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Updated: Jun 29, 2026
An Enhanced Green Fluorescence Protein-based Assay for Studying Neurite Outgrowth in Primary Neurons
Published on: October 19, 2019
Expression of a chimeric CSF1R-LTK mediates ligand-dependent neurite outgrowth
Shigeru Yamada1, Takashi Nomura, Kota Takano
1Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology, Kohtoh-ku, Tokyo, Japan.
Abstract:
In an earlier screening, we identified several genes for kinases that might control the extension of neurites. One of these genes encoded a leukocyte tyrosine kinase (LTK), which is a receptor tyrosine kinase whose ligands remain to be identified. To examine the possible role of this LTK in neurite outgrowth, we constructed a chimeric receptor, in which the extracellular domain of the receptor for colony-stimulating factor-1 was fused to the cytoplasmic domain of LTK, which allowed the selective activation of LTK by colony-stimulating factor-1. Our studies using this chimeric receptor suggest that activation of the tyrosine kinase activity of LTK is sufficient to promote neurite outgrowth through pathways that include reactions catalyzed by phosphatidylinositol 3-kinase and MAPK.
Insights
Leukocyte tyrosine kinase (LTK) activation promotes neurite outgrowth. This process involves phosphatidylinositol 3-kinase and MAPK signaling pathways, suggesting LTK
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Signaling
Background:
- Neurite outgrowth is crucial for neural development and function.
- Leukocyte tyrosine kinase (LTK) was identified as a potential regulator of neurite extension.
- The ligands and precise role of LTK in this process were previously unknown.
Purpose of the Study:
- To investigate the role of leukocyte tyrosine kinase (LTK) in neurite outgrowth.
- To determine if LTK activation is sufficient to induce neurite extension.
Main Methods:
- Construction of a chimeric receptor fusing the extracellular domain of CSF-1R with the intracellular domain of LTK.
- Selective activation of LTK using colony-stimulating factor-1 (CSF-1).
- Analysis of downstream signaling pathways, including phosphatidylinositol 3-kinase (PI3K) and mitogen-activated protein kinase (MAPK).
Main Results:
- Activation of the chimeric LTK receptor by CSF-1 successfully promoted neurite outgrowth.
- The observed neurite outgrowth was dependent on the tyrosine kinase activity of LTK.
- Downstream signaling involved phosphatidylinositol 3-kinase (PI3K) and MAPK pathways.
Conclusions:
- Activation of leukocyte tyrosine kinase (LTK) is sufficient to promote neurite outgrowth.
- LTK signaling in neurite extension involves PI3K and MAPK pathways.
- These findings elucidate a novel role for LTK in neuronal development.
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