Single Quantum Dot Imaging Reveals PKCβ-Dependent Alterations in Membrane Diffusion and Clustering of an Attention-Deficit Hyperactivity Disorder/Autism/Bipolar Disorder-Associated Dopamine Transporter Variant.
Single Quantum Dot Imaging Reveals PKCβ-Dependent Alterations in Membrane Diffusion and Clustering of an Attention-Deficit Hyperactivity Disorder/Autism/Bipolar Disorder-Associated Dopamine Transporter Variant.
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DOI:
10.1021/acschemneuro.8b00350
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发表时间:
2019-01-16
影响因子:
5
通讯作者:
Rosenthal SJ
中科院分区:
文献类型:
--
作者:
Thal LB;Tomlinson ID;Quinlan MA;Kovtun O;Blakely RD;Rosenthal SJ
The dopamine transporter (DAT) is a transmembrane protein that terminates dopamine signaling in the brain by driving rapid dopamine reuptake into presynaptic nerve terminals. Several lines of evidence indicate that DAT dysfunction is linked to neuropsychiatric disorders such as attention-deficit/hyperactivity disorder (ADHD), bipolar disorder (BPD), and autism spectrum disorder (ASD). Indeed, individuals with these disorders have been found to express the rare, functional DAT coding variant Val559, which confers anomalous dopamine efflux (ADE) in vitro and in vivo. To elucidate the impact of the DAT Val559 variant on membrane diffusion dynamics, we implemented our antagonist-conjugated quantum dot (QD) labeling approach to monitor the lateral mobility of single particle-labeled transporters in transfected HEK-293 and SK-N-MC cells. Our results demonstrate significantly higher diffusion coefficients of DAT Val559 compared to those of DAT Ala559, effects likely determined by elevated N-terminal transporter phosphorylation. We also provide pharmacological evidence that PKCβ- mediated signaling supports enhanced DAT Val559 membrane diffusion rates. Additionally, our results are complimented with diffusion rates of phosphomimicked and phosphorylation-occluded DAT variants. Furthermore, we show DAT Val559 has a lower propensity for membrane clustering, which may be caused by a mutation-derived shift out of membrane microdomains leading to faster lateral membrane diffusion rates. These findings further demonstrate a functional impact of DAT Val559 and suggest that changes in transporter localization and lateral mobility may sustain ADE and contribute to alterations in dopamine signaling underlying multiple neuropsychiatric disorders.
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影响因子:
5.3
作者:
Gabriel, Luke R.;Wu, Sijia;Melikian, Haley E.
通讯作者:
Melikian, Haley E.
DOI:
10.1523/jneurosci.5094-09.2010
发表时间:
2010-04-28
期刊:
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子:
--
作者:
Bowton E;Saunders C;Erreger K;Sakrikar D;Matthies HJ;Sen N;Jessen T;Colbran RJ;Caron MG;Javitch JA;Blakely RD;Galli A
通讯作者:
Galli A
DOI:
10.1523/jneurosci.0048-12.2012
发表时间:
2012-06-27
期刊:
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子:
--
作者:
Chang JC;Tomlinson ID;Warnement MR;Ustione A;Carneiro AM;Piston DW;Blakely RD;Rosenthal SJ
通讯作者:
Rosenthal SJ
影响因子:
16.6
作者:
Anderluh A;Hofmaier T;Klotzsch E;Kudlacek O;Stockner T;Sitte HH;Schütz GJ
通讯作者:
Schütz GJ
影响因子:
5.3
作者:
Egana, Loreto A.;Cuevas, Rolando A.;Torres, Gonzalo E.
通讯作者:
Torres, Gonzalo E.