NDLI: Purinergic P2Y1 Receptors Control Rapid Expression of Plasma Membrane Processes in Hippocampal Astrocytes

Content Provider	Springer Nature Link
Author	Chisari, Mariangela Scuderi, Angela Ciranna, Lucia Volsi, Guido Li Licata, Flora Sorti, Maria Angela
Copyright Year	2016
Abstract	Astrocytes regulate neuronal activity and blood brain barrier through tiny plasma membrane branches or astrocytic processes (APs) making contact with synapses and brain vessels. Several transmitters released by astrocytes and exerting their action on several receptor classes expressed by astrocytes themselves influence their physiology. Here we found that APs are dynamically modulated by purines. In live imaging experiments carried out in rat hippocampal astrocytes, Gq-coupled P2Y1 receptor blockade with the selective antagonist MRS2179 (1 μM) or inhibition of its effector phospholipase C using U73122 (3 μM) produced APs retraction, while stimulation of the same receptor with the selective agonist 2MeSADP (100 μM) increased their number. Since astrocytes, among other transmitters, release ATP by several mechanisms including connexin hemichannels, we used the connexin hemichannel inhibitor carbenoxolone (100 μM) and APs retraction was observed. In our system we then measured expression or function of channels important for modulation of volume transmission and K+ buffering, aquaporin-4, and K+ inward rectifying (Kir) channels, respectively. Aquaporin-4 expression level did not change whereas, in whole-cell patch-clamp recordings performed to measure Kir current, we observed an increase in K+ current in all conditions where APs number was reduced. These data are supporting the idea of a dynamic modulation of astrocytic processes by purinergic signal, strengthening the role of purines in brain homeostasis.
Starting Page	4081
Ending Page	4093
Page Count	13
File Format	PDF
ISSN	08937648
Journal	Molecular Neurobiology
Volume Number	54
Issue Number	6
e-ISSN	15591182
Language	English
Publisher	Springer US
Publisher Date	2016-06-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	ATP Kir channels Aquaporin-4 Astrocytic processes Glia-neuron crosstalk Neurosciences Neurobiology Cell Biology Neurology
Content Type	Text
Resource Type	Article
Subject	Neurology Cellular and Molecular Neuroscience

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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