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Updated: Apr 5, 2026
Biosensing Motor Neuron Membrane Potential in Live Zebrafish Embryos
Published on: June 26, 2017
A Caged Ret Kinase Inhibitor and its Effect on Motoneuron Development in Zebrafish Embryos
David Bliman1, Jesper R Nilsson2, Petronella Kettunen3
1Department of Chemistry and Molecular Biology, University of Gothenburg, SE-412 96 Gothenburg, Sweden.
Abstract:
Proto-oncogene tyrosine-protein kinase receptor RET is implicated in the development and maintenance of neurons of the central and peripheral nervous systems. Attaching activity-compromising photocleavable groups (caging) to inhibitors could allow for external spatiotemporally controlled inhibition using light, potentially providing novel information on how these kinase receptors are involved in cellular processes. Here, caged RET inhibitors were obtained from 3-substituted pyrazolopyrimidine-based compounds by attaching photolabile groups to the exocyclic amino function. The most promising compound displayed excellent inhibitory effect in cell-free, as well as live-cell assays upon decaging. Furthermore, inhibition could be efficiently activated with light in vivo in zebrafish embryos and was shown to effect motoneuron development.
Insights
Researchers developed caged RET inhibitors for light-controlled neuron development studies. These compounds offer spatiotemporal control over RET kinase activity, revealing insights into neuronal processes and motoneuron development in zebrafish.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- The proto-oncogene tyrosine-protein kinase receptor RET (Rearranged during transfection) plays a crucial role in the development and maintenance of central and peripheral nervous system neurons.
- Understanding the precise functions of RET signaling in neuronal processes requires precise control over its activity, which is challenging with conventional inhibitors.
- Photocleavable (caging) strategies offer a method for spatiotemporal control of molecular activity using light.
Purpose of the Study:
- To synthesize and characterize novel caged RET inhibitors for light-inducible, spatiotemporally controlled inhibition of RET kinase activity.
- To investigate the utility of these caged inhibitors in cell-free and live-cell assays.
- To evaluate the in vivo efficacy and biological effects of light-activated RET inhibition in a developing organism, specifically zebrafish motoneuron development.
Main Methods:
- Synthesis of caged RET inhibitors by attaching photolabile groups to 3-substituted pyrazolopyrimidine-based compounds.
- Evaluation of inhibitory activity in cell-free biochemical assays.
- Assessment of inhibitor efficacy and light-induced decaging in live-cell assays.
- In vivo studies in zebrafish embryos to assess light-activated inhibition and its effects on motoneuron development.
Main Results:
- Novel caged RET inhibitors were successfully synthesized from pyrazolopyrimidine scaffolds.
- The most effective caged inhibitor demonstrated potent RET kinase inhibition upon light-induced decaging in both cell-free and live-cell settings.
- In vivo application in zebrafish embryos showed that light-activated inhibition of RET signaling significantly impacted motoneuron development.
Conclusions:
- Caged RET inhibitors provide a powerful tool for spatiotemporal control of RET kinase activity.
- This approach enables novel investigations into the roles of RET signaling in cellular processes and neuronal development.
- The developed caged inhibitors are effective in vivo, offering a promising strategy for studying neurodevelopmental processes with light.
