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Blockage of voltage‐gated calcium signaling impairs migration of glial cells in vivo
Author(s) -
Lohr Christian,
Heil Jan E.,
Deitmer Joachim W.
Publication year - 2005
Publication title -
glia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.954
H-Index - 164
eISSN - 1098-1136
pISSN - 0894-1491
DOI - 10.1002/glia.20163
Subject(s) - biology , calcium , antennal lobe , neuroscience , calcium channel , calcium signaling , calcium imaging , neuroglia , t type calcium channel , microbiology and biotechnology , voltage dependent calcium channel , bapta , olfactory system , anatomy , signal transduction , central nervous system , medicine , extracellular
Migration of glial cells is an essential step in the development of the antennal lobe, the primary olfactory center of insects, to establish well‐defined borders between olfactory glomeruli required for odor discrimination. In the present study, we used two‐photon microscopy to visualize calcium signaling in developing antennal lobe glial cells of the sphinx moth Manduca sexta . We found a correlation between the upregulation of functional voltage‐gated calcium channels and the onset of glial cell migration. In addition, glial cells migrating into the center of the antennal lobe express larger voltage‐gated calcium transients than glial cells that remain at the periphery. Migration behavior and calcium signaling of glial cells in vivo were manipulated either by deafferentation, by injection of the calcium channel blockers diltiazem, verapamil, and flunarizine, or by injection of the calcium chelators BAPTA‐AM and Fluo‐4‐AM. In deafferented antennal lobes, glial cells failed to express functional voltage‐gated calcium channels and did not migrate. Calcium channel blockage or reducing glial calcium signals by calcium chelators prevented glial cell migration and resulted in antennal lobes lacking glial borders around glomeruli, indicating that voltage‐gated calcium signaling is required for the migration of antennal lobe glial cells and the development of mature olfactory glomeruli. © 2005 Wiley‐Liss, Inc.