TIMP-1) has a greater inhibitory effect on endogenously active MMP-9 than on APMA-activated MMP-9. In conclusion, specific activity can be used as a tool to monitor MMP-9 inhibition. APMA activation affects natural enzyme inhibition, possibly by chemical modification of the C-terminal portion of the enzyme containing the TIMP-1 binding site. |
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ISSN: | 0003-2697 1096-0309 |
DOI: | 10.1016/j.ab.2010.05.020 |