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Isoliquiritigenin, a chalcone compound, enhances spontaneous inhibitory postsynaptic response
Junsung Woo1, Suengmok Cho2, C Justin Lee1
1Center for Neural Science and Functional Connectomics, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea. ; Neuroscience Program, University of Science and Technology (UST), Daejeon 305-350, Korea.
Experimental Neurobiology
|June 26, 2014
Summary
Isoliquiritigenin (ILTG) enhances sleep by modulating gamma-aminobutyric acid type A (GABAA) receptors. This study shows ILTG prolongs inhibitory synaptic responses in mouse brain neurons, suggesting a role in GABAergic transmission.
Area of Science:
- Neuroscience
- Pharmacology
- Molecular Biology
Background:
- Isoliquiritigenin (ILTG), a chalcone, exhibits antioxidant and anti-inflammatory properties.
- ILTG was recently identified to influence sleep via positive allosteric modulation of gamma-aminobutyric acid type A (GABAA)-benzodiazepine (BZD) receptors.
- The precise impact of ILTG on GABAA receptor-mediated synaptic activity in the brain remained unexplored.
Purpose of the Study:
- To investigate the effect of ILTG on GABAA receptor (GABAAR)-mediated synaptic responses.
- To determine if ILTG modulates spontaneous inhibitory postsynaptic currents (sIPSCs) in hippocampal neurons.
- To elucidate the role of GABAA-BZD receptors in ILTG's synaptic effects.
Main Methods:
- Electrophysiological recordings of spontaneous inhibitory postsynaptic currents (sIPSCs) in mouse hippocampal CA1 pyramidal neurons.
- Application of Isoliquiritigenin (ILTG) to assess its impact on synaptic current decay, amplitude, and frequency.
- Utilizing flumazenil (FLU), a specific antagonist for GABAA-BZD receptors, to confirm the mechanism of action.
Main Results:
- ILTG significantly prolonged the decay time of GABAAR-mediated sIPSCs in hippocampal neurons.
- ILTG did not alter the amplitude or frequency of sIPSCs.
- The effect of ILTG on sIPSC decay was completely blocked by flumazenil, indicating involvement of the GABAA-BZD receptor.
Conclusions:
- Isoliquiritigenin acts as a modulator of GABAergic synaptic transmission.
- ILTG's enhancement of inhibitory postsynaptic currents is mediated through GABAA-BZD receptors.
- These findings support a potential therapeutic role for ILTG in conditions involving GABAergic system dysfunction.
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