37/67-laminin receptor facilitates neural crest cell migration during enteric nervous system development

Area of Science:

• Developmental biology
• Neuroscience
• Extracellular matrix research

Background:

• Enteric nervous system (ENS) development relies on neural crest cell (NCC) migration, influenced by the extracellular matrix (ECM).
• Hirschsprung disease (HSCR) is characterized by incomplete NCC migration and ENS formation, with prior research suggesting abnormal ECM involvement.

Purpose of the Study:

• To investigate the role of the 37/67 kDa laminin receptor (LAMR) in NCC migration during ENS development.
• To explore LAMR as a potential therapeutic target for HSCR by examining its function and response to laminin-β1 analogs.

Main Methods:

• Comparative microarray analysis of wild-type and EdnrB^NCC-/- mouse hindgut to identify differentially expressed ECM components.
• In vitro gut slice and ex vivo organ cultures to assess the functional role of LAMR in NCC migration.
• LAMR silencing and treatment with a laminin-β1 analog (YIGSR) in murine HSCR models.

Main Results:

• Laminin-β1 was upregulated, and LAMR expression was decreased in murine HSCR models and human HSCR samples.
• LAMR expression on enteric NCCs is crucial for migration, as LAMR silencing abrogated migration.
• Application of the YIGSR analog to EdnrB^NCC-/- colon explants significantly promoted hindgut colonization.

Conclusions:

• LAMR plays a critical role in regulating NCC migration during ENS development.
• Downregulation of LAMR is implicated in HSCR pathogenesis.
• Targeting LAMR with analogs like YIGSR shows promise for regenerative medicine approaches to HSCR.