JunB regulates angiogenesis and neurovascular parallel alignment in mouse embryonic skin

Area of Science:

• Developmental Biology
• Vascular Biology
• Neuroscience

Background:

• Blood vessels and nerve fibers often grow in parallel, suggesting interactions influence vascular network development.
• The specific genes and molecular mechanisms driving these neurovascular interactions are not well understood.

Purpose of the Study:

• To identify genes activated in endothelial cells (ECs) upon interaction with neurons during vascular development.
• To elucidate the role of JunB in neurovascular interactions and embryonic vascular network formation.

Main Methods:

• Co-culture of human microvascular ECs with mouse dorsal root ganglion cells.
• Microarray analysis to identify gene expression changes in ECs.
• In vitro studies on JunB-overexpressing ECs.
• In vivo knockdown of JunB in mouse embryonic limb skin.

Main Results:

• JunB expression was significantly upregulated in ECs following neurovascular interaction.
• Forced JunB expression in ECs promoted tip-like cell formation and angiogenesis in vitro.
• JunB induced expression of vascular endothelial growth factor A (VEGFA) and integrin subunit ITGB3.
• In vivo knockdown of JunB impaired the parallel alignment of blood vessels and nerve fibers.

Conclusions:

• JunB is a critical regulator of embryonic vascular network formation.
• This study provides novel insights into the molecular mechanisms underlying neurovascular interactions during development.