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• W1567981543 abstract "It has been proposed that GL15, a human cell line derived from glioblastoma multiforme, is a possible astroglial-like cell model, based on the presence of cytoplasmic glial fibrillary acidic protein. The aim of this work was to delineate the functional characteristics of GL15 cells using various experimental approaches, including the study of morphology, mechanism of induction of intracellular Ca2+ increase by different physiological agonists, and the presence and permeability of the gap-junction system during cell differentiation. Immunostaining experiments showed the presence and localization of specific glial markers, such as glial fibrillary acidic protein and S100B, and the lack of the neuronal marker S100A. Notably, all the Ca2+ pathways present in astrocytes were detected in GL15 cells. In particular, oscillations in intracellular Ca2+ levels were recorded either spontaneously, or in the presence of ATP or glutamate (but not KCl). Immunolabelling assays and confocal microscopy, substantiated by Western blot analyses, revealed the presence of connexin43, a subunit of astrocyte gap-junction channels. The protein is organised in characteristic spots on the plasma membrane at cell-cell contact regions, and its presence and distribution depends on the differentiative status of the cell. Finally, a microinjection/dye-transfer assay, employed to determine gap-junction functionality, clearly demonstrated that the cells were functionally coupled, albeit to varying degrees, in differentiated and undifferentiated phenotypes. In conclusion, results from this study support the use of the GL15 cell line as a suitable in vitro astrocyte model, which provides a valuable guide for studying glial physiological features at various differentiation phases." @default.
• W1567981543 created "2016-06-24" @default.
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• W1567981543 date "2001-01-01" @default.
• W1567981543 modified "2023-10-14" @default.
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• W1567981543 doi "https://doi.org/10.1186/1472-6793-1-4" @default.
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