Abstract
The majority of antidepressants facilitate monoamine neurotransmission within the central nervous system as their initial neurochemical processing event. These medicines do not fully serve patient needs in terms of response or remission, and suffer from some compliance issues. Among the various approaches that are being taken to discover improved therapeutics for major depressive disorders has been the targeting of the metabotropic glutamate receptors. Three major classes of mGlu receptors with a total of eight subtypes (mGlu1–8) have been considered. The bulk of data at present provides compelling evidence that mGlu5 and mGlu2/3 receptors are principal protein targets for drug discovery. These mGlu receptors have localization within primary mood circuits and are modulated by antidepressant treatment. Moreover, pharmacological blockade of mGlu5 (with MPEP, MTEP) or mGlu2/3 (with LY341495, MGS0039) receptors is associated with antidepressant-like biochemical and neurochemical changes in the mammalian brain. Small molecules that target these sites have been identified that display corresponding antidepressant-like behavioral effects. Agonist actions at mGlu2/3 receptors, demonstrated to possess anxiolytic activity in humans, might also be capable of impacting the progression of disease symptoms. Importantly, modulation of the mGlu5 and mGlu2/3 receptors impact ionotropic glutamate receptor signaling (NMDA, AMPA) that independently has been associated with mood disorders. The lack of biochemical and behavioral evidence linking other mGlu receptors to mood disorders is generally due to the absence of an appropriate arsenal of tools (e.g., selective, systemically-available compounds). However, there are data suggesting that mGlu1, mGlu7, and mGlu8 receptors might also play important roles in controlling mood. In contrast, mGlu6 receptors, with localization principally confined to retinal cells, are not likely candidate proteins. The patent and scientific literature suggests that the evaluation of these hypotheses in the clinic might be possible in the near future. With these awaited studies is the hope for new medicines for the devastating and life-threatening diseases of mood that affect large segments of the world community.
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Abbreviations
- ACPD:
-
1-aminocyclopentane-trans-1,3R-dicarboxylic acid
- ACPT-I:
-
(1S,3R,4S)-1-aminocyclo-pentane-1,3,4-tricarboxylic acid
- AMN082:
-
N,N′-dibenzyhydryl-ethane-1,2-diamine dihydrochloride
- AMPA:
-
α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid
- BDNF:
-
Brain-derived neurotrophic factor
- cAMP:
-
Adenosine 3′,5′-cyclic monophosphate
- CNS:
-
Central nervous system
- CPPG:
-
(RS)-alpha-cyclopropyl-4-phosphonophenyl glycine
- DCG-IV:
-
((2S,2′R,3′R)-2-(2′,3′-dicarboxycyclopropyl)glycine)
- ECT:
-
Electroconvulsive treatment
- EMQMCM:
-
(3-ethyl-2-methyl-quinolin-6-yl)-(4-methoxy-cyclohexyl)-methanone methanesulfonate
- FST:
-
Forced swim test
- L-CCG-I:
-
(2S,1'S,2'S)-2-(carboxycyclopropyl)glycine
- LY341495:
-
9H-xanthene-9-propanoic acid, α-amino-α-[(1S,2S)-2- carboxycyclopropyl]-(αS)-(9CI)
- mGlu:
-
Metabotropic glutamate
- MPEP:
-
2-methyl-6-(phenylethynyl)pyridine
- MSG0039:
-
2-amino-3-[(3,4-dichlorophenyl)methoxy]-6-fluoro-(1R,2R,3R,5R,6R)-(9CI)
- MTEP:
-
3-[(2-methyl-1,3-thiazol-4-yl)ethynyl]pyridine
- NBQX:
-
2,3-dihydroxy-6-nitro-7-sulfamoylbenzo(f)quinoxaline
- NMDA:
-
N-methyl-D-aspartate
- PHCCC:
-
N-phenyl-7-(hydroxyimino)cyclopropa[b]chromen-1acarboxamide
- (R,S)-PPG:
-
(RS)-4-phosphonophenylglycine
- SSRI:
-
Selective serotonin reuptake inhibitors
- TST:
-
Tail suspension test
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Acknowledgments
I thank the following colleagues for previous discussions that have helped shape some of the thoughts expressed here: Andrew J. Alt, David Bleakman, Shigeyuki Chaki, Gerard J. Marek, Andrzej Pilc, Gabriel Nowak, Darryle D. Schoepp, and Phil Skolnick.
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Witkin, J.M. (2010). Glutamatergic Modulators for the Treatment of Major Depressive Disorder: Metabotropic Glutamate Receptors. In: Skolnick, P. (eds) Glutamate-based Therapies for Psychiatric Disorders. Milestones in Drug Therapy. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0346-0241-9_4
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