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Published on: December 31, 2013
Activation of TRPV4 channels reduces migration of immortalized neuroendocrine cells
Roberta Zaninetti1, Alessandra Fornarelli, Monica Ciarletta
1Dipartimento di Scienze Chimiche, Alimentari, Farmaceutiche e Farmacologiche, Università degli Studi del Piemonte Orientale A. Avogadro, Novara, Italy.
Abstract:
Calcium is a universal signal, and its capacity to encode intracellular messages via spatial, temporal and amplitude characteristics allows it to participate in most cellular events. In a specific context, calcium plays a pivotal role in migration, although its role has not been elucidated fully. By using immortalized gonadotropin-releasing hormone-secreting neurons (GN11), we have now investigated the role of TRPV4, a member of the vanilloid family of Ca(2+) channels, in neuronal migration. Our results show that TRPV4 channels are present and functional in GN11 cells and their localization is polarized and enriched in lamellipodial structures. TRPV4 activation leads to a retraction of the lamellipodia and to a decrease in migratory behaviour; moreover cells migrate slower and in a more random manner. We therefore provide evidence for a new regulation of gonadotropin-releasing hormone neurons and a new role for calcium at the leading edge of migratory cells.
Insights
Transient Receptor Potential Vanilloid 4 (TRPV4) channels regulate gonadotropin-releasing hormone neuron migration. TRPV4 activation impairs neuronal movement by affecting lamellipodia, revealing a new role for calcium signaling in cell migration.
Area of Science:
- Neuroscience
- Cell Biology
- Calcium Signaling
Background:
- Calcium ions (Ca2+) are crucial intracellular signals regulating diverse cellular functions.
- Neuronal migration is a fundamental process in development, yet the precise role of calcium remains incompletely understood.
- The vanilloid family of Ca2+ channels, including TRPV4, are implicated in cellular processes but their specific function in neuron migration requires further investigation.
Purpose of the Study:
- To investigate the role of Transient Receptor Potential Vanilloid 4 (TRPV4) channels in the migration of immortalized gonadotropin-releasing hormone-secreting neurons (GN11).
Main Methods:
- Utilized immortalized GN11 cells to study neuronal migration.
- Investigated the presence, function, and localization of TRPV4 channels in GN11 cells.
- Assessed the impact of TRPV4 activation on lamellipodia dynamics and migratory behavior.
Main Results:
- TRPV4 channels were found to be present and functional in GN11 cells.
- TRPV4 channels exhibited polarized localization, enriched in lamellipodial structures.
- Activation of TRPV4 channels resulted in lamellipodia retraction and reduced migratory behavior, characterized by slower and more random cell movement.
Conclusions:
- TRPV4 channels play a significant role in regulating the migration of gonadotropin-releasing hormone neurons.
- TRPV4-mediated calcium signaling at the leading edge of migratory cells influences their movement dynamics.
- This study identifies a novel regulatory mechanism for gonadotropin-releasing hormone neuron migration and highlights a new function for calcium in this process.
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