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Calcium Dynamics in Astrocytes During Cell Injury.


ABSTRACT: The changes in intracellular calcium concentration ([Ca2+]) following laser-induced cell injury in nearby cells were studied in primary mouse astrocytes selectively expressing the Ca2+ sensitive GFAP-Cre Salsa6f fluorescent tandem protein, in an Ast1 astrocyte cell line, and in primary mouse astrocytes loaded with Fluo4. Astrocytes in these three systems exhibit distinct changes in [Ca2+] following induced death of nearby cells. Changes in [Ca2+] appear to result from release of Ca2+ from intracellular organelles, as opposed to influx from the external medium. Salsa6f expressing astrocytes displayed dynamic Ca2+ changes throughout the phagocytic response, including lamellae protrusion, cytosolic signaling during vesicle formation, vesicle maturation, and vesicle tract formation. Our results demonstrate local changes in [Ca2+] are involved in the process of phagocytosis in astrocytes responding to cell corpses and/or debris.

SUBMITTER: Wakida NM 

PROVIDER: S-EPMC7481337 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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The changes in intracellular calcium concentration ([Ca<sup>2+</sup>]) following laser-induced cell injury in nearby cells were studied in primary mouse astrocytes selectively expressing the Ca<sup>2+</sup> sensitive GFAP-Cre Salsa6f fluorescent tandem protein, in an Ast1 astrocyte cell line, and in primary mouse astrocytes loaded with Fluo4. Astrocytes in these three systems exhibit distinct changes in [Ca<sup>2+</sup>] following induced death of nearby cells. Changes in [Ca<sup>2+</sup>] appea  ...[more]

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