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Phorbol esters alter functions of the expressed dopamine transporter
1Department of Pharmacology, Hiroshima University School of Dentistry, Japan.
European Journal of Pharmacology
|July 15, 1994
Summary
Protein kinase C activation modulates dopamine transporter function. This enzyme
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Neurotransmitter transporters are crucial for synaptic regulation.
- Protein kinase C (PKC) is implicated in cellular signaling pathways.
- The role of PKC in dopamine transporter (DAT) function requires further investigation.
Purpose of the Study:
- To investigate the effect of protein kinase C activation on the function of the rat dopamine transporter.
- To determine how PKC modulates DAT binding and uptake kinetics.
Main Methods:
- Expressing rat DAT in COS cells.
- Treating cells with PKC activators (phorbol 12-myristate 13-acetate [PMA] and 1-oleoyl-2-acetyl-sn-glycerol [OAG]).
- Measuring [3H]dopamine uptake and [3H](-)-2 beta-carbomethoxy-3 beta-(4-fluorophenyl)tropane [WIN 35,428] binding kinetics.
Main Results:
- PMA treatment reduced WIN 35,428 binding affinity without altering Bmax.
- PMA decreased [3H]dopamine uptake velocity and Na+ affinity, but not dopamine affinity.
- OAG mimicked the effects of PMA on DAT function.
Conclusions:
- PKC activation alters both ligand recognition and substrate translocation of the dopamine transporter.
- In vitro phosphorylation of DAT by PKC suggests a potential physiological role in regulating dopaminergic neurotransmission.