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Animal Models of Depression - Chronic Despair Model CDM
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GRP Receptor Regulates Depression Behavior via Interaction With 5-HT2a Receptor
Dan Xiang1, Huiling Wang1, Siqi Sun1
1Department of Psychiatry, Renmin Hospital of Wuhan University, Wuhan, China.
Frontiers in Psychiatry
|February 13, 2020
Summary
Stress increases gastrin-releasing peptide receptor (GRPR) in rats, but fluoxetine treatment reverses this. GRPR interacts with the 5-HT2a receptor (5-HT2aR), offering new insights into depression.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Gastrin-releasing peptide receptor (GRPR) involvement in depression is suggested but not fully understood.
- The specific mechanisms linking GRPR to depression progression require elucidation.
Purpose of the Study:
- To investigate the impact of stress and antidepressant treatment on GRPR expression.
- To explore the cellular-level interactions between 5-HT2a receptor (5-HT2aR) and GRPR.
Main Methods:
- Established rat depression models using chronic unpredictable mild stress (CUMS).
- Administered fluoxetine treatment and assessed behavioral changes.
- Quantified GRPR mRNA and protein levels in the hypothalamus via real-time PCR and western blotting.
- Investigated 5-HT2aR and GRPR interaction in HEK293 cells using coimmunoprecipitation and immunofluorescence.
Main Results:
- CUMS induced depressive-like behaviors in rats, which were reversed by fluoxetine.
- Hypothalamic GRPR mRNA and protein levels were elevated by CUMS and normalized by fluoxetine.
- Demonstrated in vitro interaction and colocalization of 5-HT2aR and GRPR.
Conclusions:
- GRPR plays a role in the pathophysiology of depression.
- The interaction between 5-HT2aR and GRPR provides novel insights into depression pathogenesis.
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