D2-Like Dopamine Autoreceptor Activation Reduces Quantal Size in PC12 Cells
D2-Like Dopamine Autoreceptor Activation Reduces Quantal Size in PC12 Cells
复制标题
D2 样多巴胺自身受体激活可减少 PC12 细胞中的量子大小
DOI:
10.1523/jneurosci.18-15-05575.1998
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发表时间:
1998
期刊:
影响因子:
--
通讯作者:
D. Sulzer
中科院分区:
文献类型:
--
作者:
E. Pothos;S. Przedborski;Viviana Davila;Y. Schmitz;D. Sulzer
D2-like dopamine autoreceptors regulate dopamine release and are implicated in important actions of antipsychotic drugs and rewarding behaviors. To directly observe the effects of D2 autoreceptors on exocytic neurotransmitter release, we measured quantal release of dopamine from pheochromocytoma PC12 cells that express D2 and D4 autoreceptors. High potassium-evoked secretion in PC12 cells produced a unimodal population of quantal sizes. We found that exposures to the D2-like agonist quinpirole that inhibited tyrosine hydroxylase activity by ∼50% also reduced quantal size by ∼50%. The reduced quantal size was blocked by the D2 antagonist sulpiride and reversed byl-DOPA. Quinpirole also decreased the frequency of stimulation-evoked quantal release. Together, these findings indicate effects on quantal neurotransmission by D2-like dopamine autoreceptors previously distinguished as synthesis-modulating autoreceptors that regulate tyrosine hydroxylase activity versus impulse-regulating autoreceptors that modulate membrane potential. The results also provide an initial demonstration of a receptor-mediated mechanism that alters quantal size.
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影响因子:
3.6
作者:
Silvia,CP;King,GR;Lee,TH;Xue,ZY;Caron,MG;Ellinwood,EH
通讯作者:
Ellinwood,EH
影响因子:
3.6
作者:
Strait,KA;Kuczenski,R
通讯作者:
Kuczenski,R
DOI:
--
发表时间:
1988
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Griffith,LC;Schulman,H
通讯作者:
Schulman,H
DOI:
--
发表时间:
1989
期刊:
The Journal of pharmacology and experimental therapeutics
影响因子:
--
作者:
Bohmaker,K;Puza,T;Goldstein,M;Meller,E
通讯作者:
Meller,E
DOI:
--
发表时间:
1993
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Ramachandran,B;Houben,K;Rozenberg,YY;Haigh,JR;Varpetian,A;Howard,BD
通讯作者:
Howard,BD