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Antidepressant-like effect of genipin in mice
Jun-Sheng Tian1, Yuan-Lu Cui, Li-Min Hu
1Key Laboratory of Pharmacology of Traditional Chinese Medical Formulae, Ministry of Education, Tianjin University of Traditional Chinese Medicine, Tianjin, PR China.
Abstract:
The present study aimed to investigate the antidepressant potential of genipin and its possible mechanisms. Mouse models of depression including the forced swimming test (FST) and the tail suspension test (TST) were used to evaluate the effects of genipin. A possible mechanism was explored in the test of antagonism of reserpine-induced ptosis and hypothermia in mice. The contents of monoamine neurotransmitters and their metabolites including epinephrine (NE), 5-hydroxytryptamine (5-HT) and 5-hydroxyindoleacetic acid (5-HIAA) in mice hippocampi were determined by HPLC-ECD. The results showed that intra-gastric administration of genipin at 50, 100, 200mg/kg or fluoxetine at 7.5mg/kg for 7 days significantly reduced the duration of immobility in FST and TST, while it did not affect the locomotor activity in the open field test (OFT). However, the effect was not dose-dependent. When the mice were treated with genipin or fluoxetine for 7 days, both of them could antagonize reserpine-induced ptosis and hypothermia. The 5-HT and NE contents in mice hippocampi were decreased after the peritoneal injection of reserpine at 2.0mg/kg. The pre-treatment with genipin at 50, 100, 200mg/kg or fluoxetine at 7.5mg/kg for 7 days could elevate the contents of NE and 5-HT in mice hippocampi significantly. The results suggest that compared with fluoxetine, genipin exerts antidepressant-like effects significantly. A possible mechanism, at least in part, is the regulation of the 5-HT and NE levels in the hippocampus.
Insights
Genipin demonstrates significant antidepressant-like effects in mouse models, comparable to fluoxetine. Its mechanism involves regulating hippocampal levels of serotonin (5-HT) and norepinephrine (NE).
Area of Science:
- Neuroscience
- Pharmacology
- Natural Product Research
Background:
- Depression is a prevalent mood disorder with complex pathophysiology.
- Natural compounds are increasingly explored for their therapeutic potential in treating depression.
- Genipin, a bioactive compound from Gardenia jasminoides, has shown promise but requires further investigation.
Purpose of the Study:
- To evaluate the antidepressant potential of genipin in established mouse models of depression.
- To elucidate the underlying neurochemical mechanisms of genipin's antidepressant effects.
- To compare genipin's efficacy with a standard antidepressant, fluoxetine.
Main Methods:
- Mouse models: Forced swimming test (FST) and tail suspension test (TST) for antidepressant activity.
- Open field test (OFT) to assess locomotor activity.
- Reserpine-induced ptosis and hypothermia models to explore mechanisms.
- High-performance liquid chromatography with electrochemical detection (HPLC-ECD) to quantify hippocampal monoamine neurotransmitters (epinephrine (NE), 5-hydroxytryptamine (5-HT)) and their metabolite (5-hydroxyindoleacetic acid (5-HIAA)).
Main Results:
- Genipin administration (50, 100, 200 mg/kg) significantly reduced immobility in FST and TST, indicating antidepressant-like effects.
- Genipin did not affect locomotor activity in the OFT, ruling out psychostimulant effects.
- Genipin antagonized reserpine-induced ptosis and hypothermia and significantly increased hippocampal NE and 5-HT levels, similar to fluoxetine.
Conclusions:
- Genipin exhibits significant antidepressant-like effects in mice.
- The antidepressant action of genipin is, at least partly, mediated by the modulation of hippocampal 5-HT and NE levels.
- Genipin represents a potential therapeutic agent for depression, warranting further clinical investigation.
