| 1989 |
SLC2A4/GLUT4 was molecularly cloned as a novel glucose transporter expressed exclusively in adipose tissue, skeletal muscle, and heart; when expressed in Xenopus oocytes it mediates cytochalasin B-inhibitable 2-deoxyglucose transport; insulin redistributes this transporter from low-density microsomes to the plasma membrane in adipocytes. |
cDNA cloning from skeletal muscle library, Xenopus oocyte expression assay, subcellular fractionation of rat adipocytes |
Cell |
High |
2649253
|
| 1989 |
The human SLC2A4/GLUT4 protein (509 amino acids) is the major insulin-regulatable glucose transporter in human skeletal muscle and fat; it is specifically recognized by monoclonal antibody 1F8 that identifies the insulin-responsive transporter in rat muscle, heart, and adipocytes, distinguishing it from GLUT1 and GLUT2. |
cDNA cloning from human intestine/muscle libraries, RNA blotting, in vitro translation, monoclonal antibody reactivity |
The Journal of biological chemistry |
High |
2656669
|
| 1992 |
GLUT4 expression confers two hallmark functional properties on L6 myoblasts: (i) a large insulin-stimulated component of glucose transport (5-fold increase) and (ii) cAMP-mediated inhibition of insulin-stimulated transport; neither property is present in GLUT1-only cells, establishing that these regulatory features are intrinsic to the GLUT4 isoform. |
Stable transfection of GLUT4 cDNA into L6 myoblasts; 2-deoxy[3H]glucose uptake assay; cAMP analog treatment; CHO cell transient expression of GLUT1 vs GLUT4 |
Proceedings of the National Academy of Sciences of the United States of America |
High |
1314390
|
| 1993 |
Phosphorylation of GLUT4 (induced by parathyroid hormone via cAMP/Ca2+ signaling) inversely correlates with its intrinsic transport activity: phosphorylated GLUT4 at the plasma membrane shows significantly reduced glucose transport activity without affecting its recruitment to the membrane, demonstrating that phosphorylation modulates GLUT4 intrinsic activity independently of translocation. |
32P-labeling of rat adipocytes, immunoprecipitation of GLUT4, [14C]2-deoxyglucose uptake in plasma membrane vesicles, in vitro phosphorylation assay, Western blotting |
The Journal of biological chemistry |
Medium |
8429011
|
| 1994 |
gp160 (IRAP/insulin-regulated aminopeptidase), the major non-GLUT4 protein of GLUT4-containing vesicles, has structural homology to aminopeptidase N and possesses aminopeptidase activity in vitro, establishing it as a functional enzyme co-resident in the GLUT4 storage vesicle. |
Purification of GLUT4-containing vesicles, sequence homology analysis, in vitro aminopeptidase activity assay |
The Journal of biological chemistry |
High |
7983006
|
| 1995 |
SHPTP2 (a protein-tyrosine phosphatase) is required for insulin-stimulated GLUT1 expression (via a p21ras-dependent pathway) but is dispensable for insulin-stimulated GLUT4 translocation to the cell surface, demonstrating that the two insulin-regulated glucose transport pathways diverge upstream of SHPTP2. |
Microinjection of GST-NC-SH2 fusion protein and anti-SHPTP2 antibodies into 3T3-L1 adipocytes; cell-surface GLUT4 quantification |
The Journal of biological chemistry |
Medium |
7768884
|
| 1997 |
Sortilin (glycoprotein 110) is a major protein component of GLUT4-containing storage vesicles in fat cells, identified by partial protein sequencing and cDNA cloning; it is highly expressed in fat, brain, and lung and dramatically upregulated during adipocyte differentiation. |
Purification of GLUT4-vesicle protein fraction, partial amino acid sequencing, cDNA cloning, Western blotting |
The Journal of biological chemistry |
High |
9305862
|
| 1997 |
GLUT4 storage vesicles (GSVs) represent a specialized compartment segregated from the endosomal and biosynthetic pathways, analogous to synaptic vesicles in neurons, and move directly to the plasma membrane in response to insulin. |
Subcellular fractionation, vesicle immunoisolation, kinetic trafficking studies in muscle and fat cells |
Diabetes |
Medium |
9356011
|
| 1999 |
PKBα/Akt1 is required for insulin-induced GLUT4 translocation in muscle cells: constitutively active PKBα increases cell-surface GLUT4myc, whereas a dominant-negative kinase-dead/phosphorylation-deficient Akt1 (AAA-PKB) almost completely blocks insulin-stimulated GLUT4myc appearance at the plasma membrane, independently of actin ruffling. |
L6-GLUT4myc myoblasts; transient transfection of constitutively active and dominant-negative PKB constructs; immunofluorescence of exofacial myc tag in non-permeabilized cells; GFP co-transfection to identify transfected cells |
Molecular and cellular biology |
High |
10330141
|
| 2000 |
Rab11 is a component of GLUT4-containing vesicles in cardiac muscle; insulin treatment recruits Rab11 from the microsomal fraction to the plasma membrane and increases its abundance in GLUT4 vesicles ~2.2-fold, implicating Rab11 in endosomal recycling and exocytotic movement of GLUT4. |
Subcellular fractionation, sucrose density gradient, immunoadsorption of GLUT4 vesicles, Western blotting, in vivo insulin treatment |
Diabetologia |
Medium |
11151761
|
| 2001 |
Adipose-selective knockout of GLUT4 (G4A-/- mice) markedly impairs insulin-stimulated glucose uptake in adipocytes and causes secondary insulin resistance in muscle and liver, manifested by decreased PI3K activation, demonstrating that adipose GLUT4 expression is required for normal whole-body glucose homeostasis and that adipose-derived signals regulate insulin sensitivity in other tissues. |
Cre/loxP tissue-selective gene knockout; hyperinsulinemic-euglycemic clamp; PI3K activity assay; glucose and insulin tolerance tests |
Nature |
High |
11217863
|
| 2001 |
Selective deletion of GLUT4 in the heart causes compensated cardiac hypertrophy with increased myocyte size and induction of ANP/BNP, while basal glucose transport is maintained through a 3-fold upregulation of GLUT1; insulin-stimulated glucose uptake in the heart is abolished. |
Cre/loxP cardiac-selective GLUT4 knockout (G4H-/- mice); glucose transport assay; Western blotting; echocardiography; gene expression analysis |
The Journal of clinical investigation |
High |
10606624
|
| 2001 |
The N-terminal phenylalanine-based motif (F5) of GLUT4 functions as a binding site for clathrin adaptor medium chains μ1, μ2, and μ3A (identified by yeast two-hybrid), and mutation of F5 substantially increases cell-surface GLUT4 by slowing endocytosis; mutation or deletion of C-terminal sequences alters GLUT4 membrane trafficking, with the C-terminal region required for maximal surface levels. |
Transient transfection of HA-epitope-tagged GLUT4 mutants in primary rat adipocytes; wortmannin and dominant-negative dynamin treatment; yeast two-hybrid screen |
Journal of cell science |
High |
11801731
|
| 2002 |
Protein kinase B (Akt) activity at intracellular GLUT4 vesicles is functionally required for insulin-stimulated vesicle translocation: kinase-inactive PKB fused to the N-terminus of GLUT4 (targeted to GLUT4 vesicles) acts as a highly effective dominant-negative inhibitor of IRAP translocation, whereas the same kinase-inactive PKB expressed in the cytoplasm has no effect. |
Fusion-protein targeting of constitutively active and kinase-inactive PKB to GLUT4 vesicles in 3T3-L1 adipocytes; cell-surface biotinylation of IRAP |
Journal of cell science |
Medium |
12082147
|
| 2002 |
Insulin activates GLUT4 through two separable pathways: (i) recruitment of transporters to the cell surface (translocation) and (ii) increase in intrinsic transporter activity; the two pathways are differentially sensitive to wortmannin, and p38 MAPK specifically regulates intrinsic GLUT4 activity rather than translocation. |
2-deoxy-[3H]glucose uptake in L6 myoblasts/adipocytes; wortmannin and p38 MAPK inhibitor treatment; subcellular fractionation |
Biochemistry and cell biology |
Medium |
12440698
|
| 2003 |
TUG forms a complex specifically with GLUT4 in unstimulated 3T3-L1 adipocytes; this complex is largely disassembled by insulin. TUG is localized with the insulin-mobilizable GLUT4 pool and is not itself mobilized to the plasma membrane. Dominant-negative TUG inhibits insulin-stimulated GLUT4 redistribution, indicating that TUG tethers endocytosed GLUT4 intracellularly and insulin releases this tether. |
Functional screen for GLUT4 distribution modulators; co-immunoprecipitation; subcellular localization; dominant-negative overexpression in CHO cells and 3T3-L1 adipocytes |
Nature |
High |
14562105
|
| 2003 |
GLUT4 is retained in adipocytes by a dynamic cycle of vesicle budding and fusion with endosomes: GLUT4 vesicles are 5× more likely to fuse with endosomes than with the plasma membrane; GLUT4 does not substantially accumulate in the TGN; and an intact microtubule cytoskeleton is required for insulin-stimulated but not basal GLUT4 trafficking. |
Kinetic trafficking studies in adipocytes; nocodazole disruption of microtubules; fluorescent GLUT4 tracking; subcellular fractionation comparing furin/TGN vs GLUT4 distribution |
Molecular biology of the cell |
High |
14595108
|
| 2003 |
Syntaxin 6 is found in >85% of GLUT4-containing vesicles and undergoes insulin-stimulated translocation to the plasma membrane; overexpression of its cytosolic domain increases basal GLUT4 at the cell surface and slows GLUT4 re-internalization after insulin withdrawal, implicating Syntaxin 6 in the trafficking step that sequesters GLUT4 into its storage compartment. |
Adenoviral overexpression of syntaxin cytosolic domains in 3T3-L1 adipocytes; glucose transport assay; cell-surface GLUT4 quantification; subcellular colocalization |
Molecular biology of the cell |
Medium |
12857877
|
| 2003 |
After endocytosis, GLUT4 rapidly transits through endosomes to a perinuclear compartment enriched in Syntaxins 6 and 16 (but not TGN38); Syntaxins 6 and 16 are upregulated during adipocyte differentiation and translocate to the cell surface with insulin; an acidic targeting motif in the GLUT4 C-terminus regulates its trafficking from endosomes to the TGN subdomain. |
Epitope-tagged GLUT4 internalization assay; vesicle immunoisolation; confocal colocalization; C-terminal GLUT4 mutant analysis in adipocytes |
Molecular biology of the cell |
High |
12631717
|
| 2004 |
PKB/Akt phosphorylates PIKfyve at Ser318 in response to insulin (PI3K-dependently), stimulating its PtdIns3P 5-kinase activity; PIKfyve colocalizes with a motile subpopulation of IRAP/GLUT4 vesicles, and overexpression of PIKfyve[S318A] enhances insulin-stimulated GLUT4 vesicle translocation, indicating that PKB-dependent PIKfyve phosphorylation regulates GLUT4 traffic. |
In vitro Akt kinase assay; phospho-specific antibody; PIKfyve[S318A] mutant overexpression in 3T3-L1 adipocytes; colocalization by immunofluorescence |
Journal of cell science |
Medium |
15546921
|
| 2004 |
C/EBPα but not PPARγ is required for GLUT4 expression during adipogenesis; PPARγ-differentiated cells form functional insulin-responsive GLUT4 vesicles (containing VAMP2, syntaxin-4, IRAP) and support IRAP translocation and exogenous GLUT4 translocation, demonstrating that the vesicle trafficking machinery is established independently of GLUT4 expression and that C/EBPα's major role is transcriptional regulation of GLUT4. |
Ectopic expression of C/EBPα and PPARγ in NIH 3T3 fibroblasts; sucrose gradient vesicle analysis; cell-surface biotinylation; reconstitution with GLUT4-myc |
Molecular and cellular biology |
High |
15282314
|
| 2005 |
AS160 (a Rab-GAP) is a negative regulator of basal GLUT4 exocytosis: AS160 knockdown increases basal surface GLUT4 and GLUT4 exocytosis 3-fold; this effect requires AS160 GAP domain activity since a GAP-mutant AS160 cannot restore normal GLUT4 retention, providing first direct evidence that AS160 GAP activity is required for basal GLUT4 retention. |
siRNA knockdown of AS160 in 3T3-L1 adipocytes; reexpression of wild-type vs GAP-mutant AS160; GLUT4 exocytosis kinetics; glucose uptake assay |
Cell metabolism |
High |
16213228
|
| 2005 |
Sortilin is both necessary and sufficient for biogenesis of GLUT4 storage vesicles (GSVs) in 3T3-L1 adipocytes: sortilin is induced on day 2 of adipocyte differentiation coinciding with GSV formation; sortilin knockdown reduces GSV formation and insulin-regulated glucose uptake; overexpression of sortilin increases GSV formation; co-expression of sortilin and GLUT4 in undifferentiated cells reconstitutes functional GSVs. |
siRNA knockdown; sortilin overexpression; GSV reconstitution by double transfection; subcellular fractionation; glucose uptake assay |
Developmental cell |
High |
15992544
|
| 2005 |
PKCζ directly interacts with munc18c; this interaction is increased ~3-fold by insulin and requires residues 295–338 of munc18c and the N-terminal region of PKCζ; disruption of this interaction by deletion mutants markedly inhibits insulin-stimulated GLUT4 translocation and glucose uptake, establishing a direct link between the PKCζ insulin-signaling kinase and the GLUT4 vesicle fusion machinery. |
Yeast two-hybrid screen with munc18c as bait; GST pull-down mapping; endogenous co-immunoprecipitation; GLUT4 translocation assay with deletion mutants |
Diabetologia |
Medium |
15986239
|
| 2006 |
ERα is a positive transcriptional regulator of GLUT4 in skeletal muscle: ERα−/− mice have severely reduced GLUT4 mRNA and protein at the muscle cell membrane, whereas ERβ acts as a suppressor (ERβ agonist reduces GLUT4 in ArKO mice); both ERα and ERβ are required for optimal caveolin-1 expression and colocalization with GLUT4. |
ERα−/−, ERβ−/−, and ArKO mouse models; immunohistochemistry; RT-PCR; Western blotting; ERβ agonist (DPN) treatment |
Proceedings of the National Academy of Sciences of the United States of America |
High |
16423895
|
| 2006 |
Atorvastatin (an HMG-CoA reductase inhibitor) attenuates GLUT4 (SLC2A4) expression and adipocyte maturation in 3T3-L1 cells by inhibiting isoprenoid biosynthesis; these effects are rescued by mevalonate or geranylgeranyl pyrophosphate supplementation, indicating that geranylgeranylation-dependent signaling is required for normal GLUT4 expression. |
3T3-L1 adipocyte culture; atorvastatin treatment with mevalonate/GGPP rescue; Western blotting and RT-PCR for SLC2A4; morphological adipocyte differentiation assessment; NSY mouse in vivo model |
Diabetologia |
Medium |
16685502
|
| 2008 |
AMPK regulates GLUT4 transcription by phosphorylating HDAC5 at Ser259 and Ser498: AMPK phosphorylation causes HDAC5 to associate with 14-3-3 proteins and undergo nuclear export, leading to histone H3 hyperacetylation at the GLUT4 promoter and increased GLUT4 gene expression in human primary myotubes. |
In vitro AMPK kinase assay; site-directed mutagenesis of HDAC5 phosphosites; phospho-specific antibodies; constitutively active/dominant-negative AMPK in human myotubes; chromatin immunoprecipitation (ChIP); GLUT4 reporter gene assay; AICAR treatment |
Diabetes |
High |
18184930
|
| 2008 |
Rab10 is present in GLUT4 vesicles (~5% of total Rab10) isolated from 3T3-L1 adipocyte low-density microsomes; siRNA knockdown of Rab10 (but not Rab8A, 8B, or 14) specifically inhibits GLUT4 translocation, implicating Rab10 as the principal AS160 substrate mediating GLUT4 exocytosis in adipocytes. |
siRNA knockdown of individual Rab GTPases in 3T3-L1 adipocytes; GLUT4 translocation assay; subcellular fractionation; GTP-loading state determination |
The Biochemical journal |
High |
18076383
|
| 2008 |
Molecular analysis of the GLUT4 promoter identified three cis-acting regulatory elements: a MEF2 binding domain and Domain I that can act as positive or negative regulators; GEF (GLUT4 enhancer factor) dimerizes with hypophosphorylated MEF2A, and MEF2A binding to its cognate site increases GEF DNA-binding activity to Domain I; the transcriptional co-repressor HDAC5 interacts with GEF in the absence of MEF2 to inhibit GLUT4 promoter activity. |
GEF structural domain mapping; GST pull-down; co-immunoprecipitation; gel shift (EMSA); chromatin immunoprecipitation; GLUT4 reporter gene assay in adipocytes |
The Journal of biological chemistry |
Medium |
18216015
|
| 2008 |
GLUT4 intracellular retention in adipocytes involves two linked cycles regulated by three distinct cytoplasmic motifs: the FQQI motif targets GLUT4 to an endosome-retention compartment cycle; the TELEY motif targets it to specialized GSV vesicles (under AS160 control); and the LL dileucine motif (with AP-1) controls return to basal retention after insulin withdrawal. |
Mutagenesis of GLUT4 trafficking motifs in 3T3-L1 adipocytes; AS160 knockdown; AP-1 knockdown; GLUT4 surface level quantification |
Molecular biology of the cell |
High |
18550797
|
| 2008 |
Contractile activity per se (electrically induced contraction of isolated soleus muscle) rapidly increases SLC2A4/GLUT4 mRNA and protein, and enhances binding of transcription factors MEF2D, HIF-1α, and TRα to the SLC2A4 promoter, as demonstrated by EMSA, supershift, and chromatin immunoprecipitation assays. |
Electrically induced contraction of isolated rat soleus muscle; EMSA and supershift assay; ChIP; RT-PCR; Western blotting |
American journal of physiology. Endocrinology and metabolism |
Medium |
18957617
|
| 2009 |
In rat and human skeletal muscle, insulin stimulates GLUT4 exocytosis ~6-fold (rate constants: basal 0.010–0.011 min⁻¹ vs insulin-stimulated 0.067–0.075 min⁻¹), quantitatively accounting for the observed increase in glucose transport; in contrast, AICAR (AMPK activator) does not markedly increase exocytosis, indicating that AMPK-mediated glucose uptake operates through a different mechanism than increased GLUT4 exocytosis rate. |
Biotinylated photoaffinity labeling of endogenous GLUT4 in isolated rat epitrochlearis and human vastus lateralis muscle; kinetic exocytosis assay |
Diabetes |
High |
19188436
|
| 2010 |
miR-223 increases GLUT4 protein expression in cardiomyocytes and this upregulation is necessary and sufficient to increase glucose uptake: siRNA knockdown of GLUT4 abolishes the miR-223-induced glucose uptake, and in vivo miR-223 inhibition reduces GLUT4 levels. |
Adenoviral miR-223 overexpression in neonatal rat cardiomyocytes; siRNA Glut4 knockdown; glucose uptake assay; in vivo miR-223 inhibitor |
Cardiovascular research |
Medium |
20080987
|
| 2010 |
In L6 skeletal muscle cells, both Rab13 and Rab8A are activated (GTP-loaded) by insulin downstream of AS160 and regulate GLUT4 vesicle traffic: Rab13 siRNA knockdown blocks insulin-induced surface GLUT4 gain and is rescued by a Rab13 ortholog but not Rab8A; constitutively active AS160 lowers surface GLUT4, rescued by overexpressing either Rab8A or Rab13; insulin promotes Rab13 colocalization with GLUT4 at the cell periphery. |
GTP-loading assay (effector pull-down); siRNA knockdown of Rab13 and Rab8A; rescue experiments; confocal colocalization; L6-GLUT4myc surface quantification |
Proceedings of the National Academy of Sciences of the United States of America |
High |
21041651
|
| 2010 |
SPARC interacts with AMPKα1 (identified by yeast two-hybrid and confirmed by endogenous co-immunoprecipitation); AMPK activation increases SPARC expression and SPARC knockdown reduces AICAR-stimulated AMPK phosphorylation; SPARC siRNA reduces GLUT4 expression in L6 myocytes, placing SPARC in the AMPK–GLUT4 regulatory axis. |
Yeast two-hybrid screen; endogenous Co-IP with specific antibodies; siRNA knockdown; Western blotting for GLUT4 |
Biochemical and biophysical research communications |
Low |
20460104
|
| 2013 |
NF-κB (p50 and p65 subunits) directly binds two κB sites at −134/−113 bp and −83/−62 bp in the mouse Slc2a4 promoter and represses Slc2a4 gene transcription; demonstrated by EMSA, ChIP in adipocytes, and reporter gene transfection experiments. |
Electrophoretic mobility shift assay (EMSA); chromatin immunoprecipitation (ChIP) in adipocytes; luciferase reporter transfection; computational promoter analysis |
Molecular and cellular endocrinology |
Medium |
23462193
|
| 2014 |
Insulin regulates GLUT4 trafficking through six distinct quantifiable steps; in adipocytes, sequestration of GLUT4 into GSVs from endosomes is highly regulated (insulin increases kseq 8-fold), and release from GSVs is rate-limiting in basal cells (controlled by AS160); the tethering/docking/fusion step is regulated by an AS160-independent mechanism, and insulin increases the combined rate constant for release and fusion of GSVs 40-fold. |
Quantitative kinetic trafficking assay of GLUT4, transferrin receptor, and LRP1 in adipocytes and fibroblasts; AS160 knockdown; mathematical modeling of trafficking rate constants |
The Journal of biological chemistry |
High |
24778187
|
| 2015 |
GLUT4 is palmitoylated at Cys223; mutation of Cys223 to serine (C223S) abolishes insulin-dependent GLUT4 membrane translocation and excludes GLUT4 from tubular-vesicular structures containing insulin-responsive vesicles, demonstrating that palmitoylation at this site is required for GLUT4 sorting into insulin-responsive GSVs. |
Palmitoylation site mutagenesis (C223S); subcellular localization by imaging; cell-surface GLUT4 translocation assay in adipocytes and CHO-IR cells |
Biochemical and biophysical research communications |
Medium |
25824042
|
| 2015 |
ZFP407 regulates GLUT4 expression by controlling both Glut4 mRNA transcription and pre-mRNA splicing efficiency; ZFP407 loss reduces GLUT4 mRNA and protein, impairing insulin-stimulated glucose uptake; ZFP407 is required for the PPARγ agonist rosiglitazone to increase Glut4 expression and synergizes with PPARγ to activate a PPARγ reporter. |
Targeted siRNA screen; Glut4 mRNA/protein quantification; nascent transcription analysis; pre-mRNA splicing assay; transcriptome-wide analysis; co-overexpression reporter assay in adipocytes |
The Journal of biological chemistry |
Medium |
25596527
|
| 2017 |
DHHC7 is the major palmitoyl acyltransferase (PAT) for GLUT4 at Cys223: among 23 DHHC proteins, DHHC7 overexpression increases GLUT4 palmitoylation while DHHC7 knockdown and DHHC7 KO in adipose tissue/muscle decrease palmitoylation; DHHC7 KO suppresses insulin-dependent GLUT4 membrane translocation and causes hyperglycemia and glucose intolerance in vivo. |
Ectopic expression of 23 DHHC proteins; siRNA knockdown in 3T3-L1 adipocytes; DHHC7 KO mice; palmitoylation assay; GLUT4 translocation assay; glucose tolerance test |
The Journal of biological chemistry |
High |
28057756
|
| 2017 |
Sortilin together with retromer retrieves GLUT4 from lysosomal degradation and returns it to the TGN for GSV formation: the luminal Vps10p domain of sortilin interacts with the first luminal loop of GLUT4, and the cytoplasmic tail of sortilin binds to retromer; retromer ablation decreases sortilin and GLUT4 stability, blocks their entry into small vesicular carriers, prevents GLUT4 from reaching the insulin-responsive compartment, and suppresses insulin-stimulated glucose uptake. |
Co-immunoprecipitation mapping of sortilin-GLUT4 luminal domain interaction; retromer subunit siRNA knockdown; sucrose gradient fractionation; insulin-stimulated glucose uptake assay in 3T3-L1 adipocytes |
Molecular biology of the cell |
High |
28450454
|
| 2018 |
Tbc1d1 and AS160 cooperatively regulate GLUT4 release: when both are present, Tbc1d1 functionally dominates; AS160 modulates the sensitivity of Tbc1d1-mediated GLUT4 release to Ca2+ and insulin; cooperative activity requires the PTB1 and calmodulin-binding domains of Tbc1d1 and key phosphorylation sites AS160-Thr642 and Tbc1d1-Ser237/Thr596. |
GLUT4 nanometry; cell-based reconstitution models with variable expression ratios; mutational analysis of domain deletions and phosphorylation site mutations; AICAR, Ca2+, and insulin stimulation |
The Journal of biological chemistry |
High |
30482843
|
| 2019 |
Estradiol (E2) stimulates Slc2a4/GLUT4 expression via an ESR1 (estrogen receptor α)-dependent and CEBPA-mediated mechanism: ESR1 silencing (~50%) in mature adipocytes abolishes E2-induced nuclear CEBPA accumulation, Slc2a4/GLUT4 expression, and GLUT4 translocation to the plasma membrane. |
3T3-L1 adipocyte differentiation; Esr1 siRNA silencing; CEBP/Slc2a4-binding activity; nuclear CEBPA quantification; GLUT4 translocation assay; mRNA and protein quantification |
Molecular and cellular endocrinology |
Medium |
31100494
|
| 2020 |
TBC1D4-RAB10 signaling module controls GLUT4 mobilization from a trans-Golgi network (TGN) storage compartment: RAB10 knockdown traps GLUT4 in a TGN domain that also stores lysosomal proteins and ATP7A; insulin-mobilized GLUT4 but not ATP7A requires RAB10, demonstrating that insulin acts deep within the cell at the TGN in addition to at the plasma membrane proximal steps. |
RAB10 siRNA knockdown in adipocytes; confocal microscopy; co-localization with TGN markers, lysosomal cargo, ATP7A; insulin and copper stimulation; GLUT4 translocation assay |
Molecular biology of the cell |
High |
33175605
|
| 2020 |
CHC22 clathrin mediates GLUT4 pathway biogenesis from the ER-to-Golgi intermediate compartment (ERGIC): CHC22 localizes to the ERGIC and forms a complex with ERGIC tether p115, GLUT4, and sortilin; downregulation of CHC22 or p115 (but not GM130 or sortilin) abolishes insulin-responsive GLUT4 release, defining ERGIC-to-TGN trafficking as the initiation point of human GLUT4 sequestration. |
Subcellular localization of CHC22 by immunofluorescence; co-immunoprecipitation of CHC22-p115-GLUT4-sortilin complex; siRNA knockdown of CHC22 vs p115 vs GM130 vs sortilin; insulin-stimulated GLUT4 release assay; Legionella replication vacuole formation assay |
The Journal of cell biology |
High |
31863584
|
| 2015 |
Excessive caloric intake causes oxidative carbonylation of GLUT4 near its glucose transport channel in human adipose tissue, likely reducing GLUT4 activity and contributing to the early onset of insulin resistance; this was associated with oxidative stress but without inflammatory or ER stress. |
Controlled overfeeding (~6000 kcal/day) in healthy men; adipose tissue proteomics (mass spectrometry); GLUT4 carbonylation site mapping; hyperinsulinemic-euglycemic clamp |
Science translational medicine |
Medium |
26355033
|
| 2014 |
Ca2+ elevation in L6 muscle cells promotes GLUT4 exocytosis via CaMKIIδ and AMPKα1/α2 activation while simultaneously slowing GLUT4 endocytosis via novel PKC isoforms; siRNA knockdown of CaMKIIδ or AMPKα1/α2 partially reduces ionomycin-induced GLUT4 exocytosis but does not affect reduced endocytosis, whereas novel PKC inhibition specifically reverses the slowing of endocytosis. |
Ionomycin treatment of L6-GLUT4myc cells; siRNA knockdown of CaMKIIδ, AMPKα1/α2; pharmacological inhibitors of CaMKII (CN21), AMPK (Compound C), and PKC isoforms (Gö6976/Gö6983); live-cell GLUT4 exocytosis and endocytosis kinetics |
American journal of physiology. Endocrinology and metabolism |
Medium |
24895284
|