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Wang AJ, Wang A, Hascall V. Detoxification of Hyperglycemia-induced Glucose Toxicity by the Hexosamine Biosynthetic Pathway. FRONT BIOSCI-LANDMRK 2024; 29:71. [PMID: 38420831 DOI: 10.31083/j.fbl2902071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 11/23/2023] [Accepted: 01/12/2024] [Indexed: 03/02/2024]
Abstract
The abnormal intermediate glucose metabolic pathways induced by elevated intracellular glucose levels during hyperglycemia often establish the metabolic abnormality that leads to cellular and structural changes in development and to progression of diabetic pathologies. Glucose toxicity generally refers to the hyperglycemia-induced irreversible cellular dysfunctions over time. These irreversible cellular dysfunctions in diabetic nephropathy include: (1) inflammatory responses, (2) mesangial expansion, and (3) podocyte dysfunction. Using these three cellular events in diabetic nephropathy as examples of glucose toxicity in the diabetic complications, this review focuses on: (1) the molecular and cellular mechanisms associated with the hexosamine biosynthetic pathway that underly glucose toxicity; and (2) the potential therapeutic tools to inhibit hyperglycemia induced pathologies. We propose novel therapeutic strategies that directly shunts intracellular glucose buildup under hyperglycemia by taking advantage of intracellular glucose metabolic pathways to dampen it by normal synthesis and secretion of hyaluronan, and/or by intracellular chondroitin sulfate synthesis and secretion. This could be a useful way to detoxify the glucose toxicity in hyperglycemic dividing cells, which could mitigate the hyperglycemia induced pathologies in diabetes.
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Affiliation(s)
- Andrew Jun Wang
- School of Medicine, New York Medical College, Valhalla, NY 10595, USA
| | - Aimin Wang
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Vincent Hascall
- Department of Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
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Martinelli M, Romanello D. Chemical Variations Induced by Ozonization of 5% Glucose Solution and Evaluation of Generated Compounds. Cureus 2024; 16:e52946. [PMID: 38406063 PMCID: PMC10893995 DOI: 10.7759/cureus.52946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2024] [Indexed: 02/27/2024] Open
Abstract
The most commonly studied method of administering ozone therapy is systemic ozone therapy. However, there may be situations where this method is not feasible due to technical issues, such as poor vein condition or anemia. As an alternative method, pre-ozonized solutions, such as 0.9% saline solution, have been investigated for their ease of preparation and administration. However, concerns have been raised regarding the formation of chlorine compounds. Currently, there is no available literature on the treatment potential of pre-ozonized glucose solution. The objective of this study is to compare and evaluate the chemical changes induced by ozonization of a 5% glucose solution and determine if any toxic compounds are produced. Our findings indicate that the chemical alterations following ozone infusion are quantitatively minimal and pose a negligible risk in terms of safety.
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Affiliation(s)
- Mauro Martinelli
- Department of Biomedical Sciences, Ozone Therapy Unit, Ospedale San Pietro Fatebenefratelli, Rome, ITA
| | - Daniele Romanello
- Department of Internal Medicine, Ospedale San Pietro Fatebenefratelli, Rome, ITA
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Liu T, Zhuang Z, Wang D. Paeoniflorin mitigates high glucose-induced lifespan reduction by inhibiting insulin signaling in Caenorhabditis elegans. Front Pharmacol 2023; 14:1202379. [PMID: 37405055 PMCID: PMC10315627 DOI: 10.3389/fphar.2023.1202379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 06/12/2023] [Indexed: 07/06/2023] Open
Abstract
In organisms, high glucose can cause several aspects of toxicity, including the lifespan reduction. Paeoniflorin is the major component of Paeoniaceae plants. Nevertheless, the possible effect of paeoniflorin to suppress high glucose toxicity in reducing lifespan and underlying mechanism are largely unclear. Thus, in this study, we examined the possible effect of paeoniflorin in suppressing high glucose (50 mM)-induced lifespan reduction and the underlying mechanism in Caenorhabditis elegans. Administration with 16-64 mg/L paeoniflorin could prolong the lifespan in glucose treated nematodes. Accompanied with this beneficial effect, in glucose treated nematodes, expressions of daf-2 encoding insulin receptor and its downstream kinase genes (age-1, akt-1, and akt-2) were decreased and expression of daf-16 encoding FOXO transcriptional factor was increased by 16-64 mg/L paeoniflorin administration. Meanwhile, the effect of paeoniflorin in extending lifespan in glucose treated nematodes was enhanced by RNAi of daf-2, age-1, akt-1, and akt-2 and inhibited by RNAi of daf-16. In glucose treated nematodes followed by paeoniflorin administration, the increased lifespan caused by daf-2 RNAi could be suppressed by RNAi of daf-16, suggesting that DAF-2 acted upstream of DAF-16 to regulate pharmacological effect of paeoniflorin. Moreover, in glucose treated nematodes followed by paeoniflorin administration, expression of sod-3 encoding mitochondrial Mn-SOD was inhibited by daf-16 RNAi, and the effect of paeoniflorin in extending lifespan in glucose treated nematodes could be suppressed by sod-3 RNAi. Molecular docking analysis indicated the binding potential of paeoniflorin with DAF-2, AGE-1, AKT-1, and AKT-2. Therefore, our results demonstrated the beneficial effect of paeoniflorin administration in inhibiting glucose-induced lifespan reduction by suppressing signaling cascade of DAF-2-AGE-1-AKT-1/2-DAF-16-SOD-3 in insulin signaling pathway.
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Affiliation(s)
- Tianwen Liu
- School of Pharmaceutical Engineering and Life Science, Changzhou University, Changzhou, China
- Medical School, Southeast University, Nanjing, China
| | - Ziheng Zhuang
- School of Pharmaceutical Engineering and Life Science, Changzhou University, Changzhou, China
| | - Dayong Wang
- Medical School, Southeast University, Nanjing, China
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Furth-Lavi J, Hija A, Tornovsky-Babeay S, Mazouz A, Dahan T, Stolovich-Rain M, Klochendler A, Dor Y, Avrahami D, Glaser B. Glycemic control releases regenerative potential of pancreatic beta cells blocked by severe hyperglycemia. Cell Rep 2022; 41:111719. [PMID: 36450253 PMCID: PMC9789023 DOI: 10.1016/j.celrep.2022.111719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 07/16/2022] [Accepted: 11/02/2022] [Indexed: 12/03/2022] Open
Abstract
Diabetogenic ablation of beta cells in mice triggers a regenerative response whereby surviving beta cells proliferate and euglycemia is regained. Here, we identify and characterize heterogeneity in response to beta cell ablation. Efficient beta cell elimination leading to severe hyperglycemia (>28 mmol/L), causes permanent diabetes with failed regeneration despite cell cycle engagement of surviving beta cells. Strikingly, correction of glycemia via insulin, SGLT2 inhibition, or a ketogenic diet for about 3 weeks allows partial regeneration of beta cell mass and recovery from diabetes, demonstrating regenerative potential masked by extreme glucotoxicity. We identify gene expression changes in beta cells exposed to extremely high glucose levels, pointing to metabolic stress and downregulation of key cell cycle genes, suggesting failure of cell cycle completion. These findings reconcile conflicting data on the impact of glucose on beta cell regeneration and identify a glucose threshold converting glycemic load from pro-regenerative to anti-regenerative.
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Affiliation(s)
- Judith Furth-Lavi
- Department of Endocrinology and Metabolism, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel; Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel; Institute for Drug Research, The School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Ayat Hija
- Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Sharona Tornovsky-Babeay
- Department of Endocrinology and Metabolism, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel; Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Adi Mazouz
- Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Tehila Dahan
- Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Miri Stolovich-Rain
- Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Agnes Klochendler
- Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel
| | - Yuval Dor
- Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel.
| | - Dana Avrahami
- Department of Endocrinology and Metabolism, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel; Department of Developmental Biology and Cancer Research, The Institute for Medical Research Israel-Canada (IMRIC), The Hebrew University-Hadassah Medical School, Jerusalem 91120, Israel.
| | - Benjamin Glaser
- Department of Endocrinology and Metabolism, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem, Israel.
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Takeshita Y, Kita Y, Tanaka T, Goto H, Nakano Y, Teramura C, Enyama Y, Takamura T. Insulin-GLP-1 receptor agonist relay and GLP-1 receptor agonist first regimens in individuals with type 2 diabetes: a randomized, open-label trial study. J Diabetes Investig 2022; 13:965-974. [PMID: 35034428 PMCID: PMC9153847 DOI: 10.1111/jdi.13749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 12/26/2021] [Accepted: 01/11/2022] [Indexed: 11/29/2022] Open
Abstract
Aims/Introduction Glucagon‐like peptide‐1 receptor agonists (GLP‐1 RA) might be less effective in patients with severe hyperglycemia, because hyperglycemia downregulated the GLP‐1 receptor in an animal study. To examine this hypothesis clinically, we compared the glucose‐lowering effects of GLP‐1 receptor agonist liraglutide with and without prior glycemic control. Materials and Methods In an open‐label, parallel trial, participants with poorly controlled type 2 diabetes were recruited and randomized to receive once‐daily insulin therapy, degludec (Insulin–GLP‐1 RA relay group, mean 16.8 ± 11.4 IU/day), for 12 weeks and then liraglutide for 12 weeks or subcutaneous injections of GLP‐1 RA, liraglutide (GLP‐1 RA first group, 0.9 mg), for 24 weeks. The primary efficacy end‐points consisted of changes in the levels of fasting plasma glucose and glycated hemoglobin (HbA1c). Results The median fasting plasma glucose and HbA1c before the study were 210.0 mg/dL and 9.8%, respectively. The levels of fasting plasma glucose and HbA1c significantly decreased in the Insulin–GLP‐1 RA relay group (P < 0.001) and GLP‐1 RA first group (P < 0.001) by week 24, although no intergroup differences were observed. The reduction of HbA1c in the Insulin–GLP‐1 RA relay group tended to be larger than that in the GLP‐1 RA first group in the lowest CPR (C‐peptide immunoreactivity) quartile (P = 0.072). The adverse events consisted of gastrointestinal problems, followed by hypoglycemia. Conclusions The GLP‐1 receptor agonist is overall effective without prior glycemic control with insulin in participants with poorly controlled type 2 diabetes. However, in participants with insulinopenic type 2 diabetes, prior glycemic control with insulin might overcome glucose toxicity‐induced GLP‐1 resistance.
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Affiliation(s)
- Yumie Takeshita
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Yuki Kita
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Takeo Tanaka
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Hisanori Goto
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Yujiro Nakano
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Chisato Teramura
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Yasufumi Enyama
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
| | - Toshinari Takamura
- Department of Endocrinology and Metabolism, Kanazawa University Graduate School of Medical Sciences, 13-1 Takara-machi, Kanazawa, Ishikawa, 920-8640, Japan
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Kaneto H, Kimura T, Shimoda M, Obata A, Sanada J, Fushimi Y, Nakanishi S, Mune T, Kaku K. Favorable Effects of GLP-1 Receptor Agonist against Pancreatic β-Cell Glucose Toxicity and the Development of Arteriosclerosis: "The Earlier, the Better" in Therapy with Incretin-Based Medicine. Int J Mol Sci 2021; 22:7917. [PMID: 34360682 DOI: 10.3390/ijms22157917] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/21/2021] [Accepted: 07/22/2021] [Indexed: 12/16/2022] Open
Abstract
Fundamental pancreatic β-cell function is to produce and secrete insulin in response to blood glucose levels. However, when β-cells are chronically exposed to hyperglycemia in type 2 diabetes mellitus (T2DM), insulin biosynthesis and secretion are decreased together with reduced expression of insulin transcription factors. Glucagon-like peptide-1 (GLP-1) plays a crucial role in pancreatic β-cells; GLP-1 binds to the GLP-1 receptor (GLP-1R) in the β-cell membrane and thereby enhances insulin secretion, suppresses apoptotic cell death and increase proliferation of β-cells. However, GLP-1R expression in β-cells is reduced under diabetic conditions and thus the GLP-1R activator (GLP-1RA) shows more favorable effects on β-cells at an early stage of T2DM compared to an advanced stage. On the other hand, it has been drawing much attention to the idea that GLP-1 signaling is important in arterial cells; GLP-1 increases nitric oxide, which leads to facilitation of vascular relaxation and suppression of arteriosclerosis. However, GLP-1R expression in arterial cells is also reduced under diabetic conditions and thus GLP-1RA shows more protective effects on arteriosclerosis at an early stage of T2DM. Furthermore, it has been reported recently that administration of GLP-1RA leads to the reduction of cardiovascular events in various large-scale clinical trials. Therefore, we think that it would be better to start GLP-1RA at an early stage of T2DM for the prevention of arteriosclerosis and protection of β-cells against glucose toxicity in routine medical care.
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Treml J, Večeřová P, Herczogová P, Šmejkal K. Direct and Indirect Antioxidant Effects of Selected Plant Phenolics in Cell-Based Assays. Molecules 2021; 26:molecules26092534. [PMID: 33926137 PMCID: PMC8123583 DOI: 10.3390/molecules26092534] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 04/21/2021] [Accepted: 04/22/2021] [Indexed: 11/16/2022] Open
Abstract
Background: Oxidative stress is a key factor in the pathophysiology of many diseases. This study aimed to verify the antioxidant activity of selected plant phenolics in cell-based assays and determine their direct or indirect effects. Methods: The cellular antioxidant assay (CAA) assay was employed for direct scavenging assays. In the indirect approach, the influence of each test substance on the gene and protein expression and activity of selected antioxidant enzymes was observed. One assay also dealt with activation of the Nrf2-ARE pathway. The overall effect of each compound was measured using a glucose oxidative stress protection assay. Results: Among the test compounds, acteoside showed the highest direct scavenging activity and no effect on the expression of antioxidant enzymes. It increased only the activity of catalase. Diplacone was less active in direct antioxidant assays but positively affected enzyme expression and catalase activity. Morusin showed no antioxidant activity in the CAA assay. Similarly, pomiferin had only mild antioxidant activity and proved rather cytotoxic. Conclusions: Of the four selected phenolics, only acteoside and diplacone demonstrated antioxidant effects in cell-based assays.
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Affiliation(s)
- Jakub Treml
- Department of Molecular Pharmacy, Faculty of Pharmacy, Masaryk University, Palackeho tr. 1946/1, 612 00 Brno, Czech Republic; (P.V.); (P.H.)
- Correspondence: (J.T.); (K.Š.)
| | - Petra Večeřová
- Department of Molecular Pharmacy, Faculty of Pharmacy, Masaryk University, Palackeho tr. 1946/1, 612 00 Brno, Czech Republic; (P.V.); (P.H.)
| | - Petra Herczogová
- Department of Molecular Pharmacy, Faculty of Pharmacy, Masaryk University, Palackeho tr. 1946/1, 612 00 Brno, Czech Republic; (P.V.); (P.H.)
- Department of Natural Drugs, Faculty of Pharmacy, Masaryk University, Palackeho tr. 1946/1, 612 00 Brno, Czech Republic
| | - Karel Šmejkal
- Department of Natural Drugs, Faculty of Pharmacy, Masaryk University, Palackeho tr. 1946/1, 612 00 Brno, Czech Republic
- Correspondence: (J.T.); (K.Š.)
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Aminzadeh A, Bashiri H. Myricetin ameliorates high glucose-induced endothelial dysfunction in human umbilical vein endothelial cells. Cell Biochem Funct 2019; 38:12-20. [PMID: 31691320 DOI: 10.1002/cbf.3442] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 08/18/2019] [Accepted: 09/02/2019] [Indexed: 12/11/2022]
Abstract
Endothelial dysfunction is recognized as the initial detectable stage of cardiovascular disease, a serious complication of diabetes. In this study, we evaluated effects of myricetin on high glucose (HG)-elicited oxidative damage in human umbilical vein endothelial cells (HUVECs). The cells were pre-incubated with myricetin and then treated with HG to induce apoptosis. The effect of myricetin on viability was investigated by MTT assay. The levels of lipid peroxidation (LPO) were determined by thiobarbituric acid (TBA) method. The protein expression of Bax, Bcl-2 and caspase-3 was measured by western blot analysis. Moreover, the effect of myricetin on total antioxidant capacity (TAC) and total thiol molecules was also determined. Our results showed that myricetin was able to markedly restore the viability of endothelial cells under oxidative stress. Myricetin reduced HG-caused increase in LPO levels. Also, TAC and total thiol molecules were notably elevated by myricetin. Incubation with myricetin decreased the protein expression levels of Bax, whereas it increased the expression levels of the Bcl-2, compared with HG treatment alone. Furthermore, myricetin significantly decreased cleaved caspase-3 protein expression. It is concluded that myricetin may protect HUVECs from oxidative stress induced by HG via increasing cell TAC and reducing Bax/Bcl-2 protein ratio, and caspase-3 expression.
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Affiliation(s)
- Azadeh Aminzadeh
- Department of Pharmacology and Toxicology, School of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran.,Pharmaceutics Research Center, Institute of Neuropharmacology, Kerman University of Medical Sciences, Kerman, Iran
| | - Hamideh Bashiri
- Department of Physiology and Pharmacology, Afzalipour School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
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van Niekerk G, Davis T, Patterton HG, Engelbrecht AM. How Does Inflammation-Induced Hyperglycemia Cause Mitochondrial Dysfunction in Immune Cells? Bioessays 2019; 41:e1800260. [PMID: 30970156 DOI: 10.1002/bies.201800260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 02/26/2019] [Indexed: 12/15/2022]
Abstract
Inflammatory mediators have an established role in inducing insulin resistance and promoting hyperglycemia. In turn, hyperglycemia has been argued to drive immune cell dysfunction as a result of mitochondrial dysfunction. Here, the authors review the evidence challenging this view. First, it is pointed out that inflammatory mediators are known to induce altered mitochondrial function. In this regard, critical care patients suffer both an elevated inflammatory tone as well as hyperglycemia, rendering it difficult to distinguish between the effects of inflammation and hyperglycemia. Second, emerging evidence indicates that a decrease in mitochondrial respiration and an increase in reactive oxygen species (ROS) production are not necessarily manifestations of pathology, but adaptations taking shape as the mitochondria is abdicating its adenosine triphosphate (ATP)-producing function (which is taken over by glycolysis) and instead becomes "retooled" for an immunological role. Collectively, these observations challenge the commonly held belief that acute hyperglycemia induces mitochondrial damage leading to immune cell dysfunction.
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Affiliation(s)
- Gustav van Niekerk
- Department of Physiological Sciences, Stellenbosch University, 7602, Stellenbosch, South Africa
| | - Tanja Davis
- Department of Physiological Sciences, Stellenbosch University, 7602, Stellenbosch, South Africa
| | - Hugh-George Patterton
- Centre for Bioinformatics and Computational Biology, Stellenbosch University, 7602, Stellenbosch, South Africa
| | - Anna-Mart Engelbrecht
- Department of Physiological Sciences, Stellenbosch University, 7602, Stellenbosch, South Africa
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Šušaníková I, Balleková J, Štefek M, Hošek J, Mučaji P. Artichoke leaf extract, as AKR1B1 inhibitor, decreases sorbitol level in the rat eye lenses under high glucose conditions ex vivo. Phytother Res 2018; 32:2389-2395. [PMID: 30109747 DOI: 10.1002/ptr.6174] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 07/12/2018] [Accepted: 07/13/2018] [Indexed: 11/08/2022]
Abstract
In the previous study, the artichoke leaf extract showed effective inhibition of AKR1B1, the first enzyme of polyol pathway, which reduces high level of glucose to osmotically active sorbitol, important for development of chronic diabetic complications. In the present study, the effect of artichoke leaf extract and of several participating phenols (caffeic acid, chlorogenic acid, quinic acid, and luteolin) was tested on sorbitol level in rat lenses exposed to high glucose ex vivo, on cytotoxicity as well as on oxidative stress in C2C12 muscle cell line induced by high glucose in vitro. The concentration of sorbitol was determined by enzymatic analysis, the cytotoxicity was provided by WST-1 test and intracellular content of reactive oxygen species was determined by fluorescence of 2'-7'-dichlorofluorescein probe. The extract and the compounds tested showed significant protection against toxic effects of high concentration of glucose in both models. On balance, the artichoke leaf extract thus represents a prospective preventive agent of development of chronic diabetic complications, probably due to phenols content, concerning preclinical and clinical studies.
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Affiliation(s)
- Ivana Šušaníková
- Department of Pharmacognosy and Botany, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia
| | - Jana Balleková
- Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Milan Štefek
- Institute of Experimental Pharmacology and Toxicology, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Jan Hošek
- Department of Molecular Biology and Pharmaceutical Biotechnology, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno, Brno, Czech Republic
| | - Pavel Mučaji
- Department of Pharmacognosy and Botany, Faculty of Pharmacy, Comenius University, Bratislava, Slovakia
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11
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Iwadate Y, Funabasama N, Kato JI. Involvement of formate dehydrogenases in stationary phase oxidative stress tolerance in Escherichia coli. FEMS Microbiol Lett 2018; 364:4243112. [PMID: 29044403 DOI: 10.1093/femsle/fnx193] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Accepted: 09/11/2017] [Indexed: 01/24/2023] Open
Abstract
Previously, we constructed a series of reduced-genome strains of Escherichia coli by combining large-scale chromosome deletions and then tested the sensitivity of these strains to the redox-cycling drug menadione. In this study, we analyzed a deletion that increased menadione sensitivity and discovered that loss of selenocysteine synthase genes was responsible for the strain's reduced tolerance to oxidative stress. Mutants of formate dehydrogenases, which are selenocysteine-containing enzymes, were also sensitive to menadione, indicating that these enzymes are involved in oxidative stress during stationary phase, specifically under microaerobic conditions in the presence of glucose. Among three formate dehydrogenases encoded by the E. coli genome, two were responsible for the observed phenotypes: formate dehydrogenase-H and -O. In a mutant of fdhD, which encodes a sulfur transferase that is essential for formate dehydrogenase activity, formate dehydrogenase-O could still contribute to oxidative stress tolerance, revealing a novel role for this protein. Consistent with this, overproduction of the electron transfer subunits of this enzyme, FdoH and FdoI, increased menadione tolerance and supported survival in stationary phase. These results suggested that formate dehydrogenase-O serves as an electron transfer element in glucose metabolism to promote oxidative stress tolerance and survival in stationary phase.
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Affiliation(s)
- Yumi Iwadate
- Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
| | - Noriyuki Funabasama
- Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
| | - Jun-Ichi Kato
- Department of Biological Sciences, Graduate School of Science and Engineering, Tokyo Metropolitan University, 1-1 Minamiohsawa, Hachioji, Tokyo 192-0397, Japan
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Liu M, Lu W, Hou Q, Wang B, Sheng Y, Wu Q, Li B, Liu X, Zhang X, Li A, Zhang H, Xiu R. Gene expression profiles of glucose toxicity-exposed islet microvascular endothelial cells. Microcirculation 2018; 25:e12450. [PMID: 29575333 DOI: 10.1111/micc.12450] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 03/10/2018] [Indexed: 12/17/2022]
Abstract
OBJECTIVE Islet microcirculation is mainly composed by IMECs. The aim of the study was to investigate the differences in gene expression profiles of IMECs upon glucose toxicity exposure and insulin treatment. METHODS IMECs were treated with 5.6 mmol L-1 glucose, 35 mmol L-1 glucose, and 35 mmol L-1 glucose plus 10-8 mol L-1 insulin, respectively. Gene expression profiles were determined by microarray and verified by qPCR. GO terms and KEGG analysis were performed to assess the potential roles of differentially expressed genes. The interaction and expression tendency of differentially expressed genes were analyzed by Path-Net algorithm. RESULTS Compared with glucose toxicity-exposed IMECs, 1574 mRNAs in control group and 2870 mRNAs in insulin-treated IMECs were identified with differential expression, respectively. GO and KEGG pathway analysis revealed that these genes conferred roles in regulation of apoptosis, proliferation, migration, adhesion, and metabolic process etc. Additionally, MAPK signaling pathway and apoptosis were the dominant nodes in Path-Net. IMECs survival and function pathways were significantly changed, and the expression tendency of genes from euglycemia and glucose toxicity exposure to insulin treatment was revealed and enriched in 7 patterns. CONCLUSIONS Our study provides a microcirculatory framework for gene expression profiles of glucose toxicity-exposed IMECs.
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Affiliation(s)
- Mingming Liu
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Wenbao Lu
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | | | - Bing Wang
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Youming Sheng
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Qingbin Wu
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Bingwei Li
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Xueting Liu
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Xiaoyan Zhang
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Ailing Li
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Honggang Zhang
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Ruijuan Xiu
- Institute of Microcirculation, Key Laboratory of Microcirculation, Ministry of Health, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
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13
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Rodriguez-Araujo G, Nakagami H. Pathophysiology of cardiovascular disease in diabetes mellitus. Cardiovasc Endocrinol Metab 2018; 7:4-9. [PMID: 31646271 DOI: 10.1097/XCE.0000000000000141] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Accepted: 11/22/2017] [Indexed: 01/12/2023]
Abstract
Diabetes mellitus elicits cellular, epigenetic, and post-translational changes that directly or indirectly affect the biology of the vasculature and other metabolic systems resulting in the apparition of cardiovascular disease. In this review, we provide a current perspective on the most recent discoveries in this field, with particular focus on hyperglycemia- induced pathology in the cardiovascular system. We also provide perspective on the clinical importance of molecular targeting of cardiovascular and diabetes mellitus therapies to treat hyperglycemia, inflammation, thrombosis, dyslipidemia, atherosclerosis, and hypertension.
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14
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Jurczak MJ, Saini S, Ioja S, Costa DK, Udeh N, Zhao X, Whaley JM, Kibbey RG. SGLT2 knockout prevents hyperglycemia and is associated with reduced pancreatic β-cell death in genetically obese mice. Islets 2018; 10:181-189. [PMID: 30118626 PMCID: PMC6284495 DOI: 10.1080/19382014.2018.1503027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Inhibition of the sodium-glucose co-transporter type 2 (SGLT2) has received growing acceptance as a novel, safe and effective means to improve glycemic control in patients with type 2 diabetes. Inhibition of SGLT2 lowers the renal glucose threshold and reduces plasma glucose by promoting glucose excretion in urine. Both animal studies and clinical trials in man suggest that SGLT2 inhibition has the potential to improve pancreatic β-cell function by reducing glucose toxicity. However, there is limited data exploring how reducing glucotoxicity via SGLT2 inhibition affects rates of β-cell proliferation and death throughout life in the context of insulin resistance and type 2 diabetes. SGLT2-/- mice were backcrossed to the db/db strain to produce littermate control db/db-SGLT2+/+ and experimental db/db-SGLT2-/- mice. Mice were euthanized at 5, 12 and 20 weeks of age to collect plasma for glucose, insulin, lipid and cytokine measures, and pancreata for histological analysis including determination of β-cell mass and rates of proliferation and death. SGLT2 deletion in db/db mice reduced plasma glucose as early as 5 weeks of age and continued throughout life without changes in plasma lipids or cytokines. Reduced plasma glucose levels occurred in parallel with an increase in the relative β-cell volume and reduced frequency of β-cell death, and no apparent change in rates of β-cell proliferation. These data add to a growing body of evidence demonstrating that improved glycemic control achieved through SGLT2 inhibition can preserve β-cell function and endogenous insulin secretion by reducing glucose toxicity and rates of β-cell death.
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Affiliation(s)
- Michael J. Jurczak
- Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Saumya Saini
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Simona Ioja
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Diana K. Costa
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Nnamdi Udeh
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Xiaojian Zhao
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Jean M. Whaley
- Metabolic Diseases Biology, Bristol-Myers Squibb Research and Development, Princeton, NJ, USA
| | - Richard G. Kibbey
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
- Departments of Cellular & Molecular Physiology, Yale University School of Medicine, New Haven, CT, USA
- CONTACT Richard G. Kibbey Internal Medicine-Endocrinology, Yale University School of Medicine, TAC S269, P.O. Box 9812, New Haven, CT 06536-8012; Michael J. Jurczak Department of Medicine, Division of Endocrinology and Metabolism, University of Pittsburgh School of Medicine, 200 Lothrop Street, BST W1060, Pittsburgh, PA 15261
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15
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Jiang M, Zhang H, Zhai L, Ye B, Cheng Y, Zhai C. ALA/LA ameliorates glucose toxicity on HK-2 cells by attenuating oxidative stress and apoptosis through the ROS/p38/TGF-β 1 pathway. Lipids Health Dis 2017; 16:216. [PMID: 29145851 PMCID: PMC5691398 DOI: 10.1186/s12944-017-0611-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 11/06/2017] [Indexed: 12/27/2022] Open
Abstract
Background Growing evidence indicates that oxidative stress (OS) plays a pivotal role in Diabetic nephropathy (DN). In a previous study we demonstrated that ALA/LA protected HK-2 cells against high glucose-induced cytotoxicity. So we aimed to establish the glucose injury model of HK-2 cells and investigate the beneficial effects of ALA/LA on high glucose-induced excessive production of TGF-β1 and the possible mechanisms mediating the effects. Methods The expression of OS markers in high glucose-induced HK-2 cells treated with ALA/LA., including the antioxidant enzymes and reactive oxygen species (ROS) production, as well as the apoptosis rate were assayed by ELISA and flow cytometry. The p38/transforming growth factor β1 (TGF-β1) signal pathway were measured by real-time RT-PCR and western blot. Results The modeling condition of glucose toxicity on HK-2 cells was at the glucose concentration of 40.9 mM. ALA/LA can significantly increase the activities of antioxidant enzymes and decrease ROS production stimulated by high glucose. The study also found that ALA/LA caused a decrease in the apoptosis rate and TGF-β1 level of HK-2 cells under high glucose stress through the ROS/p38 pathway. Conclusions ALA/LA exerts protective effects in vitro through inhibition of ROS generation, down regulation of the activation of the p38MAPK pathway and the expression of TGF-β1 in HK-2 cells.
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Affiliation(s)
- Mingxia Jiang
- School of Public Health, Southeast University, Nanjing, 210009, China.,Jinling Hospital, Nanjing, 210002, China
| | - Haifen Zhang
- School of Public Health, Southeast University, Nanjing, 210009, China.,School of Tourism and Culinary Science, Yangzhou University, Yangzhou, 225127, China
| | - Lijie Zhai
- Department of Neurological Surgery, Northwestern University - Feinberg School of Medicine, Chicago, IL, 60612, USA
| | - Bianliang Ye
- School of Public Health, Southeast University, Nanjing, 210009, China
| | - Yin Cheng
- School of Public Health, Southeast University, Nanjing, 210009, China
| | - Chengkai Zhai
- School of Public Health, Southeast University, Nanjing, 210009, China.
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Ladage ML, King SD, Burks DJ, Quan DL, Garcia AM, Azad RK, Padilla PA. Glucose or Altered Ceramide Biosynthesis Mediate Oxygen Deprivation Sensitivity Through Novel Pathways Revealed by Transcriptome Analysis in Caenorhabditis elegans. G3 (Bethesda) 2016; 6:3149-60. [PMID: 27507791 DOI: 10.1534/g3.116.031583] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Individuals with type 2 diabetes display metabolic abnormalities, such as hyperglycemia, increased free fatty acids, insulin resistance, and altered ceramide levels, that contribute to vascular dysfunctions and compromised oxygen delivery. Caenorhabditis elegans fed a glucose-supplemented diet or with altered ceramide metabolism, due to a hyl-2 mutation, are sensitive to oxygen deprivation (anoxia). Our experiments showed that the combination of these factors further decreased the anoxia survival. RNA-sequencing analysis was performed to assess how a glucose-supplemented diet and/or a hyl-2 mutation altered the transcriptome. Comparison analysis of transcripts associated with anoxia-sensitive animals [hyl-2(tm2031) mutation or a glucose diet] revealed 199 common transcripts encoded by genes with known or predicted functions involving innate immunity, cuticle function (collagens), or xenobiotic and endobiotic phase I and II detoxification system. Use of RNA interference (RNAi) to target gene products of the xenobiotic and endobiotic phase I and II detoxification system (UDP-glycosyltransferase and Cytochrome p450 genes; ugt-15, ugt-18, ugt-19, ugt-41, ugt-63, cyp-13A12, cyp-25A1, and cyp-33C8) increased anoxia survival in wild-type animals fed a standard diet. Anoxia sensitivity of the hyl-2(tm2031) animals was suppressed by RNAi of cyp-25A1 or cyp-33C8 genes. A glucose diet fed to the P0 hermaphrodite decreased the anoxia survival of its F1 embryos; however, the RNAi of ugt-63 and cyp-33C8 suppressed anoxia sensitivity. These studies provide evidence that the detoxification system impacts oxygen deprivation responses and that C. elegans can be used to model the conserved detoxification system.
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Diaz-Juarez J, Suarez J, Cividini F, Scott BT, Diemer T, Dai A, Dillmann WH. Expression of the mitochondrial calcium uniporter in cardiac myocytes improves impaired mitochondrial calcium handling and metabolism in simulated hyperglycemia. Am J Physiol Cell Physiol 2016; 311:C1005-C1013. [PMID: 27681178 DOI: 10.1152/ajpcell.00236.2016] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Accepted: 09/23/2016] [Indexed: 12/21/2022]
Abstract
Diabetic cardiomyopathy is associated with metabolic changes, including decreased glucose oxidation (Gox) and increased fatty acid oxidation (FAox), which result in cardiac energetic deficiency. Diabetic hyperglycemia is a pathophysiological mechanism that triggers multiple maladaptive phenomena. The mitochondrial Ca2+ uniporter (MCU) is the channel responsible for Ca2+ uptake in mitochondria, and free mitochondrial Ca2+ concentration ([Ca2+]m) regulates mitochondrial metabolism. Experiments with cardiac myocytes (CM) exposed to simulated hyperglycemia revealed reduced [Ca2+]m and MCU protein levels. Therefore, we investigated whether returning [Ca2+]m to normal levels in CM by MCU expression could lead to normalization of Gox and FAox with no detrimental effects. Mouse neonatal CM were exposed for 72 h to normal glucose [5.5 mM glucose + 19.5 mM mannitol (NG)], high glucose [25 mM glucose (HG)], or HG + adenoviral MCU expression. Gox and FAox, [Ca2+]m, MCU levels, pyruvate dehydrogenase (PDH) activity, oxidative stress, mitochondrial membrane potential, and apoptosis were assessed. [Ca2+]m and MCU protein levels were reduced after 72 h of HG. Gox was decreased and FAox was increased in HG, PDH activity was decreased, phosphorylated PDH levels were increased, and mitochondrial membrane potential was reduced. MCU expression returned these parameters toward NG levels. Moreover, increased oxidative stress and apoptosis were reduced in HG by MCU expression. We also observed reduced MCU protein levels and [Ca2+]m in hearts from type 1 diabetic mice. Thus we conclude that HG-induced metabolic alterations can be reversed by restoration of MCU levels, resulting in return of [Ca2+]m to normal levels.
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Affiliation(s)
- Julieta Diaz-Juarez
- Department of Medicine, University of California, San Diego, La Jolla, California; and.,Department of Pharmacology, Instituto Nacional de Cardiología Ignacio Chávez, Tlalpan, México, Mexico
| | - Jorge Suarez
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Federico Cividini
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Brian T Scott
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Tanja Diemer
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Anzhi Dai
- Department of Medicine, University of California, San Diego, La Jolla, California; and
| | - Wolfgang H Dillmann
- Department of Medicine, University of California, San Diego, La Jolla, California; and
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18
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Hwang IH, Park J, Kim JM, Kim SI, Choi JS, Lee KB, Yun SH, Lee MG, Park SJ, Jang IS. Tetraspanin-2 promotes glucotoxic apoptosis by regulating the JNK/β-catenin signaling pathway in human pancreatic β cells. FASEB J 2016; 30:3107-16. [PMID: 27247127 PMCID: PMC5001516 DOI: 10.1096/fj.201600240rr] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Accepted: 05/19/2016] [Indexed: 12/02/2022]
Abstract
Diabetes mellitus is a complex and heterogeneous disease, which has β-cell
dysfunction at its core. Glucotoxicity affects pancreatic islets, causing
β-cell apoptosis. However, the role of JNK/β-catenin signaling in
glucotoxic β-cell apoptosis is not well understood. Recently, we identified
tetraspanin-2 (TSPAN2) protein as a proapoptotic β-cell factor induced by
glucose, suggesting that TSPAN2 might contribute to pancreatic β-cell
glucotoxicity. To investigate the effects of glucose concentration on TSPAN2
expression and apoptosis, we used reverted immortalized RNAKT-15 human pancreatic
β cells. High TSPAN2 levels up-regulated phosphorylated (p) JNK and induced
apoptosis. p-JNK enhanced the phosphorylation of β-catenin and Dickkopf-1
(Dkk1). Dkk1 knockdown by small interfering (si)RNA up-regulated nuclear
β-catenin, suggesting that it is a JNK/β-catenin-dependent pathway.
siRNA-mediated TSPAN2 depletion in RNAKT-15 cells increased nuclear β-catenin.
This decreased BCL2-associated X protein (Bax) activation, leading to marked
protection against high glucose–induced apoptosis. Bax subfamily proteins
induced apoptosis through caspase-3. Thus, TSPAN2 might have induced Bax
translocation and caspase-3 activation in pancreatic β cells, thereby
promoting the apoptosis of RNAKT-15 cells by regulating the JNK/β-catenin
pathway in response to high glucose concentrations. Targeting TSPAN2 could be a
potential therapeutic strategy to treat glucose toxicity-induced β-cell
failure.—Hwang, I.-H., Park, J., Kim, J. M., Kim, S. I., Choi, J.-S., Lee,
K.-B., Yun, S. H., Lee, M.-G., Park, S. J., Jang, I.-S. Tetraspanin-2 promotes
glucotoxic apoptosis by regulating the JNK/β-catenin signaling pathway in
human pancreatic β cells.
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Affiliation(s)
- In-Hu Hwang
- Department of Physiology, Korea University College of Medicine, Seoul, Korea
| | - Junsoo Park
- Division of Biological Science and Technology, Yonsei University, Wonju, Korea
| | - Jung Min Kim
- NAR Center, Inc., Daejeon Oriental Hospital of Daejeon University, Daejeon, Korea
| | - Seung Il Kim
- Division of Bioconvergence, Korea Basic Science Institute, Daejeon, Korea; and
| | - Jong-Soon Choi
- Division of Bioconvergence, Korea Basic Science Institute, Daejeon, Korea; and
| | - Kyung-Bok Lee
- Division of Bioconvergence, Korea Basic Science Institute, Daejeon, Korea; and
| | - Sung Ho Yun
- Division of Bioconvergence, Korea Basic Science Institute, Daejeon, Korea; and
| | - Min-Goo Lee
- Department of Physiology, Korea University College of Medicine, Seoul, Korea
| | - Soo Jung Park
- Sangji University College of Korean Medicine, Wonju, Korea
| | - Ik-Soon Jang
- Division of Bioconvergence, Korea Basic Science Institute, Daejeon, Korea; and
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Kaneto H, Matsuoka TA, Kimura T, Obata A, Shimoda M, Kamei S, Mune T, Kaku K. Appropriate therapy for type 2 diabetes mellitus in view of pancreatic β-cell glucose toxicity: "the earlier, the better". J Diabetes 2016. [PMID: 26223490 DOI: 10.1111/1753-0407.12331] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Pancreatic β-cells secrete insulin when blood glucose levels become high; however, when β-cells are chronically exposed to hyperglycemia, β-cell function gradually deteriorates, which is known as β-cell glucose toxicity. In the diabetic state, nuclear expression of the pancreatic transcription factors pancreatic and duodenal homeobox 1 (PDX-1) and v-Maf musculoaponeurotic fibrosarcoma oncogene family, protein A (MafA) is decreased. In addition, incretin receptor expression in β-cells is decreased, which is likely involved in the impairment of incretin effects in diabetes. Clinically, it is important to select appropriate therapy for type 2 diabetes mellitus (T2DM) so that β-cell function can be preserved. In addition, when appropriate pharmacological interventions against β-cell glucose toxicity are started at the early stages of diabetes, β-cell function is substantially restored, which is not observed if treatment is started at advanced stages. These observations indicate that it is likely that downregulation of pancreatic transcription factors and/or incretin receptors is involved in β-cell dysfunction observed in T2DM and it is very important to start appropriate pharmacological intervention against β-cell glucose toxicity in the early stages of diabetes.
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Affiliation(s)
- Hideaki Kaneto
- Department of Diabetes, Endocrinology and Metabolism, Kawasaki Medical School, Kurashiki
| | - Taka-Aki Matsuoka
- Department of Metabolic Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tomohiko Kimura
- Department of Diabetes, Endocrinology and Metabolism, Kawasaki Medical School, Kurashiki
| | - Atsushi Obata
- Department of Diabetes, Endocrinology and Metabolism, Kawasaki Medical School, Kurashiki
| | - Masashi Shimoda
- Department of Diabetes, Endocrinology and Metabolism, Kawasaki Medical School, Kurashiki
| | - Shinji Kamei
- Department of Diabetes, Endocrinology and Metabolism, Kawasaki Medical School, Kurashiki
| | - Tomoatsu Mune
- Department of Diabetes, Endocrinology and Metabolism, Kawasaki Medical School, Kurashiki
| | - Kohei Kaku
- Department of Diabetes, Endocrinology and Metabolism, Kawasaki Medical School, Kurashiki
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20
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Heng XP, Yang LQ, Chen ML, Li L, Huang SP, Lei Y. Paradox of using intensive lowering of blood glucose in diabetics and strategies to overcome it and decrease cardiovascular risks. Chin J Integr Med 2015; 21:791-800. [PMID: 26525551 DOI: 10.1007/s11655-015-0780-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Indexed: 02/06/2023]
Abstract
Hyperglycemia significantly increases the risk of cardiovascular disease (CVD) in diabetics. However, it has been shown by a series of large scale international studies that intensive lowering of blood glucose levels not only has very limited benefits against cardiovascular problems in patients, but may even be harmful to patients at a high risk for CVD and/or poor long-term control of blood glucose levels. Therefore, Western medicine is faced with a paradox. One way to solve this may be administration of Chinese herbal medicines that not only regulate blood glucose, blood fat levels and blood pressure, but also act on multiple targets. These medicines can eliminate cytotoxicity of high glucose through anti-inflammatory and anti-oxidant methods, regulation of cytokines and multiple signaling molecules, and maintenance of cell vitality and the cell cycle, etc. This allows hyperglycemic conditions to exist in a healthy manner, which is called "harmless hyperglycemia" Furthermore, these cardiovascular benefits go beyond lowering blood glucose levels. The mechanisms of action not only avoid cardiovascular injury caused by intensive lowering of blood glucose levels, but also decrease the cardiovascular dangers posed by hyperglycemia.
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Affiliation(s)
- Xian-pei Heng
- Department of Endocrinology, Peoples Hospital Affiliated to Fujian University of Traditional Chinese Medicine, Peoples Hospital of Fujian Province, Fuzhou, 350004, China.
| | - Liu-qing Yang
- Department of Endocrinology, Peoples Hospital Affiliated to Fujian University of Traditional Chinese Medicine, Peoples Hospital of Fujian Province, Fuzhou, 350004, China
| | - Min-ling Chen
- Department of Endocrinology, Peoples Hospital Affiliated to Fujian University of Traditional Chinese Medicine, Peoples Hospital of Fujian Province, Fuzhou, 350004, China
| | - Liang Li
- Department of Endocrinology, Peoples Hospital Affiliated to Fujian University of Traditional Chinese Medicine, Peoples Hospital of Fujian Province, Fuzhou, 350004, China
| | - Su-ping Huang
- Academy of Integrative Medicine Fujian China, Fuzhou, 350122, China
| | - Ying Lei
- Fujian University of Traditional Chinese Medicine, Fuzhou, 350122, China
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Liistro T, Guiducci L, Burchielli S, Panetta D, Belcari N, Pardini S, Del Guerra A, Salvadori PA, Iozzo P. Brain glucose overexposure and lack of acute metabolic flexibility in obesity and type 2 diabetes: a PET-[18F]FDG study in Zucker and ZDF rats. J Cereb Blood Flow Metab 2010; 30:895-9. [PMID: 20179723 DOI: 10.1038/jcbfm.2010.27] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Brain glucose exposure may complicate diabetes and obesity. We used positron emission tomography with (18)F-fluorodeoxyglucose in Zucker obese, diabetic, and control rats to determine the contributions of blood glucose mass action versus local mechanisms in regulating central glucose disposal in fasted and acutely glucose-stimulated states, and their adaptations in obesity and diabetes. Our study data indicate that brain glucose uptake is dependent on both local and mass action components, and is stimulated by acute glucose intake in healthy rats. In diseased animals, the organ was chronically overexposed to glucose, due to high fasting glucose uptake, almost abolishing the physiologic response to glucose loading.
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Liu J, Wu X, Franklin JL, Messina JL, Hill HS, Moellering DR, Walton RG, Martin M, Garvey WT. Mammalian Tribbles homolog 3 impairs insulin action in skeletal muscle: role in glucose-induced insulin resistance. Am J Physiol Endocrinol Metab 2010; 298:E565-76. [PMID: 19996382 PMCID: PMC2838520 DOI: 10.1152/ajpendo.00467.2009] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Tribbles homolog 3 (TRIB3) was found to inhibit insulin-stimulated Akt phosphorylation and modulate gluconeogenesis in rodent liver. Currently, we examined a role for TRIB3 in skeletal muscle insulin resistance. Ten insulin-sensitive, ten insulin-resistant, and ten untreated type 2 diabetic (T2DM) patients were metabolically characterized by hyperinsulinemic euglycemic glucose clamps, and biopsies of vastus lateralis were obtained. Skeletal muscle samples were also collected from rodent models including streptozotocin (STZ)-induced diabetic rats, db/db mice, and Zucker fatty rats. Finally, L6 muscle cells were used to examine regulation of TRIB3 by glucose, and stable cell lines hyperexpressing TRIB3 were generated to identify mechanisms underlying TRIB3-induced insulin resistance. We found that 1) skeletal muscle TRIB3 protein levels are significantly elevated in T2DM patients; 2) muscle TRIB3 protein content is inversely correlated with glucose disposal rates and positively correlated with fasting glucose; 3) skeletal muscle TRIB3 protein levels are increased in STZ-diabetic rats, db/db mice, and Zucker fatty rats; 4) stable TRIB3 hyperexpression in muscle cells blocks insulin-stimulated glucose transport and glucose transporter 4 (GLUT4) translocation and impairs phosphorylation of Akt, ERK, and insulin receptor substrate-1 in insulin signal transduction; and 5) TRIB3 mRNA and protein levels are increased by high glucose concentrations, as well as by glucose deprivation in muscle cells. These data identify TRIB3 induction as a novel molecular mechanism in human insulin resistance and diabetes. TRIB3 acts as a nutrient sensor and could mediate the component of insulin resistance attributable to hyperglycemia (i.e., glucose toxicity) in diabetes.
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Affiliation(s)
- Jiarong Liu
- Dept. of Nutrition Sciences, Univ. of Alabama at Birmingham, 35294-3360, USA
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Hanazaki K, Maeda H, Okabayashi T. Relationship between perioperative glycemic control and postoperative infections. World J Gastroenterol 2009; 15:4122-5. [PMID: 19725144 PMCID: PMC2738806 DOI: 10.3748/wjg.15.4122] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2009] [Revised: 05/21/2009] [Accepted: 05/28/2009] [Indexed: 02/07/2023] Open
Abstract
Perioperative hyperglycemia in critically ill surgery patients increases the risk of postoperative infection (POI), which is a common, and often costly, surgical complication. Hyperglycemia is associated with abnormalities in leukocyte function, including granulocyte adherence, impaired phagocytosis, delayed chemotaxis, and depressed bactericidal capacity. These leukocyte deficiencies are the cause of infection and improve with tight glycemic control, which leads to fewer POIs in critically ill surgical patients. Tight glycemic control, such as intensive insulin therapy, has a risk of hypoglycemia. In addition, the optimal targeted blood glucose range to reduce POI remains unknown. Since 2006, we have investigated tight perioperative blood glucose control using a closed-loop artificial endocrine pancreas system, to reduce POI and to avoid hypoglycemia. In this Topic Highlight, we review the relationship between perioperative glycemic control and POI, including the use of the artificial pancreas.
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Won KC, Moon JS, Eun MJ, Yoon JS, Chun KA, Cho IH, Kim YW, Lee HW. A protective role for heme oxygenase-1 in INS-1 cells and rat islets that are exposed to high glucose conditions. J Korean Med Sci 2006; 21:418-24. [PMID: 16778382 PMCID: PMC2729944 DOI: 10.3346/jkms.2006.21.3.418] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Heme oxygenase-1 (HO-1) has been described as an inducible protein that is capable of cytoprotection via radical scavenging and the prevention of apoptosis. Chronic exposure to hyperglycemia can lead to cellular dysfunction that may become irreversible over time, and this process has been termed glucose toxicity. Yet little is known about the relation between glucose toxicity and HO-1 in the islets. The purposes of the present study were to determine whether prolonged exposure of pancreatic islets to a supraphysiologic glucose concentration disrupts the intracellular balance between reactive oxygen species (ROS) and HO-1, and so this causes defective insulin secretion; we also wanted to evaluate a protective role for HO-1 in pancreatic islets against high glucose levels. The intracellular peroxide levels of the pancreatic islets (INS-1 cell, rat islet) were increased in the high glucose media (30 mM glucose or 50 mM ribose). The HO-1 expression was induced in the INS-1 cells by the high glucose levels. Both the HO-1 expression and glucose stimulated insulin secretion (GSIS) was decreased simultaneously in the islets by treatment of the HO-1 antisense. The HO-1 was upregulated in the INS-1 cells by hemin, an inducer of HO-1. And, HO-1 upregulation induced by hemin reversed the GSIS in the islets at a high glucose condition. These results suggest HO-1 seems to mediate the protective response of pancreatic islets against the oxidative stress that is due to high glucose conditions.
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Affiliation(s)
- Kyu Chang Won
- Department of Internal Medicine, College of Medicine, Yeungnam University, Daegu, Korea.
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