Bernard Laura P, Zhang Huaye
Department of Neuroscience and Cell Biology, Robert Wood Johnson Medical School, Rutgers, the State University of New Jersey, Piscataway, New Jersey, United States of America.
PLoS One. 2015 May 1;10(5):e0124816. doi: 10.1371/journal.pone.0124816. eCollection 2015.
The Par1 kinases, also known as microtubule affinity-regulating kinases (MARKs), are important for the establishment of cell polarity from worms to mammals. Dysregulation of these kinases has been implicated in autism, Alzheimer's disease and cancer. Despite their important function in health and disease, it has been unclear how the activity of MARK/Par1 is regulated by signals from cell surface receptors. Here we show that MARK/Par1 is activated downstream of NMDA receptors in primary hippocampal neurons. Further, we show that this activation is dependent on protein kinase A (PKA), through the phosphorylation of Ser431 of Par4/LKB1, the major upstream kinase of MARK/Par1. Together, our data reveal a novel mechanism by which MARK/Par1 is activated at the neuronal synapse.
Par1激酶,也被称为微管亲和力调节激酶(MARKs),对于从蠕虫到哺乳动物的细胞极性建立至关重要。这些激酶的失调与自闭症、阿尔茨海默病和癌症有关。尽管它们在健康和疾病中具有重要功能,但尚不清楚MARK/Par1的活性是如何受到细胞表面受体信号调节的。在这里,我们表明MARK/Par1在原代海马神经元中在NMDA受体下游被激活。此外,我们表明这种激活依赖于蛋白激酶A(PKA),通过Par4/LKB1(MARK/Par1的主要上游激酶)的Ser431位点磷酸化实现。总之,我们的数据揭示了一种在神经元突触处激活MARK/Par1的新机制。