title: Insulin releasing action of 2-[2-(4,5-dihydro-1H-imadazol-2-yl)-1-phenylethyl] pyridine dihydrochloride sesquihydrate (DG-5128), a new, orally effective hypoglycaemic agent.
abstract: 2-[2-(4,5-dihydro-1H-imidazol-2-yl)-1-phenylethyl] pyridine dihydrochloride sesquilhydrate (DG-5128) is a new orally effective hypoglycaemic agent structurally unrelated to the known hypoglycaemics. DG-5128 was found to decrease blood glucose levels by stimulating insulin release, like the sulphonylurea hypoglycaemics. However, the study with the rat Langerhans islets in vitro indicated a great difference in mode of stimulation of insulin release between DG-5128 and a sulphonylurea hypoglycaemic, tolbutamide. DG-5128 significantly reversed alpha-adrenergic inhibition of the glucose-primed insulin release from the islets, while tolbutamide did not. From the comparison with the effects of phentolamine, yohimbine and prazosine, DG-5128 was strongly suggested to stimulate the glucose-primed insulin release through antagonizing at alpha 2-adrenoreceptors on the B cells.
mesh_terms: D000284:Administration, Oral; D000319:Adrenergic beta-Antagonists / Q000494:pharmacology; D000818:Animals; D001786:Blood Glucose / Q000032:analysis; D003000:Clonidine / Q000494:pharmacology; D007004:Hypoglycemic Agents / Q000494:pharmacology*; D007093:Imidazoles / Q000494:pharmacology*; D007328:Insulin / Q000097:blood / Q000378:metabolism*; D000078790:Insulin Secretion; D007515:Islets of Langerhans / Q000378:metabolism; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D014044:Tolbutamide / Q000494:pharmacology
chemical_list: D000319:Adrenergic beta-Antagonists; D001786:Blood Glucose; D007004:Hypoglycemic Agents; D007093:Imidazoles; D007328:Insulin; C032368:midaglizole; D014044:Tolbutamide; D003000:Clonidine