Ca2+/calcineurin-dependent inactivation of neuronal L-type Ca2+ channels requires priming by AKAP-anchored protein kinase A.

Ca2+/calcineurin-dependent inactivation of neuronal L-type Ca2+ channels requires priming by AKAP-anchored protein kinase A.
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DOI:
10.1016/j.celrep.2014.04.039
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发表时间:
2014-06-12
期刊:
影响因子:
8.8
通讯作者:
Sather WA
Sather WA
中科院分区:
生物学1区
文献类型:
--
作者:
Dittmer PJ;Dell'Acqua ML;Sather WA

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在神经元内,电压门控 L 型 Ca2+ 通道的 Ca2+ 依赖性失活 (CDI) 形成细胞质 Ca2+ 信号。 CDI 是由 Ca2+ 与通道相关钙调蛋白结合启动的,随后 Ca2+/钙调蛋白激活 Ca2+ 依赖性磷酸酶钙调神经磷酸酶 (CaN),而钙调神经磷酸酶通过 A 激酶锚定蛋白 AKAP79/150 靶向 L 通道。在这里,我们报道了神经元L通道的CDI通过抑制PKA活性或PKA锚定到AKAP79/150而被消除,并且CDI也通过刺激PKA活性而被抑制。虽然 CDI 通过 PKA 的正向或负向操作而减少,但干扰 PKA 锚定或活性会降低 Ca2+ 电流密度,而刺激 PKA 活性则会升高它。相反,抑制 CaN 会降低 CDI,但对电流密度没有影响。这些结果表明,其中 PKA 依赖性磷酸化增强神经元 L 电流,从而启动通道进行 CDI,而 Ca2+/钙调蛋白激活的 CaN 通过逆转 PKA 介导的通道活性增强来驱动 CDI。
Within neurons, Ca2+-dependent inactivation (CDI) of voltage-gated L-type Ca2+ channels shapes cytoplasmic Ca2+ signals. CDI is initiated by Ca2+ binding to channel-associated calmodulin and subsequent Ca2+/calmodulin activation of the Ca2+-dependent phosphatase, calcineurin (CaN), which is targeted to L channels by by the A-kinase anchoring protein, AKAP79/150. Here we report that CDI of neuronal L channels was abolished by inhibition of PKA activity or PKA anchoring to AKAP79/150, and that CDI was also suppressed by stimulation of PKA activity. Although CDI was reduced by positive or negative manipulation of PKA, interference with PKA anchoring or activity lowered Ca2+ current density whereas stimulation of PKA activity elevated it. In contrast, inhibition of CaN reduced CDI but had no effect on current density. These results suggest a model wherein PKA-dependent phosphorylation enhances neuronal L current, thereby priming channels to undergo CDI, and Ca2+/calmodulin-activated CaN actuates CDI by reversing PKA-mediated enhancement of channel activity.
DOI: 10.1523/jneurosci.2302-12.2012
发表时间: 2012-10-31
期刊: The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子: --
作者:
Oliveria SF;Dittmer PJ;Youn DH;Dell'Acqua ML;Sather WA
通讯作者: Sather WA
DOI: 10.1038/307371a0
发表时间: 1984-01-01
期刊: NATURE
影响因子: 64.8
作者:
BEAN, BP;NOWYCKY, MC;TSIEN, RW
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DOI: 10.1085/jgp.92.4.531
发表时间: 1988-10-01
影响因子: 3.8
作者:
KALMAN, D;OLAGUE, PH;ARMSTRONG, DL
通讯作者: ARMSTRONG, DL
DOI: 10.1073/pnas.76.3.1497
发表时间: 1979-01-01
影响因子: 11.1
作者:
TILLOTSON, D
通讯作者: TILLOTSON, D