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Evaluation of seprase activity.

¹Department of Pathology, Arkansas Cancer Research Center, University of Arkansas for Medical Sciences, Little Rock 72205-7199, USA. kellythomasj@exchange.uams.edu

Clinical & Experimental Metastasis

|July 2, 1999

Summary

This summary is machine-generated.

This study introduces a new quantitative assay for seprase activity, a protease overexpressed in invasive tumors. The 3H-gelatin degradation method offers a more precise alternative to zymography for cancer research.

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Area of Science:

Biochemistry
Molecular Biology
Cancer Research

Background:

Seprase is a membrane-bound serine protease.
Overexpressed in invasive tumor cells.
Current activity assays (zymography) lack quantitative precision.

Purpose of the Study:

Establish a simple, quantitative method for seprase activity assessment.
Validate the new assay against existing methods and conditions.
Enable seprase activity measurement in tumor tissues and identification of inhibitors.

Main Methods:

Utilized a 3H-gelatin substrate degradation assay.
Incorporated EDTA to inhibit matrix metalloproteinases, isolating seprase activity.
Validated using partially purified seprase from chicken embryos and human breast cancer tissue.
Compared results with zymography under various temperature conditions and after immunopreciptiation.

Main Results:

Demonstrated assay linearity with seprase concentration and dilution.
Confirmed seprase activity optima at 22-37°C and abolition at 80-100°C.
Showed differential heat sensitivity compared to zymography at 60°C.
Human breast cancer seprase exhibited five-fold higher specific activity than chicken embryo seprase.

Conclusions:

The developed 3H-gelatin assay provides a quantitative measure of seprase activity.
This method is suitable for analyzing seprase in tumor extracts.
The assay facilitates the discovery of novel seprase inhibitors for cancer therapy.