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Ribeiro IT, Fioretto MN, Dos Santos SAA, Colombelli KT, Portela LMF, Niz Alvarez MV, de Magalhães Padilha P, Delgado AQ, Marques MVLSG, Bosqueiro JR, Seiva FRF, Barbisan LF, de Andrade Paes AM, Zambrano E, Justulin LA. Maternal protein restriction combined with postnatal sugar consumption alters liver proteomic profile and metabolic pathways in adult male offspring rats. Mol Cell Endocrinol 2024; 592:112316. [PMID: 38880278 DOI: 10.1016/j.mce.2024.112316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 06/13/2024] [Accepted: 06/14/2024] [Indexed: 06/18/2024]
Abstract
This study investigated the impact of maternal protein restriction (MPR) and early postnatal sugar consumption (SUG) on the liver health of adult male descendant rats. Male offspring of mothers fed a normal protein diet (NPD) or a low protein diet (LPD) were divided into four groups: Control (CTR), Sugar Control (CTR + SUG), LPD during gestation and lactation (GLLP), and LPD with sugar (GLLP + SUG). Sugar consumption (10% glucose diluted in water) began after weaning on day 21 (PND 21), and at 90 days (PND 90), rats were sacrificed for analysis. Sugar intake reduced food intake and increased water consumption in CTR + SUG and GLLP + SUG compared to CTR and GLLP. GLLP and GLLP + SUG groups showed lower body weight and total and retroperitoneal fat compared to CTR and CTR + SUG. CTR + SUG and GLLP + SUG groups exhibited hepatocyte vacuolization associated with increased hepatic glycogen content compared to CTR and GLLP. Hepatic catalase activity increased in GLLP compared to CTR. Proteomic analysis identified 223 differentially expressed proteins (DEPs) among experimental groups. While in the GLLP group, the DEPs enriched molecular pathways related to cellular stress, glycogen metabolic pathways were enriched in the GLLP + SUG and CTR + SUG groups. The association of sugar consumption amplifies the effects of MPR, deregulating molecular mechanisms related to metabolism and the antioxidant system.
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Affiliation(s)
- Isabelle Tenori Ribeiro
- UNESP- Sao Paulo State University, Department of Structural and Functional Biology, Institute of Biosciences, Botucatu, SP, Brazil
| | - Matheus Naia Fioretto
- UNESP- Sao Paulo State University, Department of Structural and Functional Biology, Institute of Biosciences, Botucatu, SP, Brazil
| | - Sérgio Alexandre Alcantara Dos Santos
- UNESP- Sao Paulo State University, Department of Structural and Functional Biology, Institute of Biosciences, Botucatu, SP, Brazil; Cancer Signaling and Epigenetics Program, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
| | - Ketlin Thassiani Colombelli
- UNESP- Sao Paulo State University, Department of Structural and Functional Biology, Institute of Biosciences, Botucatu, SP, Brazil
| | - Luiz Marcos Frediani Portela
- UNESP- Sao Paulo State University, Department of Structural and Functional Biology, Institute of Biosciences, Botucatu, SP, Brazil
| | | | - Pedro de Magalhães Padilha
- Department of Chemical and Biological Sciences, Institute of Biosciences, Sao Paulo State University, Botucatu, SP, Brazil
| | - Aislan Quintiliano Delgado
- Department of Physical Education, Institute of Biosciences, Sao Paulo State University, Bauru, SP, Brazil
| | | | - José Roberto Bosqueiro
- Department of Physical Education, Institute of Biosciences, Sao Paulo State University, Bauru, SP, Brazil
| | - Fábio Rodrigues Ferreira Seiva
- Department of Chemical and Biological Sciences, Institute of Biosciences, Sao Paulo State University, Botucatu, SP, Brazil
| | - Luís Fernando Barbisan
- UNESP- Sao Paulo State University, Department of Structural and Functional Biology, Institute of Biosciences, Botucatu, SP, Brazil
| | | | - Elena Zambrano
- Department Reproductive Biology, Salvador Zubirán National Institute of Medical Sciences and Nutrition, Mexico City, Mexico; Facultad de Química, Universidad Nacional Autónoma de Mexico, Mexico City, Mexico
| | - Luis Antonio Justulin
- UNESP- Sao Paulo State University, Department of Structural and Functional Biology, Institute of Biosciences, Botucatu, SP, Brazil.
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Schavinski AZ, Reis NG, Morgan HJN, Assis AP, Moro ML, Valentim RR, Seni-Silva AC, Ramos ES, Kettelhut IC, Navegantes LCC. Maternal Vitamin D Deficiency Impairs the Development of β Cells in Offspring Rats in a Sex-Dependent Manner. Int J Mol Sci 2024; 25:4136. [PMID: 38673723 PMCID: PMC11050228 DOI: 10.3390/ijms25084136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 04/03/2024] [Accepted: 04/04/2024] [Indexed: 04/28/2024] Open
Abstract
Recent studies have shown that maternal vitamin D deficiency (VDD) causes long-term metabolic changes in offspring. However, little is known about the impact of maternal VDD on offspring endocrine pancreas development and insulin secretion in the adult life of male and female animals. Female rats (Wistar Hannover) were fed either control (1000 IU Vitamin D3/kg), VDD (0 IU Vitamin D3/kg), or a Ca2+-enriched VDD diet (0 IU Vitamin D3/kg + Ca2+ and P/kg) for 6 weeks and during gestation and lactation. At weaning, VDD status was confirmed based on low serum calcidiol levels in dams and pups. Next, male and female offspring were randomly separated and fed a standard diet for up to 90 days. At this age, serum calcidiol levels were restored to normal levels in all groups, but serum insulin levels were decreased in VDD males without affecting glucagon levels, glycemia, or glucose tolerance. Islets isolated from VDD males showed lower insulin secretion in response to different glucose concentrations, but this effect was not observed in VDD females. Furthermore, VDD males, but not females, showed a smaller total pancreatic islet area and lower β cell mass, an effect that was accompanied by reduced gene expression of Ins1, Ins2, Pdx1, and SLC2A2. The decrease in Pdx1 expression was not related to the methylation profile of the promoter region of this gene. Most of these effects were observed in the male VDD+Ca2+ group, indicating that the effects were not due to alterations in Ca2+ metabolism. These data show that maternal VDD selectively impairs the morphology and function of β cells in adult male offspring rats and that female offspring are fully protected from these deleterious effects.
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Affiliation(s)
- Aline Z. Schavinski
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.Z.S.); (N.G.R.); (H.J.N.M.); (M.L.M.); (R.R.V.)
| | - Natany G. Reis
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.Z.S.); (N.G.R.); (H.J.N.M.); (M.L.M.); (R.R.V.)
| | - Henrique J. N. Morgan
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.Z.S.); (N.G.R.); (H.J.N.M.); (M.L.M.); (R.R.V.)
| | - Ana Paula Assis
- Department of Biochemistry/Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.P.A.); (I.C.K.)
| | - Matheus L. Moro
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.Z.S.); (N.G.R.); (H.J.N.M.); (M.L.M.); (R.R.V.)
| | - Rafael R. Valentim
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.Z.S.); (N.G.R.); (H.J.N.M.); (M.L.M.); (R.R.V.)
| | - Ana Carolina Seni-Silva
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.C.S.-S.); (E.S.R.)
| | - Ester S. Ramos
- Department of Genetics, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.C.S.-S.); (E.S.R.)
| | - Isis C. Kettelhut
- Department of Biochemistry/Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.P.A.); (I.C.K.)
| | - Luiz C. C. Navegantes
- Department of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto 14049-900, SP, Brazil; (A.Z.S.); (N.G.R.); (H.J.N.M.); (M.L.M.); (R.R.V.)
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Sales ALCC, Primo MGS, Mello Neto RS, Mendes AVS, Furtado MM, Rocha JÉL, Almeida JOCS, França JVS, Alencar SR, Brito AKS, Lopes LO, Rizzo MS, Lustosa AKMF, Nunes PHM, Lucarini M, Durazzo A, Arcanjo DDR, Martins MDCC. A Preliminary Study on Hepatoprotective, Hypolipidemic and Aortic Morphometric Effects of Omega-3-Rich Fish Oil in Hypercholesterolemic Mice. Pharmaceuticals (Basel) 2024; 17:72. [PMID: 38256905 PMCID: PMC10819677 DOI: 10.3390/ph17010072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2023] [Revised: 12/30/2023] [Accepted: 01/03/2024] [Indexed: 01/24/2024] Open
Abstract
This study aims to evaluate the hepatoprotective, hypolipidemic and aortic morphometric effects of fish oil rich in omega-3 in hypercholesterolemic BALB/c mice. This is an experimental model that included 16 male BALB/c mice (Mus musculus) divided into three groups (G1 (standard commercial chow and 0.9% saline solution), G2 (hypercholesterolemic diet and 0.9% saline solution) and G3 (hypercholesterolemic diet and fish oil)) for 8 weeks. There was no significant difference in the treatment with omega-3-rich fish oil in the lipid profile (p > 0.05). In the histological analysis, group G2 detected the presence of hepatitis and liver tissue necrosis, but this was not observed in group G3. As for the morphometry in the light area of the vessel, the G1 group had a higher score (2.62 ± 0.36 mm2) when compared to G2 (2.10 ± 0.16 mm2) and G3 (2.26 ± 0.25 mm2) (p < 0.05). The vessel wall thickness did not differ between the groups (p > 0.05). It is concluded that supplementation with fish oil rich in omega-3 carried out in this study may have a protective effect on liver tissue, but it has not yet improved the lipid and morphometric profile. Despite this research being preliminary, it is a relevant study with future prospects for improving the doses of EPA and DHA in order to better elucidate the benefits of fish oil in models of dyslipidemia.
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Affiliation(s)
- Ana Lina C. C. Sales
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
- University Hospital, Federal University of Piauí, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil;
| | - Maísa G. S. Primo
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Renato S. Mello Neto
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Ana Victória S. Mendes
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Mariely M. Furtado
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Joana Érica L. Rocha
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - José Otávio C. S. Almeida
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - José Vinícius S. França
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Salmon R. Alencar
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Ana Karolinne S. Brito
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Luana O. Lopes
- University Hospital, Federal University of Piauí, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil;
| | - Márcia S. Rizzo
- Department of Morphology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil;
| | - Ana Karina M. F. Lustosa
- Galeno Farmácia de Manipulação, Virgínia Regina Fortes Castelo Branco e Cia. Ltda., Teresina 64001-260, PI, Brazil;
| | - Paulo Humberto M. Nunes
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Massimo Lucarini
- CREA-Research Centre for Food and Nutrition, Via Ardeatina 546, 00178 Rome, Italy;
| | - Alessandra Durazzo
- CREA-Research Centre for Food and Nutrition, Via Ardeatina 546, 00178 Rome, Italy;
| | - Daniel Dias Rufino Arcanjo
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
| | - Maria do Carmo C. Martins
- Department of Biophysics and Physiology, Federal University of Piaui, Campus Ministro Petrônio Portella, Ininga, Teresina 64049-550, PI, Brazil; (A.L.C.C.S.); (M.G.S.P.); (R.S.M.N.); (A.V.S.M.); (M.M.F.); (J.É.L.R.); (J.O.C.S.A.); (J.V.S.F.); (S.R.A.); (A.K.S.B.); (P.H.M.N.); (D.D.R.A.)
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Trevizol JS, Dionizio A, Delgado AQ, Ventura TMO, Ribeiro CFDS, Ribeiro L, Buzalaf NR, Cestari TM, Magalhães AC, Suzuki M, Bosqueiro JR, Buzalaf MAR. Metabolic effect of low fluoride levels in the islets of NOD mice: integrative morphological, immunohistochemical, and proteomic analyses. J Appl Oral Sci 2023; 31:e20230036. [PMID: 37283331 PMCID: PMC10247282 DOI: 10.1590/1678-7757-2023-0036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/31/2023] [Accepted: 05/03/2023] [Indexed: 06/08/2023] Open
Abstract
OBJECTIVES Fluoride (F) has been widely used to control dental caries, and studies suggest beneficial effects against diabetes when a low dose of F is added to the drinking water (10 mgF/L). This study evaluated metabolic changes in pancreatic islets of NOD mice exposed to low doses of F and the main pathways altered by the treatment. METHODOLOGY In total, 42 female NOD mice were randomly divided into two groups, considering the concentration of F administered in the drinking water for 14 weeks: 0 or 10 mgF/L. After the experimental period, the pancreas was collected for morphological and immunohistochemical analysis, and the islets for proteomic analysis. RESULTS In the morphological and immunohistochemical analysis, no significant differences were found in the percentage of cells labelled for insulin, glucagon, and acetylated histone H3, although the treated group had higher percentages than the control group. Moreover, no significant differences were found for the mean percentages of pancreatic areas occupied by islets and for the pancreatic inflammatory infiltrate between the control and treated groups. Proteomic analysis showed large increases in histones H3 and, to a lesser extent, in histone acetyltransferases, concomitant with a decrease in enzymes involved in the formation of acetyl-CoA, besides many changes in proteins involved in several metabolic pathways, especially energy metabolism. The conjunction analysis of these data showed an attempt by the organism to maintain protein synthesis in the islets, even with the dramatic changes in energy metabolism. CONCLUSION Our data suggests epigenetic alterations in the islets of NOD mice exposed to F levels comparable to those found in public supply water consumed by humans.
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Affiliation(s)
- Juliana Sanches Trevizol
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
| | - Aline Dionizio
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
| | | | | | | | - Laura Ribeiro
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
| | - Nathalia Rabelo Buzalaf
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
| | - Tânia Mary Cestari
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
| | - Ana Carolina Magalhães
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
| | - Maiko Suzuki
- The Dental College of Georgia, Department of Oral Biology and Diagnostic Sciences, Augusta, Georgia, United States
| | - José Roberto Bosqueiro
- Universidade Estadual Paulista, Faculdade de Ciências, Departamento de Educação Física, Bauru, São Paulo, Brasil
| | - Marília Afonso Rabelo Buzalaf
- Universidade de São Paulo, Faculdade de Odontologia de Bauru, Departamento de Ciências Biológicas, Bauru, SP, Brasil
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Martins JRN, Lopes S, Hurtado HN, da Silva FN, Villard DR, Taboga SR, Souza KLA, Quesada I, Soriano S, Rafacho A. Acute and chronic effects of the organophosphate malathion on the pancreatic α and β cell viability, cell structure, and voltage-gated K + currents. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 98:104046. [PMID: 36587778 DOI: 10.1016/j.etap.2022.104046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 12/09/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
Studies indicate that the pesticide malathion may have a role in diabetes. Herein, we determined the effects of different concentrations of malathion on survival, ultrastructure, and electrophysiologic islet cell parameters. Acutely, high concentrations of malathion (0.5 or 1 mM) increased cell death in rat islet cells, while low concentrations (0.1 mM) caused signs of cell damage in pancreatic α and β cells. Exposure of RINm5F cells to malathion for 24 or 48 h confirmed the reduction in β-cell viability at lower concentrations (0.001-100 µM). Chronic exposure of mouse pancreatic α and β cells to 3 nM of malathion led to increased voltage-gated K+ (Kv) currents in α-cells. Our findings show a time and concentration dependency for the malathion effect on the reduction of islet cell viability and indicate that pancreatic α cells are more sensitive to malathion effects on Kv currents and cell death.
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Affiliation(s)
- J R N Martins
- Laboratory of Investigation in Chronic Diseases LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina UFSC, Florianópolis, Brazil; Graduate Program in Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina UFSC, Florianópolis, Brazil
| | - S Lopes
- Central Laboratory of Electron Microscopy LCME, PROPESQ, Federal University of Santa Catarina UFSC, Florianópolis, Brazil
| | - H N Hurtado
- Department of Physiology, Genetics, and Microbiology, University of Alicante, Alicante, Spain
| | - F N da Silva
- Laboratory of Investigation in Chronic Diseases LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina UFSC, Florianópolis, Brazil; Graduate Program in Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina UFSC, Florianópolis, Brazil
| | - D R Villard
- NUMPEX-BIO, Campus Duque de Caxias, Universidade Federal do Rio de Janeiro (UFRJ), Campus UFRJ Duque de Caxias Prof. Geraldo Cidade, Duque de Caxias 25245-390, Brazil
| | - S R Taboga
- Department of Biological Sciences, Laboratory of Microscopy and Microanalysis, Universidade Estadual Paulista-UNESP, São Paulo, Brazil
| | - K L A Souza
- NUMPEX-BIO, Campus Duque de Caxias, Universidade Federal do Rio de Janeiro (UFRJ), Campus UFRJ Duque de Caxias Prof. Geraldo Cidade, Duque de Caxias 25245-390, Brazil
| | - I Quesada
- Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universidad Miguel Hernández, Elche, Spain; Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM), Madrid, Spain
| | - S Soriano
- Department of Physiology, Genetics, and Microbiology, University of Alicante, Alicante, Spain; Instituto de Investigación, Desarrollo e Innovación en Biotecnología Sanitaria de Elche (IDiBE), Universidad Miguel Hernández, Elche, Spain
| | - A Rafacho
- Laboratory of Investigation in Chronic Diseases LIDoC, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina UFSC, Florianópolis, Brazil; Graduate Program in Pharmacology, Center of Biological Sciences, Federal University of Santa Catarina UFSC, Florianópolis, Brazil.
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dos Santos C, Karagiannopoulos A, Rafacho A, Perfilyev A, Eliasson L, Ling C, Bacos K. Glucocorticoids and glucolipotoxicity alter the DNA methylome and function of human EndoC-βH1 cells. Life Sci 2022; 307:120854. [DOI: 10.1016/j.lfs.2022.120854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/20/2022] [Accepted: 07/27/2022] [Indexed: 10/16/2022]
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Coadministration of sitagliptin or metformin has no major impact on the adverse metabolic outcomes induced by dexamethasone treatment in rats. Life Sci 2021; 286:120026. [PMID: 34627773 DOI: 10.1016/j.lfs.2021.120026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/20/2021] [Accepted: 10/01/2021] [Indexed: 11/23/2022]
Abstract
AIMS Glucocorticoids (GC) in excess cause glucose intolerance and dyslipidemia due to their diabetogenic actions. Conceptually, antidiabetic drugs should attenuate these side effects. Thus, we evaluated whether the coadministration of metformin or sitagliptin (or both) with dexamethasone could attenuate GC-induced adverse effects on metabolism. MATERIALS AND METHODS Adult male rats were treated for 5 consecutive days with dexamethasone (1 mg/kg, body mass (bm), intraperitoneally). Additional groups were coadministered with metformin (300 mg/kg, bm, by oral gavage (og)) or sitagliptin (20 mg/kg, bm, og) or with both compounds in combination. The day after the last treatments, rats were submitted to glucose tolerance tests, pyruvate tolerance test, and euthanized for biometric, biochemical, morphologic, and molecular analyses. KEY FINDINGS Dexamethasone treatment resulted in reduced body mass and food intake, increased blood glucose and plasma insulin, dyslipidemia, glucose intolerance, pyruvate intolerance, and increased hepatic content of glycogen and fat. Sitagliptin coadministration improved glucose tolerance compared with the control group, an effect paralleled with higher levels of active GLP-1 during an oral GTT. Overall, sitagliptin or metformin coadministration did not prevent any of the dexamethasone-induced metabolic disturbances. SIGNIFICANCE Coadministration of sitagliptin or metformin result in no major improvement of glucose and lipid metabolism altered by dexamethasone treatment in male adult rats.
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8
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Razavi M, Wang J, Thakor AS. Localized drug delivery graphene bioscaffolds for cotransplantation of islets and mesenchymal stem cells. SCIENCE ADVANCES 2021; 7:eabf9221. [PMID: 34788097 PMCID: PMC8597999 DOI: 10.1126/sciadv.abf9221] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 09/28/2021] [Indexed: 06/01/2023]
Abstract
In the present work, we developed, characterized, and tested an implantable graphene bioscaffold which elutes dexamethasone (Dex) that can accommodate islets and adipose tissue–derived mesenchymal stem cells (AD-MSCs). In vitro studies demonstrated that islets in graphene–0.5 w/v% Dex bioscaffolds had a substantial higher viability and function compared to islets in graphene-alone bioscaffolds or islets cultured alone (P < 0.05). In vivo studies, in which bioscaffolds were transplanted into the epididymal fat pad of diabetic mice, demonstrated that, when islet:AD-MSC units were seeded into graphene–0.5 w/v% Dex bioscaffolds, this resulted in complete restoration of glycemic control immediately after transplantation with these islets also showing a faster response to glucose challenges (P < 0.05). Hence, this combination approach of using a graphene bioscaffold that can be functionalized for local delivery of Dex into the surrounding microenvironment, together with AD-MSC therapy, can significantly improve the survival and function of transplanted islets.
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Affiliation(s)
- Mehdi Razavi
- Interventional Regenerative Medicine and Imaging Laboratory, Department of Radiology, Stanford University School of Medicine, Palo Alto, CA 94304, USA
- Biionix™ (Bionic Materials, Implants & Interfaces) Cluster, Department of Internal Medicine, College of Medicine, University of Central Florida, Orlando, FL 32827, USA
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA
| | - Jing Wang
- Interventional Regenerative Medicine and Imaging Laboratory, Department of Radiology, Stanford University School of Medicine, Palo Alto, CA 94304, USA
| | - Avnesh S. Thakor
- Interventional Regenerative Medicine and Imaging Laboratory, Department of Radiology, Stanford University School of Medicine, Palo Alto, CA 94304, USA
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9
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Queiroz LAD, Assis JB, Guimarães JPT, Sousa ESA, Milhomem AC, Sunahara KKS, Sá-Nunes A, Martins JO. Endangered Lymphocytes: The Effects of Alloxan and Streptozotocin on Immune Cells in Type 1 Induced Diabetes. Mediators Inflamm 2021; 2021:9940009. [PMID: 34712101 PMCID: PMC8548114 DOI: 10.1155/2021/9940009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 09/06/2021] [Accepted: 09/16/2021] [Indexed: 12/31/2022] Open
Abstract
Alloxan (ALX) and streptozotocin (STZ) are extensively used to induce type 1 diabetes (T1D) in animal models. This study is aimed at evaluating the differences in immune parameters caused by ALX and STZ. T1D was induced either with ALX or with STZ, and the animals were followed for up to 180 days. Both ALX and STZ induced a decrease in the total number of circulating leukocytes and lymphocytes, with an increase in granulocytes when compared to control mice (CT). STZ-treated mice also exhibited an increase in neutrophils and a reduction in the lymphocyte percentage in the bone marrow. In addition, while the STZ-treated group showed a decrease in total CD3+, CD4-CD8+, and CD4+CD8+ T lymphocytes in the thymus and CD19+ B lymphocytes in the pancreas and spleen, the ALX group showed an increase in CD4-CD8+ and CD19+ only in the thymus. Basal levels of splenic interleukin- (IL-) 1β and pancreatic IL-6 in the STZ group were decreased. Both diabetic groups showed atrophy of the thymic medulla and degeneration of pancreatic islets of Langerhans composed of inflammatory infiltration and hyperemia with vasodilation. ALX-treated mice showed a decrease in reticuloendothelial cells, enhanced lymphocyte/thymocyte cell death, and increased number of Hassall's corpuscles. Reduced in vitro activation of splenic lymphocytes was found in the STZ-treated group. Furthermore, mice immunized with ovalbumin (OVA) showed a more intense antigen-specific paw edema response in the STZ-treated group, while production of anti-OVA IgG1 antibodies was similar in both groups. Thereby, important changes in immune cell parameters in vivo and in vitro were found at an early stage of T1D in the STZ-treated group, whereas alterations in the ALX-treated group were mostly found in the chronic phase of T1D, including increased mortality rates. These findings suggest that the effects of ALX and STZ influenced, at different times, lymphoid organs and their cell populations.
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Affiliation(s)
- Luiz A. D. Queiroz
- Laboratory of Immunoendocrinology, School of Pharmaceutical Sciences, Department of Clinical and Toxicological Analyses, University of São Paulo, São Paulo, SP, Brazil
| | - Josiane B. Assis
- Laboratory of Experimental Immunology, Institute of Biomedical Sciences, Department of Immunology, University of São Paulo, São Paulo, SP, Brazil
| | - João P. T. Guimarães
- Laboratory of Immunoendocrinology, School of Pharmaceutical Sciences, Department of Clinical and Toxicological Analyses, University of São Paulo, São Paulo, SP, Brazil
| | - Emanuella S. A. Sousa
- Laboratory of Immunoendocrinology, School of Pharmaceutical Sciences, Department of Clinical and Toxicological Analyses, University of São Paulo, São Paulo, SP, Brazil
| | - Anália C. Milhomem
- Institute of Tropical Pathology and Public Health, Department of Microbiology, Immunology, Parasitology and Pathology, Federal University of Goiás, Goiânia, GO, Brazil
| | - Karen K. S. Sunahara
- Experimental Physiopathology, Department of Sciences/Experimental Physiopathology, Medical School, University of São Paulo, São Paulo, SP, Brazil
| | - Anderson Sá-Nunes
- Laboratory of Experimental Immunology, Institute of Biomedical Sciences, Department of Immunology, University of São Paulo, São Paulo, SP, Brazil
| | - Joilson O. Martins
- Laboratory of Immunoendocrinology, School of Pharmaceutical Sciences, Department of Clinical and Toxicological Analyses, University of São Paulo, São Paulo, SP, Brazil
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10
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Imai M, Kawakami F, Kubo M, Kanzaki M, Maruyama H, Kawashima R, Maekawa T, Kurosaki Y, Kojima F, Ichikawa T. LRRK2 Inhibition Ameliorates Dexamethasone-Induced Glucose Intolerance via Prevents Impairment in GLUT4 Membrane Translocation in Adipocytes. Biol Pharm Bull 2021; 43:1660-1668. [PMID: 33132310 DOI: 10.1248/bpb.b20-00377] [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] [Indexed: 11/22/2022]
Abstract
Mutations in the leucine-rich repeat kinase 2 (LRRK2) gene are associated with Parkinson's disease. LRRK2 is a large protein with multiple functional domains, including a guanosine 5'-triphosphate (GTP)-binding domain and a protein kinase domain. Recent studies indicated that the members of the Rab GTPase family, Rab8a and Rab10, which are involved in the membrane transport of the glucose transporter type 4 (GLUT4) during insulin-dependent glucose uptake, are phosphorylated by LRRK2. However, the physiological role of LRRK2 in the regulation of glucose metabolism is largely unknown. In the present study, we investigated the role of LRRK2 using dexamethasone (DEX)-induced glucose intolerance in mice. LRRK2 knockout (KO) mice exhibited suppressed glucose intolerance, even after treatment with DEX. The phosphorylation of LRRK2, Rab8a and Rab10 was increased in the adipose tissues of DEX-treated wild-type mice. In addition, inhibition of the LRRK2 kinase activity prevented the DEX-induced inhibition of GLUT4 membrane translocation and glucose uptake in cultured 3T3-L1 adipocytes. These results suggest that LRRK2 plays an important role in glucose metabolism in adipose tissues.
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Affiliation(s)
- Motoki Imai
- Department of Regulation Biochemistry, Graduate School of Medical Sciences, Kitasato University
| | - Fumitaka Kawakami
- Department of Regulation Biochemistry, Graduate School of Medical Sciences, Kitasato University.,Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science
| | - Makoto Kubo
- Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science.,Division of Clinical Immunology, Graduate School of Medical Sciences, Kitasato University
| | - Makoto Kanzaki
- Department of Biomedical Engineering, Graduate School of Biomedical Engineering, Tohoku University
| | - Hiroko Maruyama
- Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science.,Department of Cytopathology, Graduate School of Medical Sciences, Kitasato University
| | - Rei Kawashima
- Department of Regulation Biochemistry, Graduate School of Medical Sciences, Kitasato University.,Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science
| | - Tatsunori Maekawa
- Department of Regulation Biochemistry, Graduate School of Medical Sciences, Kitasato University.,Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science
| | - Yoshifumi Kurosaki
- Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science.,Department of Medical Laboratory Sciences, Kitasato University School of Allied Health Sciences
| | - Fumiaki Kojima
- Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science.,Department of Pharmacology, Kitasato University School of Allied Health Sciences
| | - Takafumi Ichikawa
- Department of Regulation Biochemistry, Graduate School of Medical Sciences, Kitasato University.,Research Facility of Regenerative Medicine and Cell Design, Kitasato University School of Allied Health Science
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11
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Chronic glucocorticoid treatment induces hepatic lipid accumulation and hyperinsulinaemia in part through actions on AgRP neurons. Sci Rep 2021; 11:13776. [PMID: 34215821 PMCID: PMC8253818 DOI: 10.1038/s41598-021-93378-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 06/04/2021] [Indexed: 11/08/2022] Open
Abstract
Glucocorticoids (GCs) are widely prescribed anti-inflammatory medicines, but their use can lead to metabolic side-effects. These may occur through direct actions of GCs on peripheral organs, but could also be mediated by the hypothalamic AgRP neurons, which can increase food intake and modify peripheral metabolism. Therefore, the aim of this study was to examine the metabolic effects of chronic treatment with the GC corticosterone (Cort, 75 μg/ml in drinking water) in mice lacking the glucocorticoid receptor (GR) on AgRP neurons. Female AgRP-GR KO mice had delayed onset of Cort-induced hyperphagia. However, AgRP-GR KO had little impact on the increased body weight or adiposity seen with 3 weeks Cort treatment. Cort caused hepatic steatosis in control mice, but in Cort treated female AgRP-GR KO mice there was a 25% reduction in liver lipid content and lower plasma triglycerides. Additionally, Cort treatment led to hyperinsulinaemia, but compared to controls, Cort-treated AgRP-GR KO mice had both lower fasting insulin levels and lower insulin levels during a glucose tolerance test. In conclusion, these data indicate that GCs do act through AgRP neurons to contribute, at least in part, to the adverse metabolic consequences of chronic GC treatment.
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12
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Araujo JEDS, Miguel-dos-Santos R, Macedo FN, Cunha PS, Fontes MT, Murata GM, Lauton-Santos S, Santana-Filho VJ, Silva AMDO, Antoniolli AR, Curi R, Quintans JDSS, Barreto RDSS, Santos MRV, Quintans-Junior LJ, Barreto AS. Effects of high doses of glucocorticoids on insulin-mediated vasodilation in the mesenteric artery of rats. PLoS One 2020; 15:e0230514. [PMID: 32187237 PMCID: PMC7080254 DOI: 10.1371/journal.pone.0230514] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 03/02/2020] [Indexed: 01/11/2023] Open
Abstract
Several pathological conditions predict the use of glucocorticoids for the management of the inflammatory response; however, chronic or high dose glucocorticoid treatment is associated with hyperglycemia, hyperlipidemia, and insulin resistance and can be considered a risk factor for cardiovascular disease. Therefore, we investigated the mechanisms involved in the vascular responsiveness and inflammatory profile of mesenteric arteries of rats treated with high doses of glucocorticoids. Wistar rats were divided into a control (CO) group and a dexamethasone (DEX) group, that received dexamethasone for 7 days (2mg/kg/day, i.p.). Blood samples were used to assess the lipid profile and insulin tolerance. Vascular reactivity to Phenylephrine (Phe) and insulin, and O2•-production were evaluated. The intracellular insulin signaling pathway PI3K/AKT/eNOS and MAPK/ET-1 were investigated. Regarding the vascular inflammatory profile, TNF-α, IL-6, IL-1β and IL-18 were assessed. Dexamethasone-treated rats had decreased insulin tolerance test and endothelium-dependent vasodilation induced by insulin. eNOS inhibition caused vasoconstriction in the DEX group, which was abolished by the ET-A antagonist. Insulin-mediated relaxation in the DEX group was restored in the presence of the O2.- scavenger TIRON. Nevertheless, in the DEX group there was an increase in Phe-induced vasoconstriction. In addition, the intracellular insulin signaling pathway PI3K/AKT/eNOS was impaired, decreasing NO bioavailability. Regarding superoxide anion generation, there was an increase in the DEX group, and all measured proinflammatory cytokines were also augmented in the DEX group. In addition, the DEX-group presented an increase in low-density lipoprotein cholesterol (LDL-c) and total cholesterol (TC) and reduced high-density lipoprotein cholesterol (HDL-c) levels. In summary, treatment with high doses of dexamethasone promoted changes in insulin-induced vasodilation, through the reduction of NO bioavailability and an increase in vasoconstriction via ET-1 associated with generation of O2•- and proinflammatory cytokines.
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Affiliation(s)
- João Eliakim dos S. Araujo
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Rodrigo Miguel-dos-Santos
- Laboratory of Cardiovascular Biology and Oxidative Stress, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | | | - Patrícia S. Cunha
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Milene Tavares Fontes
- Vascular Physiology Laboratory, Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Gilson Masahiro Murata
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Sandra Lauton-Santos
- Laboratory of Cardiovascular Biology and Oxidative Stress, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Valter J. Santana-Filho
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Ana Mara de O. Silva
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Angelo Roberto Antoniolli
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Rui Curi
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Jullyana de S. S. Quintans
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Rosana de S. S. Barreto
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Marcio R. V. Santos
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - Lucindo J. Quintans-Junior
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
| | - André S. Barreto
- Laboratory of Cardiovascular Pharmacology, Department of Physiology, Federal University of Sergipe, Sao Cristovao, Sergipe, Brazil
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13
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ARAUJO JOÃOE, MACEDO FABRÍCION, OLIVEIRA DAVIP, BRITTO RAQUELM, QUINTANS JULLYANAS, BARRETO ROSANAS, SANTOS MARCIOR, QUINTANS-JUNIOR LUCINDOJ, BARRETO ANDRÉS. Resistance training prevents the reduction of insulin-mediated vasodilation in the mesenteric artery of dexamethasone-treated rats. AN ACAD BRAS CIENC 2020; 92:e20200316. [DOI: 10.1590/0001-3765202020200316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 07/22/2020] [Indexed: 12/30/2022] Open
Affiliation(s)
- JOÃO E.S. ARAUJO
- Universidade Federal de Sergipe, Brazil; Programa de Pós-Graduação em Ciências da Saúde, Brazil; Universidade Tiradentes, Brazil
| | | | | | | | - JULLYANA S.S. QUINTANS
- Universidade Federal de Sergipe, Brazil; Programa de Pós-Graduação em Ciências da Saúde, Brazil
| | - ROSANA S.S. BARRETO
- Universidade Federal de Sergipe, Brazil; Programa de Pós-Graduação em Ciências da Saúde, Brazil
| | - MARCIO R.V. SANTOS
- Universidade Federal de Sergipe, Brazil; Programa de Pós-Graduação em Ciências da Saúde, Brazil
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14
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Camaforte NADP, Saldanha LL, Vareda PMP, Rezende-Neto JM, Senger MR, Delgado AQ, Morgan HJN, Violato NM, Pieroni LG, Dokkedal AL, Silva-Júnior FP, Bosqueiro JR. Hypoglycaemic activity of Bauhinia holophylla through GSK3-β inhibition and glycogenesis activation. PHARMACEUTICAL BIOLOGY 2019; 57:269-279. [PMID: 31007116 PMCID: PMC6493280 DOI: 10.1080/13880209.2019.1599962] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Revised: 03/07/2019] [Accepted: 03/21/2019] [Indexed: 06/09/2023]
Abstract
CONTEXT Bauhinia L. species, including Bauhinia holophylla (Bong.) Steud. (Fabaceae), have traditionally been used to treat diabetes. Bauhinia is a complex botanical genus, and the indiscriminate use of the diverse Bauhinia species is reflected in the experimental divergence of their medicinal potential. OBJECTIVE The hypoglycaemic and hypolipidaemic effects, molecular mechanism of action and phytochemical properties of an authentic extract of B. holophylla leaves were evaluated. MATERIALS AND METHODS A phytochemical study of a 70% EtOH extract was performed using FIA-ESI-IT-MS/MSn and HPLC-PAD-ESI-IT-MS. The extract (200 or 400 mg/kg b.w.) was administered for 14 days to streptozotocin-induced diabetic Swiss mice. Glucose tolerance and insulin sensitivity, blood parameters, gene and protein expression, and the in vivo and in vitro inhibition of intestinal glucosidases were assessed. RESULTS HPLC-PAD-ESI-IT-MS analysis identified flavonoid derivatives of quercetin, myricetin, luteolin and kaempferol. Treatment with 400 mg/kg of the extract reduced blood glucose (269.0 ± 32.4 mg/dL vs. 468.0 ± 32.2 mg/dL for diabetic animals), improved glucose tolerance, decreased cholesterol and triglyceride levels, and increased the mRNA expression of proteins involved in glucogenesis in the liver and muscle, such as PI3-K/Akt, GS, GSK3-β (ser-9), AMPK and Glut4. The activity of intestinal maltase was inhibited in vitro (IC50: 43.0 µg/mL for the extract compared to 516.4 µg/mL for acarbose) and in vivo. DISCUSSION AND CONCLUSIONS Treatment with B. holophylla was associated with a marked hypoglycaemic effect through the stimulation of glycogenesis and inhibition of gluconeogenesis and intestinal glucose absorption, without increasing basal insulinaemia.
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Affiliation(s)
| | | | | | - João M. Rezende-Neto
- Laboratory of Experimental and Computational Biochemistry of Drugs, Oswaldo Cruz Institute (FIOCRUZ), Rio de Janeiro, Brazil
| | - Mario R. Senger
- Laboratory of Experimental and Computational Biochemistry of Drugs, Oswaldo Cruz Institute (FIOCRUZ), Rio de Janeiro, Brazil
| | - Aislan Q. Delgado
- Institute of Biosciences, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Henrique J. N. Morgan
- Department of Biological Sciences, São Paulo State University, Bauru, São Paulo, Brazil
| | | | - Laís Goyos Pieroni
- Institute of Biosciences, São Paulo State University, Botucatu, São Paulo, Brazil
| | - Anne Lígia Dokkedal
- Department of Biological Sciences, São Paulo State University, Bauru, São Paulo, Brazil
| | - Floriano P. Silva-Júnior
- Laboratory of Experimental and Computational Biochemistry of Drugs, Oswaldo Cruz Institute (FIOCRUZ), Rio de Janeiro, Brazil
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15
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de Oliveira LCS, Telles PVN, E Sousa JFR, Cavalcante AKM, Wong DVT, Lima-Junior RC, Torres-Leal FL, Dos Santos AA, da Silva MTB. Influence of the physical exercise on decrease in the gastric emptying and alter appetite and food behavior in rats dexamethasone-treatment. Physiol Behav 2019; 209:112610. [PMID: 31299373 DOI: 10.1016/j.physbeh.2019.112610] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 06/05/2019] [Accepted: 07/08/2019] [Indexed: 02/06/2023]
Abstract
The chronic use of Dexamethasone (Dex) induced hyperglycemia and insulin resistance. On the other hand, physical exercise attenuates the symptoms induced by Dex in many physiological systems. However, the effect of the exercise on the changes in gastric motility induced by dexamethasone remains unknown. We hypothesized that low-intensity aerobic exercise modulates the metabolic effects induced by Dex-treatment by modifying the gastrointestinal function and feeding behavior in rats. Male rats were distributed into the following groups: Control (Ctrl), Dex (1.0 mg/kg, i.p.), Exercise (Ctrl + Exercise 5%) and (Dex1.0 + Exercise 5%). The exercise protocol was swimming for 5 consecutive days. We assessed the murinometric and nutritional indices, food intake, blood glucose by (ipGTT) and the gastric emptying rate of a liquid test meal were assessed in all rats. We observed a significant decrease (p < .05) in the gastric emptying in Dex1.0 group in relation to Ctrl group. The exercise prevented decrease in the gastric emptying (p < .05) in Dex1.0 + EX5% group when compared with Dex1.0 groups. The Dex1.0 group induced a significantly increase (p < .05) in glycaemia vs Ctrl group. The hyperglycemia was improving (p < .05) in the Dex1.0 + Ex5% compared with Dex1.0 groups. We observed a positive correlation (p < .05, and r = 0.7065) between gastric retention vs glycaemia in the Dex1.0 groups. The Dex1.0 reduced (p < .05) the body weight and altered body composition, promoting hypophagia. IL-6 increased (p < .05) at gastric fundus in Ex5% compared with Ctrl groups. In conclusion, the use of Dex1.0 decreases gastric emptying, promotes hyperglycemia and modifies feeding behavior. The low-intensity exercise prevents hyperglycemia, thus improving gastric dysmotility without improving the anthropometric parameters.
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Affiliation(s)
| | | | | | | | - Deysi Viviana Tenazoa Wong
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Roberto Cesar Lima-Junior
- Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Francisco Leonardo Torres-Leal
- Graduate Program in Food and Nutrition, Federal University of Piauí, Teresina, PI, Brazil; Graduate Program in Pharmacology, Federal University of Piauí, Teresina, PI, Brazil
| | - Armenio Aguiar Dos Santos
- Graduate Program in Medical Sciences, Federal University of Ceará, Fortaleza, CE, Brazil; Department of Physiology and Pharmacology, School of Medicine, Federal University of Ceará, Fortaleza, CE, Brazil
| | - Moisés Tolentino Bento da Silva
- Graduate Program in Food and Nutrition, Federal University of Piauí, Teresina, PI, Brazil; Department of Physical Education, Federal University of Piauí, Teresina, PI, Brazil; Graduate Program in Pharmacology, Federal University of Piauí, Teresina, PI, Brazil.
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16
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Courty E, Besseiche A, Do TTH, Liboz A, Aguid FM, Quilichini E, Buscato M, Gourdy P, Gautier JF, Riveline JP, Haumaitre C, Buyse M, Fève B, Guillemain G, Blondeau B. Adaptive β-Cell Neogenesis in the Adult Mouse in Response to Glucocorticoid-Induced Insulin Resistance. Diabetes 2019; 68:95-108. [PMID: 30327384 DOI: 10.2337/db17-1314] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 10/11/2018] [Indexed: 11/13/2022]
Abstract
Both type 1 and type 2 diabetes are characterized by deficient insulin secretion and decreased β-cell mass. Thus, regenerative strategies to increase β-cell mass need to be developed. To characterize mechanisms of β-cell plasticity, we studied a model of severe insulin resistance in the adult mouse and defined how β-cells adapt. Chronic corticosterone (CORT) treatment was given to adult mice and led to rapid insulin resistance and adaptive increased insulin secretion. Adaptive and massive increase of β-cell mass was observed during treatment up to 8 weeks. β-Cell mass increase was partially reversible upon treatment cessation and reinduced upon subsequent treatment. β-Cell neogenesis was suggested by an increased number of islets, mainly close to ducts, and increased Sox9 and Ngn3 mRNA levels in islets, but lineage-tracing experiments revealed that neoformed β-cells did not derive from Sox9- or Ngn3-expressing cells. CORT treatment after β-cell depletion partially restored β-cells. Finally, β-cell neogenesis was shown to be indirectly stimulated by CORT because serum from CORT-treated mice increased β-cell differentiation in in vitro cultures of pancreatic buds. Altogether, the results present a novel model of β-cell neogenesis in the adult mouse and identify the presence of neogenic factors in the serum of CORT-treated mice.
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Affiliation(s)
- Emilie Courty
- Sorbonne Université, INSERM, Saint-Antoine Research Center, Paris, France
- Hospitalo-Universitary Institute, ICAN, Paris, France
| | - Adrien Besseiche
- Sorbonne Université, INSERM, Centre de Recherche des Cordeliers, Paris, France
| | - Thi Thu Huong Do
- Sorbonne Université, INSERM, Saint-Antoine Research Center, Paris, France
- Hospitalo-Universitary Institute, ICAN, Paris, France
| | - Alexandrine Liboz
- Sorbonne Université, INSERM, Saint-Antoine Research Center, Paris, France
- Hospitalo-Universitary Institute, ICAN, Paris, France
| | | | - Evans Quilichini
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine, Paris, France
| | - Melissa Buscato
- Institute of Metabolic and Cardiovascular Diseases, UMR1048, INSERM, UPS, Université de Toulouse, Toulouse, France
| | - Pierre Gourdy
- Institute of Metabolic and Cardiovascular Diseases, UMR1048, INSERM, UPS, Université de Toulouse, Toulouse, France
- Service de Diabétologie, CHU de Toulouse, Toulouse, France
| | - Jean-François Gautier
- Sorbonne Université, INSERM, Centre de Recherche des Cordeliers, Paris, France
- Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris, Department of Diabetes and Endocrinology, University Paris-Diderot 7, Sorbonne Paris Cité, Paris, France
| | - Jean-Pierre Riveline
- Sorbonne Université, INSERM, Centre de Recherche des Cordeliers, Paris, France
- Lariboisière Hospital, Assistance Publique-Hôpitaux de Paris, Department of Diabetes and Endocrinology, University Paris-Diderot 7, Sorbonne Paris Cité, Paris, France
| | - Cécile Haumaitre
- Sorbonne Université, CNRS, Institut de Biologie Paris-Seine, Paris, France
| | - Marion Buyse
- Sorbonne Université, INSERM, Saint-Antoine Research Center, Paris, France
- Hospitalo-Universitary Institute, ICAN, Paris, France
- Université Paris-Sud, EA 4123, Chatenay-Malabry, France
- Department of Pharmacy, Saint-Antoine Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Bruno Fève
- Sorbonne Université, INSERM, Saint-Antoine Research Center, Paris, France
- Hospitalo-Universitary Institute, ICAN, Paris, France
- Department of Endocrinology, Saint-Antoine Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Ghislaine Guillemain
- Sorbonne Université, INSERM, Saint-Antoine Research Center, Paris, France
- Hospitalo-Universitary Institute, ICAN, Paris, France
| | - Bertrand Blondeau
- Sorbonne Université, INSERM, Saint-Antoine Research Center, Paris, France
- Hospitalo-Universitary Institute, ICAN, Paris, France
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Motta K, Gomes PRL, Sulis PM, Bordin S, Rafacho A. Dexamethasone Administration During Late Gestation Has No Major Impact on Lipid Metabolism, but Reduces Newborn Survival Rate in Wistar Rats. Front Physiol 2018; 9:783. [PMID: 30018561 PMCID: PMC6038799 DOI: 10.3389/fphys.2018.00783] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 06/05/2018] [Indexed: 12/13/2022] Open
Abstract
A rise in plasma triacylglycerol levels is a common physiological occurrence during late gestation and excess of glucocorticoids (GCs) has been shown to impair lipid metabolism. Based on those observations, we investigated whether the administration of dexamethasone during the late gestational period could exacerbate this pregnancy associated hypertriacylglycerolemia in rats. For this, female Wistar rats were treated with dexamethasone (0.2 mg/kg of body mass in the drinking water on days 14-19 of pregnancy; DP group) or equivalent days in the virgin rats (DV group). Untreated pregnant rats (control pregnant group) and age-matched virgin rats (control virgin group) were used as controls. Functional, biochemical, and molecular analyses were carried out after treatment with GC and in the control groups. Euthanasia was performed on day 20 of pregnancy. The metabolic parameters of the mothers (dams) at the time of weaning and 6 months later, as well as newborn survival, were evaluated. We observed that neither dexamethasone nor pregnancy affected blood glucose or glucose tolerance. Hypertriacylglycerolemia associated with lipid intolerance or reduced hepatic triacylglycerol clearance was observed during the late gestational period. GC treatment caused a further increase in basal plasma triacylglycerol levels, but did not have a significant effect on lipid tolerance and hepatic triacylglycerol clearance in pregnant rats. GC, but not pregnancy, caused few significant changes in mRNA expression of proteins involved in lipid metabolism. Dexamethasone during pregnancy had no impact on lipid metabolism later in the dams' life; however, it led to intra-uterine growth restriction and reduced pup survival rate. In conclusion, GC exposure during the late gestational period in rats has no major impact on maternal lipid homeostasis, soon after parturition at weaning, or later in the dams' life, but GC exposure is deleterious to the newborn when high doses are administered at late gestation. These data highlight the importance of performing an individualized and rigorous control of a GC treatment during late pregnancy considering its harmful impact on the fetuses' health.
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Affiliation(s)
- Katia Motta
- Multicenter Postgraduate Program in Physiological Sciences, Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Patricia R L Gomes
- Department of Physiology and Biophysics, Biomedical Sciences Institute, University of São Paulo, São Paulo, Brazil
| | - Paola M Sulis
- Multicenter Postgraduate Program in Physiological Sciences, Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, Brazil
| | - Silvana Bordin
- Department of Physiology and Biophysics, Biomedical Sciences Institute, University of São Paulo, São Paulo, Brazil
| | - Alex Rafacho
- Multicenter Postgraduate Program in Physiological Sciences, Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina, Florianópolis, Brazil
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Graziadio C, Hasenmajer V, Venneri MA, Gianfrilli D, Isidori AM, Sbardella E. Glycometabolic Alterations in Secondary Adrenal Insufficiency: Does Replacement Therapy Play a Role? Front Endocrinol (Lausanne) 2018; 9:434. [PMID: 30123187 PMCID: PMC6085438 DOI: 10.3389/fendo.2018.00434] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 07/13/2018] [Indexed: 02/01/2023] Open
Abstract
Secondary adrenal insufficiency (SAI) is a potentially life-threatening endocrine disorder due to an impairment of corticotropin (ACTH) secretion from any process affecting the hypothalamus or pituitary gland. ACTH deficit can be isolated or associated with other pituitary failures (hypopituitarism). An increased mortality due to cardiovascular, metabolic, and infectious diseases has been described in both primary and secondary adrenal insufficiency. However, few studies have provided compelling evidences on the underlying mechanism in SAI, because of the heterogeneity of the condition. Recently, some studies suggested that inappropriate glucocorticoid (GCs) replacement therapy, as for dose and/or timing of administration, may play a role. Hypertension, insulin resistance, weight gain, visceral obesity, increased body mass index, metabolic syndrome, impaired glucose tolerance, diabetes mellitus, dyslipidemia have all been associated with GC excess. These conditions are particularly significant when SAI coexists with other pituitary alterations, such as growth hormone deficiency, hypogonadism, and residual tumor. Novel regimen schemes and GC preparations have been introduced to improve compliance and better mimick endogenous cortisol rhythm. The controlled trials on the improved replacement therapies, albeit in the short-term, show some beneficial effects on cardiovascular risk, glucose metabolism, and quality of life. This review examines the current evidence from the available clinical trials investigating the association between different glucocorticoid replacement therapies (type, dose, frequency, and timing of treatment) and glycometabolic alterations in SAI.
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19
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Chronic low-dose glucocorticoid treatment increases subcutaneous abdominal fat, but not visceral fat, of male Wistar rats. Life Sci 2017; 190:29-35. [DOI: 10.1016/j.lfs.2017.09.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 09/13/2017] [Accepted: 09/24/2017] [Indexed: 11/19/2022]
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20
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Kou H, Wang GH, Pei LG, Zhang L, Shi C, Guo Y, Wu DF, Wang H. Effects of prenatal caffeine exposure on glucose homeostasis of adult offspring rats. THE SCIENCE OF NATURE - NATURWISSENSCHAFTEN 2017; 104:89. [DOI: 10.1007/s00114-017-1510-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 08/30/2017] [Accepted: 09/30/2017] [Indexed: 10/18/2022]
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21
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Ferreira GN, Rossi-Valentim R, Buzelle SL, Paula-Gomes S, Zanon NM, Garófalo MAR, Frasson D, Navegantes LCC, Chaves VE, Kettelhut IDC. Differential regulation of glyceroneogenesis by glucocorticoids in epididymal and retroperitoneal white adipose tissue from rats. Endocrine 2017; 57:287-297. [PMID: 28555305 DOI: 10.1007/s12020-017-1315-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Accepted: 04/29/2017] [Indexed: 01/03/2023]
Abstract
PURPOSE Investigate the glycerol-3-phosphate generation pathways in epididymal (EPI) and retroperitoneal (RETRO) adipose tissues from dexamethasone-treated rats. METHODS Rats were treated with dexamethasone for 7 days. Glycerol-3-phosphate generation pathways via glycolysis, glyceroneogenesis and direct phosphorylation of glycerol were evaluated, respectively, by 2-deoxyglucose uptake, phosphoenolpyruvate carboxykinase (PEPCK-C) activity and pyruvate incorporation into triacylglycerol (TAG)-glycerol, and glycerokinase activity and glycerol incorporation into TAG-glycerol. RESULTS Dexamethasone treatment markedly decreased the body weight, but increased the weight and lipid content of EPI and RETRO and plasma insulin, glucose, non-esterified fatty acid and TAG levels. EPI and RETRO from dexamethasone-treated rats showed increased rates of de novo fatty acid synthesis (80 and 100%) and basal lipolysis (20%). In EPI, dexamethasone decreased the 2-deoxyglucose uptake (50%), as well as glyceroneogenesis, evidenced by a decrease of PEPCK-C activity (39%) and TAG-glycerol synthesis from pyruvate (66%), but increased the glycerokinase activity (50%) and TAG-glycerol synthesis from glycerol (72%) in this tissue. In spite of a similar reduction in 2-deoxyglucose uptake in RETRO, dexamethasone treatment increased glyceroneogenesis, evidenced by PEPCK activity (96%), and TAG-glycerol synthesis from pyruvate (110%), accompanied by a decrease in glycerokinase activity (50%) and TAG-glycerol synthesis from glycerol (50%). Dexamethasone effects on RETRO were accompanied by a decrease in p-Akt content and by lower insulin effects on the rates of glycerol release in the presence of isoproterenol and on the rates of glucose uptake in isolated adipocytes. CONCLUSION Our data demonstrated differential regulation of glyceroneogenesis and direct phosphorylation of glycerol by glucocorticoids in EPI and RETRO from rats.
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Affiliation(s)
- Graziella Nascimento Ferreira
- Departments of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Rafael Rossi-Valentim
- Departments of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Samyra Lopes Buzelle
- Biochemistry-Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Sílvia Paula-Gomes
- Biochemistry-Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Neusa Maria Zanon
- Departments of Physiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | | | - Danúbia Frasson
- Latin American Institute of Life and Nature Science, Federal University of Latin American Integration, Foz do Iguaçu, Paraná, Brazil
| | | | - Valéria Ernestânia Chaves
- Laboratory of Physiology, Federal University of São João del-Rei, Divinópolis, Minas Gerais, Brazil.
| | - Isis do Carmo Kettelhut
- Biochemistry-Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
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22
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Cohen DM, Steger DJ. Nuclear Receptor Function through Genomics: Lessons from the Glucocorticoid Receptor. Trends Endocrinol Metab 2017; 28:531-540. [PMID: 28495406 PMCID: PMC5505657 DOI: 10.1016/j.tem.2017.04.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Revised: 04/14/2017] [Accepted: 04/18/2017] [Indexed: 12/20/2022]
Abstract
Unlocking the therapeutic potential of the glucocorticoid receptor (GR) has motivated a search for small molecules that selectively modulate its ability to activate or repress gene transcription. Recently, breakthrough studies in the field of genomics have reinvigorated debate over longstanding transcriptional models explaining how GR controls tissue-specific gene expression. Here, we highlight these genomic studies with the dual goals of advancing understanding of nuclear receptor-mediated transcription and stimulating thought on the development of anti-inflammatory and immunosuppressive ligands for GR that have reduced harmful effects on metabolism.
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Affiliation(s)
- Daniel M Cohen
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, and The Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - David J Steger
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, and The Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
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23
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Battiston FG, Dos Santos C, Barbosa AM, Sehnem S, Leonel ECR, Taboga SR, Anselmo-Franci JA, Lima FB, Rafacho A. Glucose homeostasis in rats treated with 4-vinylcyclohexene diepoxide is not worsened by dexamethasone treatment. J Steroid Biochem Mol Biol 2017; 165:170-181. [PMID: 27264932 DOI: 10.1016/j.jsbmb.2016.06.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Revised: 05/31/2016] [Accepted: 06/01/2016] [Indexed: 12/19/2022]
Abstract
4-vinilcyclohexene diepoxide (4-VCD) causes premature ovarian failure and may result in estrogen deficiency, characterizing the transition to estropause in rodents (equivalent to menopause in women). Estropause/menopause is associated with metabolic derangements such as glucose intolerance and insulin resistance. Glucocorticoids (GCs) are known to exert diabetogenic effects. Thus, we aimed to investigate whether rats with premature ovarian failure are more prone to the diabetogenic effects of GC. For this, immature female rats received daily injections of 4-VCD [160mg/kg body weight (b.w.), intraperitoneally (i.p.)] for 15 consecutive days, whereas control rats received vehicle. After 168days of the completion of 4-VCD administration, rats were divided into 4 groups: CTL-received daily injections of saline (1mL/kg, b.w., i.p.) for 5days; DEX-received daily injections of dexamethasone (1mg/kg, b.w., i.p.) for 5days; VCD-treated as CTL group; VCD+DEX-treated as DEX group. Experiments and euthanasia occurred one day after the last dexamethasone injection. 4-VCD-treated rats exhibited ovary hypotrophy and reduced number of preantral follicles (p<0.05). Premature ovarian failure had no impact on the body weight gain or food intake, but both were reduced by the effects of dexamethasone. The increase in blood glucose, plasma insulin and triacylglycerol levels as well as the reduction in insulin sensitivity caused by dexamethasone treatment was not exacerbated in the VCD+DEX group of rats. Premature ovarian failure did change neither the hepatic content of glycogen and triacylglycerol nor the glycerol release from perigonadal adipose tissue. Glucose intolerance was observed in the VCD group after an ipGTT (p<0.05), but not after an oral glucose challenge. Glucose intolerance and compensatory pancreatic β-cell mass caused by GC were not modified by ovarian failure in the VCD+DEX group. We conclude that reduced ovarian function has no major implications on the diabetogenic effects promoted by GC treatment, indicating that other factors related to aging may make rats more vulnerable to GC side effects on glucose metabolism.
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Affiliation(s)
- Francielle Garghetti Battiston
- Department of Physiological Sciences and Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina-UFSC, Florianópolis, Brazil
| | - Cristiane Dos Santos
- Department of Physiological Sciences and Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina-UFSC, Florianópolis, Brazil
| | - Amanda Marreiro Barbosa
- Department of Physiological Sciences and Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina-UFSC, Florianópolis, Brazil
| | - Sibele Sehnem
- Department of Physiological Sciences and Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina-UFSC, Florianópolis, Brazil
| | - Ellen Cristina Rivas Leonel
- Department of Biology, Institute of Biosciences, Letters and Exact Sciences, Univ. Estadual Paulista-IBILCE/UNESP, São José do Rio Preto, SP, Brazil
| | - Sebastião Roberto Taboga
- Department of Biology, Institute of Biosciences, Letters and Exact Sciences, Univ. Estadual Paulista-IBILCE/UNESP, São José do Rio Preto, SP, Brazil
| | - Janete A Anselmo-Franci
- Department of Morphology, Center of Biological Sciences, School of Dentistry of Ribeirão Preto, São Paulo University-USP, Ribeirão Preto, SP, Brazil
| | - Fernanda Barbosa Lima
- Department of Physiological Sciences and Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina-UFSC, Florianópolis, Brazil
| | - Alex Rafacho
- Department of Physiological Sciences and Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina-UFSC, Florianópolis, Brazil.
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24
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Wong SK, Chin KY, Suhaimi FH, Fairus A, Ima-Nirwana S. Animal models of metabolic syndrome: a review. Nutr Metab (Lond) 2016; 13:65. [PMID: 27708685 PMCID: PMC5050917 DOI: 10.1186/s12986-016-0123-9] [Citation(s) in RCA: 213] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 09/10/2016] [Indexed: 01/11/2023] Open
Abstract
Metabolic syndrome (MetS) consists of several medical conditions that collectively predict the risk for cardiovascular disease better than the sum of individual conditions. The risk of developing MetS in human depends on synergy of both genetic and environmental factors. Being a multifactorial condition with alarming rate of prevalence nowadays, establishment of appropriate experimental animal models mimicking the disease state in humans is crucial in order to solve the difficulties in evaluating the pathophysiology of MetS in human. This review aims to summarize the underlying mechanisms involved in the pathophysiology of dietary, genetic, and pharmacological models of MetS. Furthermore, we will discuss the usefulness, suitability, pros and cons of these animal models. Even though numerous animal models of MetS have been established, further investigations on the invention of new animal model and clarification of plausible mechanisms are still necessary to confer a better understanding to researchers on the selection of animal models for their studies.
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Affiliation(s)
- Sok Kuan Wong
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaakob Latif, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur Malaysia
| | - Kok-Yong Chin
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaakob Latif, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur Malaysia
| | - Farihah Hj Suhaimi
- Department of Anatomy, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaakob Latif, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur Malaysia
| | - Ahmad Fairus
- Department of Anatomy, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaakob Latif, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur Malaysia
| | - Soelaiman Ima-Nirwana
- Department of Pharmacology, Faculty of Medicine, Universiti Kebangsaan Malaysia, Jalan Yaakob Latif, Bandar Tun Razak, 56000 Cheras, Kuala Lumpur Malaysia
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25
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Pinto-Fochi ME, Pytlowanciv EZ, Reame V, Rafacho A, Ribeiro DL, Taboga SR, Góes RM. A high-fat diet fed during different periods of life impairs steroidogenesis of rat Leydig cells. Reproduction 2016; 152:795-808. [PMID: 27679864 DOI: 10.1530/rep-16-0072] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 09/27/2016] [Indexed: 01/22/2023]
Abstract
This study evaluated the impact of a high-fat diet (HFD) during different stages of rat life, associated or not with maternal obesity, on the content of sex steroid hormones and morphophysiology of Leydig cells. The following periods of development were examined: gestation (O1), gestation and lactation (O2), from weaning to adulthood (O3), from lactation to adulthood (O4), gestation to adulthood (O5), and after sexual maturation (O6). The HFD contained 20% unsaturated fat, whereas the control diet had 4% fat. Maternal obesity was induced by feeding HFD 15 weeks before mating. All HFD groups presented increased body weight, hyperinsulinemia and reduced insulin sensitivity. Except for O1, all HFD groups exhibited a higher adiposity index, hyperleptinemia, reduced testosterone and estradiol testicular levels, and decreased testicular 17β-HSD enzyme . Morphometrical analyses indicated atrophy of Leydig cells in the O2 group. Myelin vesicles were observed in the mitochondrial matrix of Leydig cells in O3, O4, O5 and O6, and autophagosomes containing mitochondria were found in O5 and O6. In conclusion, HFD feeding, before or after sexual maturation, reduces the functional capacity of rat Leydig cells. Maternal obesity associated with HFD during pregnancy/lactation prejudices Leydig cell steroidogenesis and induces its atrophy in adulthood, even if it is replaced by a conventional diet at later stages of life. Regardless of the life period of exposure to HFD, deregulation of leptin is the main factor related to steroidogenic impairment of Leydig cells, and, in groups exposed for longer periods (O3, O4, O5 and O6), this is worsened by structural damage and mitochondrial degeneration of these cells.
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Affiliation(s)
- Maria Etelvina Pinto-Fochi
- Department of BiologyInstitute of Biosciences, Letters and Exact Sciences, Univ Estadual Paulista - IBILCE/UNESP, São José do Rio Preto, São Paulo, Brazil
| | - Eloísa Zanin Pytlowanciv
- Department of BiologyInstitute of Biosciences, Letters and Exact Sciences, Univ Estadual Paulista - IBILCE/UNESP, São José do Rio Preto, São Paulo, Brazil.,Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas, IB/UNICAMP, Campinas, São Paulo, Brazil
| | - Vanessa Reame
- Department of BiologyInstitute of Biosciences, Letters and Exact Sciences, Univ Estadual Paulista - IBILCE/UNESP, São José do Rio Preto, São Paulo, Brazil
| | - Alex Rafacho
- Department of Physiological SciencesFederal University of Santa Catarina, UFSC, Florianópolis, Santa Catarina, Brazil
| | - Daniele Lisboa Ribeiro
- Department of Histology- ICBIMFederal University of Uberlandia, Uberlândia, Minas Gerais, Brazil
| | - Sebastião Roberto Taboga
- Department of BiologyInstitute of Biosciences, Letters and Exact Sciences, Univ Estadual Paulista - IBILCE/UNESP, São José do Rio Preto, São Paulo, Brazil.,Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas, IB/UNICAMP, Campinas, São Paulo, Brazil
| | - Rejane Maira Góes
- Department of BiologyInstitute of Biosciences, Letters and Exact Sciences, Univ Estadual Paulista - IBILCE/UNESP, São José do Rio Preto, São Paulo, Brazil .,Department of Structural and Functional BiologyInstitute of Biology, State University of Campinas, IB/UNICAMP, Campinas, São Paulo, Brazil
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26
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Impact of Glucocorticoid Excess on Glucose Tolerance: Clinical and Preclinical Evidence. Metabolites 2016; 6:metabo6030024. [PMID: 27527232 PMCID: PMC5041123 DOI: 10.3390/metabo6030024] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 07/28/2016] [Accepted: 07/29/2016] [Indexed: 12/28/2022] Open
Abstract
Glucocorticoids (GCs) are steroid hormones that exert important physiological actions on metabolism. Given that GCs also exert potent immunosuppressive and anti-inflammatory actions, synthetic GCs such as prednisolone and dexamethasone were developed for the treatment of autoimmune- and inflammatory-related diseases. The synthetic GCs are undoubtedly efficient in terms of their therapeutic effects, but are accompanied by significant adverse effects on metabolism, specifically glucose metabolism. Glucose intolerance and reductions in insulin sensitivity are among the major concerns related to GC metabolic side effects, which may ultimately progress to type 2 diabetes mellitus. A number of pre-clinical and clinical studies have aimed to understand the repercussions of GCs on glucose metabolism and the possible mechanisms of GC action. This review intends to summarize the main alterations that occur in liver, skeletal muscle, adipose tissue, and pancreatic islets in the context of GC-induced glucose intolerance. For this, both experimental (animals) and clinical studies were selected and, whenever possible, the main cellular mechanisms involved in such GC-side effects were discussed.
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27
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Macedo AG, Krug ALO, Souza LM, Martuscelli AM, Constantino PB, Zago AS, Rush JWE, Santos CF, Amaral SL. Time-course changes of catabolic proteins following muscle atrophy induced by dexamethasone. Steroids 2016; 107:30-6. [PMID: 26730720 DOI: 10.1016/j.steroids.2015.12.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Revised: 12/09/2015] [Accepted: 12/21/2015] [Indexed: 12/25/2022]
Abstract
This study was designed to describe the time-course changes of catabolic proteins following muscle atrophy induced by 10 days of dexamethasone (DEX). Rats underwent DEX treatment for 1, 3, 5, 7 and 10 days. Body weight (BW) and lean mass were obtained using a dual energy X-ray absorptiometry (DEXA) scan. Muscle ringer finger1 (MuRF-1), atrogin-1 and myostatin protein levels were analyzed in the tibialis anterior (TA), flexor hallucis longus (FHL) and soleus muscles. DEX treatment reduced lean mass since day-3 and reduced BW since day-5. Specific muscle weight reductions were observed after day-10 in TA (-23%) and after day-5 in FHL (-16%, -17% and -29%, for days 5, 7 and 10, respectively). In TA, myostatin protein level was 36% higher on day-5 and its values were normalized in comparison with controls on day-10. MuRF-1 protein level was increased in TA muscle from day-7 and in FHL muscle only on day-10. This study suggests that DEX-induced muscle atrophy is a dynamic process which involves important signaling factors over time. As demonstrated by DEXA scan, lean mass declines earlier than BW and this response may involve other catabolic proteins than myostatin and MuRF-1. Specifically for TA and FHL, it seems that myostatin may trigger the catabolic process, and MuRF-1 may contribute to maintain muscle atrophy. This information may support any intervention in order to attenuate the muscle atrophy during long period of treatment.
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Affiliation(s)
- Anderson G Macedo
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Department of Physiological Sciences, Federal University of São Carlos - UFSCAR, São Carlos, Brazil
| | - André Luis O Krug
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Department of Physiological Sciences, Federal University of São Carlos - UFSCAR, São Carlos, Brazil
| | - Lidiane M Souza
- Department of Physical Education, Universidade Estadual Paulista - UNESP, Bauru, Brazil
| | - Aline M Martuscelli
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Department of Physiological Sciences, Federal University of São Carlos - UFSCAR, São Carlos, Brazil
| | - Paula B Constantino
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Department of Physiological Sciences, Federal University of São Carlos - UFSCAR, São Carlos, Brazil
| | - Anderson S Zago
- Department of Physical Education, Universidade Estadual Paulista - UNESP, Bauru, Brazil
| | - James W E Rush
- Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada
| | - Carlos F Santos
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, USP, Bauru, Brazil
| | - Sandra L Amaral
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Department of Physiological Sciences, Federal University of São Carlos - UFSCAR, São Carlos, Brazil; Department of Physical Education, Universidade Estadual Paulista - UNESP, Bauru, Brazil.
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Barbosa AM, Francisco PDC, Motta K, Chagas TR, Dos Santos C, Rafacho A, Nunes EA. Fish oil supplementation attenuates changes in plasma lipids caused by dexamethasone treatment in rats. Appl Physiol Nutr Metab 2015; 41:382-90. [PMID: 26939043 DOI: 10.1139/apnm-2015-0487] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Dexamethasone is an anti-inflammatory glucocorticoid that may alter glucose and lipid homeostasis when administered in high doses or for long periods of time. Omega-3 fatty acids, present in fish oil (FO), can be used as potential modulators of intermediary glucose and lipid metabolism. Herein, we evaluate the effects of FO supplementation (1 g·kg(-1) body weight (BW)) on glucose and lipid metabolism in rats treated with dexamethasone (0.5 mg·kg(-1) BW) for 15 days. Adult male Wistar rats were distributed among 4 groups: control (saline, 1 mL·kg(-1) BW and mineral oil, 1 g·kg(-1) BW), DEX (dexamethasone and mineral oil), FO (fish oil and saline), and DFO (fish oil and dexamethasone). Dexamethasone and saline were administered intraperitoneally, and fish oil and mineral oil were administered by gavage. We evaluated functional and molecular parameters of lipid and glycemic profiles at 8 days and at the end of treatment. FO supplementation increased hepatic docosahexaenoic acid (DEX: 5.6% ± 0.7%; DFO: 10.5% ± 0.8%) and eicosapentaenoic acid (DEX: 0.3% ± 0.0%; DFO: 1.3% ± 0.1%) contents and attenuated the increase of plasma triacylglycerol, total cholesterol, and non-high-density lipoprotein cholesterol concentrations in DFO rats compared with DEX rats. These effects seem not to depend on hepatic expression of insulin receptor substrate 1, protein kinase B, peroxisome proliferator-activated receptor γ coactivator 1-α, and peroxisome proliferator-activated receptor γ. There was no effect of supplementation on body weight loss, fasting glycemia, and glucose tolerance in rats treated with dexamethasone. In conclusion, we show that FO supplementation for 15 days attenuates the dyslipidemia induced by dexamethasone treatment.
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Affiliation(s)
- Amanda Marreiro Barbosa
- a Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil.,b Multicenter Graduate Program in Physiological Sciences, Graduate Program in Nutrition, Center of Health Sciences, UFSC, Florianópolis, Brazil
| | - Priscila de Cássia Francisco
- a Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Katia Motta
- a Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Thayz Rodrigues Chagas
- a Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Cristiane Dos Santos
- a Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Alex Rafacho
- a Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Everson Araújo Nunes
- a Laboratory of Investigation in Chronic Diseases, Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil.,b Multicenter Graduate Program in Physiological Sciences, Graduate Program in Nutrition, Center of Health Sciences, UFSC, Florianópolis, Brazil
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Regulation of Glucose Homeostasis by Glucocorticoids. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2015. [PMID: 26215992 DOI: 10.1007/978-1-4939-2895-8_5] [Citation(s) in RCA: 357] [Impact Index Per Article: 39.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Glucocorticoids are steroid hormones that regulate multiple aspects of glucose homeostasis. Glucocorticoids promote gluconeogenesis in liver, whereas in skeletal muscle and white adipose tissue they decrease glucose uptake and utilization by antagonizing insulin response. Therefore, excess glucocorticoid exposure causes hyperglycemia and insulin resistance. Glucocorticoids also regulate glycogen metabolism. In liver, glucocorticoids increase glycogen storage, whereas in skeletal muscle they play a permissive role for catecholamine-induced glycogenolysis and/or inhibit insulin-stimulated glycogen synthesis. Moreover, glucocorticoids modulate the function of pancreatic α and β cells to regulate the secretion of glucagon and insulin, two hormones that play a pivotal role in the regulation of blood glucose levels. Overall, the major glucocorticoid effect on glucose homeostasis is to preserve plasma glucose for brain during stress, as transiently raising blood glucose is important to promote maximal brain function. In this chapter we will discuss the current understanding of the mechanisms underlying different aspects of glucocorticoid-regulated mammalian glucose homeostasis.
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Motta K, Barbosa AM, Bobinski F, Boschero AC, Rafacho A. JNK and IKKβ phosphorylation is reduced by glucocorticoids in adipose tissue from insulin-resistant rats. J Steroid Biochem Mol Biol 2015; 145:1-12. [PMID: 25268311 DOI: 10.1016/j.jsbmb.2014.09.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 09/15/2014] [Accepted: 09/25/2014] [Indexed: 02/06/2023]
Abstract
OBJECTIVES Peripheral insulin resistance (IR) is one of the main side effects caused by glucocorticoid (GC)-based therapies, and the molecular mechanisms of GC-induced IR are not yet fully elucidated. Thus, we aimed to investigate the effects of dexamethasone treatment on the main components of insulin and inflammatory signaling in the adipose tissue of rats. MATERIALS/METHODS Male Wistar rats received daily injections of dexamethasone (1mg/kg body weight (b.w.), intraperitoneally (i.p.)) for 5 days (DEX), whereas control rats received saline (CTL). The metabolic status was investigated, and the epididymal fat fragments were collected for lipolysis and western blot analyses. RESULTS The DEX rats became hyperglycemic, hyperinsulinemic, insulin resistant and glucose intolerant, compared with the CTL rats (P<0.05). The basal glycerol release in the fat fragments was 1.5-fold higher in the DEX rats (P<0.05). The phosphorylation of protein kinase B (PKB) at ser(473) decreased by 44%, whereas, the phosphorylation of insulin receptor substrate (IRS)-1 at ser(307) increased by 93% in the adipose tissue of the DEX rats after an oral bolus of glucose (P<0.05). The basal phosphorylation of c-jun-N-terminal kinase (JNK) and inhibitor of nuclear factor kappa-B (IKKβ) proteins was reduced by 46% and 58%, respectively, in the adipose tissue of the DEX rats (P<0.05). This was paralleled with a significant reduction (47%) in the glucocorticoid receptor (GR) protein content in the adipose tissue of the DEX rats (P<0.05). CONCLUSION The insulin-resistant status of rats induced by dexamethasone administration have PKB and IRS-1 activity attenuated in epididymal fat without increases in the phosphorylation of the proinflammatory signals JNK and IKKβ.
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Affiliation(s)
- Katia Motta
- Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Amanda Marreiro Barbosa
- Graduate Program in Nutrition, Center of Health Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Franciane Bobinski
- Graduate Program in Neurosciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil
| | - Antonio Carlos Boschero
- Graduate Program in Functional and Molecular Biology, Institute of Biology, Campinas State University (UNICAMP), Campinas, Brazil
| | - Alex Rafacho
- Multicenter Graduate Program in Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, Brazil.
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Rafacho A, Ortsäter H, Nadal A, Quesada I. Glucocorticoid treatment and endocrine pancreas function: implications for glucose homeostasis, insulin resistance and diabetes. J Endocrinol 2014; 223:R49-62. [PMID: 25271217 DOI: 10.1530/joe-14-0373] [Citation(s) in RCA: 133] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Glucocorticoids (GCs) are broadly prescribed for numerous pathological conditions because of their anti-inflammatory, antiallergic and immunosuppressive effects, among other actions. Nevertheless, GCs can produce undesired diabetogenic side effects through interactions with the regulation of glucose homeostasis. Under conditions of excess and/or long-term treatment, GCs can induce peripheral insulin resistance (IR) by impairing insulin signalling, which results in reduced glucose disposal and augmented endogenous glucose production. In addition, GCs can promote abdominal obesity, elevate plasma fatty acids and triglycerides, and suppress osteocalcin synthesis in bone tissue. In response to GC-induced peripheral IR and in an attempt to maintain normoglycaemia, pancreatic β-cells undergo several morphofunctional adaptations that result in hyperinsulinaemia. Failure of β-cells to compensate for this situation favours glucose homeostasis disruption, which can result in hyperglycaemia, particularly in susceptible individuals. GC treatment does not only alter pancreatic β-cell function but also affect them by their actions that can lead to hyperglucagonaemia, further contributing to glucose homeostasis imbalance and hyperglycaemia. In addition, the release of other islet hormones, such as somatostatin, amylin and ghrelin, is also affected by GC administration. These undesired GC actions merit further consideration for the design of improved GC therapies without diabetogenic effects. In summary, in this review, we consider the implication of GC treatment on peripheral IR, islet function and glucose homeostasis.
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Affiliation(s)
- Alex Rafacho
- Department of Physiological SciencesCenter of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, BrazilDepartment of Clinical Science and EducationSödersjukhuset, Karolinska Institutet, SE-11883 Stockholm, SwedenInstitute of Bioengineering and the Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM)Miguel Hernández University, University Avenue s/n, 03202, Elche, Spain
| | - Henrik Ortsäter
- Department of Physiological SciencesCenter of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, BrazilDepartment of Clinical Science and EducationSödersjukhuset, Karolinska Institutet, SE-11883 Stockholm, SwedenInstitute of Bioengineering and the Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM)Miguel Hernández University, University Avenue s/n, 03202, Elche, Spain
| | - Angel Nadal
- Department of Physiological SciencesCenter of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, BrazilDepartment of Clinical Science and EducationSödersjukhuset, Karolinska Institutet, SE-11883 Stockholm, SwedenInstitute of Bioengineering and the Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM)Miguel Hernández University, University Avenue s/n, 03202, Elche, Spain
| | - Ivan Quesada
- Department of Physiological SciencesCenter of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900, Florianópolis, SC, BrazilDepartment of Clinical Science and EducationSödersjukhuset, Karolinska Institutet, SE-11883 Stockholm, SwedenInstitute of Bioengineering and the Biomedical Research Center in Diabetes and Associated Metabolic Disorders (CIBERDEM)Miguel Hernández University, University Avenue s/n, 03202, Elche, Spain
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dos Santos C, Ferreira FBD, Gonçalves-Neto LM, Taboga SR, Boschero AC, Rafacho A. Age- and gender-related changes in glucose homeostasis in glucocorticoid-treated rats. Can J Physiol Pharmacol 2014; 92:867-78. [DOI: 10.1139/cjpp-2014-0259] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The disruption to glucose homeostasis upon glucocorticoid (GC) treatment in adult male rats has not been fully characterized in older rats or in females. Thus, we evaluated the age- and gender-related changes in glucose homeostasis in GC-treated rats. We injected male and female rats at 3 months and 12 months of age with either dexamethasone (1.0 mg/kg body mass, intraperitoneally) or saline, daily for 5 days. All of the GC-treated rats had decreased body mass and food intake, and adrenal hypotrophy. Increased glycemia was observed in all of the GC-treated groups and only the 3-month-old female rats were not glucose intolerant. Dexamethasone treatment resulted in hyperinsulinemia and hypertriacylglyceridemia in all of the GC-treated rats. The glucose-stimulated insulin secretion (GSIS) was higher in all of the dexamethasone-treated animals, but it was less pronounced in the older animals. The β-cell mass was increased in the younger male rats treated with dexamethasone. We conclude that dexamethasone treatment induces glucose intolerance in both the 3- and 12-month-old male rats as well as hyperinsulinemia and augmented GSIS. Three-month-old female rats are protected from glucose intolerance caused by GC, whereas 12-month-old female rats developed the same complications that were present in 3- and 12-month-old male rats.
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Affiliation(s)
- Cristiane dos Santos
- Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, Brazil
| | - Francielle Batista D. Ferreira
- Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, Brazil
| | - Luiz M. Gonçalves-Neto
- Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, Brazil
| | - Sebastião Roberto Taboga
- Department of Biology, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), São José do Rio Preto, Brazil
| | - Antonio Carlos Boschero
- Department of Structural and Functional Biology, Institute of Biology, and Obesity and Comorbidities Research Center (OCRC), State University of Campinas (UNICAMP), Campinas, Brazil
| | - Alex Rafacho
- Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, Brazil
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Bighetti BB, d Assis GF, Vieira DC, Violato NM, Cestari TM, Taga R, Bosqueiro JR, Rafacho A. Long-term dexamethasone treatment alters the histomorphology of acinar cells in rat parotid and submandibular glands. Int J Exp Pathol 2014; 95:351-63. [PMID: 25186305 DOI: 10.1111/iep.12092] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 07/21/2014] [Indexed: 11/30/2022] Open
Abstract
Glucocorticoids (GCs) induce insulin resistance (IR), a condition known to alter oral homeostasis. This study investigated the effects of long-term dexamethasone administration on morphofunctional aspects of salivary glands. Male Wistar rats received daily injections of dexamethasone [0.1 mg/kg body weight (b.w.), intraperitoneally] for 10 days (DEX), whereas control rats received saline. Subsequently, glycaemia, insulinaemia, insulin secretion and salivary flow were analysed. The parotid and submandibular glands were collected for histomorphometric evaluation and Western blot experiments. The DEX rats were found to be normoglycaemic, hyperinsulinaemic, insulin resistant and glucose intolerant (P < 0.05). DEX rat islets secreted more insulin in response to glucose (P < 0.05). DEX rats had significant reductions in the masses of the parotid (29%) and submandibular (16%) glands (P < 0.05) that was associated with reduced salivary flux rate. The hypotrophy in both glands observed in the DEX group was associated with marked reduction in the volume of the acinar cells in these glands of 50% and 26% respectively (P < 0.05). The total number of acinar cells was increased in the submandibular glands of the DEX rats (P < 0.05) but not in the parotid glands. The levels of proteins related to insulin and survival signalling in both glands did not differ between the groups. In conclusion, the long-term administration of dexamethasone caused IR, which was associated with significant reductions in both mass and flux rate of the salivary glands. The parotid and submandibular glands exhibited reduced acinar cell volume; however, the submandibular glands displayed acinar hyperplasia, indicating a gland-specific response to GCs. Our data emphasize that GC-based therapies and insulin-resistant states have a negative impact on salivary gland homeostasis.
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Affiliation(s)
- Bruna B Bighetti
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo - USP, Bauru, Brazil
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Macedo AG, Krug ALO, Herrera NA, Zago AS, Rush JWE, Amaral SL. Low-intensity resistance training attenuates dexamethasone-induced atrophy in the flexor hallucis longus muscle. J Steroid Biochem Mol Biol 2014; 143:357-64. [PMID: 24861267 DOI: 10.1016/j.jsbmb.2014.05.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Revised: 05/13/2014] [Accepted: 05/15/2014] [Indexed: 12/25/2022]
Abstract
This study investigated the potential protective effect of low-intensity resistance training (RT) against dexamethasone (DEX) treatment induced muscle atrophy. Rats underwent either an 8 week period of ladder climbing RT or remained sedentary. During the last 10 days of the exercise protocol, animals were submitted to a DEX treatment or a control saline injection. Muscle weights were assessed and levels of AKT, mTOR, FOXO3a, Atrogin-1 and MuRF-1 proteins were analyzed in flexor hallucis longus (FHL), tibialis anterior (TA), and soleus muscles. DEX induced blood glucose increase (+46%), body weight reduction (-19%) and atrophy in FHL (-28%) and TA (-21%) muscles, which was associated with a decrease in AKT and an increase in MuRF-1 proteins levels. Low-intensity RT prevented the blood glucose increase, attenuated the FHL atrophy effects of DEX, and was associated with increased mTOR and reductions in Atrogin-1 and MuRF-1 in FHL. In contrast, TA muscle atrophy and signaling proteins were not affected by RT. These are the first data to demonstrate that low-intensity ladder-climbing RT specifically mitigates the FHL atrophy, which is the main muscle recruited during the training activity, while not preventing atrophy in other limb muscle not as heavily recruited. The recruitment-dependent prevention of atrophy by low intensity RT likely occurs by a combination of attenuated muscle protein degradation signals and enhanced muscle protein synthesis signals including mTOR, Atrogin-1 and MuRF-1.
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Affiliation(s)
- Anderson G Macedo
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Rodovia Washington Luiz, km 235 Monjolinho, 676, São Carlos, SP, Brazil.
| | - André L O Krug
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Rodovia Washington Luiz, km 235 Monjolinho, 676, São Carlos, SP, Brazil.
| | - Naiara A Herrera
- Department of Physical Education - UNESP, Science Faculty, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01 - Vargem Limpa, Bauru, SP, Brazil.
| | - Anderson S Zago
- Department of Physical Education - UNESP, Science Faculty, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01 - Vargem Limpa, Bauru, SP, Brazil
| | - James W E Rush
- Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, Canada.
| | - Sandra L Amaral
- Department of Physical Education - UNESP, Science Faculty, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01 - Vargem Limpa, Bauru, SP, Brazil; Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Rodovia Washington Luiz, km 235 Monjolinho, 676, São Carlos, SP, Brazil.
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Beaudry JL, Riddell MC. Response to 'letter to the editor' by Dr Rafacho. Diabetes Metab Res Rev 2014; 30:122-3. [PMID: 24500991 DOI: 10.1002/dmrr.2472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 09/10/2013] [Indexed: 11/09/2022]
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Rafacho A. Effects of glucocorticoids and exercise on pancreatic β-cell function and diabetes development: comments on Beaudry and Riddel. Diabetes Metab Res Rev 2014; 30:120-1. [PMID: 24500990 DOI: 10.1002/dmrr.2473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 09/10/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Alex Rafacho
- Department of Physiological Sciences, Centre of Biological Sciences, Federal University of Santa Catarina (UFSC), 88040-900 Florianópolis, SC, Brazil
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Protzek AOP, Costa-Júnior JM, Rezende LF, Santos GJ, Araújo TG, Vettorazzi JF, Ortis F, Carneiro EM, Rafacho A, Boschero AC. Augmented β-Cell Function and Mass in Glucocorticoid-Treated Rodents Are Associated with Increased Islet Ir-β /AKT/mTOR and Decreased AMPK/ACC and AS160 Signaling. Int J Endocrinol 2014; 2014:983453. [PMID: 25313308 PMCID: PMC4182854 DOI: 10.1155/2014/983453] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 04/25/2014] [Accepted: 08/17/2014] [Indexed: 12/31/2022] Open
Abstract
Glucocorticoid (GC) therapies may adversely cause insulin resistance (IR) that lead to a compensatory hyperinsulinemia due to insulin hypersecretion. The increased β-cell function is associated with increased insulin signaling that has the protein kinase B (AKT) substrate with 160 kDa (AS160) as an important downstream AKT effector. In muscle, both insulin and AMP-activated protein kinase (AMPK) signaling phosphorylate and inactivate AS160, which favors the glucose transporter (GLUT)-4 translocation to plasma membrane. Whether AS160 phosphorylation is modulated in islets from GC-treated subjects is unknown. For this, two animal models, Swiss mice and Wistar rats, were treated with dexamethasone (DEX) (1 mg/kg body weight) for 5 consecutive days. DEX treatment induced IR, hyperinsulinemia, and dyslipidemia in both species, but glucose intolerance and hyperglycemia only in rats. DEX treatment caused increased insulin secretion in response to glucose and augmented β-cell mass in both species that were associated with increased islet content and increased phosphorylation of the AS160 protein. Protein AKT phosphorylation, but not AMPK phosphorylation, was found significantly enhanced in islets from DEX-treated animals. We conclude that the augmented β-cell function developed in response to the GC-induced IR involves inhibition of the islet AS160 protein activity.
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Affiliation(s)
- André O. P. Protzek
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
| | - José M. Costa-Júnior
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
| | - Luiz F. Rezende
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
| | - Gustavo J. Santos
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
| | - Tiago Gomes Araújo
- School of Medical Sciences, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Jean F. Vettorazzi
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
| | - Fernanda Ortis
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
- Department of Cell and Developmental Biology, Institute of Biomedical Science, University of São Paulo (USP), São Paulo, SP, Brazil
| | - Everardo M. Carneiro
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
| | - Alex Rafacho
- Department of Physiological Sciences, Center of Biological Sciences, Federal University of Santa Catarina (UFSC), Florianópolis, SC, Brazil
| | - Antonio C. Boschero
- Department of Structural and Functional Biology, Institute of Biology, University of Campinas (UNICAMP), P.O. Box 6109, 13083-970 Campinas, SP, Brazil
- *Antonio C. Boschero:
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Fang J, Sukumaran S, DuBois DC, Almon RR, Jusko WJ. Meta-modeling of methylprednisolone effects on glucose regulation in rats. PLoS One 2013; 8:e81679. [PMID: 24312573 PMCID: PMC3847111 DOI: 10.1371/journal.pone.0081679] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Accepted: 10/15/2013] [Indexed: 01/01/2023] Open
Abstract
A retrospective meta-modeling analysis was performed to integrate previously reported data of glucocorticoid (GC) effects on glucose regulation following a single intramuscular dose (50 mg/kg), single intravenous doses (10, 50 mg/kg), and intravenous infusions (0.1, 0.2, 0.3 and 0.4 mg/kg/h) of methylprednisolone (MPL) in normal and adrenalectomized (ADX) male Wistar rats. A mechanistic pharmacodynamic (PD) model was developed based on the receptor/gene/protein-mediated GC effects on glucose regulation. Three major target organs (liver, white adipose tissue and skeletal muscle) together with some selected intermediate controlling factors were designated as important regulators involved in the pathogenesis of GC-induced glucose dysregulation. Assessed were dynamic changes of food intake and systemic factors (plasma glucose, insulin, free fatty acids (FFA) and leptin) and tissue-specific biomarkers (cAMP, phosphoenolpyruvate carboxykinase (PEPCK) mRNA and enzyme activity, leptin mRNA, interleukin 6 receptor type 1 (IL6R1) mRNA and Insulin receptor substrate-1 (IRS-1) mRNA) after acute and chronic dosing with MPL along with the GC receptor (GR) dynamics in each target organ. Upon binding to GR in liver, MPL dosing caused increased glucose production by stimulating hepatic cAMP and PEPCK activity. In adipose tissue, the rise in leptin mRNA and plasma leptin caused reduction of food intake, the exogenous source of glucose input. Down-regulation of IRS-1 mRNA expression in skeletal muscle inhibited the stimulatory effect of insulin on glucose utilization further contributing to hyperglycemia. The nuclear drug-receptor complex served as the driving force for stimulation or inhibition of downstream target gene expression within different tissues. Incorporating information such as receptor dynamics, as well as the gene and protein induction, allowed us to describe the receptor-mediated effects of MPL on glucose regulation in each important tissue. This advanced mechanistic model provides unique insights into the contributions of major tissues and quantitative hypotheses for the multi-factor control of a complex metabolic system.
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Affiliation(s)
- Jing Fang
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, United States of America
| | - Siddharth Sukumaran
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, United States of America
| | - Debra C. DuBois
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, United States of America
- Department of Biological Sciences, University at Buffalo, State University of New York, Buffalo, New York, United States of America
| | - Richard R. Almon
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, United States of America
- Department of Biological Sciences, University at Buffalo, State University of New York, Buffalo, New York, United States of America
| | - William J. Jusko
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, New York, United States of America
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Fransson L, Franzén S, Rosengren V, Wolbert P, Sjöholm Å, Ortsäter H. β-Cell adaptation in a mouse model of glucocorticoid-induced metabolic syndrome. J Endocrinol 2013; 219:231-41. [PMID: 24048967 DOI: 10.1530/joe-13-0189] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Glucocorticoids (GCs) are stress hormones primarily responsible for mobilizing glucose to the circulation. Due to this effect, insulin resistance and glucose intolerance are concerns in patients with endogenous overproduction of GCs and in patients prescribed GC-based therapy. In addition, hypercortisolemic conditions share many characteristics with the metabolic syndrome. This study reports on a thorough characterization, in terms of glucose control and lipid handling, of a mouse model where corticosterone is given via the drinking water. C57BL/6J mice were treated with corticosterone (100 or 25 μg/ml) or vehicle in their drinking water for 5 weeks after which they were subjected to insulin or glucose tolerance tests. GC-treated mice displayed increased food intake, body weight gain, and central fat deposit accumulations. In addition, the GC treatment led to dyslipidemia as well as accumulation of ectopic fat in the liver and skeletal muscle, having a substantial negative effect on insulin sensitivity. Also glucose intolerance and hypertension, both part of the metabolic syndrome, were evident in the GC-treated mice. However, the observed effects of corticosterone were reversed after drug removal. Furthermore, this study reveals insights into β-cell adaptation to the GC-induced insulin resistance. Increased pancreatic islet volume due to cell proliferation, increased insulin secretion capacity, and increased islet chaperone expression were found in GC-treated animals. This model mimics the human metabolic syndrome. It could be a valuable model for studying the complex mechanisms behind the development of the metabolic syndrome and type 2 diabetes, as well as the multifaceted relations between GC excess and disease.
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Affiliation(s)
- Liselotte Fransson
- Department of Clinical Science and Education, Södersjukhuset, Karolinska Institutet, SE-118 83 Stockholm, Sweden Division of Drug Research, Experimental Renal Medicine, Department of Medical and Health Sciences Center of Medical Image Science and Visualization, Linköping University, SE-581 83 Linköping, Sweden Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama, Mobile, Alabama 36688, USA
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Nunes EA, Gonçalves-Neto LM, Ferreira FB, dos Santos C, Fernandes LC, Boschero AC, Calder PC, Rafacho A. Glucose intolerance induced by glucocorticoid excess is further impaired by co-administration with β-hydroxy-β-methylbutyrate in rats. Appl Physiol Nutr Metab 2013; 38:1137-46. [DOI: 10.1139/apnm-2012-0456] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Glucocorticoid (GC) excess alters glucose homeostasis and promotes modifications in murinometric and anthropometric parameters in rodents and humans, respectively. β-hydroxy-β-methylbutyrate (HMB), a leucine metabolite, has been proposed as a nutritional strategy for preventing muscle wasting, but few data regarding its effects on glucose homeostasis are available. Here, we analyzed whether the effects of GC excess on glucose homeostasis may be attenuated or exacerbated by the concomitant ingestion of HMB. Adult Wistar rats (90-days-old) were assigned to four groups: (1) vehicle treated (Ctl), (2) dexamethasone (DEX) treated (Dex), (3) HMB treated (Hmb), and (4) DEX plus HMB treated (DexHmb). Dex groups received DEX (1 mg·kg body weight (BW)−1, intraperitoneal) for 5 consecutive days. HMB groups ingested HMB (320 mg·kg BW−1, oral gavage) for the same 5 days. HMB ingestion did not attenuate the effects of DEX on food intake and body weight loss, changes in masses of several organs, insulin resistance, and glucose intolerance (p > 0.05). In fact, in DexHmb rats, there was increased fasting glycemia and exacerbated glucose intolerance with the main effect attributed to DEX treatment (p < 0.05). HMB exerted no attenuating effect on plasma triacylglycerol levels from DexHmb rats, but it seems to attenuate the lipolysis induced by β-adrenergic stimulation (20 μmol·L−1isoproterenol) in fragments of retroperitoneal adipose tissue from DexHmb rats. Therefore, HMB does not attenuate the diabetogenic characteristics of GC excess. In fact, the data suggest that HMB may exacerbate GC-induced glucose intolerance.
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Affiliation(s)
- Everson A. Nunes
- Department of Physiological Sciences, Centre of Biological Sciences, Federal University of Santa Catarina, 88040-900 Florianópolis, Brazil
| | - Luiz M. Gonçalves-Neto
- Department of Physiological Sciences, Centre of Biological Sciences, Federal University of Santa Catarina, 88040-900 Florianópolis, Brazil
| | - Francielle B.D. Ferreira
- Department of Physiological Sciences, Centre of Biological Sciences, Federal University of Santa Catarina, 88040-900 Florianópolis, Brazil
| | - Cristiane dos Santos
- Department of Physiological Sciences, Centre of Biological Sciences, Federal University of Santa Catarina, 88040-900 Florianópolis, Brazil
| | - Luiz C. Fernandes
- Department of Physiological Sciences, Centre of Biological Sciences, Federal University of Paraná, Curitiba, Brazil
| | - Antonio C. Boschero
- Department of Functional and Structural Biology, Institute of Biology, State University of Campinas, Campinas, Brazil
| | - Philip C. Calder
- Human Development and Health Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Alex Rafacho
- Department of Physiological Sciences, Centre of Biological Sciences, Federal University of Santa Catarina, 88040-900 Florianópolis, Brazil
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Beaudry JL, D'souza AM, Teich T, Tsushima R, Riddell MC. Exogenous glucocorticoids and a high-fat diet cause severe hyperglycemia and hyperinsulinemia and limit islet glucose responsiveness in young male Sprague-Dawley rats. Endocrinology 2013; 154:3197-208. [PMID: 23766132 DOI: 10.1210/en.2012-2114] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Corticosterone (CORT) and other glucocorticoids cause peripheral insulin resistance and compensatory increases in β-cell mass. A prolonged high-fat diet (HFD) induces insulin resistance and impairs β-cell insulin secretion. This study examined islet adaptive capacity in rats treated with CORT and a HFD. Male Sprague-Dawley rats (age ∼6 weeks) were given exogenous CORT (400 mg/rat) or wax (placebo) implants and placed on a HFD (60% calories from fat) or standard diet (SD) for 2 weeks (N = 10 per group). CORT-HFD rats developed fasting hyperglycemia (>11 mM) and hyperinsulinemia (∼5-fold higher than controls) and were 15-fold more insulin resistant than placebo-SD rats by the end of ∼2 weeks (Homeostatic Model Assessment for Insulin Resistance [HOMA-IR] levels, 15.08 ± 1.64 vs 1.0 ± 0.12, P < .05). Pancreatic β-cell function, as measured by HOMA-β, was lower in the CORT-HFD group as compared to the CORT-SD group (1.64 ± 0.22 vs 3.72 ± 0.64, P < .001) as well as acute insulin response (0.25 ± 0.22 vs 1.68 ± 0.41, P < .05). Moreover, β- and α-cell mass were 2.6- and 1.6-fold higher, respectively, in CORT-HFD animals compared to controls (both P < .05). CORT treatment increased p-protein kinase C-α content in SD but not HFD-fed rats, suggesting that a HFD may lower insulin secretory capacity via impaired glucose sensing. Isolated islets from CORT-HFD animals secreted more insulin in both low and high glucose conditions; however, total insulin content was relatively depleted after glucose challenge. Thus, CORT and HFD, synergistically not independently, act to promote severe insulin resistance, which overwhelms islet adaptive capacity, thereby resulting in overt hyperglycemia.
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Affiliation(s)
- Jacqueline L Beaudry
- School of Kinesiology and Health Science, Faculty of Health, Muscle Health Research Center and Physical Activity and Chronic Disease Unit, York University, 4700 Keele Street, Toronto, ON, Canada M3J 1P3
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Rafacho A, Gonçalves-Neto LM, Ferreira FBD, Protzek AOP, Boschero AC, Nunes EA, Zoccal DB. Glucose homoeostasis in rats exposed to acute intermittent hypoxia. Acta Physiol (Oxf) 2013; 209:77-89. [PMID: 23692825 DOI: 10.1111/apha.12118] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2012] [Revised: 01/15/2013] [Accepted: 05/15/2013] [Indexed: 11/29/2022]
Abstract
AIM Chronic exposure to intermittent hypoxia commonly induces the activation of sympathetic tonus and the disruption of glucose homoeostasis. However, the effects of exposure to acute intermittent hypoxia (AIH) on glucose homoeostasis are not yet fully elucidated. Herein, we evaluated parameters related to glucose metabolism in rats exposed to AIH. METHODS Male adult rats were submitted to 10 episodes of hypoxia (6% O2 , for 45 s) interspersed with 5-min intervals of normoxia (21%), while the control (CTL) group was kept in normoxia. RESULTS Acute intermittent hypoxia rats presented higher fasting glycaemia, normal insulinaemia, increased lactataemia and similar serum lipid levels, compared to controls (n = 10, P < 0.05). Additionally, AIH rats exhibited increased glucose tolerance (GT) (n = 10, P < 0.05) and augmented insulin sensitivity (IS) (n = 10, P < 0.05). The p-Akt/Akt protein ratio was increased in the muscle, but not in the liver and adipose tissue of AIH rats (n = 6, P < 0.05). The elevated glycaemia in AIH rats was associated with a reduction in the hepatic glycogen content (n = 10, P < 0.05). Moreover, the AIH-induced increase in blood glucose concentration, as well as reduced hepatic glycogen content, was prevented by prior systemic administration of the β-adrenergic antagonist (P < 0.05). The effects of AIH on glycaemia and Akt phosphorylation were transient and not observed after 60 min. CONCLUSIONS We suggest that AIH induces an increase in blood glucose concentration as a result of hepatic glycogenolysis recruitment through sympathetic activation. The augmentation of GT and IS might be attributed, at least in part, to increased β-adrenergic sympathetic stimulation and Akt protein activation in skeletal muscles, leading to a higher glucose availability and utilization.
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Affiliation(s)
- A. Rafacho
- Department of Physiological Sciences; Centre of Biological Sciences; UFSC - Federal University of de Santa Catarina; Florianópolis; Santa Catarina; Brazil
| | - L. M. Gonçalves-Neto
- Department of Physiological Sciences; Centre of Biological Sciences; UFSC - Federal University of de Santa Catarina; Florianópolis; Santa Catarina; Brazil
| | - F. B. D. Ferreira
- Department of Physiological Sciences; Centre of Biological Sciences; UFSC - Federal University of de Santa Catarina; Florianópolis; Santa Catarina; Brazil
| | - A. O. P. Protzek
- Department of Structural and Functional Biology; Institute of Biology; UNICAMP - State University of Campinas; Campinas; São Paulo; Brazil
| | - A. C. Boschero
- Department of Structural and Functional Biology; Institute of Biology; UNICAMP - State University of Campinas; Campinas; São Paulo; Brazil
| | - E. A. Nunes
- Department of Physiological Sciences; Centre of Biological Sciences; UFSC - Federal University of de Santa Catarina; Florianópolis; Santa Catarina; Brazil
| | - D. B. Zoccal
- Department of Physiological Sciences; Centre of Biological Sciences; UFSC - Federal University of de Santa Catarina; Florianópolis; Santa Catarina; Brazil
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Costa MM, Violato NM, Taboga SR, Góes RM, Bosqueiro JR. Reduction of insulin signalling pathway IRS-1/IRS-2/AKT/mTOR and decrease of epithelial cell proliferation in the prostate of glucocorticoid-treated rats. Int J Exp Pathol 2012; 93:188-95. [PMID: 22583132 DOI: 10.1111/j.1365-2613.2012.00817.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Previous studies by our research group using a model of insulin resistance induced by dexamethasone (DEX) showed that in the rat ventral prostate there was epithelial and smooth muscle cell atrophy and there were also alterations in fibroblasts. Proteins of the insulin signalling pathway are known to be very important for cell proliferation and development. Thus, we investigated the insulin signalling pathway and epithelial proliferation in the rat ventral prostate in this model and correlated the findings with expression of glucocorticoid (GR) and androgen (AR) receptors. Insulin resistance was induced in adult male Wistar rats by injection of DEX (1 mg/kg, ip for 5 consecutive days), whereas control (CTL) rats received saline. DEX treatment resulted in a significant decrease in body weight, but not in prostate weight. Reductions in insulin receptor 1 (IRS-1) (CTL 1.11 ± 0.06; DEX 0.85 ± 0.03), IRS-2 (CTL 0.95 ± 0.05; DEX 0.49 ± 0.04), AKT (CTL 0.98 ± 0.03; DEX 0.78 ± 0.02), mammalian target of rapamycin (mTOR; CTL 0.65 ± 0.08; DEX 0.22 ± 0.05), GR (CTL 1.30 ± 0.09; DEX 0.57 ± 0.10) and AR (CTL 1.83 ± 0.16; DEX 0.55 ± 0.08) protein levels were observed in the prostate of DEX-treated rats. The expression of the IRα-subunit, phosphoinositide 3-kinase, p-AKT, p70(S6K) , extracellular signal-regulated kinase (ERK) and p-ERK was not altered. The frequency of AR-positive cells in the epithelium of the prostate decreased in the glucocorticoid-treated group, and the intensity of the reaction for this receptor in the cell nuclei was lower in this group. Furthermore, the treatment with DEX reduced the frequency of proliferating cell nuclear antigen-positive (PCNA) cells 30-fold. This study suggests that the reduction in the insulin signalling pathway proteins IRS-1/IRS-2/AKT/mTOR in the prostate of DEX-treated rats may be associated with the morphological alterations observed previously.
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Affiliation(s)
- Maitê M Costa
- Department of Physical Education, Faculty of Sciences, São Paulo State University-Unesp, Bauru, São Paulo, Brazil
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Fang J, DuBois DC, He Y, Almon RR, Jusko WJ. Dynamic modeling of methylprednisolone effects on body weight and glucose regulation in rats. J Pharmacokinet Pharmacodyn 2011; 38:293-316. [PMID: 21394487 DOI: 10.1007/s10928-011-9194-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Accepted: 02/14/2011] [Indexed: 12/21/2022]
Abstract
Influences of methylprednisolone (MPL) and food consumption on body weight (BW), and the effects of MPL on glycemic control including food consumption and the dynamic interactions among glucose, insulin, and free fatty acids (FFA) were evaluated in normal male Wistar rats. Six groups of animals received either saline or MPL via subcutaneous infusions at the rate of 0.03, 0.1, 0.2, 0.3 and 0.4 mg/kg/h for different treatment periods. BW and food consumption were measured twice a week. Plasma concentrations of MPL and corticosterone (CST) were determined at animal sacrifice. Plasma glucose, insulin, and FFA were measured at various times after infusion. Plasma MPL concentrations were simulated by a two-compartment model and used as the driving force in the pharmacodynamic (PD) analysis. All data were modeled using ADAPT 5. The MPL treatments caused reduction of food consumption and body weights in all dosing groups. The steroid also caused changes in plasma glucose, insulin, and FFA concentrations. Hyperinsulinemia was achieved rapidly at the first sampling time of 6 h; significant elevations of FFA were observed in all drug treatment groups; whereas only modest increases in plasma glucose were observed in the low dosing groups (0.03 and 0.1 mg/kg/h). Body weight changes were modeled by dual actions of MPL: inhibition of food consumption and stimulation of weight loss, with food consumption accounting for the input of energy for body weight. Dynamic models of glucose and insulin feedback interactions were extended to capture the major metabolic effects of FFA: stimulation of insulin secretion and inhibition of insulin-stimulated glucose utilization. These models of body weight and glucose regulation adequately captured the experimental data and reflect significant physiological interactions among glucose, insulin, and FFA. These mechanism-based PD models provide further insights into the multi-factor control of this essential metabolic system.
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Affiliation(s)
- Jing Fang
- Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, State University of New York at Buffalo, Buffalo, NY 14260, USA
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Rafacho A, Quallio S, Ribeiro DL, Taboga SR, Paula FMM, Boschero AC, Bosqueiro JR. The adaptive compensations in endocrine pancreas from glucocorticoid-treated rats are reversible after the interruption of treatment. Acta Physiol (Oxf) 2010; 200:223-35. [PMID: 20456283 DOI: 10.1111/j.1748-1716.2010.02146.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIM Glucocorticoid administration induces insulin resistance (IR) and enhances islet mass and insulin secretion in rodents and humans. Here, we analysed whether these effects are still present after the interruption of dexamethasone treatment. METHODS Adult Wistar rats were distributed into CTL (daily injection of saline for five consecutive days), DEX (daily injection of 1 mg kg(-1) body wt of dexamethasone for five consecutive days) and DEX(10) (5 days of dexamethasone treatment, followed by a period of 10 days without dexamethasone). RESULTS In vivo experiments indicated that the marked hyperinsulinemia found in DEX rats during fasting and fed states was normalized in the DEX(10) group. Furthermore, the IR and glucose intolerance observed in DEX were restored in DEX(10) rats. Islets from DEX rats secreted more insulin in response to increasing concentrations of glucose and other metabolic and non-metabolic stimuli, compared with that in the CTL group. The insulin secretion for the most compounds studied returned to CTL values in DEX(10) islets. Increased insulin secretion correlated well with the augmentation in β-cell proliferation and mass in DEX rats, and these morphological alterations were normalized in islets from DEX(10) rats. In parallel, the increased levels of proteins involved in β-cell proliferation such as Cd2 and Cdk4 observed in DEX islets were also normalized in DEX(10) islets. CONCLUSION These data strongly support the view that almost all the morphophysiological alterations induced by dexamethasone in the endocrine pancreas are reverted after discontinuation of the treatment. This information is important, considering the frequent use of glucocorticoids in humans.
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Affiliation(s)
- A Rafacho
- Department of Physical Education, School of Sciences, UNESP - Univ. Estadual Paulista, Bauru, São Paulo, Brazil.
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Abstract
OBJECTIVES We investigated the influence of leucine supplementation on insulin secretion and on some proteins related to insulin secretion in malnourished mice. METHODS Swiss mice (aged 21 days) received isocaloric normo-17% (NP) or 6% low-protein (LP) diet for 120 days. Half of the NP and LP mice received 1.5% leucine in the drinking water during the last 30 days (NPL and LPL, respectively). RESULTS The LP mice were hypoinsulinemic compared with the NP group, whereas LPL mice exhibited increased insulinemia in the fed state versus LP mice. The LP mouse islets were less responsive to 22.2 mM glucose, 100 microM carbachol (Cch), and 10 mM leucine than the NP group. However, LPL islets were more responsive to all these conditions compared with the LP group. The muscarinic type 3 receptor, (M3R) Cabeta2, and PKC-alpha protein contents were reduced in LP compared with NP islets but significantly higher in LPL than LP islets. The p-AKT/AKT ratio was higher in LPL compared with LP islets. CONCLUSIONS Leucine supplementation increases insulin secretion in response to glucose and leucine and to agents that potentiate secretion, such as Cch, in malnourished mice. The enhanced levels of M3R, Cabeta2, and PKC-alpha proteins, as well as of the p-AKT/AKT ratio, may play a role in this process.
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Protzek AOP, Rafacho A, Viscelli BA, Bosqueiro JR, Cappelli AP, Paula FMM, Boschero AC, Pinheiro EC. Insulin and glucose sensitivity, insulin secretion and beta-cell distribution in endocrine pancreas of the fruit bat Artibeus lituratus. Comp Biochem Physiol A Mol Integr Physiol 2010; 157:142-8. [PMID: 20566319 DOI: 10.1016/j.cbpa.2010.05.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 05/28/2010] [Accepted: 05/31/2010] [Indexed: 10/19/2022]
Abstract
The fruit bat Artibeus lituratus absorbs large amounts of glucose in short periods of time and maintains normoglycemia even after a prolonged starvation period. Based on these data, we aimed to investigate various aspects related with glucose homeostasis analyzing: blood glucose and insulin levels, intraperitoneal glucose and insulin tolerance tests (ipGTT and ipITT), glucose-stimulated insulin secretion (2.8, 5.6 or 8.3 mmol/L glucose) in pancreas fragments, cellular distribution of beta cells, and the amount of pAkt/Akt in the pectoral muscle and liver. Blood glucose levels were higher in fed bats (6.88+/-0.5 mmol/L) than fasted bats (4.0+/-0.8 mmol/L), whereas insulin levels were similar in both conditions. The values of the area-under-the curve obtained from ipGTT were significantly higher when bats received 2 (5.5-fold) or 3g/kg glucose (7.5-fold) b.w compared to control (saline). These bats also exhibited a significant decrease of blood glucose values after insulin administration during the ipITT. Insulin secretion from fragments of pancreas under physiological concentrations of glucose (5.6 or 8.3 mmol/L) was similar but higher than in 2.8 mmol/L glucose 1.8- and 2.0-fold, respectively. These bats showed a marked beta-cell distribution along the pancreas, and the pancreatic beta cells are not exclusively located at the central part of the islet. The insulin-induced Akt phosphorylation was more pronounced in the pectoral muscle, compared to liver. The high sensitivity to glucose and insulin, the proper insulin response to glucose, and the presence of an apparent large beta-cell population could represent benefits for the management of high influx of glucose from a carbohydrate-rich meal, which permits appropriate glucose utilization.
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Affiliation(s)
- A O P Protzek
- Department of Physiological Sciences, Institute of Biological Science, University of Brasília, DF, Brazil.
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da Silva PMR, Zoppi CC, Filiputti E, Silveira LR, Quesada I, Boschero AC, Carneiro EM. Preliminary report: leucine supplementation enhances glutamate dehydrogenase expression and restores glucose-induced insulin secretion in protein-malnourished rats. Metabolism 2010; 59:911-3. [PMID: 20015523 DOI: 10.1016/j.metabol.2009.10.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2009] [Revised: 09/16/2009] [Accepted: 10/15/2009] [Indexed: 10/20/2022]
Abstract
Low-protein diet impairs insulin secretion in response to nutrients and may induce several metabolic disorders including diabetes, obesity, and cardiovascular disease. In the present study, the influence of leucine supplementation on glutamate dehydrogenase (GDH) expression and glucose-induced insulin secretion (GIIS) was investigated in malnourished rats. Four groups were fed with different diets for 12 weeks: a normal-protein diet (17%) without or with leucine supplementation or a low (6%)-protein diet without (LP) or with leucine supplementation (LPL). Leucine (1.5%) was supplied in the drinking water. Western blotting analysis revealed reduced GDH expression in LP, whereas LPL displayed improved GDH expression, similar to control. The GIIS and leucine-induced insulin release were also enhanced in LPL compared with LP and similar to those observed in rats fed a normal-protein diet without leucine supplementation. In addition, GDH allosteric activators produced an increased insulin secretion in LPL. These findings indicate that leucine supplementation was able to increase GDH expression leading to GIIS restoration, probably by improved leucine metabolic pathways.
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Affiliation(s)
- Priscilla Muniz Ribeiro da Silva
- Department of Anatomy, Cellular Biology and Physiology and Biophysics, Institute of Biology, State University of Campinas (UNICAMP), Caixa Postal 6109, Campinas, SP CEP, 13083-970, Brazil
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Filiputti E, Rafacho A, Araújo EP, Silveira LR, Trevisan A, Batista TM, Curi R, Velloso LA, Quesada I, Boschero AC, Carneiro EM. Augmentation of insulin secretion by leucine supplementation in malnourished rats: possible involvement of the phosphatidylinositol 3-phosphate kinase/mammalian target protein of rapamycin pathway. Metabolism 2010; 59:635-44. [PMID: 19913855 DOI: 10.1016/j.metabol.2009.09.007] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2009] [Revised: 09/03/2009] [Accepted: 09/04/2009] [Indexed: 01/01/2023]
Abstract
A regimen of low-protein diet induces a reduction of pancreatic islet function that is associated with development of metabolic disorders including diabetes and obesity afterward. In the present study, the influence of leucine supplementation on metabolic parameters, insulin secretion to glucose and to amino acids, as well as the levels of proteins that participate in the phosphatidylinositol 3-phosphate kinase (PI3K) pathway was investigated in malnourished rats. Four groups were fed with different diets for 12 weeks: a normal protein diet (17%) without (NP) or with leucine supplementation (NPL) or a low (6%)-protein diet without (LP) or with leucine supplementation (LPL). Leucine was given in the drinking water during the last 4 weeks. As indicated by the intraperitoneal glucose tolerance test, LPL rats exhibited increased glucose tolerance as compared with NPL group. Both NPL and LPL rats had higher circulating insulin levels than controls. The LPL rats also showed increased insulin secretion by pancreatic islets in response to glucose or arginine compared with those observed in islets from LP animals. Glucose oxidation was significantly reduced in NPL, LP, and LPL isolated islets as compared with NP; but no alteration was observed for leucine and glutamate oxidation among the 4 groups. Western blotting analysis demonstrated increased PI3K and mammalian target protein of rapamycin protein contents in LPL compared with LP islets. A significant increase in insulin-induced insulin receptor substrate 1-associated PI3K activation was also observed in LPL compared with LP islets. These findings indicate that leucine supplementation can augment islet function in malnourished rats and that activation of the PI3K/mammalian target protein of rapamycin pathway may play a role in this process.
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Affiliation(s)
- Eliane Filiputti
- Department of Anatomy, Cell Biology and Physiology and Biophysics, Institute of Biology, State University of Campinas (UNICAMP), Campinas, SP, Brazil
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Angelini N, Rafacho A, Boschero AC, Bosqueiro JR. Involvement of the cholinergic pathway in glucocorticoid-induced hyperinsulinemia in rats. Diabetes Res Clin Pract 2010; 87:184-91. [PMID: 19962776 DOI: 10.1016/j.diabres.2009.11.008] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2009] [Revised: 11/06/2009] [Accepted: 11/09/2009] [Indexed: 11/24/2022]
Abstract
AIMS We investigated the contribution of the cholinergic nervous system to dexamethasone-induced insulin resistance and hyperinsulinemia in rats. METHODS Seventy-day-old Wistar male rats were distributed in groups: control (CTL), vagotomized (VAG), and sham operated (SHAM). On the 90th day of life, half of the rats were treated daily with 1mg/kg of dexamethasone for 5 days (CTL DEX, VAG DEX, and SHAM DEX). RESULTS In the presence of 8.3mM glucose plus 100microM carbachol (Cch), isolated islets from CTL DEX secreted significantly more insulin than CTL. Cch-enhancement of secretion was further increased in islets from VAG CTL and VAG DEX than SHAM CTL and SHAM DEX, respectively. In CTL DEX islets, M3R and PLCbeta1 and phosphorylated PKCalpha, but not PKCalpha, protein content was significantly higher compared with each respective control. In islets from VAG DEX, the expression of M3R protein increased significantly compared to VAG CTL and SHAM DEX. Vagotomy per se did not affect insulin resistance, but attenuated fasted and fed insulinemia in VAG DEX, compared with SHAM DEX rats. CONCLUSION These data indicate an important participation of the cholinergic nervous system through muscaric receptors in dexamethasone-induced hyperinsulinemia in rats.
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Affiliation(s)
- Nágela Angelini
- Department of Anatomy, Cellular Biology and Physiology, Institute of Biology, State University of Campinas, São Paulo, Brazil
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