Neuronal Calcium and cAMP Cross-Talk Mediated by Cannabinoid CB Receptor and EF-Hand Calcium Sensor Interactions
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Neuronal Calcium and cAMP Cross-Talk Mediated by Cannabinoid CB Receptor and EF-Hand Calcium Sensor Interactions. / Angelats, Edgar; Requesens, Marta; Aguinaga, David; Kreutz, Michael R; Franco, Rafael; Navarro, Gemma.
in: FRONT CELL DEV BIOL, Jahrgang 6, 19.07.2018, S. 67.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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T1 - Neuronal Calcium and cAMP Cross-Talk Mediated by Cannabinoid CB Receptor and EF-Hand Calcium Sensor Interactions
AU - Angelats, Edgar
AU - Requesens, Marta
AU - Aguinaga, David
AU - Kreutz, Michael R
AU - Franco, Rafael
AU - Navarro, Gemma
PY - 2018/7/19
Y1 - 2018/7/19
N2 - Endocannabinoids are important players in neural development and function. They act via receptors, whose activation inhibits cAMP production. The aim of the paper was to look for calcium- and cAMP-signaling cross-talk mediated by cannabinoid CB1 receptors (CB1R) and to assess the relevance of EF-hand CaM-like calcium sensors in this regard. Using a heterologous expression system, we demonstrated that CB1R interacts with calneuron-1 and NCS1 but not with caldendrin. Furthermore, interaction motives were identified in both calcium binding proteins and the receptor, and we showed that the first two sensors competed for binding to the receptor in a Ca2+-dependent manner. Assays in neuronal primary cultures showed that, CB1R-NCS1 complexes predominate at basal Ca2+ levels, whereas in the presence of ionomycin, a calcium ionophore, CB1R-calneuron-1 complexes were more abundant. Signaling assays following forskolin-induced intracellular cAMP levels showed in mouse striatal neurons that binding of CB1R to NCS1 is required for CB1R-mediated signaling, while the binding of CB1R to calneuron-1 completely blocked Gi-mediated signaling in response to a selective receptor agonist, arachidonyl-2-chloroethylamide. Calcium levels and interaction with calcium sensors may even lead to apparent Gs coupling after CB1R agonist challenge.
AB - Endocannabinoids are important players in neural development and function. They act via receptors, whose activation inhibits cAMP production. The aim of the paper was to look for calcium- and cAMP-signaling cross-talk mediated by cannabinoid CB1 receptors (CB1R) and to assess the relevance of EF-hand CaM-like calcium sensors in this regard. Using a heterologous expression system, we demonstrated that CB1R interacts with calneuron-1 and NCS1 but not with caldendrin. Furthermore, interaction motives were identified in both calcium binding proteins and the receptor, and we showed that the first two sensors competed for binding to the receptor in a Ca2+-dependent manner. Assays in neuronal primary cultures showed that, CB1R-NCS1 complexes predominate at basal Ca2+ levels, whereas in the presence of ionomycin, a calcium ionophore, CB1R-calneuron-1 complexes were more abundant. Signaling assays following forskolin-induced intracellular cAMP levels showed in mouse striatal neurons that binding of CB1R to NCS1 is required for CB1R-mediated signaling, while the binding of CB1R to calneuron-1 completely blocked Gi-mediated signaling in response to a selective receptor agonist, arachidonyl-2-chloroethylamide. Calcium levels and interaction with calcium sensors may even lead to apparent Gs coupling after CB1R agonist challenge.
KW - Journal Article
U2 - 10.3389/fcell.2018.00067
DO - 10.3389/fcell.2018.00067
M3 - SCORING: Journal article
C2 - 30073165
VL - 6
SP - 67
JO - FRONT CELL DEV BIOL
JF - FRONT CELL DEV BIOL
SN - 2296-634X
ER -