Substrates dissociate dopamine transporter oligomers.

Abstract:

:Substrate-induced endocytic trafficking of dopamine transporter (DAT) has been observed, but little is known about the regulation of DAT oligomerization by substrate. The present study investigates the effect on substrates on DAT oligomerization and explores a potential link with the presence of DAT at the cell surface in human embryonic kidney cells transiently or stably expressing N-terminal tagged DAT constructs. Dopamine (100 microM) or amphetamine (2-10 microM) reduced Myc-DAT coimmunoprecipitated along with Flag-DAT (oligomeric DAT) in tandem with a reduction in surface DAT determined by biotinylation. Dopamine (10-1000 microM) and amphetamine (0.2-200 microM) reduced DAT oligomerization as assessed by cross-linking with copper sulfate phenanthroline or Cu2+. Inhibition of endocytosis by 10 microM phenylarsine oxide or 450 mM sucrose counteracted the effect of 10 microM DA or 2 microM amphetamine in reducing DAT cross-linking. In addition to overall similarities between the results with the two cross-linking agents and between the results with the two different endocytosis inhibitors, some differences were noted as well, likely related to the efficiency of the cross-linking process and the sulfhydryl-reactive properties of phenylarsine oxide, respectively. The present results are the first to indicate regulation of oligomerization of an solute carrier family 6 transporter, the DAT, by substrates that act at DAT. In addition, the present study opens up the possibility of an important linkage between oligomerization of DAT and endocytic or other modulatory mechanisms impacting surface DAT.

journal_name

J Neurochem

authors

Chen N,Reith ME

doi

10.1111/j.1471-4159.2007.05195.x

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

910-20

issue

3

eissn

0022-3042

issn

1471-4159

pii

JNC5195

journal_volume

105

pub_type

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