Yoshikazu Miura

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Miura, Yoshikazu, and Hisao Matsui. Glucagon-like peptide-1 induces a cAMP-dependent increase of [Na ]i associated with insulin secretion in pancreatic islet -cells. Am J Physiol Endocrinol Metab 285: E1001–E1009, 2003; 10.1152/ajpendo.00005.2003.—Glucagon-like peptide-1 (GLP-1) elevates the intracellular free calcium concentration ([Ca2 ]i) and insulin(More)
AIM To investigate the proliferative effect of advanced glycation end-products (AGEs) and the role of their cellular receptor (RAGE) on hepatocellular carcinoma (HCC) cells, and the inhibitory effects of MK615, an extract from Japanese apricot, against AGEs were also evaluated. METHODS Two HCC cell lines, HuH7 and HepG2, were used. Expression of RAGE was(More)
Glucagon-like peptide-1 (GLP-1) elevates the intracellular free calcium concentration ([Ca2+]i) and insulin secretion in a Na+-dependent manner. To investigate a possible role of Na ion in the action of GLP-1 on pancreatic islet cells, we measured the glucose-and GLP-1-induced intracellular Na+ concentration ([Na+]i), [Ca2+]i, and insulin secretion in(More)
We examined the time course of effects of a high-fat/low-carbohydrate (HF/LC) diet on the impairment of glucose tolerance in rats, clarified whether insulin secretion and sensitivity were impaired by the HF/LC diet, and investigated the relationship between the increased nonesterified fatty acids (NEFA) after HF/LC diet feeding and insulin secretion and(More)
The influence of in vivo administration of detergents on the hepatic microsomal cytochrome P-450 system was studied in rat. Male Wistar rats were administered detergents, Emulgen 913 (50 mg or 100 mg kg-1 of body weight (B.W.], or sodium dodecylsulfate (SDS, 25 mg or 50 mg kg-1 of B.W.) intraperitoneally once a day for 3 days. Cytochrome P-450 content in(More)
BACKGROUND Advanced glycation end products (AGEs) are derivative compounds generated from non-enzymatic glycosylation and oxidation. In comparison with glucose-derived AGEs (Glu-AGEs), glyceraldehyde-derived AGEs (Glycer-AGEs) have stronger toxicity to living systems. In this study, we compared the effects of Glu-AGE and Glycer-AGE on insulin secretion. (More)
Background: Glycated albumin (GA) is an Amadori product used as a marker of hyperglycemia. In this study, we investigated the effect of GA on insulin secretion from pancreatic b cells. Methods: Islets were collected from male Wistar rats by collagenase digestion. Insulin secretion in the presence of non-glycated human albumin (HA) and GA was measured under(More)
Oral administration of triphenyltin chloride (TPT) (60 mg/kg body weight) inhibits the insulin secretion by decreasing the cytoplasmic Ca2+ concentration ([Ca2+]i) induced by glucose-dependent insulinotropic polypeptide (GIP) in pancreatic beta-cells of the hamster. To test the possibility that the abnormal level of [Ca2+]i induced by TPT administration(More)
Oral administration of triphenyltin chloride (TPT) (6 mg/100g body weight) inhibits insulin secretion by decreasing glucose-induced cytoplasmic Ca(2+) concentration ([Ca(2+)](i)) in pancreatic β-cells of the hamster. To test the possibility that the abnormal level of the [Ca(2+)](i) induced by TPT administration could be due to a defect in the metabolic(More)