Related Experiment Video
Updated: Aug 16, 2026
Placing Growth Factor-Coated Beads on Early Stage Chicken Embryos
Published on: October 1, 2007
Experimental study of MAP kinase phosphatase-3 (Mkp3) expression in the chick neural tube in relation to Fgf8
Claudia Vieira1, Salvador Martinez
1Neuroscience Institute UMH-CSIC, University Miguel Hernandez, N-332, Km 87, E-03550 San Juan de Alicante, Spain.
Abstract:
Mitogen-activated protein kinase (MAPK) pathways are well known to be involved in signal transduction from extracellular to intracellular compartments in all eukaryotes. The activation of this cascade will have an effect on cell proliferation, differentiation, and apoptosis. In this study, we describe the cloning of the chick Mkp3 gene that is highly homologous to the mammalian gene and are both expressed in several embryo regions with demonstrated morphogenetic activity. In early developmental stages, Mkp3 and Fgf8 have similar expression patterns. Differences in the activation of Mkp3 transcription in the isthmus and the repression with FGF receptor inhibition suggest that Fgf8 protein controls Mkp3 transcription. Ectopically, expression of Fgf8 protein induces Mkp3 in a short period of time in the diencephalon, indicating a positive regulation of Mkp3 by Fgf8. Moreover, we show a distinct tissue competence to express Mkp3 rostrally and caudally to the zona limitans intrathalamica (ZLI).
Insights
This study identifies the chick Mkp3 gene, revealing its regulation by Fibroblast Growth Factor 8 (FGF8). Findings show FGF8 positively controls Mkp3 transcription during embryonic development, impacting cell processes.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Mitogen-activated protein kinase (MAPK) pathways are crucial for eukaryotic signal transduction, influencing cell proliferation, differentiation, and apoptosis.
- The Mkp3 gene, homologous to mammalian counterparts, is expressed in embryonic regions with morphogenetic activity.
Purpose of the Study:
- To clone the chick Mkp3 gene and investigate its relationship with Fibroblast Growth Factor 8 (FGF8) during embryonic development.
- To elucidate the regulatory mechanisms controlling Mkp3 gene expression.
Main Methods:
- Cloning of the chick Mkp3 gene.
- Analysis of Mkp3 and Fgf8 expression patterns in embryonic tissues.
- Investigating the effect of FGF receptor inhibition on Mkp3 transcription.
- Ectopic expression of Fgf8 protein in the diencephalon.
Main Results:
- Chick Mkp3 gene cloned, showing high homology to mammalian genes.
- Mkp3 and Fgf8 exhibit similar expression patterns in early embryonic stages.
- FGF8 positively regulates Mkp3 transcription, as evidenced by repression with FGF receptor inhibition and induction by ectopic Fgf8.
- Distinct tissue competence for Mkp3 expression observed relative to the zona limitans intrathalamica (ZLI).
Conclusions:
- FGF8 is a key regulator of Mkp3 transcription during chick embryonic development.
- Mkp3 expression is spatially regulated, with specific tissue competencies.
- This study provides insights into the molecular mechanisms underlying embryonic morphogenesis involving MAPK pathways.
