EGLU - CAS 170984-72-2
Category: Inhibitor
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Molecular Formula:
Molecular Weight:
EGLU is a group II mGluR antagonist and also a selective antagonist of presynaptically-mediated (1S,3S)-ACPD-induced depression of motoneuron excitation in neonatal rat spinal cord.
Brife Description:
group II mGluR antagonist
≥95% by HPLC
(2S)-α-Ethylglutamic acid; (2S)-2-amino-2-ethylpentanedioic acid
Canonical SMILES:
1.Characterization of (2S,2'R,3'R)-2-(2',3'-[3H]-dicarboxycyclopropyl)glycine binding in rat brain.
Mutel V;Adam G;Chaboz S;Kemp JA;Klingelschmidt A;Messer J;Wichmann J;Woltering T;Richards JG J Neurochem. 1998 Dec;71(6):2558-64.
[(2S,2'R,3'R)-2-(2',3'-[3H]Dicarboxycyclopropyl)glycine ([3H]DCG IV) binding was characterized in vitro in rat brain cortex homogenates and rat brain sections. In cortex homogenates, the binding was saturable and the saturation isotherm indicated the presence of a single binding site with a K(D) value of 180 +/- 33 nM and a Bmax of 780 +/- 70 fmol/mg of protein. The nonspecific binding, measured using 100 microM LY354740, was <30%. NMDA, AMPA, kainate, L(-)-threo-3-hydroxyaspartic acid, and (S)-3,5-dihydroxyphenylglycine were all inactive in [3H]DCG IV binding up to 1 mM. However, several compounds inhibited [3H]DCG IV binding in a concentration-dependent manner with the following rank order of potency: LY341495 = LY354740 > DCG IV = (2S,1'S,2'S)-2-(2-carboxycyclopropyl)glycine > (1S,3R)-1-aminocyclopentane-1,3-dicarboxylic acid > (2S,1'S,2'S)-2-methyl-2-(2-carboxycyclopropyl)glycine > L-glutamate = ibotenate > quisqualate > (RS)-alpha-methyl-4-phosphonophenylglycine = L(+)-2-amino-3-phosphonopropionic acid > (S)-alpha-methyl-4-carboxyphenylglycine > (2S)-alpha-ethylglutamic acid > L(+)-2-amino-4-phosphonobutyric acid. N-Acetyl-L-aspartyl-L-glutamic acid inhibited the binding in a biphasic manner with an IC50 of 0.
2.Group 1 and 2 metabotropic glutamate receptors play differential roles in hippocampal long-term depression and long-term potentiation in freely moving rats.
Manahan-Vaughan D J Neurosci. 1997 May 1;17(9):3303-11.
This study examined the role of metabotropic glutamate receptors (mGluRs) in hippocampal long-term depression (LTD) in vivo. The group 1 mGluR antagonist (S)4-carboxyphenylglycine (4CPG), group 1/2 antagonist (RS)-alpha-methyl-4-carboxyphenylglycine (MCPG), and group 2 antagonists (RS)-alpha-methylserine-O-phos-phate monophenyl ester (MSOPPE) and (2S)-alpha-ethylglutamic acid (EGLU) were used. The NMDA receptor antagonist D(-)-2-amino-5-phosphonopentanoic acid (AP5) was used to examine the NMDA receptor contribution to the observed LTD. Adult male Wistar rats underwent implantation of stimulating and recording electrodes into the Schaffer collaterals and CA1 stratum radiatum, respectively. After recovery of 5-7 d, the field EPSP was measured from freely moving animals. Drugs were applied either before or after 1 Hz low-frequency train (LFT) or 100 Hz stimulation via a cannula implanted in the lateral cerebral ventricle. Nine hundred pulses at 1 Hz produced an LTD that was marked and long-lasting. This LTD was completely inhibited by pre-LFT application of AP5. MCPG inhibited LTD from 2 hr post-LFT. 4CPG partially impaired LTD. MSOPPE and EGLU completely blocked induction of LTD, although short-term depression remained intact.
3.Selective activation of group II mGluRs with LY354740 does not prevent neuronal excitotoxicity.
Behrens MM;Strasser U;Heidinger V;Lobner D;Yu SP;McDonald JW;Won M;Choi DW Neuropharmacology. 1999 Oct;38(10):1621-30.
Recent reports have suggested a role for group II metabotropic glutamate receptors (mGluRs) in the attenuation of excitotoxicity. Here we examined the effects of the recently available group II agonist (+)-2-Aminobicyclo[3.1.0]hexane-2-6-dicarboxylic acid (LY354740) on N-methyl-D-aspartate (NMDA)-induced excitotoxic neuronal death, as well as on hypoxic-ischemic neuronal death both in vitro and in vivo. At concentrations shown to be selective for group II mGluRs expressed in cell lines (0.1-100 nM), LY354740 did not attenuate NMDA-mediated neuronal death in vitro or in vivo. Furthermore, LY354740 did not attenuate oxygen-glucose deprivation-induced neuronal death in vitro or ischemic infarction after transient middle cerebral artery occlusion in rats. In addition, the neuroprotective effect of another group II agonist, (S)-4-carboxy-3-phenylglycine (4C3HPG), which has shown injury attenuating effects both in vitro and in vivo, was not blocked by the group II antagonists (2 S)-alpha-ethylglutamic acid (EGLU), (RS)-alpha-methyl-4-sulphonophenylglycine (MSPG), or the group III antagonist (S)-alpha-methyl-3-carboxyphenylalanine (MCPA), suggesting that this neuroprotection may be mediated by other effects such as upon group I mGluRs.
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CAS 170984-72-2 EGLU

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