Related Experiment Videos
Structure, function and regulation of the 5-hydroxytryptamine (serotonin) transporter
S Horschitz1, R Hummerich, P Schloss
1Central Institute of Mental Health, Biochemical Laboratory, J5, 68159 Mannheim, Germany. shorsch@as200.zi-mannheim.de
Biochemical Society Transactions
|November 16, 2001
Summary
Antidepressant treatment down-regulates serotonin transporter (SERT) expression, an effect that is reversible. Researchers also explored molecular mechanisms by investigating interactions between SERT and the noradrenaline transporter (NET).
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- The serotonin transporter (SERT) regulates serotonergic neurotransmission via 5-hydroxytryptamine (5-HT) re-uptake.
- Understanding SERT regulation and transport mechanisms is crucial for developing effective antidepressants.
Purpose of the Study:
- To investigate the regulatory effects of antidepressants on SERT expression.
- To explore the molecular mechanisms of substrate transport by examining SERT-NET interactions.
Main Methods:
- Chronic exposure of SERT to antidepressants (e.g., citalopram) followed by determination of transport and binding parameters.
- Cloning and pharmacological characterization of a chimeric rat SERT-rat NET construct in a heterologous expression system.
Main Results:
- Long-term citalopram exposure down-regulated SERT expression in a concentration- and time-dependent manner.
- SERT expression levels and function were reversible, with recovery observed 48 hours after treatment cessation.
- A chimeric SERT-NET construct was successfully created and characterized to study transporter interactions.
Conclusions:
- Antidepressants can reversibly alter SERT expression, impacting serotonergic neurotransmission.
- Chimeric transporter constructs provide a valuable tool for elucidating the molecular mechanisms of SERT and NET function and interaction.