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Alterations of calcium homoeostasis in cultured rat astrocytes evoked by bioactive sphingolipidsStenovec, Matjaž ...Aim: In the brain, alterations in sphingolipid metabolism contribute to several neurological disorders; however, their effect on astrocytes is largely unknown. Here, we identified bioactive ... sphingolipids that affect intracellular free calcium concentration ([Ca2+ ]i ), mobility of peptidergic secretory vesicles, signalling pathways involved in alterations of calcium homoeostasis and explored the relationship between the stimulus-evoked increase in [Ca2+ ]i and attenuation of vesicle mobility. Methods: Confocal time-lapse images were acquired to explore [Ca2+ ]i signals, the mobility of fluorescently tagged peptidergic vesicles and the structural integrity of the microtubules and actin filaments before and after the addition of exogenous sphingolipids to astrocytes. Results: Fingolimod (FTY720), a recently introduced therapeutic for multiple sclerosis, and sphingosine, a releasable constituent of membrane sphingolipids, evoked long-lasting increases in [Ca2+ ]i in the presence and absence of extracellular Ca2+ ; the evoked responses were diminished in the absence of extracellular Ca2+ . Activation of phospholipase C and inositol-1,4,5-triphosphate receptors was necessary and sufficient to evoke increases in [Ca2+ ]i as revealed by the pharmacologic inhibitors; Ca2+ flux from the extracellular space intensified these responses several fold. The lipid-evoked increases in [Ca2+ ]i coincided with the attenuated vesicle mobility. High and positive correlation between increase in [Ca2+ ]i and decrease in peptidergic vesicle mobility was confirmed independently in astrocytes exposed to evoked, transient Ca2+ signalling triggered by purinergic and glutamatergic stimulation. Conclusion: Exogenously added cell-permeable sphingosine-like lipids exert complex, Ca2+ -dependent effects on astrocytes and likely alter their homeostatic function in vivo.Source: Acta physiologica. - ISSN 1748-1708 (Vol. 212, iss. 1, Sep. 2014, str. 49-61)Type of material - article, component partPublish date - 2014Language - englishCOBISS.SI-ID - 31434713
Author
Stenovec, Matjaž |
Trkov, Saša |
Kreft, Marko |
Zorec, Robert, 1958-
Topics
astrocytes |
calcium |
phospholipase |
astrociti |
kalcij |
fosfolipaze
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Stenovec, Matjaž | 15467 |
Trkov, Saša | 31572 |
Kreft, Marko | 15666 |
Zorec, Robert, 1958- | 03702 |
Source: Personal bibliographies
and: SICRIS
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