Abstract：
:A hypothesis that accounts for most of the available literature on insulin-stimulated GLUT4 translocation is that insulin action controls the access of GLUT4 vesicles to a constitutively active plasma-membrane fusion process. However, using an in vitro fusion assay, we show here that fusion is not constitutively active. Instead, the rate of fusion activity is stimulated 8-fold by insulin. Both the magnitude and time course of stimulated in vitro fusion recapitulate the cellular insulin response. Fusion is cell cytoplasm and SNARE dependent but does not require cell cytoskeleton. Furthermore, insulin activation of the plasma-membrane fraction of the fusion reaction is the essential step in regulation. Akt from the cytoplasm fraction is required for fusion. However, the participation of Akt in the stimulation of in vitro fusion is dependent on its in vitro recruitment onto the insulin-activated plasma membrane.
journal_name
Cell Metabjournal_title
Cell metabolismauthors
Koumanov F,Jin B,Yang J,Holman GDdoi
10.1016/j.cmet.2005.08.007keywords:
subject
Has Abstractpub_date
2005-09-01 00:00:00pages
179-89issue
3eissn
1550-4131issn
1932-7420pii
S1550-4131(05)00235-4journal_volume
2pub_type
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