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  • 1
    ISSN: 1432-0428
    Keywords: C-peptide ; insulin secretion ; effect of insulin ; alloxan-diabetic rats ; C-peptide effect in vivo ; somatostatin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of synthetic rat C-peptide 1 and C-peptide 2 on plasma insulin and blood glucose concentrations in the rat were studied. Infusion of rat C-peptide (500μg·h-1· kg-1) diminished glucose induced increase of plasma insulin by 56% (15.2±0.9 versus 6.6± 0.6 ng/ml, p〈0.01, mean±SEM). Somatostatin infused at a rate of 50 μg·h-1·kg-1 body weight inhibited glucose-induced insulin secretion by 33%. In the presence of a mixture of both C-peptides or somatostatin, blood glucose after intravenous glucose was higher than in the control experiments. In alloxan-diabetic rats, C-peptide (160 μg/kg) significantly increased and prolonged the hypoglycaemic effect of exogenous insulin. It is suggested that C-peptide may not be a biologically inert substance.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Somatostatin ; Insulin ; C-peptide ; Diabetes ; Pituitary function ; Gastric acid secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of somatostatinoma syndrome in a 30-year-old woman is presented. Basal levels of growth hormone and of pancreatic and gastric hormones were reduced and the response of growth hormone, insulin and C-peptide to stimuli such as arginine, glucose, glibenclamide and calcium was virtually abolished. Similarly, gastric acid secretion, pancreatic exocrine function and intestinal absorption were significantly reduced. On the other hand, basal and stimulated levels of adrenocorticotropic hormone (ACTH), luteinizing hormone (LH), follicle-stimulating hormone (FSH) and thyroid-stimulating hormone (TSH) were within the normal range. Plasma somatostatin-like immunoreactivity was increased to 600 2,000 pg/ml (normal: 88–140 pg/ml). Immunocytochemical studies demonstrated the presence of somatostatin immunoreactive material in the primary tumour in the head of the pancreas and in the liver metastases. In spite of two courses of chemotherapy with streptozotocin and 5-fluorouracil the patient died due to liver failure 5 months after the first admission to hospital.
    Type of Medium: Electronic Resource
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