Remodelling of the basement membrane: morphogenesis and maturation

Area of Science:

• Developmental Biology
• Cell Biology
• Tissue Engineering

Background:

• Branching morphogenesis is crucial for organ development.
• Basement membranes regulate cell-epithelium and epithelium-mesenchyme interactions.
• Understanding these interactions is key to tissue development and regeneration.

Purpose of the Study:

• To analyze reciprocal interactions between mouse embryo submandibular epithelium and mesenchyme.
• To elucidate the role of basement membrane remodeling in branching morphogenesis.
• To investigate the contribution of collagen-proteoglycan interactions to cell morphological stability.

Main Methods:

• Analysis of submandibular gland development in mouse embryos.
• Biochemical analysis of basement membrane composition and metabolism.
• Investigating cell surface proteoglycans and their interaction with collagen.
• Experimental manipulation of collagen-proteoglycan interactions.

Main Results:

• Mesenchyme remodels the basement membrane by depositing type I collagen and degrading hyaluronate and chondroitin sulphate.
• Epithelial cells possess heparan sulfate-rich proteoglycans that bind interstitial collagen.
• Interference with collagen-proteoglycan binding reduces epithelial cell morphological stability.
• Basement membrane remodeling is linked to epithelial cell proliferation and branching morphogenesis.

Conclusions:

• Basement membrane remodeling is a key mechanism in epithelial branching morphogenesis.
• The collagen-proteoglycan interaction is vital for maintaining cell morphological stability.
• Basement membrane remodeling contributes to the transition from embryonic dynamic states to adult stability.
• This study highlights basement membrane remodeling as a general mechanism regulating cell behavior during development.