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PMID |
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1 |
9371825
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A nonsense mutation (Q268X) in exon 7 of the HNF4alpha gene is responsible for an autosomal dominant, early-onset form of non-insulin-dependent diabetes mellitus (maturity-onset diabetes of the young; gene named MODY1).
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2 |
9371825
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By exploiting this system we have identified several genes encoding components of the glucose-dependent insulin secretion pathway whose expression is dependent upon HNF4alpha.
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3 |
9371825
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These include glucose transporter 2, and the glycolytic enzymes aldolase B and glyceraldehyde-3-phosphate dehydrogenase, and liver pyruvate kinase.
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4 |
10944108
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In addition to reduced expression of the genes encoding insulin, glucose transporter-2, L-pyruvate kinase, aldolase B and 3-hydroxy-3-methylglutaryl coenzyme A reductase, induction of HNF1 alpha-P291fsinsC also significantly inhibits expression of mitochondrial 2-oxoglutarate dehydrogenase (OGDH) E1 subunit mRNA and protein.
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5 |
10944108
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In contrast, the mRNA and protein levels of mitochondrial uncoupling protein-2 were dramatically increased by HNF1 alpha-P291fsinsC induction.
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6 |
10944108
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As predicted from this altered gene expression profile, HNF1 alpha-P291fsinsC also inhibits insulin secretory responses to glucose and leucine, correlated with impaired nutrient-evoked mitochondrial ATP production and mitochondrial membrane hyperpolarization.
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7 |
10967120
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Mutations in the HNF4alpha gene are associated with the subtype 1 of maturity-onset diabetes of the young (MODY1), which is characterized by impaired insulin secretory response to glucose in pancreatic beta-cells.
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8 |
10967120
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The tetracycline-inducible system was employed to achieve tightly controlled expression of both wild type (WT) and dominant-negative mutant (DN) of HNF4alpha in INS-1 cells.
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9 |
10967120
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Quantitative evaluation of HNF4alpha-regulated pancreatic beta-cell gene expression revealed altered mRNA levels of insulin, glucose transporter-2, L-pyruvate kinase, aldolase B, 2-oxoglutarate dehydrogenase E1 subunit, and mitochondrial uncoupling protein-2.
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10 |
10967120
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Indeed, HNF4alpha changed the HNF1alpha mRNA levels and HNF1alpha promoter luciferase activity through altered HNF4alpha binding.
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11 |
11319921
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The G6Pase promoter incorporated with intronic enhancers of the aldolase B gene was used to direct insulin gene expression in the liver of streptozotocin-induced diabetic nude rats.
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12 |
11423471
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Mutations in the HNF4alpha gene are responsible for type 1 maturity-onset diabetes of the young (MODY1), which is characterized by a defect in insulin secretion.
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13 |
11423471
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Recent evidence has implicated AMP-activated protein kinase (AMPK) in the modulation of both insulin secretion by pancreatic beta-cells and the control of glucose-dependent gene expression in both hepatocytes and beta-cells.
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14 |
11423471
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Therefore, the question could be raised as to whether AMPK plays a role in these processes by modulating HNF-4alpha function.
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15 |
11423471
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In this study, we show that activation of AMPK by 5-amino-4-imidazolecarboxamide riboside (AICAR) in hepatocytes greatly diminished HNF-4alpha protein levels and consequently downregulates the expression of HNF-4alpha target genes.
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16 |
11423471
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Quantitative evaluation of HNF-4alpha target gene expression revealed diminished mRNA levels for HNF-1alpha, GLUT2, L-type pyruvate kinase, aldolase B, apolipoprotein (apo)-B, and apoCIII.
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17 |
11423471
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Our data clearly demonstrate that the MODY1/HNF-4alpha transcription factor is a novel target of AMPK in hepatocytes.
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18 |
11423471
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Accordingly, it can be suggested that in pancreatic beta-cells, AMPK also acts by decreasing HNF-4alpha protein level, and therefore insulin secretion.
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19 |
11904435
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Profound defects in pancreatic beta-cell function in mice with combined heterozygous mutations in Pdx-1, Hnf-1alpha, and Hnf-3beta.
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20 |
11904435
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In mice, a heterozygous mutation in Pdx-1 alone, but not Hnf-1alpha(+/-), Hnf-3beta(+/-), or Hnf-4alpha(+/-), causes impaired glucose-stimulated insulin secretion in mice.
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21 |
11904435
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To investigate the possible functional relationships between these transcription factors on beta-cell activity in vivo, we generated mice with the following combined heterozygous mutations: Pdx-1(+/-)/Hnf-1alpha(+/-), Pdx-1(+/-)/Hnf-3beta(+/-), Pdx-1(+/-)/Hnf-4alpha(+/-), Hnf-1alpha(+/-)/Hnf-4alpha(+/-), and Hnf-3beta(+/-)/Hnf-4alpha(+/-).
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22 |
11904435
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The greatest loss in function was in combined heterozygous null alleles of Pdx-1 and Hnf-1alpha (Pdx-1(+/-)/Hnf-1alpha(+/-)), or Pdx-1 and Hnf-3beta (Pdx-1(+/-)/Hnf-3beta(+/-)).
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23 |
11904435
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Both double mutants develop progressively impaired glucose tolerance and acquire a compromised first- and second-phase insulin secretion profile in response to glucose compared with Pdx-1(+/-) mice alone.
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24 |
11904435
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The loss in beta-cell function in Pdx-1(+/-)/Hnf-3beta(+/-) mice was associated with decreased expression of Nkx-6.1, glucokinase (Gck), aldolase B (aldo-B), and insulin, whereas Nkx2.2, Nkx-6.1, Glut-2, Gck, aldo-B, the liver isoform of pyruvate kinase, and insulin expression was reduced in Pdx-1(+/-)/Hnf-1alpha(+/-) mice.
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25 |
11904435
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The islet cell architecture was also abnormal in Pdx-1(+/-)/Hnf-3beta(+/-) and Pdx-1(+/-)/Hnf-1alpha(+/-) mice, with glucagon-expressing cells scattered throughout the islet, a defect that may be connected to decreased E-cadherin expression.
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26 |
12646233
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Six genes (met proto-oncogene, ATP-binding cassette transporter A1, fatty acid binding protein 2, LDL receptor defect C complementing, aldolase B, and sulfonylurea receptor) were shown to be associated with DM.
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27 |
19106228
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Emerging evidence indicates that aldosterone causes oxidative stress by stimulating proinflammatory/oxidative mediators, including nuclear factor-kappaB, activating protein (AP-1), and c-Jun N-terminal kinase.
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28 |
19106228
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Thus, in insulin-resistant type 2 diabetes (T2D), oxidative stress generated by hyperglycemia and aldosterone would potentiate the oxidative destruction of tissue and important regulators of glucose metabolism like adiponectin and insulin.
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29 |
19106228
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In contrast, reduced aldosterone alongside markers/mediators of oxidative stress, including 8-isoprostane, c-Jun N-terminal kinase, nuclear factor-kappaB, AP-1, and AP-2 were observed.
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30 |
19106228
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Interestingly, in hemin-treated ZDF, inhibitory proteins of insulin-signaling, such as glycogen synthase kinase-3 and protein-tyrosine phosphatase-1B were reduced, whereas agents that promote insulin signaling including adiponectin, cAMP, AMP-activated protein kinase, aldolase-B, and glucose transporter-4 (GLUT4), were robustly increased.
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31 |
19106228
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Correspondingly, hemin improved ip glucose tolerance, reduced insulin intolerance, and lowered insulin resistance (homeostasis model assessment of insulin resistance), and the inability of insulin to enhance GLUT4 was overturned.
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32 |
19106228
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The synergistic interaction between the HO system, aldolase-B, adiponectin, AMP-activated protein kinase, and GLUT4 may be explored for novel strategies against postprandial/fasting hyperglycemia and insulin-resistant T2D.
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33 |
19106228
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Emerging evidence indicates that aldosterone causes oxidative stress by stimulating proinflammatory/oxidative mediators, including nuclear factor-kappaB, activating protein (AP-1), and c-Jun N-terminal kinase.
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34 |
19106228
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Thus, in insulin-resistant type 2 diabetes (T2D), oxidative stress generated by hyperglycemia and aldosterone would potentiate the oxidative destruction of tissue and important regulators of glucose metabolism like adiponectin and insulin.
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35 |
19106228
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In contrast, reduced aldosterone alongside markers/mediators of oxidative stress, including 8-isoprostane, c-Jun N-terminal kinase, nuclear factor-kappaB, AP-1, and AP-2 were observed.
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36 |
19106228
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Interestingly, in hemin-treated ZDF, inhibitory proteins of insulin-signaling, such as glycogen synthase kinase-3 and protein-tyrosine phosphatase-1B were reduced, whereas agents that promote insulin signaling including adiponectin, cAMP, AMP-activated protein kinase, aldolase-B, and glucose transporter-4 (GLUT4), were robustly increased.
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37 |
19106228
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Correspondingly, hemin improved ip glucose tolerance, reduced insulin intolerance, and lowered insulin resistance (homeostasis model assessment of insulin resistance), and the inability of insulin to enhance GLUT4 was overturned.
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38 |
19106228
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The synergistic interaction between the HO system, aldolase-B, adiponectin, AMP-activated protein kinase, and GLUT4 may be explored for novel strategies against postprandial/fasting hyperglycemia and insulin-resistant T2D.
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39 |
19252740
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HNF4alpha and HNF1alpha dysfunction as a molecular rational for cyclosporine induced posttransplantation diabetes mellitus.
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40 |
19252740
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Furthermore, cyclosporine treatment of the insulinoma-1E cell line resulted in remarkable reduction in HNF4alpha protein and INS1 as well as INS2 gene expression, while transcript expression of HNF4alpha, apolipoprotein C2, glycerolkinase, pyruvatekinase and aldolase B was repressed in treated Caco-2 cells.
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41 |
23052196
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Results show a consistent down-regulation of HNF1α and HNF4α under a scenario of exposure where HepG2 cells (1) gained resistance to arsenic-induced toxicity/apoptosis, (2) attained loss of tissue-specific features (as shown by the observed down-regulation of ALDOB, PEPCK and CYP1A2, triggering of the epithelial-to-mesenchymal transition program and the hypersecretion of matrix metalloproteinase-2 and 9), (3) failed to maintain balanced expression of the "stemness" genes C-MYC, OCT3/4, LIN28 and NOTCH2 and (4) showed glucose metabolism impairment.
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