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
中科院分区:
文献类型:
--
作者:
Dittmer PJ;Dell'Acqua ML;Sather WA
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.
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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
影响因子:
4.1
作者:
SANDBERG, M;BUTT, E;WALTER, U
通讯作者:
WALTER, U
影响因子:
64.8
作者:
BEAN, BP;NOWYCKY, MC;TSIEN, RW
通讯作者:
TSIEN, RW
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