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Kaneko YK, Morioka A, Sano M, Tashiro M, Watanabe N, Kasahara N, Nojiri M, Ishiwatari C, Ichinose K, Minami A, Suzuki T, Yamaguchi M, Kimura T, Ishikawa T. Asymmetric dimethylarginine accumulation under hyperglycemia facilitates β-cell apoptosis via inhibiting nitric oxide production. Biochem Biophys Res Commun 2022; 637:108-116. [DOI: 10.1016/j.bbrc.2022.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 10/28/2022] [Accepted: 11/06/2022] [Indexed: 11/10/2022]
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Caballano-Infantes E, Cahuana GM, Bedoya FJ, Salguero-Aranda C, Tejedo JR. The Role of Nitric Oxide in Stem Cell Biology. Antioxidants (Basel) 2022; 11:antiox11030497. [PMID: 35326146 PMCID: PMC8944807 DOI: 10.3390/antiox11030497] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 02/24/2022] [Accepted: 02/25/2022] [Indexed: 02/07/2023] Open
Abstract
Nitric oxide (NO) is a gaseous biomolecule endogenously synthesized with an essential role in embryonic development and several physiological functions, such as regulating mitochondrial respiration and modulation of the immune response. The dual role of NO in embryonic stem cells (ESCs) has been previously reported, preserving pluripotency and cell survival or inducing differentiation with a dose-dependent pattern. In this line, high doses of NO have been used in vitro cultures to induce focused differentiation toward different cell lineages being a key molecule in the regenerative medicine field. Moreover, optimal conditions to promote pluripotency in vitro are essential for their use in advanced therapies. In this sense, the molecular mechanisms underlying stemness regulation by NO have been studied intensively over the current years. Recently, we have reported the role of low NO as a hypoxia-like inducer in pluripotent stem cells (PSCs), which supports using this molecule to maintain pluripotency under normoxic conditions. In this review, we stress the role of NO levels on stem cells (SCs) fate as a new approach for potential cell therapy strategies. Furthermore, we highlight the recent uses of NO in regenerative medicine due to their properties regulating SCs biology.
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Affiliation(s)
- Estefanía Caballano-Infantes
- Department of Molecular Biology and Biochemical Engineering, Universidad Pablo de Olavide, 41013 Seville, Spain; (G.M.C.); (F.J.B.)
- Department of Regeneration and Cell Therapy, Andalusian Center for Molecular Biology and Regenerative Medicine (CABIMER), University of Pablo de Olavide-University of Seville-CSIC, 41092 Seville, Spain
- Correspondence: (E.C.-I.); (J.R.T.)
| | - Gladys Margot Cahuana
- Department of Molecular Biology and Biochemical Engineering, Universidad Pablo de Olavide, 41013 Seville, Spain; (G.M.C.); (F.J.B.)
- Biomedical Research Network for Diabetes and Related Metabolic Diseases-CIBERDEM, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Francisco Javier Bedoya
- Department of Molecular Biology and Biochemical Engineering, Universidad Pablo de Olavide, 41013 Seville, Spain; (G.M.C.); (F.J.B.)
- Biomedical Research Network for Diabetes and Related Metabolic Diseases-CIBERDEM, Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Carmen Salguero-Aranda
- Department of Pathology, Institute of Biomedicine of Seville (IBiS), Virgen del Rocio University Hospital, CSIC-University of Seville, 41013 Seville, Spain;
- Spanish Biomedical Research Network Centre in Oncology-CIBERONC, Instituto de Salud Carlos III, 28029 Madrid, Spain
- Department of Normal and Pathological Cytology and Histology, School of Medicine, University of Seville, 41004 Seville, Spain
| | - Juan R. Tejedo
- Department of Molecular Biology and Biochemical Engineering, Universidad Pablo de Olavide, 41013 Seville, Spain; (G.M.C.); (F.J.B.)
- Biomedical Research Network for Diabetes and Related Metabolic Diseases-CIBERDEM, Instituto de Salud Carlos III, 28029 Madrid, Spain
- Correspondence: (E.C.-I.); (J.R.T.)
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Maeda K, Tasaki M, Ando Y, Ohtsubo K. Galectin-lattice sustains function of cationic amino acid transporter and insulin secretion of pancreatic β cells. J Biochem 2021; 167:587-596. [PMID: 31960919 DOI: 10.1093/jb/mvaa007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 01/09/2020] [Indexed: 01/01/2023] Open
Abstract
Maintenance of cell surface residency and function of glycoproteins by lectins are essential for regulating cellular functions. Galectins are β-galactoside-binding lectins and form a galectin-lattice, which regulates stability, clustering, membrane sub-domain localization and endocytosis of plasmalemmal glycoproteins. We have previously reported that galectin-2 (Gal-2) forms a complex with cationic amino acid transporter 3 (CAT3) in pancreatic β cells, although the biological significance of the molecular interaction between Gal-2 and CAT3 has not been elucidated. In this study, we demonstrated that the structure of N-glycan of CAT3 was either tetra- or tri-antennary branch structure carrying β-galactosides, which works as galectin-ligands. Indeed, CAT3 bound to Gal-2 using β-galactoside epitope. Moreover, the disruption of the glycan-mediated bindings between galectins and CAT3 significantly reduced cell surface expression levels of CAT3. The reduced cell surface residency of CAT3 attenuated the cellular arginine uptake activities and subsequently reduced nitric oxide production, and thus impaired the arginine-stimulated insulin secretion of pancreatic β cells. These results indicate that galectin-lattice stabilizes CAT3 by preventing endocytosis to sustain the arginine-stimulated insulin secretion of pancreatic β cells. This provides a novel cell biological insight into the endocrinological mechanism of nutrition metabolism and homeostasis.
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Affiliation(s)
- Kento Maeda
- Department of Analytical Biochemistry;, Graduate School of Health Sciences, Kumamoto University, 4-24-1 Kuhonji, Chuo-Ku, Kumamoto 862-0976, Japan
| | - Masayoshi Tasaki
- Department of Morphological and Physiological Sciences, Graduate School of Health Sciences, Kumamoto University, 4-24-1 Kuhonji, Chuo-Ku, Kumamoto 862-0976, Japan.,Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860-0811, Japan
| | - Yukio Ando
- Depatment of Amyloidosis Research, Nagasaki International University, Nagasaki 859-3243, Japan
| | - Kazuaki Ohtsubo
- Department of Analytical Biochemistry;, Graduate School of Health Sciences, Kumamoto University, 4-24-1 Kuhonji, Chuo-Ku, Kumamoto 862-0976, Japan.,Department of Analytical Biochemistry, Faculty of Life Sciences, Kumamoto University, 4-24-1 Kuhonji, Chuo-Ku, Kumamoto 862-0976, Japan
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Caballano-Infantes E, Terron-Bautista J, Beltrán-Povea A, Cahuana GM, Soria B, Nabil H, Bedoya FJ, Tejedo JR. Regulation of mitochondrial function and endoplasmic reticulum stress by nitric oxide in pluripotent stem cells. World J Stem Cells 2017; 9:26-36. [PMID: 28289506 PMCID: PMC5329687 DOI: 10.4252/wjsc.v9.i2.26] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/09/2016] [Accepted: 01/14/2017] [Indexed: 02/06/2023] Open
Abstract
Mitochondrial dysfunction and endoplasmic reticulum stress (ERS) are global processes that are interrelated and regulated by several stress factors. Nitric oxide (NO) is a multifunctional biomolecule with many varieties of physiological and pathological functions, such as the regulation of cytochrome c inhibition and activation of the immune response, ERS and DNA damage; these actions are dose-dependent. It has been reported that in embryonic stem cells, NO has a dual role, controlling differentiation, survival and pluripotency, but the molecular mechanisms by which it modulates these functions are not yet known. Low levels of NO maintain pluripotency and induce mitochondrial biogenesis. It is well established that NO disrupts the mitochondrial respiratory chain and causes changes in mitochondrial Ca2+ flux that induce ERS. Thus, at high concentrations, NO becomes a potential differentiation agent due to the relationship between ERS and the unfolded protein response in many differentiated cell lines. Nevertheless, many studies have demonstrated the need for physiological levels of NO for a proper ERS response. In this review, we stress the importance of the relationships between NO levels, ERS and mitochondrial dysfunction that control stem cell fate as a new approach to possible cell therapy strategies.
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Tsuchiya H, Sakata N, Yoshimatsu G, Fukase M, Aoki T, Ishida M, Katayose Y, Egawa S, Unno M. Extracellular Matrix and Growth Factors Improve the Efficacy of Intramuscular Islet Transplantation. PLoS One 2015; 10:e0140910. [PMID: 26473955 PMCID: PMC4608691 DOI: 10.1371/journal.pone.0140910] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 10/01/2015] [Indexed: 12/24/2022] Open
Abstract
Background The efficacy of intramuscular islet transplantation is poor despite being technically simple, safe, and associated with reduced rates of severe complications. We evaluated the efficacy of combined treatment with extracellular matrix (ECM) and growth factors in intramuscular islet transplantation. Methods Male BALB/C mice were used for the in vitro and transplantation studies. The following three groups were evaluated: islets without treatment (islets-only group), islets embedded in ECM with growth factors (Matrigel group), and islets embedded in ECM without growth factors [growth factor-reduced (GFR) Matrigel group]. The viability and insulin-releasing function of islets cultured for 96 h were significantly improved in Matrigel and GFR Matrigel groups compared with the islets-only group. Results Blood glucose and serum insulin levels immediately following transplantation were significantly improved in the Matrigel and GFR Matrigel groups and remained significantly improved in the Matrigel group at postoperative day (POD) 28. On histological examination, significantly decreased numbers of TdT-mediated deoxyuridine triphosphate-biotin nick end labeling-positive islet cells and significantly increased numbers of Ki67-positive cells were observed in the Matrigel and GFR Matrigel groups at POD 3. Peri-islet revascularization was most prominent in the Matrigel group at POD 14. Conclusions The efficacy of intramuscular islet transplantation was improved by combination treatment with ECM and growth factors through the inhibition of apoptosis, increased proliferation of islet cells, and promotion of revascularization.
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Affiliation(s)
| | - Naoaki Sakata
- Department of Surgery, Tohoku University, Sendai, Japan
- * E-mail:
| | | | | | - Takeshi Aoki
- Department of Surgery, Tohoku University, Sendai, Japan
| | | | - Yu Katayose
- Department of Surgery, Tohoku University, Sendai, Japan
- Division of Integrated Surgery and Oncology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Shinichi Egawa
- Division of International Cooperation for Disaster Mediscine, International Research Institute of Disaster Science, Tohoku University, Sendai, Japan
| | - Michiaki Unno
- Department of Surgery, Tohoku University, Sendai, Japan
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Beltran-Povea A, Caballano-Infantes E, Salguero-Aranda C, Martín F, Soria B, Bedoya FJ, Tejedo JR, Cahuana GM. Role of nitric oxide in the maintenance of pluripotency and regulation of the hypoxia response in stem cells. World J Stem Cells 2015; 7:605-617. [PMID: 25914767 PMCID: PMC4404395 DOI: 10.4252/wjsc.v7.i3.605] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 11/13/2014] [Accepted: 12/17/2014] [Indexed: 02/06/2023] Open
Abstract
Stem cell pluripotency and differentiation are global processes regulated by several pathways that have been studied intensively over recent years. Nitric oxide (NO) is an important molecule that affects gene expression at the level of transcription and translation and regulates cell survival and proliferation in diverse cell types. In embryonic stem cells NO has a dual role, controlling differentiation and survival, but the molecular mechanisms by which it modulates these functions are not completely defined. NO is a physiological regulator of cell respiration through the inhibition of cytochrome c oxidase. Many researchers have been examining the role that NO plays in other aspects of metabolism such as the cellular bioenergetics state, the hypoxia response and the relationship of these areas to stem cell stemness.
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Tapia-Limonchi R, Díaz I, Cahuana GM, Bautista M, Martín F, Soria B, Tejedo JR, Bedoya FJ. Impact of exposure to low concentrations of nitric oxide on protein profile in murine and human pancreatic islet cells. Islets 2014; 6:e995997. [PMID: 25658244 PMCID: PMC4398281 DOI: 10.1080/19382014.2014.995997] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Homeostatic levels of nitric oxide (NO) protect efficiently against apoptotic death in both human and rodent pancreatic β cells, but the protein profile of this action remains to be determined. We have applied a 2 dimensional LC-MS-MALDI-TOF/TOF-based analysis to study the impact of protective NO in rat insulin-producing RINm5F cell line and in mouse and human pancreatic islets (HPI) exposed to serum deprivation condition. 24 proteins in RINm5F and 22 in HPI were identified to undergo changes in at least one experimental condition. These include stress response mitochondrial proteins (UQCRC2, VDAC1, ATP5C1, ATP5A1) in RINm5F cells and stress response endoplasmic reticulum proteins (HSPA5, PDIA6, VCP, GANAB) in HPI. In addition, metabolic and structural proteins, oxidoreductases and chaperones related with protein metabolism are also regulated by NO treatment. Network analysis of differentially expressed proteins shows their interaction in glucocorticoid receptor and NRF2-mediated oxidative stress response pathways and eNOS signaling. The results indicate that exposure to exogenous NO counteracts the impact of serum deprivation on pancreatic β cell proteome. Species differences in the proteins involved are apparent.
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Affiliation(s)
- Rafael Tapia-Limonchi
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)- Pablo de Olavide University; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
| | - Irene Díaz
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)- Pablo de Olavide University; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
| | - Gladys M Cahuana
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)- Pablo de Olavide University; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
| | - Mario Bautista
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)- Pablo de Olavide University; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
| | - Franz Martín
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)- Pablo de Olavide University; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
| | - Bernat Soria
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)-Fundación Progreso y Salud; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
| | - Juan R Tejedo
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)- Pablo de Olavide University; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
| | - Francisco J Bedoya
- Andalusian Center for Molecular Biology and
Regenerative Medicine (CABIMER)- Pablo de Olavide University; Biomedical Research
Network (CIBER) of Diabetes and Related Metabolic Diseases; RED-TERCEL;
Seville, Spain
- Correspondence to: Francisco J. Bedoya;
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Kurohane Kaneko Y, Ishikawa T. Dual role of nitric oxide in pancreatic β-cells. J Pharmacol Sci 2013; 123:295-300. [PMID: 24285083 DOI: 10.1254/jphs.13r10cp] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
An involvement of inducible nitric oxide (NO) synthase (NOS) in pancreatic β-cell degeneration during the process of type 1 diabetes has been well discussed. Recently, there is growing evidence for pivotal roles of constitutive NOS (cNOS) in β-cells; the presence of NOS1 and NOS3 in pancreatic β-cells and the effects of low-concentration NO, which is assumed to be derived from cNOS, on β-cell functions have been reported. However, the roles of cNOS-derived NO in β-cells are still under debate. One of the reasons seems to be that NO has multiple biological activities, which are dependent on its concentration. In β-cells, NO has been shown to exert positive and negative regulation of insulin secretion and anti- and pro-apoptotic activities, which is likely to be dependent on concentrations. In this review article, we will describe the current understanding of the roles of NO in pancreatic β-cells, especially focusing on cNOS-derived NO and its differential roles depending on concentrations.
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Affiliation(s)
- Yukiko Kurohane Kaneko
- Department of Pharmacology, School of Pharmaceutical Sciences, University of Shizuoka, Japan
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Bedoya FJ, Salguero-Aranda C, Cahuana GM, Tapia-Limonchi R, Soria B, Tejedo JR. Regulation of pancreatic β-cell survival by nitric oxide: clinical relevance. Islets 2012; 4:108-18. [PMID: 22614339 DOI: 10.4161/isl.19822] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The reduction of pancreatic β-cell mass is an important factor in the development of type 1 and type 2 diabetes. Understanding the mechanisms that regulate the maintenance of pancreatic β-cell mass as well as β-cell death is necessary for the establishment of therapeutic strategies. In this context, nitric oxide (NO) is a diatomic, gaseous, highly reactive molecule with biological activity that participates in the regulation of pancreatic β-cell mass. Two types of cellular responses can be distinguished depending on the level of NO production. First, pancreatic β-cells exposed to inflammatory cytokines, lipid stress or hyperglycaemia produce high concentrations of NO, mainly due to the activation of inducible NO synthase (iNOS), thus promoting cell death. Meanwhile, under homeostatic conditions, low concentrations of NO, constitutively produced by endothelial NO synthase (eNOS), promote cell survival. Here, we will discuss the current knowledge of the NO-dependent mechanisms activated during cellular responses, emphasizing those related to the regulation of cell survival.
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Affiliation(s)
- Francisco J Bedoya
- Andalusian Center for Molecular Biology and Regenerative Medicine, University Pablo de Olavide, CIBERDEM, RED-TERCEL, Seville, Spain
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Tilkorn DJ, Davies EM, Keramidaris E, Dingle AM, Gerrand YW, Taylor CJ, Han XL, Palmer JA, Penington AJ, Mitchell CA, Morrison WA, Dusting GJ, Mitchell GM. The in vitro preconditioning of myoblasts to enhance subsequent survival in an in vivo tissue engineering chamber model. Biomaterials 2012; 33:3868-79. [PMID: 22369961 DOI: 10.1016/j.biomaterials.2012.02.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Accepted: 02/02/2012] [Indexed: 12/27/2022]
Abstract
The effects of in vitro preconditioning protocols on the ultimate survival of myoblasts implanted in an in vivo tissue engineering chamber were examined. In vitro testing: L6 myoblasts were preconditioned by heat (42 °C; 1.5 h); hypoxia (<8% O(2); 1.5 h); or nitric oxide donors: S-nitroso-N-acetylpenicillamine (SNAP, 200 μM, 1.5 h) or 1-[N-(2-aminoethyl)-N-(2-aminoethyl)amino]-diazen-1-ium-1,2-diolate (DETA-NONOate, 500 μM, 7 h). Following a rest phase preconditioned cells were exposed to 24 h hypoxia, and demonstrated minimal overall cell loss, whilst controls (not preconditioned, but exposed to 24 h hypoxia) demonstrated a 44% cell loss. Phosphoimmunoblot analysis of pro-survival signaling pathways revealed significant activation of serine threonine kinase Akt with DETA-NONOate (p < 0.01) and heat preconditioning (p < 0.05). DETA-NONOate also activated ERK 1/2 signaling (p < 0.05). In vivo implantation: 100,000 preconditioned (heat, hypoxia, or DETA-NONOate) myoblasts were implanted in SCID mouse tissue engineering chambers. 100,000 (not preconditioned) myoblasts were implanted in control chambers. At 3 weeks, morphometric assessment of surviving myoblasts indicated myoblast percent volume (p = 0.012) and myoblasts/mm(2) (p = 0.0005) overall significantly increased in preconditioned myoblast chambers compared to control, with DETA-NONOate-preconditioned myoblasts demonstrating the greatest increase in survival (p = 0.007 and p = 0.001 respectively). DETA-NONOate therefore has potential therapeutic benefits to significantly improve survival of transplanted cells.
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Affiliation(s)
- Daniel J Tilkorn
- Department of Plastic Surgery, Burn Center, Hand Center, BG-University-Hospital Bergmannsheil, Ruhr-University Bochum, Germany
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Kang HM, Park S, Kim H. Insulin-like growth factor 2 enhances insulinogenic differentiation of human eyelid adipose stem cells via the insulin receptor. Cell Prolif 2011; 44:254-63. [PMID: 21535266 DOI: 10.1111/j.1365-2184.2011.00755.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
OBJECTIVES Previously, we have isolated stem cells (HEAC) from human eyelid adipose tissue and functionally differentiated them into insulin-secreting cells. In the present study, we examined whether insulin family members might influence insulinogenic differentiation of HEAC. MATERIALS AND METHODS Following culture in differentiation media containing insulin family member or not, cells were examined for gene expression, protein expression and, particularly, insulin and C-peptide secretion, in response to high glucose challenge. Using antibodies against the specific receptor, target receptor mediating effect of the insulin family member was investigated. RESULTS Insulin treatment during culture had little effect on either insulin or C-peptide secretion from HEAC, against high glucose challenge after culture. However, insulin-like growth factor (IGF) 1 treatment decreased both secretions, and interestingly, IGF2 greatly increased the secretions. HEAC treated with IGF2 had strong expression of Pdx1, Isl1, Pax6 and PC1/3 genes, and distinct staining after insulin and C-peptide antibodies, and dithizone. IGF2-enhanced insulinogenic differentiation was totally blocked by antibody against insulin receptor (IR), but not by anti-IGF1 receptor (IGF1R). Differentiated HEAC expressed both IR and IGF1R genes, whereas they expressed neither IGF2 nor IGF2R genes. CONCLUSIONS From these results, it is suggested that IGF1 might inhibit insulinogenic differentiation of HEAC, whereas IGF2 enhances differentiation, and that enhancement of IGF2 appeared to be mediated via IR.
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Affiliation(s)
- H M Kang
- Department of Biotechnology, Seoul Women's University, Kongnung-dong, Nowon-gu, Seoul, Korea
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Low concentrations of nitric oxide delay the differentiation of embryonic stem cells and promote their survival. Cell Death Dis 2010; 1:e80. [PMID: 21368853 PMCID: PMC3035898 DOI: 10.1038/cddis.2010.57] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Nitric oxide (NO) is an intracellular messenger in several cell systems, but its contribution to embryonic stem cell (ESC) biology has not been characterized. Exposure of ESCs to low concentrations (2-20 μM) of the NO donor diethylenetriamine NO adduct confers protection from apoptosis elicited by leukaemia inhibitory factor (LIF) withdrawal. NO blocked caspase 3 activation, PARP degradation, downregulation of the pro-apoptotic genes Casp7, Casp9, Bax and Bak1 and upregulation of the anti-apoptotic genes Bcl-2 111, Bcl-2 and Birc6. These effects were also observed in cells overexpressing eNOS. Exposure of LIF-deprived mESCs to low NO prevented the loss of expression of self-renewal genes (Oct4, Nanog and Sox2) and the SSEA marker. Moreover, NO blocked the differentiation process promoted by the absence of LIF and bFGF in mouse and human ESCs. NO treatment decreased the expression of differentiation markers, such as Brachyury, Gata6 and Gata4. Constitutive overexpression of eNOS in cells exposed to LIF deprivation maintained the expression of self-renewal markers, whereas the differentiation genes were repressed. These effects were reversed by addition of the NOS inhibitor L-NMMA. Altogether, the data suggest that low NO has a role in the regulation of ESC differentiation by delaying the entry into differentiation, arresting the loss of self-renewal markers and promoting cell survival by inhibiting apoptosis.
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Venieratos PD, Drossopoulou GI, Kapodistria KD, Tsilibary EC, Kitsiou PV. High glucose induces suppression of insulin signalling and apoptosis via upregulation of endogenous IL-1beta and suppressor of cytokine signalling-1 in mouse pancreatic beta cells. Cell Signal 2010; 22:791-800. [PMID: 20067833 DOI: 10.1016/j.cellsig.2010.01.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 12/22/2009] [Accepted: 01/05/2010] [Indexed: 12/31/2022]
Abstract
Chronic hyperglycemia and inflammatory cytokines disrupt and/or attenuate signal transduction pathways that promote normal beta-cell survival, leading to the destruction of endocrine pancreas in type 2 diabetes. There is convincing evidence that autocrine insulin signalling exerts protective anti-apoptotic effects on beta cells. Suppressors of cytokine signalling (SOCS) were induced by several cytokines and inhibit insulin-initiated signal transduction. The aim of this study was to investigate whether high glucose can influence endogenous interleukin-1beta (IL-1beta) and SOCS expression thus affecting insulin signalling and survival in insulin-producing mouse pancreatic beta cells (betaTC-6). Results showed that prolonged exposure of betaTC-6 cells to increased glucose concentrations resulted in significant inhibition of insulin-induced tyrosine phosphorylation of the insulin receptor (IR), and insulin receptor substrate-2 (IRS-2) as well as PI3-kinase activation. These changes were accompanied by impaired activation of the anti-apoptotic signalling protein Akt and annulment of Akt-mediated suppression of the Forkhead family of transcription factors (FoxO) activation. Glucose-induced attenuation of IRS-2/Akt-mediated signalling was associated with increased IL-1beta expression. Enhanced endogenous IL-1beta specifically induced mRNA and protein expression of SOCS-1 in betaTC-6 cells. Inhibition of SOCS-1 expression by SOCS-1-specific small interfering RNA restored IRS-2/PI3K-mediated Akt phosphorylation suppressed by high glucose. The upregulation of endogenous cytokine signalling and FoxO activation were accompanied by enhanced caspase-3 activation and increased susceptibility of cells to apoptosis. These results indicated that glucose-induced endogenous IL-1beta expression increased betaTC-6 cells apoptosis by inhibiting, at least in part, IRS-2/Akt-mediated signalling through SOCS-1 upregulation.
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Affiliation(s)
- Panagiotis D Venieratos
- Institute of Biology, National Centre for Scientific Research "Demokritos", Athens, Attiki, Greece
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14
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Current world literature. Curr Opin Organ Transplant 2009; 14:103-11. [PMID: 19337155 DOI: 10.1097/mot.0b013e328323ad31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Shaked M, Ketzinel-Gilad M, Ariav Y, Cerasi E, Kaiser N, Leibowitz G. Insulin counteracts glucotoxic effects by suppressing thioredoxin-interacting protein production in INS-1E beta cells and in Psammomys obesus pancreatic islets. Diabetologia 2009; 52:636-44. [PMID: 19214472 DOI: 10.1007/s00125-009-1274-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2008] [Accepted: 01/12/2009] [Indexed: 02/07/2023]
Abstract
AIMS/HYPOTHESIS In type 2 diabetes, glucose toxicity leads to beta cell apoptosis with decreased beta cell mass as a consequence. Thioredoxin-interacting protein (TXNIP) is a critical mediator of glucose-induced beta cell apoptosis. Since hyperglycaemia leads to elevated serum insulin, we hypothesised that insulin is involved in the regulation of TXNIP protein levels in beta cells. METHODS We studied the production of TXNIP in INS-1E beta cells and in islets of Psammomys obesus, an animal model of type 2 diabetes, in response to glucose and different modulators of insulin secretion. RESULTS TXNIP production was markedly augmented in islets from diabetic P. obesus and in beta cells exposed to high glucose concentration. In contrast, adding insulin to the culture medium or stimulating insulin secretion with different secretagogues suppressed TXNIP. Inhibition of glucose and fatty acid-stimulated insulin secretion with diazoxide increased TXNIP production in beta cells. Nitric oxide (NO), a repressor of TXNIP, enhanced insulin signal transduction, whereas inhibition of NO synthase abolished its activation, suggesting that TXNIP inhibition by NO is mediated by stimulation of insulin signalling. Treatment of beta cells chronically exposed to high glucose with insulin reduced beta cell apoptosis. Txnip knockdown mimicking the effect of insulin prevented glucose-induced beta cell apoptosis. CONCLUSIONS/INTERPRETATION Insulin is a potent repressor of TXNIP, operating a negative feedback loop that restrains the stimulation of TXNIP by chronic hyperglycaemia. Repression of TXNIP by insulin is probably an important compensatory mechanism protecting beta cells from oxidative damage and apoptosis in type 2 diabetes.
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Affiliation(s)
- M Shaked
- Endocrinology and Metabolism Service, Department of Medicine, Hadassah, Hebrew University Medical Center, P.O. Box 12000, Jerusalem, 91120, Israel
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