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PMID |
Sentence |
1 |
14531794
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Overexpression of VDUP-1 gene in cultured mesangial cells resulted in type IV collagen alpha1 chain (COL4A1) mRNA induction and accumulation of type IV collagen protein.
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2 |
14531794
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However, induction of COL4A1 expression was abolished with a deletion mutant of VDUP-1, which lost thioredoxin-interacting domain.
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3 |
14531794
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VDUP-1 mediates collagen accumulation in mesangial cells and could be the molecular mediator/marker for fibrosis in diabetic nephropathy caused by chronic hyperglycemia such as diabetes.
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4 |
15128745
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Here we show that hyperglycemia inhibits thioredoxin ROS-scavenging function through p38 MAPK-mediated induction of Txnip.
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5 |
15128745
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Diabetic animals exhibited increased vascular expression of Txnip and reduced thioredoxin activity, which normalized with insulin treatment.
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6 |
15128745
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These studies implicate reduced thioredoxin activity through interaction with Txnip as an important mechanism for vascular oxidative stress in diabetes mellitus.
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7 |
15705778
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We therefore generated a stable transfected beta-cell line (INS-1) overexpressing human TXNIP and found that TXNIP overexpression induced apoptosis as assessed by Bax, Bcl2, caspase-3, and cleaved caspase-9 as well as Hoechst staining.
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8 |
16143294
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Thus, aside from regulating the cellular redox, TXNIP does modulate overall gene transcription and thereby may further enhance beta-cell death and impair insulin secretion.
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9 |
17555594
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The inhibition of the glucose transporter GLUT1 by phloretin notably reduces TXNIP RNA level and the inhibition of the p38 MAP kinase activity by SB203580 reverses the effects of TXNIP on ROS-TRX activity.
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10 |
19214472
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In contrast, adding insulin to the culture medium or stimulating insulin secretion with different secretagogues suppressed TXNIP.
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11 |
19214472
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Inhibition of glucose and fatty acid-stimulated insulin secretion with diazoxide increased TXNIP production in beta cells.
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12 |
19214472
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Nitric oxide (NO), a repressor of TXNIP, enhanced insulin signal transduction, whereas inhibition of NO synthase abolished its activation, suggesting that TXNIP inhibition by NO is mediated by stimulation of insulin signalling.
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13 |
19214472
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Insulin is a potent repressor of TXNIP, operating a negative feedback loop that restrains the stimulation of TXNIP by chronic hyperglycaemia.
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14 |
19808645
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Hence, this study was undertaken to determine whether Txnip expression is regulated by the transcription factors KLF6 and PPAR-gamma.
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15 |
19808645
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By using siRNAs and overexpressing constructs, the role of KLF6 and PPAR-gamma in Txnip transcriptional regulation was determined in human kidney proximal tubule cells and in streptozocin-induced diabetes mellitus in Sprague-Dawley rats, in vitro and in vivo models of diabetic nephropathy, respectively.
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16 |
19808645
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In contrast, reduced expression of KLF6 by siRNA or exposure to PPAR-gamma agonists attenuated high glucose-induced Txnip expression and promoter activity.
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17 |
19808645
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Hence, Txnip expression and promoter activity are mediated via divergent effects of KLF6 and PPAR-gamma transcriptional regulation.
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18 |
20023662
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Here we show that NLRP3 interacted with thioredoxin (TRX)-interacting protein (TXNIP), a protein linked to insulin resistance.
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19 |
20023662
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Inflammasome activators such as uric acid crystals induced the dissociation of TXNIP from thioredoxin in a reactive oxygen species (ROS)-sensitive manner and allowed it to bind NLRP3.
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20 |
20023662
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TXNIP deficiency impaired activation of the NLRP3 inflammasome and subsequent secretion of interleukin 1beta (IL-1beta).
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21 |
19223654
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Furthermore, when corrected for insulin content, isolated pancreatic islets from TxNIP(-/-) mice exhibited reduced glucose-induced insulin secretion.
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22 |
19959470
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In mitochondria, TXNIP binds to and oxidizes Trx2, thereby reducing Trx2 binding to ASK1 and allowing for ASK1 phosphorylation/activation, resulting in induction of the mitochondrial pathway of apoptosis with cytochrome c release and caspase-3 cleavage.
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23 |
21508227
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Hypothalamic expression of TXNIP is induced by acute nutrient excess and in mouse models of obesity and diabetes, and downregulation of mediobasal hypothalamic TXNIP expression prevents diet-induced obesity and insulin resistance.
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24 |
21622171
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MondoA also senses glutaminolytic flux into the tricarboxylic acid cycle and appears to coordinate the utilization of glucose and glutamine by regulating expression of thioredoxin interacting protein.
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25 |
20299477
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As increased adipogenesis and insulin sensitivity suggested aspects of augmented peroxisome proliferator-activated receptor-gamma (PPARgamma) response, we investigated Txnip's regulation of PPARgamma function; manipulation of Txnip expression directly regulated PPARgamma expression and activity.
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26 |
20299477
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Txnip deletion promotes adiposity in the face of high-fat caloric excess; however, loss of this alpha-arrestin protein simultaneously enhances insulin responsiveness in fat and skeletal muscle, revealing Txnip as a novel mediator of insulin resistance and a regulator of adipogenesis.
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27 |
21615774
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The expression of TRX and insulin in islets and plasma SOD and CAT activity were lower, but the expression of TXNIP in islets and plasma MDA were higher, in diabetic compared with normal control rats.
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28 |
21615774
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Upregulated expression of TRX and insulin and downregulated expression of TXNIP were observed in probucol-treated diabetic rats.
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29 |
18171713
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Incubation of INS-1 cells at 25 mmol/l glucose for 24 h led to an 18-fold increase in TXNIP protein, as assessed by immunoblotting.
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30 |
18171713
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In contrast, TXNIP-deficient HcB-19 islets were protected against glucose-induced apoptosis as measured by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling and caspase-3, indicating that TXNIP is a required causal link between glucose toxicity and beta-cell death.
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31 |
19411249
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Furthermore, we found that the co-activator and histone acetyltransferase p300 co-immunoprecipitates with ChREBP and also binds to the txnip promoter in response to glucose.
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32 |
19411249
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Thus, with this study we have identified ChREBP as the transcription factor that mediates glucose-induced txnip expression in human islets and INS-1 beta cells and have characterized the chromatin modification associated with glucose-induced txnip transcription.
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