Tyrosine 402 phosphorylation of Pyk2 is involved in ionomycin-induced neurotransmitter release.

Tyrosine 402 phosphorylation of Pyk2 is involved in ionomycin-induced neurotransmitter release.
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Pyk2 酪氨酸 402 磷酸化参与离子霉素诱导的神经递质释放

DOI:
10.1371/journal.pone.0094574
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Chen N
Chen N
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang Z;Zhang Y;Mou Z;Chu S;Chen X;He W;Guo X;Yuan Y;Takahashi M;Chen N

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在中枢神经系统中高度表达的蛋白酪氨酸激酶涉及许多神经过程。然而,蛋白质酪氨酸激酶与神经递质释放之间的关系仍然未知。在这项研究中,我们发现,离子霉素,钙离子载体,同时诱导异步神经递质释放和磷酸化的非受体蛋白酪氨酸激酶,脯氨酸丰富的酪氨酸激酶2(Pyk 2),在克隆大鼠嗜铬细胞瘤PC 12细胞和小脑颗粒细胞,而引入Pyk 2 siRNA显着抑制离子霉素诱导的神经递质释放。进一步的研究表明,Tyr-402(Y 402)在Pyk 2,而不是其他酪氨酸位点,进行快速磷酸化后,离子霉素诱导1分钟至2分钟。我们证明,突变体的Pyk 2 Y 402可以取消离子霉素诱导的多巴胺(DA)释放与重组Pyk 2及其突变体(Y 402 F,Y 579 F,Y 580 F,和Y881 F)的转染细胞。此外,Src抑制可延长Pyk 2 Y 402的磷酸化,增加DA的释放。这些发现表明Pyk 2通过磷酸化Y 402参与离子霉素诱导的神经递质释放。
Protein tyrosine kinases, which are highly expressed in the central nervous system, are implicated in many neural processes. However, the relationship between protein tyrosine kinases and neurotransmitter release remains unknown. In this study, we found that ionomycin, a Ca2+ ionophore, concurrently induced asynchronous neurotransmitter release and phosphorylation of a non-receptor protein tyrosine kinase, proline-rich tyrosine kinase 2 (Pyk2), in clonal rat pheochromocytoma PC12 cells and cerebellar granule cells, whereas introduction of Pyk2 siRNA dramatically suppressed ionomycin-induced neurotransmitter release. Further study indicated that Tyr-402 (Y402) in Pyk2, instead of other tyrosine sites, underwent rapid phosphorylation after ionomycin induction in 1 min to 2 min. We demonstrated that the mutant of Pyk2 Y402 could abolish ionomycin-induced dopamine (DA) release by transfecting cells with recombinant Pyk2 and its mutants (Y402F, Y579F, Y580F, and Y881F). In addition, Src inhibition could prolong phosphorylation of Pyk2 Y402 and increase DA release. These findings suggested that Pyk2 was involved in ionomycin-induced neurotransmitter release through phosphorylation of Y402.
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