title: Research and development of glucokinase activators for diabetes therapy: theoretical and practical aspects.
abstract: Glucokinase Glucokinase (GK GK ; EC 2.7.1.1.) phosphorylates and regulates glucose metabolism in insulin-producing pancreatic beta-cells, hepatocytes, and certain cells of the endocrine and nervous systems allowing it to play a central role in glucose homeostasis glucose homeostasis . Most importantly, it serves as glucose sensor glucose sensor in pancreatic beta-cells mediating glucose-stimulated insulin biosynthesis and release and it governs the capacity of the liver to convert glucose to glycogen. Activating and inactivating mutations of the glucokinase gene cause autosomal dominant hyperinsulinemic hypoglycemia and hypoinsulinemic hyperglycemia in humans, respectively, illustrating the preeminent role of glucokinase in the regulation of blood glucose and also identifying the enzyme as a potential target for developing antidiabetic drugs antidiabetic drugs . Small molecules called glucokinase activators (GKAs) glucokinase activators (GKAs) which bind to an allosteric activator allosteric activator site of the enzyme have indeed been discovered and hold great promise as new antidiabetic agents. GKAs increase the enzyme's affinity for glucose and also its maximal catalytic rate. Consequently, they stimulate insulin biosynthesis and secretion, enhance hepatic glucose uptake, and augment glucose metabolism and related processes in other glucokinase-expressing cells. Manifestations of these effects, most prominently a lowering of blood glucose, are observed in normal laboratory animals and man but also in animal models of diabetes and patients with type 2 diabetes mellitus (T2DM T2DM ) type 2 diabetes mellitus (T2DM) . These compelling concepts and results sustain a strong R&D effort by many pharmaceutical companies to generate GKAs with characteristics allowing for a novel drug treatment of T2DM.
authors.affiliation: Department of Biochemistry and Biophysics, University of Pennsylvania, Institute for Diabetes, Obesity and Metabolism, 415 Curie Blvd, 605 CRB, Philadelphia, PA 19104, USA. matsch@mail.med.upenn.edu
authors.forename: Franz M
authors.initials: FM
authors.lastname: Matschinsky
authors.forename: Bogumil
authors.initials: B
authors.lastname: Zelent
authors.forename: Nicolai M
authors.initials: NM
authors.lastname: Doliba
authors.forename: Klaus H
authors.initials: KH
authors.lastname: Kaestner
authors.forename: Jane M
authors.initials: JM
authors.lastname: Vanderkooi
authors.forename: Joseph
authors.initials: J
authors.lastname: Grimsby
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Berthel
authors.forename: Ramakanth
authors.initials: R
authors.lastname: Sarabu
mesh_terms: D000818:Animals; D003920:Diabetes Mellitus / Q000188:drug therapy*; D003924:Diabetes Mellitus, Type 2 / Q000188:drug therapy; D020536:Enzyme Activators / Q000494:pharmacology* / Q000627:therapeutic use; D005941:Glucokinase / Q000378:metabolism*; D006706:Homeostasis / Q000187:drug effects; D006801:Humans; D006946:Hyperinsulinism / Q000188:drug therapy; D007004:Hypoglycemic Agents / Q000494:pharmacology / Q000627:therapeutic use*; D011955:Receptors, Drug / Q000187:drug effects
chemical_list: D020536:Enzyme Activators; D007004:Hypoglycemic Agents; D011955:Receptors, Drug; D005941:Glucokinase