NG2 proteoglycan is expressed exclusively by mural cells during vascular morphogenesis

Area of Science:

• Vascular Biology
• Cell Biology
• Developmental Biology

Background:

• The NG2 proteoglycan is a cell surface protein with largely unknown functions.
• Identifying specific cell types involved in vascular development, such as pericytes, is challenging due to a lack of reliable markers.

Purpose of the Study:

• To investigate the expression pattern of NG2 proteoglycan in developing mouse vasculature.
• To evaluate the utility of NG2 as a marker for mural cells, particularly vascular pericytes.

Main Methods:

• Immunofluorescence mapping was employed to visualize NG2 proteoglycan expression in various mouse neovascular structures.
• Expression patterns were analyzed in relation to different vascular developmental mechanisms (vasculogenesis and angiogenesis).

Main Results:

• NG2 proteoglycan is consistently expressed by mural cells in all examined mouse neovascular structures.
• This expression is independent of whether vessels develop via vasculogenesis or angiogenesis.
• NG2 is found on cardiomyocytes, smooth muscle cells, and vascular pericytes, confirming its role as a mural cell marker.

Conclusions:

• NG2 proteoglycan serves as a reliable and universal marker for mural cells in mouse vasculature.
• Its utility is particularly significant for identifying vascular pericytes, aiding research into microvessel development and stabilization.
• Understanding NG2 expression provides insights into pericyte-endothelial cell interactions and factors influencing capillary formation.