mafba and mafbb differentially regulate lymphatic endothelial cell migration in topographically distinct manners

Area of Science:

• Developmental biology
• Molecular biology
• Zebrafish models

Background:

• Lymphangiogenesis, the formation of lymphatic vessels, involves intricate cell migration processes.
• The transcription factor MAFB is known to regulate lymphatic development across species.
• Mechanisms controlling lymphatic endothelial cell (LEC) migration in diverse anatomical locations are not fully understood.

Purpose of the Study:

• To investigate the distinct roles of Mafba and Mafbb paralogs in LEC migration.
• To elucidate the molecular mechanisms governing facial and trunk lymphangiogenesis.
• To identify key regulatory networks controlling lymphatic vessel development.

Main Methods:

• Zebrafish model system for studying lymphangiogenesis.
• Genetic analysis of mafba and mafbb paralogs.
• Molecular pathway analysis including Vegfc, Vegfd, and SoxF.

Main Results:

• Mafba and Mafbb exhibit topographically distinct requirements for LEC migration.
• Both mafba and mafbb are essential for facial lymphatic development.
• Mafbb is dispensable for trunk lymphatic development, while mafba is required.
• A regulatory network involving Vegfc-Vegfd-SoxF-Mafba-Mafbb was identified in facial lymphangiogenesis.
• Mafba and Mafbb modulate LEC migration directionality and vessel morphogenesis.

Conclusions:

• Mafba and Mafbb play critical, context-dependent roles in lymphatic endothelial cell migration.
• Differential regulation of mafba and mafbb paralogs is key to specific lymphatic network formation.
• The identified molecular network provides insights into the control of lymphangiogenesis and lymphatic function.