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Wnt3a Ectopic Expression Interferes Axonal Projection and Motor Neuron Positioning During the Chicken Spinal Cord
Qiuling Li1, Ciqing Yang1,2, Bichao Zhang1
1Stem Cell Research Center, Xinxiang Key Laboratory of Neurodevelopment, College of Life Science and Technology, Xinxiang Medical University, Xinxiang, 453003, China.
Journal of Molecular Neuroscience : MN
|March 26, 2018
Summary
Wnt3a overexpression disrupts chicken spinal cord development by affecting neuronal morphology, leading to abnormal axonal projection and motor neuron positioning. This impacts nerve fiber formation and motor column development.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Spinal cord patterning involves dorsal signals like Wnts and ventral signals like sonic hedgehog (Shh).
- Wnt3a, a Wnt family member, regulates crucial cellular functions including proliferation and differentiation.
Purpose of the Study:
- To investigate the regulatory mechanism of Wnt3a in chicken spinal cord patterning.
- To understand how Wnt3a influences neuronal morphology and axonal development.
Main Methods:
- Ectopic expression of Wnt3a in developing chicken embryos via in ovo electroporation.
- Immunofluorescent staining to analyze axonal projection and neuronal migration.
- Assessment of neurite outgrowth in cultured SH-SY5Y cells.
Main Results:
- Ectopic Wnt3a expression disrupted commissural axonal projection and nerve fiber formation.
- Overexpression of Wnt3a inhibited lateral migration of ventricular zone neurons, including motor neurons, causing motor column malformation.
- Wnt3a inhibited axonal protrusion and neurite outgrowth in cultured cells.
Conclusions:
- Wnt3a plays a critical role in regulating neuronal morphology during spinal cord development.
- Disruption of neuronal morphology by Wnt3a leads to aberrant axonal projection and motor neuron positioning.
- Wnt3a is a key regulator of spinal cord patterning through its effects on neuronal development.
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