Related Experiment Video
Updated: Apr 19, 2026
Assaying Circuit Specific Regulation of Adult Hippocampal Neural Precursor Cells
Published on: July 24, 2019
TRPM7 Regulates Axonal Outgrowth and Maturation of Primary Hippocampal Neurons
Ekaterina Turlova1,2, Christine Y J Bae1,2, Marielle Deurloo2
1Department of Surgery, Faculty of Medicine, University of Toronto, 1132 Medical Sciences Building, 1 King's College Circle, Toronto, ON, M5S 1A8, Canada.
Abstract:
Transient receptor potential melastatin 7 (TRPM7) is a calcium-permeable divalent cation channel and mediates neuronal cell death under ischemic stresses. In this study, we investigated the contribution of TRPM7 to neuronal development in mouse primary hippocampal neurons. We demonstrated that TRPM7 channels are highly expressed in the tips of the growth cone. Either knockdown of TRPM7 with target-specific shRNA or blocking channel conductance by a specific blocker waixenicin A enhanced axonal outgrowth in culture. Blocking TRPM7 activity by waixenicin A reduced calcium influx and accelerated the polarization of the hippocampal neurons as characterized by the development of distinct axons and dendrites. Furthermore, TRPM7 coprecipitated and colocalized with F-actin and α-actinin-1 at the growth cone. We conclude that calcium influx through TRPM7 inhibits axonal outgrowth and maturation by regulating the F-actin and α-actinin-1 protein complex. Inhibition of TRPM7 channel promotes axonal outgrowth, suggesting its therapeutic potential in neurodegenerative disorders.
Insights
Transient receptor potential melastatin 7 (TRPM7) channels regulate neuronal development. Inhibiting TRPM7 enhances axonal outgrowth, suggesting therapeutic potential for neurodegenerative disorders.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Transient receptor potential melastatin 7 (TRPM7) is a calcium-permeable channel implicated in neuronal cell death during ischemia.
- Its role in normal neuronal development remains largely unexplored.
Purpose of the Study:
- To investigate the function of TRPM7 in the development of mouse primary hippocampal neurons.
- To determine the impact of TRPM7 activity on axonal outgrowth and neuronal polarization.
Main Methods:
- TRPM7 expression analysis in hippocampal neurons.
- TRPM7 knockdown using shRNA and pharmacological inhibition with waixenicin A.
- Assessment of axonal outgrowth and neuronal polarization.
- Co-immunoprecipitation and colocalization studies with F-actin and α-actinin-1.
Main Results:
- TRPM7 channels are highly expressed at the growth cone tips.
- Inhibition or knockdown of TRPM7 significantly enhanced axonal outgrowth.
- Blocking TRPM7 reduced calcium influx and accelerated neuronal polarization.
- TRPM7 was found to interact with F-actin and α-actinin-1 at the growth cone.
Conclusions:
- Calcium influx through TRPM7 inhibits axonal outgrowth and maturation by regulating the F-actin/α-actinin-1 complex.
- Inhibiting TRPM7 promotes axonal growth, indicating potential therapeutic applications for neurodegenerative diseases.
