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. Author manuscript; available in PMC: 2019 Sep 19.
Published in final edited form as: ACS Chem Neurosci. 2018 Jun 8;9(9):2188–2204. doi: 10.1021/acschemneuro.8b00200

Table 1.

region no. first author (ref) summary
PFC 1 Joffe (88) Activation of mGlu3 promotes AMPA receptor internalization on pyramidal cells. LTD occurs at long-range inputs from BLA, but not VH, and does not occur on fast-spiking interneurons.
2 Di Menna/Joffe (84) mGlu3 enhances mGlu5-mediated signaling, including phosphoinositide production and Ca2+ mobilization. mGlu5 activity is also required for the induction of mGlu LTD.
3 Walker (99) Genetic deletion of mGlu3, but not mGlu2, blocks LTD induced by group II agonists. Inhibition of mGlu3 disrupts extinction of cued fear.
4 Joffe (100) mGlu3 LTD does not require the mobilization of intracellular Ca2+ stores. Instead, mGlu3 LTD proceeds through activation of PI3K and Akt. mGlu3 LTD is impaired by acute restraint stress.
5 Joffe (97) Glutamate release is enhanced by acute application of a group II mGlu receptor antagonist or mGlu2 NAM. Acute application of an mGlu3 NAM does not affect basal release probability.
6 Zhang (104) Application of a group III mGlu receptor agonist reduces glutamate released by serotonin. The specific mGlu receptor subtype mediating this effect is not known.
7 Lafourcade (44) Synaptic or pharmacologic stimulation of mGlu5 induces the production of 2-AG. 2-AG activates presynaptic CB1 receptors to induce LTD.
8 Cannady (21) mGlu5 activation inhibits SK channels, which normally act to inhibit NMDA receptor function. This mechanism promotes the induction of NMDA receptor LTP and extinciton of alcohol seeking.
NAC 9 McCutcheon (50) mGlu5 induces eCB LTD. Following extended cocaine exposure, mGlu5 function is impaired, and mGlu1 induces postsynaptic PKC-dependent LTD instead.
10 Loweth (61) Abstinence from cocaine exposure upregulates GluA2-lacking AMPA receptors. Activating mGlu1 depotentiates these synapses and reduces incubation of cocaine craving.
11 Turner (51) In the NAC shell, mGlu5 induces LTD at MDT inputs onto D1-expressing neurons. In contrast, mGlu1 activation generates LTD at PFC inputs onto both D1(+) and D1(−) MSNs.
12 Robbe (86) Group II mGlu receptor agonists induce presynaptic LTD. The mechanism involves cAMP, PKA, and the inhibition of P/Q type Ca2+ channels.
13 Robbe (48) mGlu5 induces canonical eCB LTD through intracellular Ca2+ mobilization and activation of presynaptic CB1 receptors.
14 Fourgeaud (98) A single administration of cocaine impairs mGlu5 LTD. This impairment requires in vivo activation of D1 and is associated with enhanced Homer expression and mGlu5 internalization.
15 Grueter (47) In the NAC core, mGlu5 LTD occurs specifically on D2-expressing neurons. AEA is released to activate CB1 as well as postsynaptic TRPV1, which promotes AMPA receptor internalization.
BNST 16 Grueter (28, 29) Activation of mGlu5 promotes the internalization of AMPA receptors. The mechanism requires the activation of ERK1 and is disrupted by repeated cocaine administration.
17 McElligott (30) mGlu5 LTD is distinct from LTD induced by aradrenergic receptor activation. mGlu5 LTD does not involve GluA2-lacking AMPA receptors and is not impaired by stress.
18 Grueter (113) Group II and group III mGlu receptor agonists depress excitatory transmission. Prolonged activation of group II mGu receptors induces LTD.
19 Gosnell (112) An mGlu8−specific agonist induces a transient depression of excitatory transmission, and mGlu4 does not appear to modulate presynaptic release probability.