a(CHEBI:staurosporine)

Entity

Name

staurosporine

Namespace

chebi

Namespace Version

20180906

Namespace URL

https://raw.githubusercontent.com/pharmacome/terminology/b46b65c3da259b6e86026514dfececab7c22a11b/external/chebi-names.belns

Tau Modifications Sections of NESTOR

We treated these neurons with staurosporine, a broad-spectrum kinase inhibitor that induces apoptosis (Budd et al., 2000); rotenone, a complex inhibitor that induces mitochondrial dysfunction (Sherer et al., 2003); and rapamycin, an inhibitor of the mammalian target of the rapamycin (mTOR) signaling pathway with many downstream effects (Li et al., 2014) PubMed:27594586

The kinase activity was inhibited by staurosporine, isopentanyladenine and olomoucine in a dose dependent manner. Kinetic studies indicated Ki values of 39 nM, 38 microM and 8 microM, respectively for staurosporine, isopentanyladenine and olomoucine. PubMed:8726973

In parallel, phosphorylation of tau at Ser262 in MARK-transfected cells was investigated using a rabbit antibody recognizing phosphorylated Ser262 of tau (AGG5759) and a mouse anti-tau antibody (SC-21796) (Fig. S1a3). Tau was shown to interact with each of the transfected MARK isoforms (Fig. 1) and to be phosphorylated at Ser262 (Fig. 2). Staurosporine, a non-selective kinase inhibitor, significantly inhibited interactions between tau and each of the four MARK isoforms after treatment with 20 lM staurosporine for 1 h (Fig. 1; p = 0.02 for MARK1–, MARK2– and MARK3–tau interactions and p = 3 9 10-6 for MARK4–tau interaction). Treatment with staurosporine also significantly reduced PLA signals for tau phosphorylation at Ser262 (Fig. 2; p = 0.04 for MARK1- and p = 0.02 for MARK2- and MARK3- and p = 1 9 10-5 for MARK4-mediated tau phosphorylation) PubMed:23666762

Several kinases such as microtubule-affinity regulating kinase (MARK), protein kinase A, calcium calmodulin kinase II, and checkpoint kinase 2 are known to phosphorylate tau on Ser(262) in vitro. In this study, we took advantage of the in situ proximity ligation assay to investigate the role of MARK2, one of the four MARK isoforms, in AD. We demonstrate that MARK2 interacts with tau and phosphorylates tau at Ser(262) in stably transfected NIH/3T3 cells expressing human recombinant tau. Staurosporine, a protein kinase inhibitor, significantly reduced the interaction between MARK2 and tau, and also phosphorylation of tau at Ser(262). PubMed:23001711

Several kinases such as microtubule-affinity regulating kinase (MARK), protein kinase A, calcium calmodulin kinase II, and checkpoint kinase 2 are known to phosphorylate tau on Ser(262) in vitro. In this study, we took advantage of the in situ proximity ligation assay to investigate the role of MARK2, one of the four MARK isoforms, in AD. We demonstrate that MARK2 interacts with tau and phosphorylates tau at Ser(262) in stably transfected NIH/3T3 cells expressing human recombinant tau. Staurosporine, a protein kinase inhibitor, significantly reduced the interaction between MARK2 and tau, and also phosphorylation of tau at Ser(262). PubMed:23001711