Activation of mouse microglial cells affects P2 receptor signaling

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Item Type:	Article
Title:	Activation of mouse microglial cells affects P2 receptor signaling
Creators Name:	Moeller, T., Kann, O., Verkhratsky, A. and Kettenmann, H.
Abstract:	Microglial cells are the immunocompetent cells of the CNS, which are known to exist in several activation states. Here we investigated the impact of microglial activation on the P2 receptor-mediated intracellular calcium ([Ca 2+](i)) signaling by means of fluo-3 based Ca 2+-imaging. Cultured mouse microglial cells were treated with either astrocyte-conditioned medium to induce a ramified morphology or LPS to shift the cells toward the fully activated stage. The extracellular application of ATP (100 μM) induced a [Ca 2+](i) elevation in 85% of both untreated and ramified microglial cells, whereas only 50% of the LPS-activated cells responded to the stimulus. To characterise the pharmacological profile of microglial P2 receptors we investigated the effects of various P2 agonists on [Ca 2+](i) in cultured microglial cells. Untreated and ramified microglial cells demonstrated a very similar sensitivity to the different P2 agonists. In contrast, in LPS-activated microglia, a sharp decrease of responses to P2 agonist stimulation was seen. This indicates that microglial activation influences the capability of microglial cells to generate [Ca 2+](i) signals upon P2 receptor activation.
Keywords:	Calcium Signaling, Microglia, P2 Receptor, Receptor Modulation
Source:	Brain Research
ISSN:	0006-8993
Publisher:	Elsevier
Volume:	853
Number:	1
Page Range:	49-59
Date:	17 January 2000
Official Publication:	https://doi.org/10.1016/S0006-8993(99)02244-1
PubMed:	View item in PubMed

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