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astrocytoma/tyrosine
Veza se sprema u međuspremnik
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High uptake of L-3-[123I]iodo-alpha-methyl tyrosine in pilocytic astrocytomas.
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Despite a favourable prognosis, pilocytic astrocytomas may exhibit signs of malignancy on various neuroimaging modalities. This retrospective analysis was conducted to determine whether scintigraphic features of malignancy are also found on single-photon emission tomography (SPET) using
Increased expression in human astrocytomas of a 100 kDa protein with sequence homology to the ros tyrosine kinase domain.
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A monoclonal antibody against the v-ros synthetic peptide VWETLTLGQQPYPGLSN IEVL (amino acid residues 455-475 of v-ros), which is in the conserved region of the c-ros tyrosine kinase domain, was used for Western blotting of human astrocytoma specimens. High levels of a 100 kDa protein were detected
Tyrosine kinase expression in pediatric high grade astrocytoma.
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The over-expression of several receptor tyrosine kinases in adult high grade astrocytomas (HGA) led to trials of tyrosine kinase inhibitors in these patients. Similar molecular genetic analysis of pediatric HGA is only beginning to be published. Thus it is unclear to what degree these pathways are
Expression of tyrosine kinases FAK and Pyk2 in 331 human astrocytomas.
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The progression of malignancy from astrocytomas to glioblastomas remains clinically as well as histopathologically unpredictable. The focal adhesion kinase (FAK) and the proline-rich tyrosine kinase (Pyk2) show a high expression in glioma cell lines and have an influence on increased cell
Peroxynitrite modulates tyrosine phosphorylation and phosphoinositide signalling in human neuroblastoma SH-SY5Y cells: attenuated effects in human 1321N1 astrocytoma cells.
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Peroxynitrite may contribute to oxidative stress involving neurodegeneration in several disorders, including Alzheimer's disease. As with other reactive oxygen species, peroxynitrite might affect neuronal signalling systems, actions that could contribute to adaptive or deleterious cellular outcomes,
Cytokine-induced transcription of protein-tyrosine-phosphatases in human astrocytoma cells.
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Interleukin-1 (IL-1) and Tumor Necrosis Factor-a (TNFalpha) are potent mediators of inflammatory reactions in the brain. Although much is known about the effects of IL-1 on expression of secretory proteins, few studies have addressed the question of a selective, IL-1-dependent expression of genes
Detection of tumour progression in the follow-up of irradiated low-grade astrocytomas: comparison of 3-[123I]iodo-alpha-methyl- L-tyrosine and 99mTc-MIBI SPET.
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Conventional MRI often fails to distinguish between progressive tumour and radiation injury, because both appear as mass lesions with unspecific Gd-DTPA enhancement. Furthermore, the sensitivity of FDG PET for the evaluation of malignant lesions in the brain is limited owing to high cortical uptake.
Tyrosine receptor kinase B is a drug target in astrocytomas.
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Astrocytomas are the most common primary human brain tumors. Receptor tyrosine kinases (RTKs), including tyrosine receptor kinase B (TrkB, also known as tropomyosin-related kinase B; encoded by neurotrophic tyrosine kinase receptor type 2 [NTRK2]), are frequently mutated by rearrangement/fusion in
Inhibition of Mer and Axl receptor tyrosine kinases in astrocytoma cells leads to increased apoptosis and improved chemosensitivity.
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Astrocytomas account for the majority of malignant brain tumors diagnosed in both adult and pediatric patients. The therapies available to treat these neoplasms are limited, and the prognosis associated with high-grade lesions is extremely poor. Mer (MerTK) and Axl receptor tyrosine kinases (RTK)
Tyrosine kinase activity is essential for interleukin-1 beta--stimulated production of interleukin-6 in U373 human astrocytoma cells.
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We have investigated the roles of tyrosine kinase and protein kinase C activity in interleukin-1 beta-induced interleukin-6 production, using the U373 human astrocytoma cell line as a model system for astrocytes. Compounds known to inhibit tyrosine kinases were tested for effects on interleukin-6
Expression and function of the receptor protein tyrosine phosphatase zeta and its ligand pleiotrophin in human astrocytomas.
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Using subtractive cloning combined with cDNA array analysis, we previously identified the genes encoding for the protein tyrosine phosphatase zeta/receptor-type protein tyrosine phosphatase beta (PTPzeta/RPTPbeta) and its ligand pleiotrophin (PTN) as overexpressed in human glioblastomas compared to
Growth-factor-driven rescue to receptor tyrosine kinase (RTK) inhibitors through Akt and Erk phosphorylation in pediatric low grade astrocytoma and ependymoma.
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Up to now, several clinical studies have been started investigating the relevance of receptor tyrosine kinase (RTK) inhibitors upon progression free survival in various pediatric brain tumors. However, single targeted kinase inhibition failed, possibly due to tumor resistance mechanisms. The present
Prediction of survival in patients with IDH-wildtype astrocytic gliomas using dynamic O-(2-[18F]-fluoroethyl)-L-tyrosine PET.
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PURPOSE
Integrated histomolecular diagnostics of gliomas according to the World Health Organization (WHO) classification of 2016 has refined diagnostic accuracy and prediction of prognosis. This study aimed at exploring the prognostic value of dynamicTransmural compression-induced proliferation and DNA synthesis through activation of a tyrosine kinase pathway in rat astrocytoma RCR-1 cells.
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Gliosis results from abnormal proliferation of glial cells and often occurs in response to brain or spinal cord injury. There are many factors that trigger gliosis associated with such injuries, including ischemia, humoral factors produced by the injured tissue, and possibly mechanical compression
FGFR1 tyrosine kinase domain duplication in pilocytic astrocytoma with anaplasia.
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We report the case of a 27-yr-old male with visual field loss who had a 4.9-cm complex cystic mass in the right occipital lobe. Histologic examination showed pilocytic astrocytoma (PA) with anaplasia, and molecular characterization revealed FGFR1 duplication with additional variants of unknown
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