Mammalian heparanase: what is the message?

Area of Science:

• Biochemistry and Molecular Biology
• Cell Biology
• Extracellular Matrix Biology

Background:

• Heparan sulphate proteoglycans (HSPGs) are crucial macromolecules on cell surfaces and in extracellular matrices.
• HSPGs bind and regulate numerous proteins, including growth factors, morphogens, and cytokines.
• The degradation of HSPGs can significantly affect cellular and tissue functions.

Purpose of the Study:

• To review current knowledge on HSPGs and their interactions.
• To summarize recent findings on the characterization of heparanase-1.
• To discuss the role of heparanase-1 in normal and pathological processes.

Main Methods:

• Literature review of heparan sulphate proteoglycans.
• Analysis of molecular properties, substrate specificity, and expression of heparanase-1.
• Review of studies implicating heparanase-1 in tumour metastasis, angiogenesis, and signaling.

Main Results:

• Heparanase-1 is the only identified functional heparanase.
• Heparanase-1's molecular properties, mechanism, and substrate specificity are detailed.
• Heparanase-1 is implicated in tumour metastasis, angiogenesis, and potentially direct signaling.

Conclusions:

• Heparan sulphate degradation profoundly affects cell and tissue function.
• Heparanase-1 plays a significant role in various biological processes.
• Heparanase-2, a homologue, lacks demonstrated heparan sulphate-degrading activity.