Novel Roles of MT1-MMP and MMP-2: Beyond the Extracellular Milieu

Area of Science:

• Biochemistry and Molecular Biology
• Cell Biology
• Cancer Research

Background:

• Matrix metalloproteinases (MMPs) are enzymes primarily known for extracellular matrix degradation and cell migration.
• Recent research explores the less-understood intracellular functions and diverse subcellular localizations of MMPs.
• This review focuses on membrane-type-1 matrix metalloproteinase (MT1-MMP) and matrix metalloproteinase-2 (MMP-2).

Purpose of the Study:

• To review the novel subcellular localizations and intracellular roles of MT1-MMP and MMP-2.
• To highlight the nuclear functions of MT1-MMP and MMP-2.
• To explore the therapeutic potential of targeting nuclear MMPs in cancer.

Main Methods:

• Literature review of studies investigating MMP subcellular localization.
• Analysis of research on the intracellular functions of MT1-MMP and MMP-2.
• Synthesis of findings related to nuclear MMP roles in cancer epigenetics, migration, and invasion.

Main Results:

• MT1-MMP localizes to the cell surface, cytoplasm, caveolae, Golgi, cytoskeleton, centrosome, and nucleus, with roles in migration, metabolism, invadopodia, spindle formation, and gene expression.
• MMP-2 localizes to caveolae, mitochondria, cytoskeleton, nucleus, and nucleolus, with functions in calcium regulation, contractile dysfunction, gene expression, and rRNA transcription.
• Both MT1-MMP and MMP-2 exhibit significant roles within the nucleus.

Conclusions:

• MT1-MMP and MMP-2 possess diverse intracellular functions beyond their known extracellular roles.
• Nuclear localization of MT1-MMP and MMP-2 is critical for processes like gene expression and potentially cancer epigenetics.
• Targeting nuclear MT1-MMP and MMP-2 presents a promising strategy for developing novel cancer therapies to inhibit proliferation and metastasis.