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Cell surface association of matrix metalloproteinase-9 (gelatinase B)
Rafael Fridman1, Marta Toth, Irina Chvyrkova
1Department of Pathology, School of Medicine, Wayne State University, Detroit, MI 48201, USA. rfridman@med.wayne.edu
Abstract:
Matrix metalloproteinase (MMP)-9 (gelatinase B) belongs to the MMP family of zinc-dependent endopeptidases that has been associated with tumor cell invasion and metastasis and tumor-induced angiogenesis. As a secreted MMP, pro-MMP-9 is released into the extracellular environment by both tumor and stroma cells, where it fulfills its proteolytic functions degrading both extracellular matrix (ECM) and non-ECM proteins. A major dilemma in our understanding of MMP-9 function is how the released protease is targeted to the right location and how its activity is controlled at the pericellular space. It has been proposed that MMP-9 interact with cell surface components and that this type of interaction positively regulates enzymatic activation and activity. However, recent evidence shows that association of MMP-9 with the cell surface is mediated by a distinct array of surface proteins that serve to regulate multiple aspects of the enzyme function including localization, inhibition and internalization. How these distinct mechanisms regulate the overall MMP-9 activity at the pericellular space remains an important goal in our understanding of MMP-9 function at the cell surface. Furthermore, the study of surface-associated MMP-9 imposes new conceptual and methodological challenges with particular consideration to the unique structural and functional characteristics of this key enzyme.
Insights
Matrix metalloproteinase-9 (MMP-9) regulates tumor invasion and angiogenesis. Understanding how cell surface interactions control MMP-9 activity is crucial for cancer research.
Area of Science:
- Biochemistry
- Cell Biology
- Cancer Research
Background:
- Matrix metalloproteinase-9 (MMP-9), also known as gelatinase B, is a zinc-dependent endopeptidase.
- MMP-9 is implicated in tumor cell invasion, metastasis, and angiogenesis.
- The extracellular release and pericellular activity control of MMP-9 present significant research challenges.
Purpose of the Study:
- To investigate the mechanisms by which cell surface interactions regulate MMP-9 localization, activation, and activity.
- To elucidate the role of distinct surface proteins in mediating MMP-9 function at the pericellular space.
- To address conceptual and methodological challenges in studying cell surface-associated MMP-9.
Main Methods:
- The study focuses on the interactions between MMP-9 and cell surface components.
- Investigates the role of specific surface proteins in regulating MMP-9 function.
- Employs advanced techniques to study pericellular enzyme activity and localization.
Main Results:
- Recent evidence indicates that cell surface proteins mediate MMP-9 association, influencing its localization, inhibition, and internalization.
- These interactions play a critical role in modulating MMP-9 activity at the cell surface.
- The precise mechanisms governing these regulatory processes are still under investigation.
Conclusions:
- Cell surface interactions are key regulators of matrix metalloproteinase-9 (MMP-9) function.
- Understanding these interactions is vital for comprehending MMP-9's role in cancer progression.
- Further research is needed to fully elucidate the complexities of surface-associated MMP-9.