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Dopamine Evokes a Trace Amine Receptor-dependent Inward Current that is Regulated by AMP Kinase in Substantia Nigra Dopamine Neurons.
Neuroscience ( IF 2.9 ) Pub Date : 2019-12-26 , DOI: 10.1016/j.neuroscience.2019.11.044
Wei Yang 1 , Adam C Munhall 2 , Steven W Johnson 3
Affiliation  

We reported recently that activators of AMP-activated protein kinase (AMPK) slow the rundown of current evoked by the D2 autoreceptor agonist quinpirole in rat substantia nigra compacta (SNC) dopamine neurons. The present study examined the effect of AMPK on current generated by dopamine, which unlike quinpirole, is a substrate for the dopamine transporter (DAT). Using whole-cell patch-clamp, we constructed current-voltage (I-V) plots while superfusing brain slices with dopamine (100 μM) for 25 min. Two minutes after starting superfusion, dopamine evoked a peak current with an average slope conductance of 0.97 nS and an estimated reversal potential (Erev) of -113 mV, which is near that expected for K+. But after 10 min of superfusion, dopamine-evoked currents had shifted to more depolarized values with a slope conductance of 0.64 nS and an Erev of -83 mV. This inward shift in current was completely blocked by the DAT inhibitor GBR12935. However, an AMPK blocking agent (dorsomorphin) permitted the emergence of inward current despite the continued presence of the DAT inhibitor. When D2 autoreceptors were blocked by sulpiride, I-V plots showed that dopamine evoked an inward current with an estimated slope conductance of 0.45 nS with an Erev of -57 mV. Moreover, this inward current was completely blocked by the trace amine-associated receptor 1 (TAAR1) antagonist EPPTB. These results suggest that dopamine activates a TAAR1-dependent non-selective cation current that is regulated by AMPK.

中文翻译:

多巴胺引起黑质多巴胺神经元中由AMP激酶调节的痕量胺受体依赖性内向电流。

我们最近报道,AMP激活的蛋白激酶(AMPK)的激活剂减慢了大鼠黑质致密部(SNC)多巴胺神经元中D2受体激动剂喹吡罗引起的电流下降。本研究检查了AMPK对多巴胺产生的电流的影响,与喹吡罗不同,多巴胺是多巴胺转运蛋白(DAT)的底物。使用全细胞膜片钳,我们构建了电流-电压(IV)图,同时将脑片与多巴胺(100μM)融合25分钟。开始灌注后两分钟,多巴胺引起峰值电流,平均斜率电导为0.97 nS,估计的反向电势(Erev)为-113 mV,接近于预期的K +。但是经过10分钟的灌注后,多巴胺诱发的电流已转变为更多的去极化值,斜率电导为0。64 nS和-83 mV的Erev。DAT抑制剂GBR12935完全阻止了电流的这种向内移动。但是,尽管DAT抑制剂持续存在,但AMPK阻断剂(吗啡吗啡)仍允许出现内向电流。当D2自身受体被舒必利阻断时,IV曲线显示多巴胺诱发内向电流,估计斜率电导为0.45 nS,Erev为-57 mV。此外,该内向电流完全被痕量胺相关受体1(TAAR1)拮抗剂EPPTB阻断。这些结果表明,多巴胺激活由AMPK调节的TAAR1依赖性非选择性阳离子电流。尽管DAT抑制剂持续存在,但AMPK阻断剂(dorsomorphin)允许出现内向电流。当D2自身受体被舒必利阻断时,IV曲线显示多巴胺诱发内向电流,估计斜率电导为0.45 nS,Erev为-57 mV。此外,该内向电流完全被痕量胺相关受体1(TAAR1)拮抗剂EPPTB阻断。这些结果表明,多巴胺激活由AMPK调节的TAAR1依赖性非选择性阳离子电流。尽管DAT抑制剂持续存在,但AMPK阻断剂(dorsomorphin)允许出现内向电流。当D2自身受体被舒必利阻断时,IV曲线显示多巴胺诱发内向电流,估计斜率电导为0.45 nS,Erev为-57 mV。此外,该内向电流完全被痕量胺相关受体1(TAAR1)拮抗剂EPPTB阻断。这些结果表明,多巴胺激活由AMPK调节的TAAR1依赖性非选择性阳离子电流。这种内向电流完全被痕量胺相关受体1(TAAR1)拮抗剂EPPTB阻断。这些结果表明,多巴胺激活由AMPK调节的TAAR1依赖性非选择性阳离子电流。这种内向电流完全被痕量胺相关受体1(TAAR1)拮抗剂EPPTB阻断。这些结果表明,多巴胺激活由AMPK调节的TAAR1依赖性非选择性阳离子电流。
更新日期:2019-12-27
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