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Proteolytic activity in mouse urine: relationship to the kidney metallo-endopeptidase, meprin
A V Flannery1, G N Dalzell, R J Beynon
1Department of Biochemistry, University of Liverpool, U.K.
Abstract:
Meprin, a brush border kidney metallo-endopeptidase is present as the major endopeptidase in mouse urine. The enzyme is freely soluble and can be detected enzymically or immunologically. Mice can be partitioned into two phenotypes that differ by 10-20-fold in the amount of meprin in kidney membranes; this phenotypic variation is reflected in urinary activities. We propose a role for meprin in the degradation of other urinary proteins.
Insights
Meprin, a kidney enzyme, is abundant in mouse urine and varies between individuals. This study suggests meprin plays a role in breaking down other urinary proteins.
Area of Science:
- Biochemistry
- Nephrology
- Enzymology
Background:
- Meprin is a major metallo-endopeptidase found in the brush border of kidney cells.
- It is freely soluble and detectable in mouse urine through enzymatic or immunological methods.
Purpose of the Study:
- To investigate the role of meprin in urinary protein degradation.
- To characterize meprin's presence and activity in mouse urine.
Main Methods:
- Enzymatic and immunological detection of meprin.
- Phenotyping mice based on meprin levels in kidney membranes and urine.
Main Results:
- Mice exhibit distinct phenotypes with 10-20 fold differences in kidney meprin levels.
- Urinary meprin activity directly correlates with kidney meprin expression.
- Meprin is the predominant endopeptidase in mouse urine.
Conclusions:
- Meprin's presence and activity in urine suggest a significant role in protein metabolism.
- Phenotypic variation in meprin influences urinary protein processing.