Integrating cardiac PIP3 and cAMP signaling through a PKA anchoring function of p110γ.

Integrating cardiac PIP3 and cAMP signaling through a PKA anchoring function of p110γ.
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DOI:
10.1016/j.molcel.2011.01.030
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发表时间:
2011-04-08
期刊:
影响因子:
16
通讯作者:
Hirsch E
Hirsch E
中科院分区:
生物学1区
文献类型:
--
作者:
Perino A;Ghigo A;Ferrero E;Morello F;Santulli G;Baillie GS;Damilano F;Dunlop AJ;Pawson C;Walser R;Levi R;Altruda F;Silengo L;Langeberg LK;Neubauer G;Heymans S;Lembo G;Wymann MP;Wetzker R;Houslay MD;Iaccarino G;Scott JD;Hirsch E

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心脏的肾上腺素能刺激参与 cAMP 和磷酸肌醇第二信使信号级联反应。心脏磷酸肌醇 3-激酶 p110γ 通过其催化功能维持 β-肾上腺素受体内化,并通过未知的激酶独立机制控制磷酸二酯酶 3B (PDE3B) 活性,从而参与这些过程。我们发现 p110γ 通过其 N 末端区域的一个位点锚定蛋白激酶 A (PKA)。锚定的 PKA 激活 PDE3B 以增强 cAMP 降解并磷酸化 p110γ 以抑制 PIP3 的产生。这提供了 PIP3 和 cAMP 信号事件的本地反馈控制。在充血性心力衰竭中,p110γ 上调并逃避 PKA 介导的抑制,导致 β-肾上腺素能受体密度降低。 p110γ 的药理抑制使 β-肾上腺素受体密度正常化并改善衰竭心脏的收缩力。
Adrenergic stimulation of the heart engages cAMP and phosphoinositide second messenger signaling cascades. Cardiac phosphoinositide 3-kinase p110γ participates in these processes by sustaining β-adrenergic receptor internalization through its catalytic function and by controlling phosphodiesterase 3B (PDE3B) activity via an unknown kinase-independent mechanism. We have discovered that p110γ anchors protein kinase A (PKA) through a site in its N-terminal region. Anchored PKA activates PDE3B to enhance cAMP degradation and phosphorylates p110γ to inhibit PIP3 production. This provides local feedback control of PIP3 and cAMP signaling events. In congestive heart failure, p110γ is upregulated and escapes PKA-mediated inhibition, contributing to a reduction in β-adrenergic receptor density. Pharmacological inhibition of p110γ normalizes β-adrenergic receptor density and improves contractility in failing hearts.
时空信号传导:蛋白质聚集在一起以及它们分开的位置。
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