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Exp Cell Res. 2018 Jul 15;368(2):202-214. doi: 10.1016/j.yexcr.2018.04.031. Epub 2018 May 2.

Calcium influx differentially regulates migration velocity and directedness in response to electric field application.

Author information

1
Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Canada; Department of Surgery, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.
2
Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Canada; Institute of Medical Sciences, University of Toronto, Toronto, Ontario, Canada.
3
Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Canada.
4
Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada.
5
Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Canada; Donnelly Centre for Cellular and Biomolecular Research, University of Toronto, Toronto, Canada; Institute of Medical Sciences, University of Toronto, Toronto, Ontario, Canada; Department of Surgery, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada. Electronic address: cindi.morshead@utoronto.ca.

Abstract

Neural precursor cells (NPCs) respond to externally applied direct current electrical fields (DCEFs) by undergoing rapid and directed migration toward the cathode in a process known as galvanotaxis. It is unknown if the underlying mechanisms of galvanotactic migration is common to non-electrosensitive cells and if so, how NPCs and other galvanotactic cells sense and transduce electrical fields into cellular motility. In this study, we show that distinct aspects of NPC galvanotactic migration: motility (quantified through |velocity|) and directedness, are differentially regulated by calcium. We use low-Ca2+ culture conditions; an intracellular Ca2+ chelator; and voltage gated calcium channel (VGCC) inhibitors to specific channels expressed on NPCs, to demonstrate the role of Ca2+ influx in DCEF-induced NPC migration. Consistent with existing literature, we show Ca2+ is involved in F-actin polymerization that lengthens NPC membrane protrusions necessary for cellular motility. However, inhibiting Ca2+ results in reduced velocity but has no effect on DCEF-induced directedness. This dissociation between velocity and directedness reveal that these migration parameters can be independently regulated, thus suggesting a parallel process of sensing DCEFs by NPCs.

KEYWORDS:

Calcium signaling; Cell migration; F-actin; Galvanotaxis; Neural precursor cells

PMID:
29729231
DOI:
10.1016/j.yexcr.2018.04.031
[Indexed for MEDLINE]

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