Urinary Serine Protease
Urinary Serine Protease - Related Videos
02:59
An In Vitro Assay for Measuring Neutrophil Serine Protease Activity Using a Fluorescent Reporter
0 Views •
2025
This video demonstrates an in vitro assay to quantify neutrophil serine protease activity in sputum samples. The sample containing secreted protease is incubated with a fluorescent reporter bearing a recognition motif. Cleavage of the motif by the protease enables individual fluorescence emission by the donor and acceptor fluorophore of the reporter, indicating protease activity in the sample.
09:00
Use of the Protease Fluorescent Detection Kit to Determine Protease Activity
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Cited by 15 •
2009
The Protease Fluorescent Detection Kit is designed for the measurement of protease activity using fluorometry. It is also suitable for detection of trace amounts of protease contamination. The method is based on the proteolytic hydroysis of a proprietary formulation of a FITC-labeled casein substrate.
05:05
A Modified Precipitation Method to Isolate Urinary Exosomes
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Cited by 32 •
2015
This manuscript describes a protocol for isolating exosomes from human urine using a modified precipitation technique.
11:37
Sigma's Non-specific Protease Activity Assay - Casein as a Substrate
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Cited by 414 •
2008
Proteases break peptide bonds. In the lab, it is often necessary to measure and/or compare the activity of proteases. Sigma's non-specific protease activity assay may be used as a standardized procedure to determine the activity of proteases.
03:47
Methylene Blue Dye Injection in Mouse Embryonic Urinary Tract: A Method To Assess the Congenital Obstruction in the Urinary Tract
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2025
In this video, we administer methylene blue dye injection into the urinary tract of a perinatal embryonic mouse to assess congenital anomalies related to urinary tract obstruction.
FAQs
Their catalytic activity depends on a serine residue positioned within the active site. Histidine and aspartate typically cooperate with that serine to activate water, enabling hydrolysis of target proteins. This catalytic arrangement explains why changes in active-site function can alter proteolytic activity even when the amount of enzyme present in urine does not change.
A urinary enzyme may originate from renal tissue, the urinary tract, or filtered plasma proteins. Identifying the likely source helps investigators relate a measured signal to kidney physiology, urinary-tract processes, or changes in filtration. This distinction is important when interpreting urinary protease findings in studies of inflammation, tissue injury, or disease.
Abundance describes how much enzyme is detected, whereas activity reflects its ability to cleave peptide bonds. These measurements can provide complementary information because catalytic performance depends on the active site and its supporting residues. Comparing both readouts may help distinguish increased enzyme presence from altered proteolytic function during disease-related changes.
Investigators may examine the amount of urinary serine protease, its proteolytic activity, or both. The resulting measurements can be related to kidney and urinary-tract physiology and assessed for changes associated with inflammation, tissue injury, or disease. This supports biomarker research by connecting a measurable urinary signal with underlying biological processes.
They are useful when researchers need to investigate proteolytic pathways or search for indicators of renal and urinary-tract changes. Altered abundance or activity can be examined in relation to inflammation, tissue injury, and disease. Such studies may help evaluate whether these enzymes have diagnostic value or could inform development of therapeutic strategies.
Measurements of urinary serine proteases can provide information about disease-associated changes in proteolytic activity or enzyme abundance. Researchers can use that information to assess biomarker potential and to investigate how proteolytic pathways relate to kidney or urinary-tract conditions. The same evidence may guide exploration of strategies intended to address relevant enzymatic processes.