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70 K type IV collagenase (gelatinase)
K Tryggvason1, P Huhtala, M Höyhtya
1Biocenter, University of Oulu, Finland.
Matrix (Stuttgart, Germany). Supplement
|January 1, 1992
Summary
Type IV collagenase, an enzyme that degrades basement membranes, is crucial for tumor cell invasion. Assays measuring its activity may aid in monitoring malignant growth.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Type IV collagenase (gelatinase) is a neutral metalloproteinase involved in extracellular matrix degradation.
- It exists as a latent proenzyme, activated extracellularly to a 62,000 dalton enzyme.
- Structurally, it is related to interstitial collagenase and stromelysin but possesses unique features.
Purpose of the Study:
- To characterize type IV collagenase, its enzymatic properties, and gene structure.
- To investigate the role of type IV collagenase in basement membrane turnover and tumor cell invasion.
- To explore the potential of type IV collagenase assays in cancer monitoring.
Main Methods:
- Enzymatic assays to measure type IV collagenase activity.
- Analysis of gene structure and promoter region.
- mRNA level quantification and immunostaining in tumor cells and tissues.
Main Results:
- Type IV collagenase specifically cleaves type IV collagen and gelatin.
- Its structure includes internal repeats similar to fibronectin type II domains.
- Gene regulation appears distinct from other metalloproteinases.
- Elevated activity correlates with tumor cell invasiveness and basement membrane penetration.
- Enzyme activity and mRNA levels show potential for malignant growth follow-up.
Conclusions:
- Type IV collagenase is essential for basement membrane remodeling and tumor metastasis.
- Its unique structural and regulatory features distinguish it from other metalloproteinases.
- Assays for type IV collagenase may serve as valuable biomarkers for cancer progression and management.