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Roles of PI 3-kinase and Ras on insulin-stimulated glucose transport in 3T3-L1 adipocytes. 1997

H Katagiri, and T Asano, and K Inukai, and T Ogihara, and H Ishihara, and Y Shibasaki, and T Murata, and J Terasaki, and M Kikuchi, and Y Yazaki, and Y Oka
Third Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Hongo, Japan.

The dominant negative p85alpha regulatory subunit (delta p85alpha) of phosphatidylinositol (PI) 3-kinase or dominant negative Ras (N17Ras) was overexpressed in 3T3-L1 adipocytes using an adenovirus-mediated gene transduction system. Functional expression of delta p85alpha and N17Ras was confirmed by marked inhibition of insulin-stimulated PI 3-kinase activity and mitogen-activated protein kinase activity, respectively. N17Ras expression did not affect glucose transport activity, whereas delta p85alpha expression inhibited insulin-stimulated glucose transport with impairment of GLUT-4 translocation, although inhibition of glucose transport activity was less remarkable than that of PI 3-kinase activity in delta p85alpha-expressing cells. Thus the Ras signaling pathway does not play a major part in either translocation or intrinsic activity of glucose transporters, but PI 3-kinase activation, via phosphotyrosyl proteins and heterodimeric PI 3-kinase, plays a pivotal role in insulin-stimulated glucose transport. However, a discrepancy was observed between PI 3-kinase activity and glucose transport activity, suggesting a possibility that a different pathway(s) is involved in insulin-stimulated intrinsic activity of glucose transporters.

UI MeSH Term Description Entries
D007328 Insulin A 51-amino acid pancreatic hormone that plays a major role in the regulation of glucose metabolism, directly by suppressing endogenous glucose production (GLYCOGENOLYSIS; GLUCONEOGENESIS) and indirectly by suppressing GLUCAGON secretion and LIPOLYSIS. Native insulin is a globular protein comprised of a zinc-coordinated hexamer. Each insulin monomer containing two chains, A (21 residues) and B (30 residues), linked by two disulfide bonds. Insulin is used as a drug to control insulin-dependent diabetes mellitus (DIABETES MELLITUS, TYPE 1). Iletin,Insulin A Chain,Insulin B Chain,Insulin, Regular,Novolin,Sodium Insulin,Soluble Insulin,Chain, Insulin B,Insulin, Sodium,Insulin, Soluble,Regular Insulin
D009004 Monosaccharide Transport Proteins A large group of membrane transport proteins that shuttle MONOSACCHARIDES across CELL MEMBRANES. Hexose Transport Proteins,Band 4.5 Preactin,Erythrocyte Band 4.5 Protein,Glucose Transport-Inducing Protein,Hexose Transporter,4.5 Preactin, Band,Glucose Transport Inducing Protein,Preactin, Band 4.5,Proteins, Monosaccharide Transport,Transport Proteins, Hexose,Transport Proteins, Monosaccharide,Transport-Inducing Protein, Glucose
D003847 Deoxyglucose 2-Deoxy-D-arabino-hexose. An antimetabolite of glucose with antiviral activity. 2-Deoxy-D-glucose,2-Deoxyglucose,2-Desoxy-D-glucose,2 Deoxy D glucose,2 Deoxyglucose,2 Desoxy D glucose
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D016475 3T3 Cells Cell lines whose original growing procedure consisted being transferred (T) every 3 days and plated at 300,000 cells per plate (J Cell Biol 17:299-313, 1963). Lines have been developed using several different strains of mice. Tissues are usually fibroblasts derived from mouse embryos but other types and sources have been developed as well. The 3T3 lines are valuable in vitro host systems for oncogenic virus transformation studies, since 3T3 cells possess a high sensitivity to CONTACT INHIBITION. 3T3 Cell,Cell, 3T3,Cells, 3T3
D017667 Adipocytes Cells in the body that store FATS, usually in the form of TRIGLYCERIDES. WHITE ADIPOCYTES are the predominant type and found mostly in the abdominal cavity and subcutaneous tissue. BROWN ADIPOCYTES are thermogenic cells that can be found in newborns of some species and hibernating mammals. Fat Cells,Lipocytes,Adipocyte,Cell, Fat,Cells, Fat,Fat Cell,Lipocyte
D051379 Mice The common name for the genus Mus. Mice, House,Mus,Mus musculus,Mice, Laboratory,Mouse,Mouse, House,Mouse, Laboratory,Mouse, Swiss,Mus domesticus,Mus musculus domesticus,Swiss Mice,House Mice,House Mouse,Laboratory Mice,Laboratory Mouse,Mice, Swiss,Swiss Mouse,domesticus, Mus musculus
D017853 Phosphotransferases (Alcohol Group Acceptor) A group of enzymes that transfers a phosphate group onto an alcohol group acceptor. EC 2.7.1.
D017871 Calcium-Calmodulin-Dependent Protein Kinases A CALMODULIN-dependent enzyme that catalyzes the phosphorylation of proteins. This enzyme is also sometimes dependent on CALCIUM. A wide range of proteins can act as acceptor, including VIMENTIN; SYNAPSINS; GLYCOGEN SYNTHASE; MYOSIN LIGHT CHAINS; and the MICROTUBULE-ASSOCIATED PROTEINS. (From Enzyme Nomenclature, 1992, p277) Ca(2+)-Calmodulin-Dependent Protein Kinase,Calcium-Calmodulin-Dependent Protein Kinase,Calmodulin-Dependent Protein Kinase,Calmodulin-Dependent Protein Kinases,Multifunctional Calcium-Calmodulin-Dependent Protein Kinase,Restricted Calcium-Calmodulin-Dependent Protein Kinase,Calcium-Calmodulin-Dependent Protein Kinases, Multifunctional,Calcium-Calmodulin-Dependent Protein Kinases, Restricted,Calmodulin-Dependent Multiprotein Kinase,Calmodulin-Kinase,Cam-MPK,Multifunctional Calcium-Calmodulin-Dependent Protein Kinases,Restricted Calcium-Calmodulin-Dependent Protein Kinases,Calcium Calmodulin Dependent Protein Kinase,Calcium Calmodulin Dependent Protein Kinases, Multifunctional,Calcium Calmodulin Dependent Protein Kinases, Restricted,Calmodulin Dependent Multiprotein Kinase,Calmodulin Dependent Protein Kinase,Calmodulin Dependent Protein Kinases,Calmodulin Kinase,Cam MPK,Kinase, Calcium-Calmodulin-Dependent Protein,Kinase, Calmodulin-Dependent Protein,Multifunctional Calcium Calmodulin Dependent Protein Kinase,Multifunctional Calcium Calmodulin Dependent Protein Kinases,Multiprotein Kinase, Calmodulin-Dependent,Protein Kinase, Calcium-Calmodulin-Dependent,Protein Kinase, Calmodulin-Dependent,Protein Kinases, Calcium-Calmodulin-Dependent,Protein Kinases, Calmodulin-Dependent,Restricted Calcium Calmodulin Dependent Protein Kinase,Restricted Calcium Calmodulin Dependent Protein Kinases
D018631 ras Proteins Small, monomeric GTP-binding proteins encoded by ras genes (GENES, RAS). The protooncogene-derived protein, PROTO-ONCOGENE PROTEIN P21(RAS), plays a role in normal cellular growth, differentiation and development. The oncogene-derived protein ONCOGENE PROTEIN P21(RAS) can play a role in aberrant cellular regulation during neoplastic cell transformation (CELL TRANSFORMATION, NEOPLASTIC). This enzyme was formerly listed as EC 3.6.1.47. Gene Products, ras,ras GTPase,ras Protein,ras GTPases,GTPase, ras,GTPases, ras,Protein, ras,ras Gene Products

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