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Shang A, Liu HY, Luo M, Xia Y, Yang X, Li HY, Wu DT, Sun Q, Geng F, Li HB, Gan RY. Sweet tea (Lithocarpus polystachyus rehd.) as a new natural source of bioactive dihydrochalcones with multiple health benefits. Crit Rev Food Sci Nutr 2020; 62:917-934. [DOI: 10.1080/10408398.2020.1830363] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ao Shang
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Hong-Yan Liu
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
| | - Min Luo
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Yu Xia
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
| | - Xiao Yang
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
| | - Hang-Yu Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Ding-Tao Wu
- Institute of Food Processing and Safety, College of Food Science, Sichuan Agricultural University, Ya’an, Sichuan, China
| | - Quancai Sun
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Fang Geng
- Key Laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), School of Food and Biological Engineering, Chengdu University, Chengdu, China
| | - Hua-Bin Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Ren-You Gan
- National Agricultural Science & Technology Center, Chengdu, China
- Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
- Key Laboratory of Coarse Cereal Processing (Ministry of Agriculture and Rural Affairs), School of Food and Biological Engineering, Chengdu University, Chengdu, China
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Bortoli S, Collinet M, Desbuquois B. Vanadate inhibits transcription of the rat insulin receptor gene via a proximal sequence of the 5'flanking region. Biochim Open 2018; 7:26-32. [PMID: 30416963 PMCID: PMC6205930 DOI: 10.1016/j.biopen.2018.09.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2018] [Accepted: 09/30/2018] [Indexed: 11/16/2022]
Abstract
Vanadate, a protein tyrosine phosphatase inhibitor which elicits insulin-like effects, has previously been shown to inhibit expression of the insulin receptor gene at the transcriptional level in rat hepatoma cells. In an attempt to identify the DNA sequence and transcription factors potentially involved in this effect, a fragment of the proximal 5'flanking region of the IR gene (-1143/-252 upstream the ATG codon) has been cloned and functionally characterized. RNase protection allowed the identification of several transcription start sites in the conserved region of the gene, among which two major sites at -455 and -396. Upon fusion to the luciferase gene and transient transfection into hepatoma cells, the -1143/-252 fragment showed promoter activity. This was unaffected by deletion of the -1143/-761 sequence, but markedly decreased (90%) by additional deletion of the -760/-465 sequence. Treatment of hepatoma cells with vanadate led to a dose-dependent decrease in promoter activity of the 1143/-252, -760/-252 and -464/-252 constructs (change relative to untreated cells, 40, 55 and 23% at 125 μM, and 70, 85 and 62% at 250 μM, respectively). These data suggest that although the entire DNA sequence upstream the transcription start sites is probably involved in vanadate-induced inhibition, the short sequence downstream of position -464 and is sufficient for inhibition. Potential targets of vanadate are the transcription factors FoxO1 and HMGA1, two downstream targets of the insulin signaling pathway which have been shown to mediate the inhibitory effect of insulin on IR gene expression.
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Key Words
- C/EBPβ, C/CAAT/enhancer binding protein β
- FoxO1, Forkhead box protein O1
- Gene transcription
- HMGA1, high mobility group A1 protein
- HNF4, hepatocyte nuclear factor 4
- Hepatoma cells
- IGFBP-1, insulin-like growth factor binding protein 1
- IR, insulin receptor
- Insulin receptor
- Liver
- PEPCK, phosphoenolpyruvate carboxykinase
- PI3K, phosphatidyl inositol 3-kinase
- Rat
- SINE, short interspersed nuclear element
- STZ, streptozotocin
- Sp1, specificity protein 1
- TCF7L2, T-cell specific transcription factor 7-like 2
- Vanadate
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Affiliation(s)
- Sylvie Bortoli
- INSERM UMR 1124, UFR des Sciences Fondamentales et Biomédicales, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Martine Collinet
- INSERM UMR 1124, UFR des Sciences Fondamentales et Biomédicales, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Bernard Desbuquois
- INSERM U1016, Institut Cochin, CNRS UMR8104, Université Paris Descartes, Sorbonne Paris Cité, Paris, France
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Gatica R, Bertinat R, Silva P, Carpio D, Ramírez MJ, Slebe JC, San Martín R, Nualart F, Campistol JM, Caelles C, Yáñez AJ. Altered expression and localization of insulin receptor in proximal tubule cells from human and rat diabetic kidney. J Cell Biochem 2013; 114:639-49. [PMID: 23059533 DOI: 10.1002/jcb.24406] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Accepted: 09/21/2012] [Indexed: 01/11/2023]
Abstract
Diabetes is the major cause of end stage renal disease, and tubular alterations are now considered to participate in the development and progression of diabetic nephropathy (DN). Here, we report for the first time that expression of the insulin receptor (IR) in human kidney is altered during diabetes. We detected a strong expression in proximal and distal tubules from human renal cortex, and a significant reduction in type 2 diabetic patients. Moreover, isolated proximal tubules from type 1 diabetic rat kidney showed a similar response, supporting its use as an excellent model for in vitro study of human DN. IR protein down-regulation was paralleled in proximal and distal tubules from diabetic rats, but prominent in proximal tubules from diabetic patients. A target of renal insulin signaling, the gluconeogenic enzyme phosphoenolpyruvate carboxykinase (PEPCK), showed increased expression and activity, and localization in compartments near the apical membrane of proximal tubules, which was correlated with activation of the GSK3β kinase in this specific renal structure in the diabetic condition. Thus, expression of IR protein in proximal tubules from type 1 and type 2 diabetic kidney indicates that this is a common regulatory mechanism which is altered in DN, triggering enhanced gluconeogenesis regardless the etiology of the disease.
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Affiliation(s)
- Rodrigo Gatica
- Instituto de Bioquímica y Microbiología, Facultad de Ciencias, Universidad Austral de Chile, Región de los Ríos, Valdivia, Chile
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Alkharfy KM, Al-Daghri NM, Yakout SM, Ahmed M. Calcitriol Attenuates Weight-Related Systemic Inflammation and Ultrastructural Changes in the Liver in a Rodent Model. Basic Clin Pharmacol Toxicol 2012; 112:42-9. [DOI: 10.1111/j.1742-7843.2012.00936.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Accepted: 08/08/2012] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | - Mukhtar Ahmed
- Transmission Electron Microscope Unit, College of Science Research Centre; King Saud University; Riyadh; Saudi Arabia
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Calle C, Maestro B, García-Arencibia M. Genomic actions of 1,25-dihydroxyvitamin D3 on insulin receptor gene expression, insulin receptor number and insulin activity in the kidney, liver and adipose tissue of streptozotocin-induced diabetic rats. BMC Mol Biol 2008; 9:65. [PMID: 18638371 PMCID: PMC2533347 DOI: 10.1186/1471-2199-9-65] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2007] [Accepted: 07/18/2008] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND this study set out to examine the effects of the treatment with 1,25-dihydroxyvitamin D3 (1,25D3) [150 IU/Kg (3.75 microg/Kg) one a day, for 15 days] to non-diabetic rats and in rats rendered diabetic by a single injection of streptozotocin [65 mg/kg]. RESULTS treatment with 1,25D3 to non-diabetic rats did not affect the biochemical parameters measured in the plasma and urine of these animals. Likewise, insulin receptor expression in the kidney, liver, or adipose tissue and insulin-stimulated glucose transport in adipocytes from these animals were not affected either. Treatment with 1,25D3 to streptozotocin-induced diabetic rats did not correct the hyperglycemia, hypoinsulinemia, glycosuria or ketonemia induced by the diabetes, although it partially reversed the over-expression of the insulin receptor gene in the liver and adipose tissue, without altering the normal expression of this gene in the kidney. These effects were accompanied by a normalization of the number of insulin receptors without altering receptor affinity but improving the insulin response to glucose transport in adipocytes from these diabetic animals. Moreover, a computer search in the rat insulin receptor promoter revealed the existence of two candidate vitamin D response element (VDRE) sequences located at -256/-219 bp and -653/-620 bp, the first overlapped by three and the second by four AP-2-like sites. CONCLUSION these genomic actions of 1,25D3 could represent beneficial effects associated with the amelioration of diabetes via mechanisms that possibly involve direct transcriptional activation of the rat insulin receptor gene. The candidate VDREs identified may respond to 1,25D3 via activation of the vitamin D receptor, although this remains to be investigated.
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Affiliation(s)
- Consuelo Calle
- Department of Biochemistry and Molecular Biology, School of Medicine, Complutense University, 28040-Madrid, Spain.
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Authier F, Merlen C, Amessou M, Danielsen GM. Use of high affinity insulin analogues to assess the functional relationships between insulin receptor trafficking, mitogenic signaling and mRNA expression in rat liver. Biochimie 2004; 86:157-66. [PMID: 15134829 DOI: 10.1016/j.biochi.2004.03.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2003] [Accepted: 03/12/2004] [Indexed: 11/21/2022]
Abstract
We have investigated the functional relationships between insulin receptor (IR) trafficking, mitogenic signaling and mRNA expression in rat liver and primary hepatocytes. The low-K(d) insulin analogues [His(A8),His(B4), Glu(B10),His(B27)]-human insulin (-HI) (the H2-analogue), [Asp(B10)]HI and [Glu(A13),Glu(B10)]HI, were studied in liver parenchymal cells and compared with wild-type HI and epidermal growth factor (EGF), a mitogenic inducer. The extent and duration of IR endocytosis were markedly increased in response to the H2-analogue and [Asp(B10)]HI compared to wild-type HI, but similar to HI after [Glu(A13),Glu(B10)]HI administration. Importantly, the insulin analogues induced a higher and more prolonged tyrosine phosphorylation of the IR-beta subunit in endosomes compared to authentic HI. A low cell-free endosome-lysosome transfer of the internalized IR was only observed in response to HI and H2-analogue injection. Concomitant with the low endosome-lysosome transfer of the intact IR-beta subunit, 47 and 50 kDa fragments of the IR-beta subunit accumulated in lysosomal fractions. Neither HI nor the insulin analogues promoted the endosomal recruitment and tyrosine phosphorylation of Shc, whereas EGF accessed the Shc signaling pathway. Moreover, EGF induced a fast and prolonged activation of Raf-1 and MAP-kinase pathways whereas HI and insulin analogues displayed a moderate and transient effect. Finally, treatment of primary rat hepatocytes with HI and the protease-resistant H2-analogue did not affect the total level and relative expression of isotype A and B of IR mRNA regardless of time of exposure. These results suggest a lack of relationship between IR trafficking, endosomal tyrosine phosphorylation and mitogenic signaling in rat liver in vivo.
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Affiliation(s)
- François Authier
- Faculté de Pharmacie Paris XI, Institut National de la Santé et de la Recherche Médicale U510, 5, rue Jean-Baptiste Clément, 92296 Châtenay-Malabry, France.
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Yu ZW, Burén J, Enerbäck S, Nilsson E, Samuelsson L, Eriksson JW. Insulin can enhance GLUT4 gene expression in 3T3-F442A cells and this effect is mimicked by vanadate but counteracted by cAMP and high glucose--potential implications for insulin resistance. Biochim Biophys Acta 2001; 1535:174-85. [PMID: 11342006 DOI: 10.1016/s0925-4439(00)00097-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
UNLABELLED It is well-established that high levels of cAMP or glucose can produce insulin resistance. The aim of this study was to characterize the interaction between these agents and insulin with respect to adipose tissue/muscle glucose transporter isoform (glucose transporter 4, GLUT4) gene regulation in cultured 3T3-F442A adipocytes and to further elucidate the GLUT4-related mechanisms in insulin resistance. Insulin (10(4) microU/ml) treatment for 16 h clearly increased GLUT4 mRNA level in cells cultured in medium containing 5.6 mM glucose but not in cells cultured in medium with high glucose (25 mM). 8-Bromo-cAMP (1 or 4 mM) or N(6)-monobutyryl cAMP, a hydrolyzable and a non-hydrolyzable cAMP analog, respectively, markedly decreased the GLUT4 mRNA level irrespective of glucose concentrations. In addition, these cAMP analogs also inhibited the upregulating effect of insulin on GLUT4 mRNA level. Interestingly, the tyrosine phosphatase inhibitor vanadate (1-50 microM) clearly increased GLUT4 mRNA level in a time- and concentration-dependent manner. Furthermore, cAMP-induced inhibition of the insulin effect was also prevented by vanadate. In parallel to the effects on GLUT4 gene expression, both insulin, vanadate and cAMP produced similar changes in cellular GLUT4 protein content and cAMP impaired the effect of insulin to stimulate (14)C-deoxyglucose uptake. In contrast, insulin, vanadate or cAMP did not alter insulin receptor (IR) mRNA or the cellular content of IR protein. IN CONCLUSION (1) Both insulin and vanadate elicit a stimulating effect on GLUT4 gene expression in 3T3-F442A cells, but a prerequisite is that the surrounding glucose concentration is low. (2) Cyclic AMP impairs the insulin effect on GLUT4 gene expression, but this is prevented by vanadate, probably by enhancing the tyrosine phosphorylation of signalling peptides and/or transcription factors. (3) IR gene and protein expression is not altered by insulin, vanadate or cAMP in this cell type. (4) The changes in GLUT4 gene expression produced by cAMP or vanadate are accompanied by similar alterations in GLUT4 protein expression and glucose uptake, suggesting a role of GLUT4 gene expression for the long-term regulation of cellular insulin action on glucose transport.
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Affiliation(s)
- Z W Yu
- Department of Medicine, Umeå University Hospital, Sweden
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