Search results for " tyrosine"

Oxidative stress, a new hallmark in the pathophysiology of Lafora progressive myoclonus epilepsy

2015

12 páginas, 4 figuras, 1 tabla

Ubiquitin conjugating enzyme E2-N and sequestosome-1 (p62) are components of the ubiquitination process mediated by the malin-laforin E3-ubiquitin li…

2015

11 páginas, 9 figuras.

Light-induced resistance of the keratin network to the filament-disrupting tyrosine phosphatase inhibitor orthovanadate.

2003

Epidermal keratinocytes respond to low-dose light irradiation by inducing signaling cascades that lead to long-term effects on gene transcription thereby protecting cells against damage. In contrast, little is known about immediate light-induced alterations of structural proteins. We have made the intriguing observation that light produces fundamental changes in the properties of the keratin filament system of cultured epidermoid A-431 cells. A short light exposure (1–10 min) causes the keratin cytoskeleton to become immediately resistant to the tyrosine phosphatase inhibitor orthovanadate, which otherwise disrupts the keratin filament network completely in just a few minutes. This protecti…

Thérapies ciblées et diabète

2017

Rat tyrosine kinase inhibitor shows sequence similarity to human α2-HS glycoprotein and bovine fetuin

1991

Human alpha 2-HS glycoprotein and bovine fetuin, abundant proteins of fetal plasma, are structural members of the fetuin family within the cystatin superfamily. They are characterized by the presence of two N-terminally located cystatin-like units and a unique C-terminal sequence segment not present in the other members of the cystatin superfamily. Search for related sequences revealed that the natural inhibitor of the insulin receptor tyrosine kinase [Auberger, Falquerho, Contreres, Pages, Le Cam, Rossi & Le Cam (1989) Cell (Cambridge, Mass.) 58, 631-640] shows sequence similarity to the mammalian fetuins. The sequence identity between rat tyrosine kinase inhibitor, human alpha 2-HS gl…

Bruton tyrosine kinase-like protein, BtkSD, is present in the marine sponge Suberites domuncula.

2003

Sponges, the simplest and most ancient phylum of Metazoa, encode in their genome complex and highly sophisticated proteins that evolved together with multicellularity and are found only in metazoan animals. We report here the finding of a Bruton tyrosine kinase (BTK)-like protein in the marine sponge Suberites domuncula (Demospongiae). The nucleotide sequence of one sponge cDNA predicts a 700-aa-long protein, which contains all of the characteristic domains for the Tec family of protein tyrosine kinases (PTKs). The highest homology (38% identity, 55% overall similarity) was found with human BTK and TEC PTKs. Sponge PTK was therefore named BtkSD. Human BTK is involved in the maturation of B …

2012

Cancer is a major cause of death worldwide and angiogenesis is critical in cancer progression. Development of new blood vessels and nutrition of tumor cells are heavily dependent on angiogenesis. Thus, angiogenesis inhibition might be a promising approach for anticancer therapy. Anti-angiogenic small molecule and phytochemicals as a cancer treatment approach are focused in these main points; modes of action, adverse effects, mechanisms of resistance and new developments. Treatment with anti-angiogenic compounds might be advantageous over conventional chemotherapy due to the fact that those compounds mainly act on endothelial cells, which are genetically more stable and homogenous compared t…

DSD-1-Proteoglycan/Phosphacan and Receptor Protein Tyrosine Phosphatase-Beta Isoforms during Development and Regeneration of Neural Tissues

2007

Interactions between neurons and glial cells play important roles in regulating key events of development and regeneration of the CNS. Thus, migrating neurons are partly guided by radial glia to their target, and glial scaffolds direct the growth and directional choice of advancing axons, e.g., at the midline. In the adult, reactive astrocytes and myelin components play a pivotal role in the inhibition of regeneration. The past years have shown that astrocytic functions are mediated on the molecular level by extracellular matrix components, which include various glycoproteins and proteoglycans. One important, developmentally regulated chondroitin sulfate proteoglycan is DSD-1-PG/phosphacan,…

Ibrutinib Abrogates TREM-1 Mediated Neutrophil Activation

2016

Abstract Triggering receptor expressed on myeloid cells 1 (TREM-1) is an activating receptor on neutrophils (PMN) and important in the innate host defence against microbial pathogens. Here we examined the influence of the Bruton tyrosine kinase (BTK) inhibitor ibrutinib on TREM-1 dependent activation of human PMNs. Firstly, ibrutinib specifically inhibited TREM-1 mediated PMN activation of the oxidative burst and CD62L shedding, whereas TLR mediated activation remained unaffected. Correspondingly, ibrutinib suppressed ERK phosphorylation after TREM-1, but not after TLR ligation. To clarify whether this TREM-1 specific effect of ibrutinib was also relevant in vivo, we treated mice with ibrut…

Mechanisms of Resistance to the FLT3-Tyrosine Kinase Inhibitor PKC412 in Patients with AML.

2004

Abstract The FLT3 receptor tyrosine kinase is expressed in 70-90% of cases of AML. Up to 35% of patients with AML show mutations in the JM-region or kinase domain of FLT3. These lead to autophosphorylation promoting ligand-independent cell proliferation and inhibition of apoptosis. Treatment with FLT3 tyrosine kinase inhibitors (TKI) is a promising tool in therapy of AML. Preliminary results investigating the FLT3-TKI PKC412 in patients with relapsed/refractory AML revealed that 11/15 patients (73%) with mutated FLT3 and 16/46 patients (35%) with WT FLT3 showed a >50% blast response in peripheral blood (Estey E et al. Blood.2003; 102:919a). Despite its remarkable efficacy in reducing…