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Cytoprotective effect is one of common action pathways for antidepressants
Yun-Feng Li1, Yan-Qin Liu, Wen-Chao Huang
1Institute of Pharmacology and Toxicology, Academy of Military Medical Sciences, Beijing 100850, China. LYF619@yahoo.com.cn
Aim:
To explore the possible common action mechanism of antidepressants.
Methods:
The cell viability was detected by MTT assay. The intracellular Ca2+ concentration ([Ca2+]i) was measured by Fura 2-AM fluorescence labeling assay. Using RT-PCR, the mRNA level of nerve growth factor (NGF) was also detected.
Results:
High concentration of corticosterone (0.2 mmol/L) was incubated with PC12 cells to simulate the lesion state of brain neurons in depressive illness. Three main kinds of antidepressants used in clinic [(1) tricyclic antidepressants (TCAs), such as desipramine (DIM) 0.625-10 micromol/L; (2) selective serotonin reuptake inhibitors (SSRIs), such as fluoxetine (FLU) 0.625-10 micromol/L; (3) monoamine oxidase inhibitors (MAOIs), such as moclobemide (MOC) 2.5-40 micromol/L] protected cells from the lesion induced by corticosterone. While antipsychotic drug chlorpromazine or anxiolytic agent diazepam 0.4-50 micromol/L had no such effect. Moreover, DIM 1, 5 micromol/L or FLU 1, 5 micromol/L attenuated the [Ca2+]i overload induced by corticosterone 0.1 mmol/L for 48 h in PC12 cells. Furthermore, treatment with DIM or FLU 10 micromol/L for 48 h elevated the NGF mRNA expression in PC12 cells.
Conclusion:
Despite a remarkable structural diversity, the cytoprotective effect can be viewed as the common action pathway of the antidepressants. Moreover, attenuation of the intracellular Ca2+ overload and elevation of neurotrophic factor (such as NGF) expression is one of the mechanisms of cytoprotective effect of antidepressants.
Insights
Antidepressants protect brain cells from damage by reducing intracellular calcium overload and increasing nerve growth factor (NGF). This cytoprotective effect is a common mechanism across different antidepressant classes.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Depression is linked to neuronal damage.
- Antidepressants have diverse structures but a common therapeutic goal.
- Understanding shared mechanisms is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the common mechanism of action for various antidepressants.
- To explore the cytoprotective effects of antidepressants on neuronal cells.
- To identify molecular pathways involved in antidepressant action.
Main Methods:
- PC12 cells were exposed to corticosterone to model neuronal damage.
- Cell viability was assessed using MTT assay.
- Intracellular calcium ([Ca2+]i) and nerve growth factor (NGF) mRNA levels were measured.
Main Results:
- Tricyclic antidepressants (TCAs), SSRIs, and MAOIs protected cells from corticosterone-induced damage.
- Antipsychotic and anxiolytic drugs did not show similar protective effects.
- Desipramine (DIM) and fluoxetine (FLU) reduced [Ca2+]i overload and increased NGF mRNA expression.
Conclusions:
- Cytoprotection is a common pathway for antidepressants, regardless of their structural class.
- Reducing intracellular calcium overload and enhancing neurotrophic factors like NGF are key antidepressant mechanisms.
- These findings offer insights into the neurobiological basis of antidepressant therapy.