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Majonoside-R2 reverses social isolation stress-induced decrease in pentobarbital sleep in mice: possible involvement
T T Nguyen1, K Matsumoto, K Yamasaki
1Department of Pharmacology, Research Institute for Wakan-Yaku (Oriental Medicines), Toyama Medical and Pharmaceutical University, Sugitani, Japan.
Life Sciences
|January 1, 1997
Summary
Majonoside-R2 (MR2) from Vietnamese ginseng reverses social isolation stress effects on sleep in mice. This action involves the neurosteroid site of the GABA(A) receptor complex, suggesting a potential therapeutic mechanism.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- Social isolation stress can negatively impact sleep patterns.
- Ginseng saponins, like Majonoside-R2 (MR2), are being investigated for their pharmacological effects.
- The GABA(A) receptor complex and its neurosteroid sites play a crucial role in regulating sleep and stress responses.
Purpose of the Study:
- To investigate the effect of Majonoside-R2 (MR2) on social isolation stress-induced decrease in pentobarbital sleep in mice.
- To elucidate the potential involvement of neurosteroidal sites of the GABA(A) receptor complex in MR2's pharmacological activity.
Main Methods:
- Administration of MR2, allotetrahydrodeoxycorticosterone (allo-THDOC), and alpha-helical CRF (alpha hCRF) to mice subjected to social isolation stress.
- Assessment of pentobarbital-induced sleep duration.
- Investigation of the modulatory effects of pregnenolone sulfate (a neurosteroid) and CRF on MR2's activity.
Main Results:
- MR2 dose-dependently reversed the decrease in pentobarbital sleep caused by social isolation stress.
- The effects of MR2 and allo-THDOC were attenuated by pregnenolone sulfate, indicating interaction with the neurosteroid site.
- MR2, allo-THDOC, and alpha hCRF reversed sleep decreases induced by pregnenolone sulfate and CRF.
Conclusions:
- The findings suggest that MR2's ability to counteract stress-induced sleep disturbances is mediated through the neurosteroid site of the GABA(A) receptor complex.
- MR2 exhibits potential as a therapeutic agent for sleep disorders associated with stress.