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Published on: August 15, 2012
The neuroprotective agent MS-153 stimulates glutamate uptake
F Shimada1, Y Shiga, M Morikawa
1Laboratory of Molecular Pharmacology, Biosignal Research Center, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Japan.
European Journal of Pharmacology
|January 5, 2000
Summary
The neuroprotective agent MS-153 enhances glutamate uptake via the GLT-1 transporter, reducing extracellular glutamate levels. This mechanism contributes to its cerebroprotective effects in ischemic conditions.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Glutamate is a key excitatory neurotransmitter implicated in neuronal function and excitotoxicity.
- Glutamate transporters, particularly GLT-1 (a Na+/K+-dependent glial glutamate transporter), regulate extracellular glutamate levels.
- Dysregulation of glutamate homeostasis is associated with neurological disorders, including ischemic brain injury.
Purpose of the Study:
- To investigate the effect of the novel neuroprotective agent (R)-(-)-5-methyl-1-nicotinoyl-2-pyrazoline (MS-153) on glutamate uptake mediated by the GLT-1 transporter.
- To elucidate the mechanism by which MS-153 exerts its neuroprotective effects, particularly in the context of ischemia.
Main Methods:
- Assessed L-[3H]glutamate uptake in COS-7 cells expressing GLT-1, measuring the effects of varying MS-153 concentrations.
- Performed Eadie-Hofstee analysis to determine the kinetic parameters (Km) of glutamate uptake.
- Measured [3H]gamma-aminobutyric acid (GABA) uptake to assess transporter specificity.
- Recorded Na+ currents through GLT-1 in Xenopus oocytes.
- Investigated amino acid efflux from rat hippocampal slices under basal, high K+, and ischemic conditions (hypoxia/aglycemia) with and without MS-153 treatment.
Main Results:
- MS-153 (1-100 microM) demonstrated concentration- and time-dependent acceleration of L-[3H]glutamate uptake via GLT-1.
- Eadie-Hofstee analysis showed MS-153 significantly decreased the K(m) of glutamate uptake, indicating enhanced transporter affinity.
- MS-153 did not affect [3H]GABA uptake, suggesting specificity for glutamate transport.
- MS-153 increased Na+ currents through GLT-1.
- MS-153 attenuated KCl-induced glutamate efflux and partially inhibited ischemia-induced glutamate efflux from hippocampal slices.
- MS-153 had no significant effect on GABA efflux.
Conclusions:
- MS-153 enhances glutamate uptake by the GLT-1 transporter, likely through indirect modulation of transporter activity.
- The observed reduction in extracellular glutamate levels contributes to the cerebroprotective effects of MS-153 in an in vivo ischemic model.
- MS-153 represents a potential therapeutic agent for conditions involving glutamate excitotoxicity.
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