首页> 美国卫生研究院文献>The Journal of Biological Chemistry >A-Kinase Anchoring Protein (AKAP)-Lbc Anchors a PKN-based Signaling Complex Involved in α1-Adrenergic Receptor-induced p38 Activation
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A-Kinase Anchoring Protein (AKAP)-Lbc Anchors a PKN-based Signaling Complex Involved in α1-Adrenergic Receptor-induced p38 Activation

机译:A激酶锚定蛋白(AKAP)-Lbc锚定参与α1-肾上腺素受体诱导的p38活化的基于PKN的信号转导复合物。

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摘要

The mitogen-activated protein kinases (MAPKs) pathways are highly organized signaling systems that transduce extracellular signals into a variety of intracellular responses. In this context, it is currently poorly understood how kinases constituting these signaling cascades are assembled and activated in response to receptor stimulation to generate specific cellular responses. Here, we show that AKAP-Lbc, an A-kinase anchoring protein (AKAP) with an intrinsic Rho-specific guanine nucleotide exchange factor activity, is critically involved in the activation of the p38α MAPK downstream of α1b-adrenergic receptors (α1b-ARs). Our results indicate that AKAP-Lbc can assemble a novel transduction complex containing the RhoA effector PKNα, MLTK, MKK3, and p38α, which integrates signals from α1b-ARs to promote RhoA-dependent activation of p38α. In particular, silencing of AKAP-Lbc expression or disrupting the formation of the AKAP-Lbc·p38α signaling complex specifically reduces α1-AR-mediated p38α activation without affecting receptor-mediated activation of other MAPK pathways. These findings provide a novel mechanistic hypothesis explaining how assembly of macromolecular complexes can specify MAPK signaling downstream of α1-ARs.
机译:丝裂原激活的蛋白激酶(MAPK)通路是高度组织化的信号系统,可将细胞外信号转化为多种细胞内反应。在这种情况下,目前很少了解构成这些信号级联的激酶如何响应受体刺激而组装和活化以产生特异性细胞应答。在这里,我们显示AKAP-Lbc,一种具有内在Rho特异性鸟嘌呤核苷酸交换因子活性的A激酶锚定蛋白(AKAP),在α1b-肾上腺素能受体(α1b-ARs)下游p38αMAPK的激活中至关重要。 )。我们的结果表明,AKAP-Lbc可以组装一种新型的转导复合物,其中包含RhoA效应子PKNα,MLTK,MKK3和p38α,该复合物整合了来自α1b-ARs的信号以促进p38α的RhoA依赖性激活。特别是,沉默AKAP-Lbc表达或破坏AKAP-Lbc·p38α信号复合物的形成可特异性降低α1-AR介导的p38α激活,而不会影响其他MAPK途径的受体介导的激活。这些发现提供了新颖的机制假说,解释了大分子复合物的组装如何指定α1-ARs下游的MAPK信号传导。

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