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glucagonoma/tyrosine
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13 risultati
Glucagon release is regulated by tyrosine phosphatase and PI3-kinase activity.
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Since inhibition of protein tyrosine phosphatase (PTPase) activity by peroxovanadate (pV) affects insulin release and phosphorylation of pancreatic islet proteins in the insulin signaling pathway, we studied whether pV also modulates glucagon release. At 3.3mM glucose, pV (0.1-1mM) enhanced glucagon
Profile and differential expression of protein tyrosine phosphatases in mouse pancreatic islet tumor cell lines.
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Protein tyrosine phosphatases (PTPs) play important roles in cell growth and differentiation of normal and tumor cells. In this study, we analyzed the PTP profile in two pancreatic islet tumor cell lines. Transcripts were isolated from alphaTC-1 (glucagon-secreting) and betaTC-1 (insulin-secreting)
Protein metabolism in glucagonoma.
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Although protein wasting and reduced amino acid concentrations are common findings in glucagonoma patients, the mechanisms underlying these alterations are unclear. Therefore, we studied basal postabsorptive leucine, phenylalanine and tyrosine turnover following L-[D3]-Leucine, L-[D5]-Phenylalanine
Increased amino acid clearance and urea synthesis in a patient with glucagonoma.
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Fasting concentrations, clearance of exogenous infused amino acids, and lean body mass were studied in a patient with glucagonoma syndrome (fasting glucagon = 380 pmol/l, normal range 15-45 pmol). The fasting concentrations of all amino acids were reduced. The clearances of alanine, arginine,
Identification of a second transmembrane protein tyrosine phosphatase, IA-2beta, as an autoantigen in insulin-dependent diabetes mellitus: precursor of the 37-kDa tryptic fragment.
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A novel cDNA, IA-2beta, was isolated from a mouse neonatal brain library. The predicted protein sequence revealed an extracellular domain, a transmembrane region, and an intracellular domain. The intracellular domain is 376 amino acids long and 74% identical to the intracellular domain of IA-2, a
Immunohistochemical localization of betacellulin, a new member of the EGF family, in normal human pancreas and islet tumor cells.
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Betacellulin (BTC) purified from mouse beta cell tumor (betaTC-3) is a new member of the epidermal growth factor (EGF) family which can bind receptor tyrosine kinase, EGF receptor (erbB1) and erbB4. It has been demonstrated that proBTC mRNA was abundantly expressed in human pancreas tissue, and that
The Magnesium Transporter NIPAL1 Is a Pancreatic Islet-Expressed Protein That Conditionally Impacts Insulin Secretion
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Type 2 diabetes (T2D) is a chronic metabolic disease characterized by pancreatic β-cell dysfunction and peripheral insulin resistance. Among individuals with T2D, approximately 30% exhibit hypomagnesemia. Hypomagnesemia has been linked to insulin resistance through reduced tyrosine kinase activity
Autoantigens in insulin-dependent diabetes mellitus: molecular cloning and characterization of human IA-2 beta.
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In this study, we describe the isolation, expression, and characterization of a new member of the transmembrane protein tyrosine phosphatase family from human brain, designated IA-2 beta. The 3853-bp cDNA encodes 986 amino acids with a molecular mass of 108,044 daltons (a predicted pI value of 5.8).
Ras antagonizes cAMP stimulated glucagon gene transcription in pancreatic islet cell lines.
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Ras, a GTP-binding protein, converts membrane tyrosine kinase signalling to changes in gene expression patterns. Utilising a rat glucagon promoter-CAT construct (p[-1.1]GLU-CAT) we demonstrate in transient transfection experiments that the oncogenic Ras inhibits cAMP-dependent activation of
Amino acids and lipoproteins in plasma of duodenopancreatectomized patients: effects of glucagon in physiological amounts.
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Duodenopancreatectomy induces a severe glucagon deficiency and elevated plasma concentrations of alanine, aspartate, glycine, proline, serine, arginine, citrulline, ornithine, phenylalanine and tyrosine. Restoring high physiological plasma glucagon in six such patients by infusing 0.3 mg/24 h of
Effects of pharmacologic hyperglucagonemia on plasma amino acid concentrations in normal and diabetic man.
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Four normal and five insulin dependent diabetic men received a 2 h pharmacologic glucagon infusion (50 ng/kg/min) resulting in plasma glucagon levels (4400 pg/ml) similar to those seen in glucagonoma patients. In normal subjects in whom plasma insulin concentrations rose significantly (239 uU/ml)
Pancreatic endocrine tumors.
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Pancreatic endocrine tumors have been steadily growing in incidence and prevalence during the last two decades, showing an incidence of 4-5/1,000,000 population. They represent a heterogeneous group with very varying tumor biology and prognosis. About half of the patients present clinical symptoms
Splicing factor hnRNPH drives an oncogenic splicing switch in gliomas.
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In tumours, aberrant splicing generates variants that contribute to multiple aspects of tumour establishment, progression and maintenance. We show that in glioblastoma multiforme (GBM) specimens, death-domain adaptor protein Insuloma-Glucagonoma protein 20 (IG20) is consistently aberrantly spliced
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