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Hoefel AL, Arbo BD, Vieira-Marques C, Cecconello AL, Cozer AG, Ribeiro MFM, Kucharski LC. Female rats are more susceptible to metabolic effects of dehydroepiandrosterone treatment. Can J Physiol Pharmacol 2018; 96:1069-1075. [PMID: 30011383 DOI: 10.1139/cjpp-2018-0159] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dehydroepiandrosterone (DHEA) is a steroid hormone that presents several effects on metabolism; however, most of the studies have been performed on male animals, while few authors have investigated possible sex differences regarding the metabolic effects of DHEA. Therefore, the aim of this study was to evaluate the effect of different doses of DHEA on metabolic parameters of male and ovariectomized female Wistar rats. Sex differences were found in the metabolism of distinct substrates and in relation to the effect of DHEA. In respect to the glucose metabolism in the liver, the conversion of glucose to CO2 and the synthesis of lipids from glucose were 53% and 33% higher, respectively, in males. Also, DHEA decreased hepatic lipogenesis only in females. Regarding the hepatic glycogen synthesis pathway, females presented 73% higher synthesis than males, and the effect of DHEA was observed only in females, where it decreased this parameter. In the adipose tissue, glucose uptake was 208% higher in females and DHEA decreased this parameter. In the muscle, glucose uptake was 168% higher in females and no DHEA effect was observed. In summary, males and females present a different metabolic profile, with females being more susceptible to the metabolic effects of DHEA.
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Affiliation(s)
- Ana Lúcia Hoefel
- a Laboratório de Metabolismo e Endocrinologia Comparada, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil.,b Laboratório de Interação Neuro-humoral, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Bruno Dutra Arbo
- c Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Rio Grande, Rio Grande do Sul, Brazil
| | - Claudia Vieira-Marques
- a Laboratório de Metabolismo e Endocrinologia Comparada, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil.,b Laboratório de Interação Neuro-humoral, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Ana Lúcia Cecconello
- b Laboratório de Interação Neuro-humoral, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Aline Gonçalves Cozer
- a Laboratório de Metabolismo e Endocrinologia Comparada, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Maria Flávia Marques Ribeiro
- b Laboratório de Interação Neuro-humoral, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
| | - Luiz Carlos Kucharski
- a Laboratório de Metabolismo e Endocrinologia Comparada, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
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Cozer AG, Trapp M, Martins TL, De Fraga LS, Vieira Marques C, Model JFA, Schein V, Kucharski LC, Da Silva RS. Effects of Stanniocalcin-1 on glucose flux in rat brown adipose tissue. Biochimie 2017; 138:50-55. [DOI: 10.1016/j.biochi.2017.04.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2016] [Accepted: 04/18/2017] [Indexed: 11/26/2022]
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Rigon F, Horst A, Kucharski LC, Silva RSM, Faccioni-Heuser MC, Partata WA. Effects of sciatic nerve transection on glucose uptake in the presence and absence of lactate in the frog dorsal root ganglia and spinal cord. BRAZ J BIOL 2014; 74:S191-8. [DOI: 10.1590/1519-6984.26012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 06/13/2013] [Indexed: 01/09/2023] Open
Abstract
Frogs have been used as an alternative model to study pain mechanisms because the simplicity of their nervous tissue and the phylogenetic aspect of this question. One of these models is the sciatic nerve transection (SNT), which mimics the clinical symptoms of “phantom limb”, a condition that arises in humans after amputation or transverse spinal lesions. In mammals, the SNT increases glucose metabolism in the central nervous system, and the lactate generated appears to serve as an energy source for nerve cells. An answerable question is whether there is elevated glucose uptake in the dorsal root ganglia (DRG) after peripheral axotomy. As glucose is the major energy substrate for frog nervous tissue, and these animals accumulate lactic acid under some conditions, bullfrogs Lithobates catesbeianus were used to demonstrate the effect of SNT on DRG and spinal cord 1-[14C] 2-deoxy-D-glucose (14C-2-DG) uptake in the presence and absence of lactate. We also investigated the effect of this condition on the formation of 14CO2 from 14C-glucose and 14C-L-lactate, and plasmatic glucose and lactate levels. The 3-O-[14C] methyl-D-glucose (14C-3-OMG) uptake was used to demonstrate the steady-state tissue/medium glucose distribution ratio under these conditions. Three days after SNT, 14C-2-DG uptake increased, but 14C-3-OMG uptake remained steady. The increase in 14C-2-DG uptake was lower when lactate was added to the incubation medium. No change was found in glucose and lactate oxidation after SNT, but lactate and glucose levels in the blood were reduced. Thus, our results showed that SNT increased the glucose metabolism in the frog DRG and spinal cord. The effect of lactate on this uptake suggests that glucose is used in glycolytic pathways after SNT.
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Affiliation(s)
| | - A Horst
- Universidade Federal do Rio Grande do Sul – UFRGS, Brazil
| | - LC Kucharski
- Universidade Federal do Rio Grande do Sul – UFRGS, Brazil
| | - RSM Silva
- Universidade Federal do Rio Grande do Sul – UFRGS, Brazil
| | | | - WA Partata
- Universidade Federal do Rio Grande do Sul – UFRGS, Brazil
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de Souza DK, Ribeiro MFM, Kucharski LCR. Effects of dehydroepiandrosterone (DHEA) and lactate on glucose uptake in the central nervous system. Neurosci Lett 2012; 507:62-6. [DOI: 10.1016/j.neulet.2011.11.052] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2011] [Revised: 11/06/2011] [Accepted: 11/26/2011] [Indexed: 10/14/2022]
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Jahn MP, Gomes LF, Jacob MHVM, da Rocha Janner D, Araújo ASDR, Belló-Klein A, Ribeiro MFM, Kucharski LC. The effect of dehydroepiandrosterone (DHEA) on renal function and metabolism in diabetic rats. Steroids 2011; 76:564-70. [PMID: 21349280 DOI: 10.1016/j.steroids.2011.02.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2010] [Revised: 02/15/2011] [Accepted: 02/15/2011] [Indexed: 01/12/2023]
Abstract
Dehydroepiandrosterone (DHEA) is an endogenous steroid hormone involved in a number of biological actions in humans and rodents, but its effects on renal tissue have not yet been fully understood. The aim of this study is to assess the effect of DHEA treatment on diabetic rats, mainly in relation to renal function and metabolism. Diabetic rats were treated with subcutaneous injections of a 10mg/kg dose of DHEA diluted in oil. Plasma glucose and creatinine, in addition to urine creatinine, were quantified espectophotometrically. Glucose uptake and oxidation were quantified using radioactive glucose, the urinary Transforming Growth Factor β(1) (TGF-β(1)) was assessed by enzyme immunoassay, and the total glutathione in the renal tissue was also measured. The diabetic rats displayed higher levels of glycemia, and DHEA treatment reduced hyperglycemia. Plasmatic creatinine levels were higher in the diabetic rats treated with DHEA, while creatinine clearance was lower. Glucose uptake and oxidation were lower in the renal medulla of the diabetic rats treated with DHEA, and urinary TGF-β(1), as well as total gluthatione levels, were higher in the diabetic rats treated with DHEA. DHEA treatment was not beneficial to renal tissue, since it reduced the glomerular filtration rate and renal medulla metabolism, while increasing the urinary excretion of TGF-β(1) and the compensatory response by the glutathione system, probably due to a mechanism involving a pro-oxidant action or a pro-fibrotic effect of this androgen or its derivatives. In conclusion, this study reports that DHEA treatment may be harmful to renal tissue, but the mechanisms of this action have not yet been fully understood.
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Affiliation(s)
- Matheus Parmegiani Jahn
- Laboratório de Metabolismo e Endocrinologia Comparada, Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul (UFRGS), Av. Sarmento Leite, 500, Porto Alegre, Rio Grande do Sul CEP 90050-170, Brazil.
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de Fraga LS, da Silva RSM, Zancan DM. Control of carbohydrate metabolism in an anoxia-tolerant nervous system. JOURNAL OF EXPERIMENTAL ZOOLOGY. PART A, ECOLOGICAL GENETICS AND PHYSIOLOGY 2010; 313:539-547. [PMID: 20960558 DOI: 10.1002/jez.624] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Anoxia-tolerant animal models are crucial to understand protective mechanisms during low oxygen excursions. As glycogen is the main fermentable fuel supporting energy production during oxygen tension reduction, understanding glycogen metabolism can provide important insights about processes involved in anoxia survival. In this report we studied carbohydrate metabolism regulation in the central nervous system (CNS) of an anoxia-tolerant land snail during experimental anoxia exposure and subsequent reoxygenation. Glucose uptake, glycogen synthesis from glucose, and the key enzymes of glycogen metabolism, glycogen synthase (GS) and glycogen phosphorylase (GP), were analyzed. When exposed to anoxia, the nervous ganglia of the snail achieved a sustained glucose uptake and glycogen synthesis levels, which seems important to maintain neural homeostasis. However, the activities of GS and GP were reduced, indicating a possible metabolic depression in the CNS. During the aerobic recovery period, the enzyme activities returned to basal values. The possible strategies used by Megalobulimus abbreviatus CNS to survive anoxia are discussed.
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Affiliation(s)
- Luciano Stürmer de Fraga
- Departamento de Fisiologia, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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The effect of long-term DHEA treatment on glucose metabolism, hydrogen peroxide and thioredoxin levels in the skeletal muscle of diabetic rats. J Steroid Biochem Mol Biol 2010; 120:38-44. [DOI: 10.1016/j.jsbmb.2010.03.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Revised: 02/23/2010] [Accepted: 03/01/2010] [Indexed: 11/20/2022]
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Valle SC, Eichler P, Maciel JE, Machado G, Kucharski LC, Da Silva RSM. Seasonal variation in glucose and neutral amino acid uptake in the estuarine crab Neohelice granulata. Comp Biochem Physiol A Mol Integr Physiol 2009; 153:252-7. [DOI: 10.1016/j.cbpa.2009.02.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2008] [Revised: 02/13/2009] [Accepted: 02/14/2009] [Indexed: 10/21/2022]
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Salceda R, Hernández-Espinosa C, Sánchez-Chávez G. l-Arginine Uptake in Normal and Diabetic Rat Retina and Retinal Pigment Epithelium. Neurochem Res 2008; 33:1541-5. [DOI: 10.1007/s11064-008-9641-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2007] [Accepted: 02/21/2008] [Indexed: 02/02/2023]
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Kucharski LC, Schein V, Capp E, da Silva RSM. In vitro insulin stimulatory effect on glucose uptake and glycogen synthesis in the gills of the estuarine crab Chasmagnathus granulata. Gen Comp Endocrinol 2002; 125:256-63. [PMID: 11884071 DOI: 10.1006/gcen.2001.7748] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of the present study was to examine the effects of insulin on glucose uptake and glycogen synthesis in crab Chasmagnathus granulata gills. We observed an increased glucose uptake and incorporation of d-[(14)C]glucose into glycogen when posterior C. granulata gills were incubated in the presence of insulin; however, this was not observed in anterior gills, despite the presence of similar insulin receptors. In posterior gills, basal glucose uptake in the summer was significantly higher than in the winter. Moreover, in the summer, the insulin dose required to stimulate glucose uptake was twice as high as in the winter. However, there was no significant difference in terms of basal glycogen synthesis in summer and winter. In crustaceans, the endogenous insulin/IGFI substance might be involved in the rapid restoration of glycogen levels in the gills, increasing glucose uptake and glycogen synthesis. Bovine insulin seems to have a stimulatory effect on glycogen metabolism only in posterior gills.
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Affiliation(s)
- Luiz Carlos Kucharski
- Department of Physiology, Instituto de Ciências Básicas da Saúde, Porto Alegre, RS, 90050-170, Brazil
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Machado VLA, Marques M. Effects of insulin on the glucose uptake by the thyroid gland of the turtleChrysemys dorbigni acclimated to different temperatures. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/jez.1402660406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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