Abstract
Metabotropic glutamate (mGlu) receptors couple through G proteins to regulate a large number of cell functions. Eight mGlu receptor isoforms have been cloned and classified into three Groups based on sequence, signal transduction mechanisms and pharmacology. This review will focus on Group I mGlu receptors, comprising the isoforms mGlu1 and mGlu5. Activation of these receptors initiates both G protein-dependent and -independent signal transduction pathways. The G-protein-dependent pathway involves mainly Gαq, which can activate PLCβ, leading initially to the formation of IP3 and diacylglycerol. IP3 can release Ca2+ from cellular stores resulting in activation of Ca2+-dependent ion channels. Intracellular Ca2+, together with diacylglycerol, activates PKC, which has many protein targets, including ion channels. Thus, activation of the G-protein-dependent pathway affects cellular excitability though several different effectors. In parallel, G protein-independent pathways lead to activation of non-selective cationic currents and metabotropic synaptic currents and potentials. Here, we provide a survey of the membrane transport proteins responsible for these electrical effects of Group I metabotropic glutamate receptors.
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Ana Maria Bernal Correa declares that she has no conflicts of interest. Jennifer Diniz Soares Guimarães declares that she has no conflicts of interest. Everton dos Santos e Alhadas declares that he has no conflicts of interest. Christopher Kushmerick declares that he has no conflicts of interest.
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This article is part of a Special Issue on ‘Latin America’ edited by Pietro Ciancaglini and Rosangela Itri.
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Correa, A.M.B., Guimarães, J.D.S., dos Santos e Alhadas, E. et al. Control of neuronal excitability by Group I metabotropic glutamate receptors. Biophys Rev 9, 835–845 (2017). https://doi.org/10.1007/s12551-017-0301-7
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DOI: https://doi.org/10.1007/s12551-017-0301-7