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Peritoneal macrophages express the serotonin transporter
M L Rudd1, A N Nicolas, B L Brown
1Department of Biology, Virginia Commonwealth University, Richmond, VA 23284, USA.
Journal of Neuroimmunology
|January 18, 2005
Summary
Researchers identified the serotonin transporter (SERT) in mouse macrophages using RT-PCR and Western blotting. This finding confirms a functional transporter responsible for serotonin uptake in these immune cells.
Area of Science:
- Immunology
- Neuroscience
- Molecular Biology
Background:
- Macrophages are known to internalize serotonin.
- However, the specific molecular transporter responsible for this uptake in macrophages has remained unidentified.
- Understanding serotonin transport in macrophages is crucial for comprehending neuro-immune interactions.
Purpose of the Study:
- To identify and characterize the serotonin transporter (SERT) in mouse peritoneal macrophages.
- To investigate the functional expression and regulation of SERT in macrophages.
Main Methods:
- Reverse transcription-polymerase chain reaction (RT-PCR) was employed to detect SERT mRNA.
- Sequencing was used to confirm the identity of the amplified SERT mRNA.
- Western blotting was performed to detect SERT protein expression.
- Functional uptake assays using radiolabeled serotonin were conducted.
Main Results:
- SERT mRNA was successfully detected in recruited mouse peritoneal macrophages.
- Sequencing confirmed the presence of mouse SERT mRNA.
- SERT protein was also detected via Western blotting.
- Macrophage activation with lipopolysaccharide did not alter SERT mRNA or protein levels.
- Macrophages exhibited specific, sodium-dependent uptake of serotonin.
- This uptake was potently inhibited by fluoxetine and desipramine, indicating functional SERT activity.
Conclusions:
- The serotonin transporter (SERT) is expressed at both mRNA and protein levels in mouse peritoneal macrophages.
- Macrophages possess a functional SERT that mediates serotonin uptake.
- SERT expression in macrophages is not modulated by lipopolysaccharide activation.
- This study identifies SERT as a key mediator of serotonin handling in macrophages, with implications for neuroinflammation and immune cell function.