Synapsin III (SynIII) is a neuron-specific phosphoprotein that plays a unique role in neuronal development. SynIII is phosphorylated by cAMP-dependent protein kinase (PKA) at a highly conserved phosphorylation site and by cyclin-dependent kinase-5 (Cdk5) at a newly described site. Although SynIII is known to be involved in axon elongation in vitro, the role of its phosphorylation by PKA and Cdk...

We examined the effects of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and epidermal growth factor (EGF) on the expression and kinase activity of cyclin-dependent kinase 5 (Cdk5) in Leydig TM3 and Sertoli TM4 cell lines. Hormonal regulation of the expression and activity of Cdk5 by using normal and hypophysectomized rat testes was also investigated to elucidate its role. Cdk5 ...

Cdk5 (cyclin-dependent kinase 5) is a serine/threonine kinase implicated to play pivotal roles in neuronal development. Recently, its potential involvement as a regulator of neuronal death and survival has attracted considerable interests. Importantly, increasing evidence has linked Cdk5 to the etiopathology of neurodegenerative diseases such as Alzheimer's disease and amyotrophic lateral scler...

The cyclin-dependent kinase member, Cdk5, is expressed in a variety of cell types, but neuron-specific expression of its activator, p35, is thought to limit its activity to neurons. Here we demonstrate that both Cdk5 and p35 are expressed in the human astrocytoma cell line, U373. Cdk5 and p35 are present in the detergent-insoluble cytoskeletal fraction of this cell line and Cdk5 localizes to fi...

Cyclin-dependent kinase 5 (CDK5), a neuronal kinase that functions in migration, has been found to be activated in some human cancers in which it has been implicated in promoting metastasis. In this study, we investigated the role of CDK5 in pancreatic cancers in which metastatic disease is most common at diagnosis. CDK5 was widely active in pancreatic cancer cells. Functional ablation signific...

Despite considerable progress in recent years, the overall prognosis of metastatic malignant melanoma remains poor, and curative therapeutic options are lacking. Therefore, better understanding of molecular mechanisms underlying melanoma progression and metastasis, as well as identification of novel therapeutic targets that allow inhibition of metastatic spread, are urgently required. The curre...

This Article contains errors in the Reference list. Reference 33 is incorrectly listed as reference 26 and references 26–32 are incorrectly listed as references 27–33 respectively. The correct references are listed below: 26 Zhang, J. et al. Nuclear localization of Cdk5 is a key determinant in the postmitotic state of neurons. 27 Liang, Z. et al. Cdk5 regulates activity-dependent gene expressio...

Insulin stimulation results in the activation of cyclin-dependent kinase-5 (CDK5) in lipid raft domains via a Fyn-dependent phosphorylation on tyrosine residue 15. In turn, activated CDK5 phosphorylates the Rho family GTP-binding protein TC10alpha on threonine 197 that is sensitive to the CDK5 inhibitor olomoucine and blocked by small interfering RNA-mediated knockdown of CDK5. The phosphorylat...

Yeasts p13suc1/p18CKS and their human homologues, p9CKShs1/p9CKShs2, strongly interact with p34cdc2 and p34cdk2. While attempting to purify the starfish oocyte p13suc1 homologue, we discovered a 15-kDa protein cross-reactive with anti-p9CKShs2/anti-p13suc1 antibodies. p15cdk-BP-Sepharose binds an anti-PSTAIRE cross-reactive protein of 33 kDa when loaded with starfish oocyte extracts. The p15cdk...

Cyclin-dependent kinase 5 (cdk5) is a serine/threonine kinase that, when activated, induces neurite outgrowth. Recent in vitro studies have shown that cdk5 phosphorylates tau at serine 199, serine 202, and threonine 205 and that p25, an activator of cdk5, is increased in Alzheimer disease (AD). Since tau is hyperphosphorylated at these sites in neurofibrillary tangles, we examined brain tissue ...