Adrenergic stimulation of single rat astrocytes results in distinct temporal changes in intracellular Ca(2+) and cAMP-dependent PKA responses

Cell Calcium
Anemari HorvatNina Vardjan

Abstract

During the arousal and startle response, locus coeruleus neurons, innervating practically all brain regions, release catecholamine noradrenaline, which reaches neural brain cells, including astrocytes. These glial cells respond to noradrenergic stimulation by simultaneous activation of the α- and β-adrenergic receptors (ARs) in the plasma membrane with increasing cytosolic levels of Ca(2+) and cAMP, respectively. AR-activation controls a myriad of processes in astrocytes including glucose metabolism, gliosignal vesicle homeostasis, gene transcription, cell morphology and antigen-presenting functions, all of which have distinct temporal characteristics. It is known from biochemical studies that Ca(2+) and cAMP signals in astrocytes can interact, however it is presently unclear whether the temporal properties of the two second messengers are time associated upon AR-activation. We used confocal microscopy to study AR agonist-induced intracellular changes in Ca(2+) and cAMP in single cultured cortical rat astrocytes by real-time monitoring of the Ca(2+) indicator Fluo4-AM and the fluorescence resonance energy transfer-based nanosensor A-kinase activity reporter 2 (AKAR2), which reports the activity of cAMP via its downstream effect...Continue Reading

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Citations

May 14, 2016·Behavioural Brain Research·Robert ZorecAlexej Verkhratsky
Sep 16, 2016·Neurochemical Research·Robert ZorecAlexei Verkhratsky
Feb 18, 2017·International Journal of Molecular Sciences·Nina VardjanRobert Zorec
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Feb 21, 2021·Glia·Tina SmoličNina Vardjan
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Feb 24, 2021·Cell Calcium·Anemari HorvatNina Vardjan
Mar 16, 2021·Frontiers in Cellular Neuroscience·Jérôme Wahis, Matthew G Holt

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