Video_3_Transient Astrocytic Gq Signaling Underlies Remote Memory Enhancement.MOV (21.92 MB)
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posted on 22.03.2021, 04:18 by Youichi Iwai, Katsuya Ozawa, Kazuko Yahagi, Tsuneko Mishima, Sonam Akther, Camilla Trang Vo, Ashley Bomin Lee, Mika Tanaka, Shigeyoshi Itohara, Hajime Hirase

Astrocytes elicit transient Ca2+ elevations induced by G protein-coupled receptors (GPCRs), yet their role in vivo remains unknown. To address this, transgenic mice with astrocytic expression of the optogenetic Gq-type GPCR, Optoα1AR, were established, in which transient Ca2+ elevations similar to those in wild type mice were induced by brief blue light illumination. Activation of cortical astrocytes resulted in an adenosine A1 receptor-dependent inhibition of neuronal activity. Moreover, sensory stimulation with astrocytic activation induced long-term depression of sensory evoked response. At the behavioral level, repeated astrocytic activation in the anterior cortex gradually affected novel open field exploratory behavior, and remote memory was enhanced in a novel object recognition task. These effects were blocked by A1 receptor antagonism. Together, we demonstrate that GPCR-triggered Ca2+ elevation in cortical astrocytes has causal impacts on neuronal activity and behavior.

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