Growth factors in the extracellular matrix

Area of Science:

• Cell Biology
• Biochemistry
• Developmental Biology

Background:

• Research has focused on intracellular growth factor signaling pathways.
• Extracellular regulation of growth factors by matrix proteins and enzymes is less understood.
• Examples of extracellular regulation include blood clotting and complement pathways.

Purpose of the Study:

• To highlight the role of the extracellular environment in regulating growth factor signaling.
• To emphasize the importance of extracellular matrix in controlling cell proliferation, differentiation, and tissue remodeling.
• To propose that extracellular information processing is key to multicellular organism development.

Main Methods:

• Review of recent research on growth factor gene expression and signaling.
• Analysis of extracellular matrix protein and enzyme interactions with growth factors.
• Examination of mechanisms for localized changes in growth factor activity.

Main Results:

• Growth factors like IGFs, FGFs, TGF-beta, and HGF associate with extracellular matrix and heparan sulfate.
• Extracellular matrix proteins and enzymes modulate growth factor activity through release from storage and activation of latent forms.
• Extracellular regulation allows for complex information processing without new protein synthesis.

Conclusions:

• The extracellular environment, particularly the extracellular matrix, plays a major role in controlling growth factor signaling.
• Extracellular matrix-mediated growth factor regulation is essential for cell proliferation, differentiation, and tissue remodeling.
• Information processing in the extracellular space is critical for the development of complex multicellular organisms.