Caffeic acid phenethyl ester disrupts germ layer specification in Xenopus embryos

Area of Science:

• Developmental Biology
• Teratology
• Molecular Signaling

Background:

• Xenopus embryos are valuable models for teratogenesis assays.
• Understanding compound effects on early development and tissue homeostasis is crucial.

Purpose of the Study:

• To investigate the teratogenic effects of caffeic acid phenethyl ester (CAPE) in Xenopus embryos.
• To elucidate the molecular mechanisms underlying CAPE-induced developmental disruptions.

Main Methods:

• Screening of a chemical library using frog embryos.
• Analysis of germ layer formation, body axis patterning, and cell differentiation.
• Assessment of FGF/MAPK pathway activation, including ERK phosphorylation and FGFR1/FGFR4 involvement.

Main Results:

• CAPE upregulates the FGF/MAPK pathway, leading to disrupted germ layer formation.
• Exposure to CAPE interferes with anterior-posterior body axis and ectodermal derivative development.
• CAPE promotes paraxial mesoderm and neural differentiation while repressing epidermal and neural crest fates, causing anterior neural fate caudalization.

Conclusions:

• CAPE acts as an activator of the FGF/MAPK signaling pathway.
• CAPE induces severe teratogenic effects on germ layer specification in vertebrate early development.
• The findings highlight the critical role of FGF/MAPK signaling in embryonic patterning and cell fate determination.