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glucagonoma/arginina
Il collegamento viene salvato negli appunti
Pagina 1 a partire dal 19 risultati
A familial glucagonoma syndrome: genetic, clinical and biochemical features.
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A family with multiple endocrine neoplasia type I (MEN-I) is described in which three members had A-cell pancreatic tumors. Two of these members had classic glucagonoma syndromes. The proband, a 62 year old woman, had a high (less than or equal to 9.2 ng/ml) basal plasma glucagon level, most of
Effects of arginine vasopressin and oxytocin on glucagon release from clonal alpha-cell line In-R1-G9: involvement of V1b receptors.
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Receptor antagonists were used to determine which receptor mediates the effect of arginine vasopressin (AVP) and oxytocin (OT) on glucagon release from hamster glucagonoma In-R1-G9 cells. Both AVP (10(-9)-10(-6) M) and OT (10(-8)-10(-5) M) increased glucagon release from In-R1-G9 cells in a
Somatostatin analogue in treatment of coexisting glucagonoma and pancreatic pseudocyst: dissociation of responses.
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After an acute episode of pancreatitis, a 63-year-old man was found to have a pancreatic glucagonoma. The tumor was resected without evidence of metastases. Three years later he had symptoms of uncontrolled diabetes, no skin lesions, and diarrhea and was found to have a pancreatic pseudocyst and
Secretory response and immunochemical heterogeneity of glucagon in plasma and tumor extracts of a patient with glucagonoma.
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The secretory response and immunoreactive heterogeneity of glucagon was investigated in a patient with glucagonoma syndrome. After glucose administration, abnormal insulin release accompanied by glucose intolerance were observed, whereas the high glucagon circulating levels were only partially
Functional studies in patients with the glucagonoma syndrome.
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Four patients with glucagon-producing tumours of the pancreas were investigated. Fasting plasma glucagon concentrations ranged from 209--625 pmol/l. Plasma insulin concentrations were normal except in one patient, where the tumour also produced insulin (558 pmol/l). Intravenous glucose (25 g/m2)
Metabolic studies and glucagon gel filtration pattern before and after surgery in a case of glucagonoma syndrome.
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A case of glucagonoma syndrome with necrolytic migratory erythema, glossitis, anemia, hyperglucagonemia and a malignant, pancreatic A-cell tumour in a 68-year-old male is described. Gel filtration of the highly elevated circulating glucagon immunoreactivity (2200 pg/ml) demonstrated 60% pancreatic
A functional study of a case of glucagonoma exhibiting typical glucagonoma syndrome.
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A 46-year-old man had a 7-year history of severe rash, which was then diagnosed as necrolytic migratory erythema. He had a weight loss of 6 kg, abnormal glucose tolerance test findings, anemia, glossitis, hair loss, and hypoproteinemia. Plasma amino acids levels were significantly decreased, and the
Cystic glucagonoma with loss of heterozygosity on chromosome 11 in multiple endocrine neoplasia type 1.
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A 52-year-old man with a past history of a pituitary adenoma and hyperparathyroidism due to a parathyroid adenoma was admitted because of a solitary tumour of the pancreas revealed by ultrasonography. His family history was unremarkable. Plasma glucagon levels were slightly elevated (280 ng/l,
The glucagonoma syndrome: stimulus-induced plasma responses of circulating glucagon components IRG9000 and IRG3500.
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Plasma responses of the major immunoreactive glucagon (IRG) components have been investigated in a case of glucagonoma syndrome. Fasting plasma IRG was 4155 pg/ml. Gel chromatography of plasma revealed that 66% of immunoreactivity was present as IRG9000, while IRG3500 accounted for an additional
Glucagonoma syndrome.
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A 53-year-old Japanese man with a skin eruption characteristic of glucagonoma syndrome had had misdiagnoses for 10 years. The plasma glucagon level was not abnormally high on the first admission, and 4 years later the level was elevated as determined by the 30 gm arginine tolerance test. An alpha
A Novel Missense Mutation of the MEN1 Gene in a Patient with Multiple Endocrine Neoplasia Type 1 with Glucagonoma and Obesity.
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A 35-year-old obese diabetic man presented with recurrent primary hyperparathyroidism during a three-year outpatient follow-up. He was clinically diagnosed with multiple endocrine neoplasia type 1 (MEN1) due to the presence of a pituitary adenoma and multiple glucagonomas. The glucagonomas may have
Functional characterization of somatostatin receptors expressed on hamster glucagonoma cells.
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We characterized somatostatin receptors expressed in hamster glucagonoma INR1G9 cells and the effects of somatostatin on glucagon secretion, proglucagon gene expression, and the adenosine 3',5'-cyclic monophosphate (cAMP)-dependent signal-transduction cascade. 125I-labeled somatostatin was displaced
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,
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
Beta-cell maturation leads to in vitro sensitivity to cytotoxins.
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Pancreatic beta-cells are more sensitive to several toxins (e.g., streptozotocin, alloxan, cytokines) than the other three endocrine cell types in the islets of Langerhans. Cytokine-induced free radicals in beta-cells may be involved in beta-cell-specific destruction in type 1 diabetes. To
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