RGD Reference Report - Insulin increases the association of Akt-2 with Glut4-containing vesicles. - Rat Genome Database

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Insulin increases the association of Akt-2 with Glut4-containing vesicles.

Authors: Calera, MR  Martinez, C  Liu, H  Jack, AK  Birnbaum, MJ  Pilch, PF 
Citation: Calera MR, etal., J Biol Chem. 1998 Mar 27;273(13):7201-4.
RGD ID: 2306429
Pubmed: PMID:9516411   (View Abstract at PubMed)

Expression of a constitutively active, membrane-associated Akt-1 (PKB alpha) construct in 3T3L1 adipocytes was shown to induce glucose uptake in the absence of insulin by stimulating Glut4 translocation to the plasma membrane (Kohn, A. D., Summers, S. A., Birnbaum, M. J., and Roth, R. A. (1996) J. Biol. Chem. 271, 31372-31378). However, in rat fat cell the vast majority of Akt-1 is cytosolic and shows no re-distribution to the plasma membrane in response to insulin. On the other hand, little work has been done with other Akt family members such as Akt-2 (PKB beta) or Akt-3 (PKB gamma). In this report, an analysis of the subcellular distribution of Akt-2 in rat adipocytes shows that Akt-2 is present in significant amounts in various membrane compartments, as well as in the cytosol, and the former include the light microsomes where Glut4 is present in the basal state. The distribution of Akt-2 in resting adipocytes was found to substantially overlap with that of Glut4 when light microsomes were subfractionated by a sucrose velocity gradient indicating possible co-localization. We confirmed co-localization of Akt-2 and Glut4 in the basal state by immunopurification of Glut4 vesicles, which exhibited a 5.5-fold increase in Akt-2 in response to insulin relative to the amount of Glut4. These results are consistent with the possibility that Akt-2 may be involved in Glut4 vesicle translocation.

Gene Ontology Annotations    Click to see Annotation Detail View

Cellular Component
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
insulin-responsive compartment  IDA 2306429; 2306429 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Akt2  (AKT serine/threonine kinase 2)
Slc2a4  (solute carrier family 2 member 4)

Objects referenced in this article
Gene Akt1 AKT serine/threonine kinase 1 Rattus norvegicus

Additional Information