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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2015 ; 290
(39
): 23528-42
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Proteomic Analysis of GLUT4 Storage Vesicles Reveals Tumor Suppressor Candidate 5
(TUSC5) as a Novel Regulator of Insulin Action in Adipocytes
#MMPMID26240143
Fazakerley DJ
; Naghiloo S
; Chaudhuri R
; Koumanov F
; Burchfield JG
; Thomas KC
; Krycer JR
; Prior MJ
; Parker BL
; Murrow BA
; Stöckli J
; Meoli CC
; Holman GD
; James DE
J Biol Chem
2015[Sep]; 290
(39
): 23528-42
PMID26240143
show ga
Insulin signaling augments glucose transport by regulating glucose transporter 4
(GLUT4) trafficking from specialized intracellular compartments, termed GLUT4
storage vesicles (GSVs), to the plasma membrane. Proteomic analysis of GSVs by
mass spectrometry revealed enrichment of 59 proteins in these vesicles. We
measured reduced abundance of 23 of these proteins following insulin stimulation
and assigned these as high confidence GSV proteins. These included established
GSV proteins such as GLUT4 and insulin-responsive aminopeptidase, as well as six
proteins not previously reported to be localized to GSVs. Tumor suppressor
candidate 5 (TUSC5) was shown to be a novel GSV protein that underwent a 3.7-fold
increase in abundance at the plasma membrane in response to insulin.
siRNA-mediated knockdown of TUSC5 decreased insulin-stimulated glucose uptake,
although overexpression of TUSC5 had the opposite effect, implicating TUSC5 as a
positive regulator of insulin-stimulated glucose transport in adipocytes.
Incubation of adipocytes with TNF? caused insulin resistance and a concomitant
reduction in TUSC5. Consistent with previous studies, peroxisome
proliferator-activated receptor (PPAR) ? agonism reversed TNF?-induced insulin
resistance. TUSC5 expression was necessary but insufficient for PPAR?-mediated
reversal of insulin resistance. These findings functionally link TUSC5 to GLUT4
trafficking, insulin action, insulin resistance, and PPAR? action in the
adipocyte. Further studies are required to establish the exact role of TUSC5 in
adipocytes.