title: Abnormal glucose metabolism accompanies failure of glucose to stimulate insulin release from a rat pancreatic cell line (RINm5F).
abstract: Glucose metabolism and insulin release were studied in isolated rat islets and in an insulin-producing rat cell-line (RINm5F). Intact islets displayed two components of glucose utilization, with glucose stimulation of insulin release being associated with the high-Km component (reflecting glucokinase-like activity). Glucose failed to stimulate insulin release from RINm5F cells, which only displayed a single low-Km component of glucose utilization. Only low-Km (hexokinase-like) glucose-phosphorylating activity was found for disrupted RINm5F cells. These changes in glucose metabolism may contribute towards the failure of glucose to stimulate insulin release from RINm5F cells.
mesh_terms: D000818:Animals; D002460:Cell Line; D005947:Glucose / Q000378:metabolism* / Q000494:pharmacology; D007328:Insulin / Q000276:immunology / Q000378:metabolism*; D007515:Islets of Langerhans / Q000187:drug effects / Q000378:metabolism; D008297:Male; D010179:Pancreas / Q000187:drug effects / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D013010:Sonication; D013268:Stimulation, Chemical
chemical_list: D007328:Insulin; D005947:Glucose