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Dysmorphogenic effects of a specific protein kinase C inhibitor during neurulation
K W Ward1, E H Rogers, E S Hunter
1Curriculum in Toxicology, University of North Carolina at Chapel Hill, USA.
Abstract:
Protein kinase C (PKC) plays a key role in signal transduction and is an important mediator of events throughout development. However, no information exists regarding the effect of a specific PKC inhibitor on mammalian embryogenesis during neurulation. This investigation was undertaken to examine the effects of a specific inhibitor of PKC, as well as inhibitors of other important kinases, on cultured mouse embryos. CD-1 mouse embryos (3 to 6 somite stage) were exposed to bisindolylmaleimide I (a specific PKC inhibitor) as well as specific inhibitors of PKA, PKG, and MAP kinase kinase for 24 h. The PKC inhibitor was a potent embryotoxicant and elicited malformations at concentrations as low as 0.01 microM. Inhibitors of other kinases also produced malformations but at much higher concentrations than those required to produce similar defects with the PKC inhibitor. These data suggest that PKC plays an important role in mammalian neurulation. Further research is required to clarify the mechanism by which PKC inhibition at this developmental stage produces malformations and the potential effects of environmental toxicants with PKC inhibitory properties on this signal transduction pathway.
Insights
A specific Protein Kinase C (PKC) inhibitor caused significant malformations in developing mouse embryos during neurulation, highlighting PKC's crucial role in mammalian development.
Area of Science:
- Developmental Biology
- Molecular Biology
- Toxicology
Background:
- Protein Kinase C (PKC) is vital for signal transduction and developmental processes.
- The specific impact of PKC inhibitors on mammalian embryogenesis during neurulation remains uncharacterized.
Purpose of the Study:
- To investigate the effects of a specific PKC inhibitor on mouse embryo development during neurulation.
- To compare the embryotoxic effects of a PKC inhibitor with those of other kinase inhibitors.
Main Methods:
- Cultured CD-1 mouse embryos (3-6 somite stage) were treated with bisindolylmaleimide I (PKC inhibitor) and inhibitors of PKA, PKG, and MAP kinase kinase for 24 hours.
Main Results:
- The PKC inhibitor demonstrated potent embryotoxicity, inducing malformations at concentrations as low as 0.01 microM.
- Inhibitors of other kinases also caused malformations, but required significantly higher concentrations compared to the PKC inhibitor.
Conclusions:
- PKC plays a critical role in mammalian neurulation.
- Further research is needed to elucidate the mechanism of PKC inhibition-induced malformations and the implications of environmental toxicants affecting this pathway.