Inhibitory effect of selective serotonin reuptake inhibitors on the vesicular monoamine transporter 2
The neuronal vesicular monoamine transporter (VMAT2) is the target molecule of action of some psychostimulants, such as methamphetamine and 3,4-methylenedioxymethamphetamine (MDMA). The present study examined the effect of antidepressants, such as selective serotonin reuptake inhibitors (SSRIs), on...
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Published in | Neuroscience letters Vol. 454; no. 3; pp. 229 - 232 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Shannon
Elsevier Ireland Ltd
01.05.2009
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The neuronal vesicular monoamine transporter (VMAT2) is the target molecule of action of some psychostimulants, such as methamphetamine and 3,4-methylenedioxymethamphetamine (MDMA). The present study examined the effect of antidepressants, such as selective serotonin reuptake inhibitors (SSRIs), on VMAT2 activity by measuring adenosine triphosphate-dependent [
3H]dopamine uptake into synaptic vesicles prepared from rat striatum. SSRIs, fluoxetine, paroxetine, and fluvoxamine, inhibited vesicular [
3H]dopamine uptake
in vitro. The rank order of potency was reserpine
≫
fluoxetine, paroxetine
>
fluvoxamine, methamphetamine
>
MDMA. Moreover, kinetic analysis revealed that inhibition by reserpine, a typical VMAT2 inhibitor, was uncompetitive, decreasing maximum velocity and affinity for dopamine. Inhibition by fluoxetine was noncompetitive, only decreasing maximum velocity for dopamine. These results suggest that fluoxetine inhibited the activity of VMAT2 by a mechanism different from that of reserpine and did not directly interact with the active site of VMAT2. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0304-3940 1872-7972 |
DOI: | 10.1016/j.neulet.2009.03.049 |