title: Promiscuous affairs of PKB/AKT isoforms in metabolism.
abstract: The protein kinase B (PKB) family encompasses three isoforms; PKBα (AKT1), PKBβ (AKT2) and PKBγ (AKT3). PKBα and PKBβ but not PKBγ, are prominently expressed in classical insulin-sensitive tissues like liver, muscle and fat. Transgenic mice deficient for PKBα, PKBβ or PKBγ have been analysed to study the roles of PKB isoforms in metabolic regulation. Until recently, only loss of PKBβ was reported to result in metabolic disorders, especially insulin resistance, in humans and mice. However, a new study has shown that PKBα-deficient mice can show enhanced glucose tolerance accompanied by improved β-cell function and higher insulin sensitivity in adipocytes. These findings prompted us to review the relevant literature on the regulation of glucose metabolism by PKB isoforms in liver, skeletal muscle, adipocytes and pancreas.
authors.affiliation: Endocrinology, Diabetology & Clinical Nutrition, University Hospital of Zurich, Switzerland.
authors.forename: Simon M
authors.initials: SM
authors.lastname: Schultze
authors.forename: Jørgen
authors.initials: J
authors.lastname: Jensen
authors.forename: Brian A
authors.initials: BA
authors.lastname: Hemmings
authors.forename: Oliver
authors.initials: O
authors.lastname: Tschopp
authors.forename: Markus
authors.initials: M
authors.lastname: Niessen
mesh_terms: D017667:Adipocytes / Q000378:metabolism; D000818:Animals; D004734:Energy Metabolism / Q000502:physiology; D015870:Gene Expression / Q000502:physiology; D005947:Glucose / Q000378:metabolism*; D006801:Humans; D007328:Insulin / Q000378:metabolism*; D007333:Insulin Resistance; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D008099:Liver / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D018482:Muscle, Skeletal / Q000378:metabolism; D009928:Organ Specificity; D010179:Pancreas / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D011972:Receptor, Insulin / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D007328:Insulin; D007527:Isoenzymes; D011972:Receptor, Insulin; D051057:Proto-Oncogene Proteins c-akt; D005947:Glucose