Aggrecan and versican: two brothers close or apart

Area of Science:

• Biochemistry
• Molecular Biology
• Extracellular Matrix Biology

Background:

• Aggrecan (Acan) and versican (Vcan) are large chondroitin sulfate proteoglycans.
• They share homologous N-terminal G1 and C-terminal G3 domains.
• These domains are crucial for binding hyaluronan and growth factors like TGFβ and BMPs.

Purpose of the Study:

• To review the structural domains, expression patterns, and functions of Acan and Vcan.
• To highlight their reciprocal localizations in various tissues.
• To discuss the regulation of their gene expression.

Main Methods:

• Literature review and synthesis of existing research on Acan and Vcan.
• Analysis of structural domain functions.
• Comparison of expression patterns and biological roles.

Main Results:

• Acan and Vcan share key structural domains (G1, G3) involved in matrix assembly and signaling molecule binding.
• Their tissue-specific and often reciprocal expression patterns suggest distinct physiological roles.
• The G3 domain's EGF-like motifs may possess ligand-like activity.

Conclusions:

• Acan and Vcan are critical extracellular matrix components with conserved domains but divergent functions.
• Their reciprocal expression and distinct roles underscore their importance in tissue homeostasis.
• Further research into their regulatory mechanisms can reveal therapeutic targets.