Regulated Hyaluronan Synthesis by Vascular Cells.

Area of Science:

• Biochemistry
• Cell Biology
• Pathology

Background:

• The cellular microenvironment is crucial in pathologies like atherosclerosis.
• Hyaluronan (HA) accumulation correlates with atherosclerosis progression, promoting vessel thickening and cell migration.
• HA synthesis is modulated by HA synthase 2 (HAS2) modifications and substrate availability.

Purpose of the Study:

• To review mechanisms regulating HA synthesis.
• To explore the role of these mechanisms in atherosclerosis development and progression.

Main Methods:

• Investigated the role of the hexosamine biosynthetic pathway (HBP) in HA synthesis.
• Examined the impact of O-GlcNAcylation on HA production in human aortic vascular smooth muscle cells (VSMCs).
• Assessed the effect of oxidized low-density lipoproteins (oxLDLs) on HA synthesis.

Main Results:

• Increased O-GlcNAcylation augmented HA secretion and HAS2 mRNA accumulation in VSMCs.
• Inhibition of O-GlcNAcylation reduced HA production.
• Oxidized LDLs strongly induce HA synthesis in vascular cells.

Conclusions:

• O-GlcNAcylation flux through the HBP is a critical regulator of HA biosynthesis in VSMCs.
• HA synthesis modulation, particularly via O-GlcNAcylation, plays a significant role in atherosclerosis.
• Understanding these pathways offers insights into atherosclerosis pathogenesis.