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Oliveira S, Monteiro-Alfredo T, Henriques R, Ribeiro CF, Seiça R, Cruz T, Cabral C, Fernandes R, Piedade F, Robalo MP, Matafome P, Silva S. Improvement of Glycaemia and Endothelial Function by a New Low-Dose Curcuminoid in an Animal Model of Type 2 Diabetes. Int J Mol Sci 2022; 23:ijms23105652. [PMID: 35628465 PMCID: PMC9144453 DOI: 10.3390/ijms23105652] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 05/12/2022] [Accepted: 05/16/2022] [Indexed: 11/16/2022] Open
Abstract
Curcumin has been suggested as a promising treatment for metabolic diseases, but the high doses required limit its therapeutic use. In this study, a new curcuminoid is synthesised to increase curcumin anti-inflammatory and antioxidant potential and to achieve hypoglycaemic and protective vascular effects in type 2 diabetic rats in a lower dose. In vitro, the anti-inflammatory effect was determined through the Griess reaction, and the antioxidant activity through ABTS and TBARS assays. In vivo, Goto-Kakizaki rats were treated for 2 weeks with the equimolar dose of curcumin (40 mg/kg/day) or curcuminoid (52.4 mg/kg/day). Fasting glycaemia, insulin tolerance, plasma insulin, insulin signalling, serum FFA, endothelial function and several markers of oxidative stress were evaluated. Both compounds presented a significant anti-inflammatory effect. Moreover, the curcuminoid had a marked hypoglycaemic effect, accompanied by higher GLUT4 levels in adipose tissue. Both compounds increased NO-dependent vasorelaxation, but only the curcuminoid exacerbated the response to ascorbic acid, consistent with a higher decrease in vascular oxidative and nitrosative stress. SOD1 and GLO1 levels were increased in EAT and heart, respectively. Altogether, these data suggest that the curcuminoid developed here has more pronounced effects than curcumin in low doses, improving the oxidative stress, endothelial function and glycaemic profile in type 2 diabetes.
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Affiliation(s)
- Sara Oliveira
- Coimbra Institute of Clinical and Biomedical Research (iCBR), Faculty of Medicine and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, 3000-548 Coimbra, Portugal; (S.O.); (T.M.-A.); (C.C.); (R.F.); (S.S.)
- Institute of Physiology, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal;
- Clinical-Academic Center of Coimbra (CACC), University of Coimbra, 3000-548 Coimbra, Portugal;
| | - Tamaeh Monteiro-Alfredo
- Coimbra Institute of Clinical and Biomedical Research (iCBR), Faculty of Medicine and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, 3000-548 Coimbra, Portugal; (S.O.); (T.M.-A.); (C.C.); (R.F.); (S.S.)
- Institute of Physiology, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal;
- Clinical-Academic Center of Coimbra (CACC), University of Coimbra, 3000-548 Coimbra, Portugal;
- Research Group on Biotechnology and Bioprospecting Applied to Metabolism (GEBBAM), Federal University of Grande Dourados, Dourados 79825-070, MS, Brazil
| | - Rita Henriques
- Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal; (R.H.); (T.C.)
| | - Carlos Fontes Ribeiro
- Clinical-Academic Center of Coimbra (CACC), University of Coimbra, 3000-548 Coimbra, Portugal;
- Institute of Pharmacology and Experimental Therapeutics, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal
| | - Raquel Seiça
- Institute of Physiology, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal;
- Clinical-Academic Center of Coimbra (CACC), University of Coimbra, 3000-548 Coimbra, Portugal;
| | - Teresa Cruz
- Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal; (R.H.); (T.C.)
- CNC—Center for Neuroscience and Cell Biology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Célia Cabral
- Coimbra Institute of Clinical and Biomedical Research (iCBR), Faculty of Medicine and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, 3000-548 Coimbra, Portugal; (S.O.); (T.M.-A.); (C.C.); (R.F.); (S.S.)
- Clinical-Academic Center of Coimbra (CACC), University of Coimbra, 3000-548 Coimbra, Portugal;
| | - Rosa Fernandes
- Coimbra Institute of Clinical and Biomedical Research (iCBR), Faculty of Medicine and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, 3000-548 Coimbra, Portugal; (S.O.); (T.M.-A.); (C.C.); (R.F.); (S.S.)
- Clinical-Academic Center of Coimbra (CACC), University of Coimbra, 3000-548 Coimbra, Portugal;
| | - Fátima Piedade
- CQE, Complexo I, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal; (F.P.); (M.P.R.)
- Faculty of Sciences, University of Lisbon, 1749-016 Lisbon, Portugal
| | - Maria Paula Robalo
- CQE, Complexo I, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, Portugal; (F.P.); (M.P.R.)
- Instituto Superior de Engenharia de Lisboa (ISEL), Instituto Politécnico de Lisboa, 1959-007 Lisbon, Portugal
| | - Paulo Matafome
- Coimbra Institute of Clinical and Biomedical Research (iCBR), Faculty of Medicine and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, 3000-548 Coimbra, Portugal; (S.O.); (T.M.-A.); (C.C.); (R.F.); (S.S.)
- Institute of Physiology, Faculty of Medicine, University of Coimbra, 3000-548 Coimbra, Portugal;
- Clinical-Academic Center of Coimbra (CACC), University of Coimbra, 3000-548 Coimbra, Portugal;
- Instituto Politécnico de Coimbra, Coimbra Health School (ESTeSC), 3046-854 Coimbra, Portugal
- Correspondence:
| | - Sónia Silva
- Coimbra Institute of Clinical and Biomedical Research (iCBR), Faculty of Medicine and Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, 3000-548 Coimbra, Portugal; (S.O.); (T.M.-A.); (C.C.); (R.F.); (S.S.)
- Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal; (R.H.); (T.C.)
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2
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Curcumin derivatives for Type 2 Diabetes management and prevention of complications. Arch Pharm Res 2020; 43:567-581. [PMID: 32557163 DOI: 10.1007/s12272-020-01240-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 06/09/2020] [Indexed: 02/08/2023]
Abstract
Type 2 diabetes Mellitus (T2DM) is characterized by chronically increased blood glucose levels, which is associated with impairment of the inflammatory and oxidative state and dyslipidaemia. Although it is considered a world heath concern and one of the most studied diseases, we are still pursuing an effective therapy for both the pathophysiological mechanisms and the complications. Curcumin, a natural compound found in the rhizome of Curcuma longa, is well known for its numerous biological activities, as demonstrated by several studies supporting that curcumin possesses hypoglycaemic, hypolipidemic, anti-inflammatory and antioxidant properties, among others. These effects have been explored to the attenuation of hyperglycaemia and progression of DM complications, being appointed as a potential therapeutic approach. Besides its strong intrinsic activity, the polyphenol has low bioavailability, compromising its therapeutic efficacy. In order to overcome this limitation, several chemical strategies have been applied to curcumin, such as drug delivery systems, chemical manipulation and the use of adjuvant therapies. Given the promising results obtained with curcumin derivative, in this review we discuss not only the therapeutic targets of curcumin, but also its most recently developed analogues and their efficacy in the management of T2DM pathophysiology and complications.
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Maller SM, Cagnoni AJ, Bannoud N, Sigaut L, Pérez Sáez JM, Pietrasanta LI, Yang RY, Liu FT, Croci DO, Di Lella S, Sundblad V, Rabinovich GA, Mariño KV. An adipose tissue galectin controls endothelial cell function via preferential recognition of 3-fucosylated glycans. FASEB J 2019; 34:735-753. [PMID: 31914594 DOI: 10.1096/fj.201901817r] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/08/2019] [Accepted: 10/21/2019] [Indexed: 12/21/2022]
Abstract
Upon overnutrition, adipocytes activate a homeostatic program to adjust anabolic pressure. An inflammatory response enables adipose tissue (AT) expansion with concomitant enlargement of its capillary network, and reduces energy storage by increasing insulin resistance. Galectin-12 (Gal-12), an endogenous lectin preferentially expressed in AT, plays a key role in adipocyte differentiation, lipolysis, and glucose homeostasis. Here, we reveal biochemical and biophysical determinants of Gal-12 structure, including its preferential recognition of 3-fucosylated structures, a unique feature among members of the galectin family. Furthermore, we identify a previously unanticipated role for this lectin in the regulation of angiogenesis within AT. Gal-12 showed preferential localization within the inner side of lipid droplets, and its expression was upregulated under hypoxic conditions. Through glycosylation-dependent binding to endothelial cells, Gal-12 promoted in vitro angiogenesis. Moreover, analysis of in vivo AT vasculature showed reduced vascular networks in Gal-12-deficient (Lgals12-/-) compared to wild-type mice, supporting a role for this lectin in AT angiogenesis. In conclusion, this study unveils biochemical, topological, and functional features of a hypoxia-regulated galectin in AT, which modulates endothelial cell function through recognition of 3-fucosylated glycans. Thus, glycosylation-dependent programs may control AT homeostasis by modulating endothelial cell biology with critical implications in metabolic disorders and inflammation.
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Affiliation(s)
- Sebastián M Maller
- Laboratorio de Glicómica Funcional y Molecular, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), Buenos Aires, Argentina.,Laboratorio de Inmunopatología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), Buenos Aires, Argentina
| | - Alejandro J Cagnoni
- Laboratorio de Glicómica Funcional y Molecular, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), Buenos Aires, Argentina
| | - Nadia Bannoud
- Laboratorio de Inmunopatología, Facultad de Ciencias Médicas, Instituto de Histología y Embriología de Mendoza (IHEM), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Lorena Sigaut
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and Instituto de Física de Buenos Aires (IFIBA-CONICET), Buenos Aires, Argentina
| | - Juan M Pérez Sáez
- Laboratorio de Inmunopatología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), Buenos Aires, Argentina
| | - Lía I Pietrasanta
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and Instituto de Física de Buenos Aires (IFIBA-CONICET), Buenos Aires, Argentina.,Centro de Microscopías Avanzadas (CMA), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ri-Yao Yang
- Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Fu-Tong Liu
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Diego O Croci
- Laboratorio de Inmunopatología, Facultad de Ciencias Médicas, Instituto de Histología y Embriología de Mendoza (IHEM), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Cuyo, Mendoza, Argentina.,Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Santiago Di Lella
- Instituto de Química Biológica, Ciencias Exactas y Naturales (IQUIBICEN-CONICET), Buenos Aires, Argentina.,Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Victoria Sundblad
- Laboratorio de Inmunopatología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), Buenos Aires, Argentina
| | - Gabriel A Rabinovich
- Laboratorio de Inmunopatología, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), Buenos Aires, Argentina.,Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Karina V Mariño
- Laboratorio de Glicómica Funcional y Molecular, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas (IBYME-CONICET), Buenos Aires, Argentina
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Effect of Sleeve Gastrectomy on Angiogenesis and Adipose Tissue Health in an Obese Animal Model of Type 2 Diabetes. Obes Surg 2019; 29:2942-2951. [DOI: 10.1007/s11695-019-03935-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Abstract
Myo-inositol is a ubiquitous cyclitol, has an important regulatory role, and its intracellular depletion is associated with pathological changes. Effects of myo-inositol on adipose tissue are poorly elucidated. In this report, short-term influence of 20, 100, and 500 µM myo-inositol on metabolism of the isolated rat adipocytes was studied. Cells were incubated for 90 min with glucose and insulin with or without myo-inositol and glucose conversion to lipids and lactate release were measured. Moreover, effects of myo-inositol on lipolysis and on the antilipolytic action of insulin were also studied. It was demonstrated that lipogenesis and lactate release were unchanged by myo-inositol. Moreover, lipolytic response to epinephrine and dibutyryl-cAMP was also unchanged. Myo-inositol was also found to be without influence on the antilipolytic action of insulin. Results of this study show that metabolism of the isolated rat adipocytes is not affected by short-term exposure of these cells to myo-inositol.
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Affiliation(s)
- Tomasz Szkudelski
- a Department of Animal Physiology and Biochemistry , Poznan University of Life Sciences , Poznan , Poland
| | - Iwona Hertig
- a Department of Animal Physiology and Biochemistry , Poznan University of Life Sciences , Poznan , Poland
| | - Katarzyna Szkudelska
- a Department of Animal Physiology and Biochemistry , Poznan University of Life Sciences , Poznan , Poland
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Izzicupo P, D’Amico MA, Di Blasio A, Napolitano G, Nakamura FY, Di Baldassarre A, Ghinassi B. Aerobic Training Improves Angiogenic Potential Independently of Vascular Endothelial Growth Factor Modifications in Postmenopausal Women. Front Endocrinol (Lausanne) 2017; 8:363. [PMID: 29312152 PMCID: PMC5742914 DOI: 10.3389/fendo.2017.00363] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Accepted: 12/11/2017] [Indexed: 11/13/2022] Open
Abstract
PURPOSE The purpose of this study is to evaluate the effect of walking-training on the balance between pro- and antiangiogenic signals and on the angiogenic potential in postmenopausal women. MATERIALS AND METHODS Thirty-four postmenopausal women (56.18 ± 4.24 years) participated in a 13 weeks program of walking-training. Anthropometric measures, vascular endothelial growth factor (VEGF), interleukin (IL)-1α, IL-1β, IL-2, IL-8, IL-10, IL-12p70, tumor necrosis factor-α (TNF-α), C-reactive protein, insulin, IGF-1, cortisol, dehydroepiandrosterone sulfate (DHEA-S), leptin, visfatin, resistin, and adiponectin were evaluated before and after training. Moreover, serum samples were tested for their ability to chemo-attract endothelial cells and to support the in vitro formation of capillary-like structures. RESULTS After training, the levels of IL-8, TNF-α, leptin, and resistin were significantly lower, levels of DHEA-S and adiponectin increased, serum angiogenic properties improved, whereas no changes in anthropometric parameters or VEGF were detected. CONCLUSION Walking training reduces inflammatory status and leads to a significant improvement in serum angiogenic properties in the absence of modifications in body composition and VEGF level.
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Affiliation(s)
- Pascal Izzicupo
- Department of Medicine and Aging Science, University “G. d’Annunzio” of Chieti - Pescara, Chieti, Italy
| | - Maria A. D’Amico
- Department of Medicine and Aging Science, University “G. d’Annunzio” of Chieti - Pescara, Chieti, Italy
| | - Andrea Di Blasio
- Department of Medicine and Aging Science, University “G. d’Annunzio” of Chieti - Pescara, Chieti, Italy
| | - Giorgio Napolitano
- Department of Medicine and Aging Science, University “G. d’Annunzio” of Chieti - Pescara, Chieti, Italy
| | - Fabio Y. Nakamura
- Department of Medicine and Aging Science, University “G. d’Annunzio” of Chieti - Pescara, Chieti, Italy
| | - Angela Di Baldassarre
- Department of Medicine and Aging Science, University “G. d’Annunzio” of Chieti - Pescara, Chieti, Italy
| | - Barbara Ghinassi
- Department of Medicine and Aging Science, University “G. d’Annunzio” of Chieti - Pescara, Chieti, Italy
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Duarte FO, Gomes-Gatto CDV, Oishi JC, Lino ADDS, Stotzer US, Rodrigues MFC, Gatti da Silva GH, Selistre-de-Araújo HS. Physical training improves visceral adipose tissue health by remodelling extracellular matrix in rats with estrogen absence: a gene expression analysis. Int J Exp Pathol 2017; 98:203-213. [PMID: 28884865 DOI: 10.1111/iep.12237] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 06/04/2017] [Indexed: 12/15/2022] Open
Abstract
Adipose tissue development is associated with modifications involving extracellular matrix remodelling, and metalloproteinases play a significant role in this process. Reduced circulating sexual hormones cause impacts on the size, morphology and functions of the adipose tissue, increasing susceptibility to diseases. This study investigated whether exercise training may be an alternative strategy to combat the effects promoted by estrogen decay through modulation in gene expression patterns in the extracellular matrix (ECM) of visceral adipose tissue of ovariectomized rats. Nulliparous rats (n = 40) were randomly distributed into four groups (n = 10/group): sham sedentary (Sh-S), sham resistance training (Sh-Rt), ovariectomized sedentary (Ovx-S) and ovariectomized resistance training (Ovx-Rt). The Sh-S animals did not have any type of training. The body mass and food intake, ECM gene expression, gelatinase MMP-2 activity and adipocyte area were measured. A lack of estrogen promoted an increase in body mass, food intake and the visceral, parametrial and subcutaneous adipocyte areas. The ovariectomy upregulated the expression of MMP-2, MMP-9, TGF-β, CTGF, VEGF-A and MMP-2 activity. On the other hand, resistance training decreased the body mass, food intake and the adipocyte area of the three fat depots analysed; upregulated TIMP-1, VEGF-A and MMP-2 gene expression; downregulated MMP-9, TGF-β and CTGF gene expression; and decreased the MMP-2 activity. We speculate that resistance training on a vertical ladder could play an important role in maintaining and remodelling ECM by modulation in the ECM gene expression and MMP-2 activity, avoiding its destabilization which is impaired by the lack of estrogen.
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Affiliation(s)
- Fernanda O Duarte
- Department of Physiological Sciences, Laboratory of Biochemistry and Molecular Biology, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil.,Laboratory of Nutrition and Metabolism Applied to Exercise, Department of Physical Education and Human Motricity, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
| | - Camila do Valle Gomes-Gatto
- Department of Physiological Sciences, Laboratory of Biochemistry and Molecular Biology, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
| | - Jorge C Oishi
- Laboratory of Nutrition and Metabolism Applied to Exercise, Department of Physical Education and Human Motricity, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
| | - Anderson Diogo de S Lino
- Laboratory of Nutrition and Metabolism Applied to Exercise, Department of Physical Education and Human Motricity, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
| | - Uliana S Stotzer
- Department of Physiological Sciences, Laboratory of Biochemistry and Molecular Biology, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
| | - Maria Fernanda C Rodrigues
- Department of Physiological Sciences, Laboratory of Biochemistry and Molecular Biology, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
| | - Guilherme H Gatti da Silva
- Department of Physiological Sciences, Laboratory of Biochemistry and Molecular Biology, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
| | - Heloisa S Selistre-de-Araújo
- Department of Physiological Sciences, Laboratory of Biochemistry and Molecular Biology, Universidade Federal de São Carlos-UFSCar, São Carlos, SP, Brazil
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8
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Rodrigues T, Matafome P, Sereno J, Almeida J, Castelhano J, Gamas L, Neves C, Gonçalves S, Carvalho C, Arslanagic A, Wilcken E, Fonseca R, Simões I, Conde SV, Castelo-Branco M, Seiça R. Methylglyoxal-induced glycation changes adipose tissue vascular architecture, flow and expansion, leading to insulin resistance. Sci Rep 2017; 7:1698. [PMID: 28490763 PMCID: PMC5431896 DOI: 10.1038/s41598-017-01730-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 03/23/2017] [Indexed: 01/04/2023] Open
Abstract
Microvascular dysfunction has been suggested to trigger adipose tissue dysfunction in obesity. This study investigates the hypothesis that glycation impairs microvascular architecture and expandability with an impact on insulin signalling. Animal models supplemented with methylglyoxal (MG), maintained with a high-fat diet (HFD) or both (HFDMG) were studied for periepididymal adipose (pEAT) tissue hypoxia and local and systemic insulin resistance. Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) was used to quantify blood flow in vivo, showing MG-induced reduction of pEAT blood flow. Increased adipocyte size and leptin secretion were observed only in rats feeding the high-fat diet, without the development of hypoxia. In turn, hypoxia was only observed when MG was combined (HFDMG group), being associated with impaired activation of the insulin receptor (Tyr1163), glucose intolerance and systemic and muscle insulin resistance. Accordingly, the adipose tissue angiogenic assay has shown decreased capillarization after dose-dependent MG exposure and glyoxalase-1 inhibition. Thus, glycation impairs adipose tissue capillarization and blood flow, hampering its expandability during a high-fat diet challenge and leading to hypoxia and insulin resistance. Such events have systemic repercussions in glucose metabolism and may lead to the onset of unhealthy obesity and progression to type 2 diabetes.
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Affiliation(s)
- Tiago Rodrigues
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Paulo Matafome
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal. .,Instituto Politécnico de Coimbra, Coimbra Health School (ESTeSC), Department of Complementary Sciences, Coimbra, Portugal.
| | - José Sereno
- Institute of Nuclear Sciences Applied to Health (CIBIT-ICNAS), University of Coimbra, Coimbra, Portugal
| | - José Almeida
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - João Castelhano
- Institute of Nuclear Sciences Applied to Health (CIBIT-ICNAS), University of Coimbra, Coimbra, Portugal
| | - Luís Gamas
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Christian Neves
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Sónia Gonçalves
- Institute of Nuclear Sciences Applied to Health (CIBIT-ICNAS), University of Coimbra, Coimbra, Portugal
| | - Catarina Carvalho
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Amina Arslanagic
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Elinor Wilcken
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Rita Fonseca
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Ilda Simões
- Serviço de Anatomia Patológica, University Hospital Center of Coimbra, Coimbra, Portugal
| | - Silvia Vilares Conde
- CEDOC, NOVA Medical School - Faculty of Medical Sciences, New University of Lisbon, Lisbon, Portugal
| | - Miguel Castelo-Branco
- Institute of Nuclear Sciences Applied to Health (CIBIT-ICNAS), University of Coimbra, Coimbra, Portugal.,Laboratory of Visual Neuroscience, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Raquel Seiça
- Laboratory of Physiology, CNC.IBILI and Faculty of Medicine, University of Coimbra, Coimbra, Portugal
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