Fibroblast growth factors in the developing central nervous system

Area of Science:

• Neuroscience
• Developmental Biology
• Molecular Biology

Background:

• Fibroblast growth factors (FGFs) play critical roles in central nervous system (CNS) development.
• The FGF family comprises at least 23 members, with 10 expressed in the developing CNS alongside four FGF receptors (FGFRs).

Purpose of the Study:

• This review focuses on the roles of specific FGFs (FGF-2, FGF-8, FGF-15, FGF-17) and their receptors in CNS formation.
• To elucidate the localized signaling mechanisms by which FGFs regulate brain development.

Main Methods:

• Review of expression studies on FGFs and FGFRs in chick and mouse models.
• Analysis of mutant animal data for FGF-2, FGF-8, FGF-17, FGFR-1, and FGFR-2b IIIb.

Main Results:

• FGF-2 and FGF-15 show broad CNS expression, while FGF-8 and FGF-17 are localized to specific embryonic brain regions.
• FGFR-1 is widely expressed; FGFR-2 and FGFR-3 have localized, dynamic expression patterns.
• Studies demonstrate localized FGF signaling regulates cortex, forebrain, midbrain, and cerebellum development.

Conclusions:

• A model of localized FGF-FGFR signaling is emerging for regional brain development.
• Significant gaps remain in understanding FGF/FGFR localization and signaling mechanisms.
• Further spatio-temporal mapping of FGFs and FGFR isoforms is essential for understanding molecular mechanisms.