Glycocalyx and its involvement in clinical pathophysiologies.

Area of Science:

• Biomedical Engineering
• Cell Biology
• Critical Care Medicine

Background:

• Vascular hyperpermeability is a significant challenge in intensive care unit (ICU) patients.
• The endothelial glycocalyx (GCX), a key component of the endothelial surface layer (ESL), plays a critical role in regulating vascular permeability.
• The GCX is increasingly recognized for its functions beyond a simple barrier, including signal transduction.

Purpose of the Study:

• To explore the role of the endothelial glycocalyx (GCX) in vascular permeability and its implications for critical care.
• To review recent advancements in visualizing and analyzing GCX function in vivo.
• To discuss the potential of GCX biomarkers and therapeutic interventions for managing vascular leakage.

Main Methods:

• Advanced microscopy techniques, including fluorescent-labeled lectins and solutes, for in vivo visualization of the GCX and vascular leakage.
• Analysis of GCX degradation biomarkers, such as syndecan-1 and hyaluronan (HA).
• Review of current research on the biological regulation of vascular permeability by the GCX.

Main Results:

• Direct visualization of the GCX in vivo is now possible using advanced microscopy.
• GCX degradation biomarkers (syndecan-1, HA) show promise as indicators of vascular damage.
• GCX degradation is closely linked to disease progression, highlighting its clinical relevance.

Conclusions:

• The endothelial glycocalyx (GCX) is a critical regulator of vascular permeability, challenging the traditional Starling's law.
• GCX degradation serves as a reliable marker for vascular damage in critical conditions.
• Targeting GCX degradation and repair presents a promising avenue for novel medical interventions in critical care.