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Ghiarone T, Andrade-Souza VA, Learsi SK, Tomazini F, Ataide-Silva T, Sansonio A, Fernandes MP, Saraiva KL, Figueiredo RCBQ, Tourneur Y, Kuang J, Lima-Silva AE, Bishop DJ. Twice-a-day training improves mitochondrial efficiency, but not mitochondrial biogenesis, compared with once-daily training. J Appl Physiol (1985) 2019; 127:713-725. [PMID: 31246557 DOI: 10.1152/japplphysiol.00060.2019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Exercise training performed with lowered muscle glycogen stores can amplify adaptations related to oxidative metabolism, but it is not known if this is affected by the "train-low" strategy used (i.e., once-daily versus twice-a-day training). Fifteen healthy men performed 3 wk of an endurance exercise (100-min) followed by a high-intensity interval exercise 2 (twice-a-day group, n = 8) or 14 h (once-daily group, n = 7) later; therefore, the second training session always started with low muscle glycogen in both groups. Mitochondrial efficiency (state 4 respiration) was improved only for the twice-a-day group (group × training interaction, P < 0.05). However, muscle citrate synthase activity, mitochondria, and lipid area in intermyofibrillar and subsarcolemmal regions, and PGC1α, PPARα, and electron transport chain relative protein abundance were not altered with training in either group (P > 0.05). Markers of aerobic fitness (e.g., peak oxygen uptake) were increased, and plasma lactate, O2 cost, and rating of perceived exertion during a 100-min exercise task were reduced in both groups, although the reduction in rating of perceived exertion was larger in the twice-a-day group (group × time × training interaction, P < 0.05). These findings suggest similar training adaptations with both training low approaches; however, improvements in mitochondrial efficiency and perceived effort seem to be more pronounced with twice-a-day training.NEW & NOTEWORTHY We assessed, for the first time, the differences between two "train-low" strategies (once-daily and twice-a-day) in terms of training-induced molecular, functional, and morphological adaptations. We found that both strategies had similar molecular and morphological adaptations; however, only the twice-a-day strategy increased mitochondrial efficiency and had a superior reduction in the rating of perceived exertion during a constant-load exercise compared with once-daily training. Our findings provide novel insights into skeletal muscle adaptations using the "train-low" strategy.
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Affiliation(s)
- Thaysa Ghiarone
- Sport Science Research Group, Department of Physical Education and Sports Science, Academic Center of Vitoria, Federal University of Pernambuco, Vitoria de Santo Antao, Pernambuco, Brazil.,Dalton Cardiovascular Research Center, University of Missouri, Columbia, Missouri
| | - Victor A Andrade-Souza
- Sport Science Research Group, Department of Physical Education and Sports Science, Academic Center of Vitoria, Federal University of Pernambuco, Vitoria de Santo Antao, Pernambuco, Brazil
| | - Sara K Learsi
- Sciences Applied in Sports Research Group, Institute of Biological and Health Sciences, Federal University of Alagoas, Maceio, Alagoas, Brazil
| | - Fabiano Tomazini
- Human Performance Research Group, Academic Department of Physical Education, Technological Federal University of Parana and Federal University of Parana, Curitiba, Parana, Brazil
| | - Thays Ataide-Silva
- Faculty of Nutrition, Federal University of Alagoas, Maceio, Alagoas, Brazil
| | - Andre Sansonio
- Sport Science Research Group, Department of Physical Education and Sports Science, Academic Center of Vitoria, Federal University of Pernambuco, Vitoria de Santo Antao, Pernambuco, Brazil
| | - Mariana P Fernandes
- Sport Science Research Group, Department of Physical Education and Sports Science, Academic Center of Vitoria, Federal University of Pernambuco, Vitoria de Santo Antao, Pernambuco, Brazil
| | - Karina L Saraiva
- Nucleus of Technological Platforms, Aggeu Magalhães Institute, Oswaldo Cruz Foundation (FIOCRUZ), Recife, Brazil
| | - Regina C B Q Figueiredo
- Laboratory of Cell Biology, Department of Microbiology, Aggeu Magalhães Institute, FIOCRUZ, Recife, Brazil
| | - Yves Tourneur
- Sport Science Research Group, Department of Physical Education and Sports Science, Academic Center of Vitoria, Federal University of Pernambuco, Vitoria de Santo Antao, Pernambuco, Brazil.,Faculty of Medicine Lyon South, University of Lyon, Lyon, France
| | - Jujiao Kuang
- Institute for Health and Sport, Victoria University, Melbourne, Victoria, Australia
| | - Adriano E Lima-Silva
- Sport Science Research Group, Department of Physical Education and Sports Science, Academic Center of Vitoria, Federal University of Pernambuco, Vitoria de Santo Antao, Pernambuco, Brazil.,Human Performance Research Group, Academic Department of Physical Education, Technological Federal University of Parana and Federal University of Parana, Curitiba, Parana, Brazil
| | - David J Bishop
- Institute for Health and Sport, Victoria University, Melbourne, Victoria, Australia.,School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia
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El-Sisi AEDES, Sokar SS, Shebl AM, Mohamed DZ. Antifibrotic effect of diethylcarbamazine combined with hesperidin against ethanol induced liver fibrosis in rats. Biomed Pharmacother 2017; 89:1196-1206. [DOI: 10.1016/j.biopha.2017.03.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Revised: 03/03/2017] [Accepted: 03/05/2017] [Indexed: 02/09/2023] Open
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Phosphodiesterase-5 inhibition promotes remyelination by MCP-1/CCR-2 and MMP-9 regulation in a cuprizone-induced demyelination model. Exp Neurol 2016; 275 Pt 1:143-53. [DOI: 10.1016/j.expneurol.2015.10.013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/05/2015] [Accepted: 10/26/2015] [Indexed: 12/27/2022]
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Rodrigues GB, Rocha SWS, Santos LAMD, de Oliveira WH, Gomes FODS, de França MEDR, Lós DB, Peixoto CA. Diethylcarbamazine: Possible therapeutic alternative in the treatment of alcoholic liver disease in C57BL/6 mice. Clin Exp Pharmacol Physiol 2015; 42:369-79. [DOI: 10.1111/1440-1681.12369] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 01/12/2015] [Accepted: 01/28/2015] [Indexed: 12/12/2022]
Affiliation(s)
| | | | | | | | | | | | - Deniele Bezerra Lós
- Postgraduate Program in Biotechnology (RENORBIO); Federal University of Pernambuco; Pernambuco Brazil
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Diethylcarbamazine reduces chronic inflammation and fibrosis in carbon tetrachloride- (CCl₄-) induced liver injury in mice. Mediators Inflamm 2014; 2014:696383. [PMID: 25374445 PMCID: PMC4211150 DOI: 10.1155/2014/696383] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2014] [Revised: 08/15/2014] [Accepted: 08/27/2014] [Indexed: 02/07/2023] Open
Abstract
This study investigated the anti-inflammatory effects of DEC on the CCl4-induced hepatotoxicity in C57BL/6 mice. Chronic inflammation was induced by i.p. administration of CCl4 0.5 μL/g of body weight through two injections a week for 6 weeks. DEC (50 mg/kg) was administered by gavage for 12 days before finishing the CCl4 induction. Histological analyses of the DEC-treated group exhibited reduced inflammatory process and prevented liver necrosis and fibrosis. Immunohistochemical and immunofluorescence analyses of the DEC-treated group showed reduced COX-2, IL1β, MDA, TGF-β, and αSMA immunopositivity, besides exhibiting decreased IL1β, COX-2, NFκB, IFNγ, and TGFβ expressions in the western blot analysis. The DEC group enhanced significantly the IL-10 expression. The reduction of hepatic injury in the DEC-treated group was confirmed by the COX-2 and iNOS mRNA expression levels. Based on the results of the present study, DEC can be used as a potential anti-inflammatory drug for chronic hepatic inflammation.
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Diethylcarbamazine attenuates the development of carrageenan-induced lung injury in mice. Mediators Inflamm 2014; 2014:105120. [PMID: 24550603 PMCID: PMC3914510 DOI: 10.1155/2014/105120] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Accepted: 12/03/2013] [Indexed: 12/21/2022] Open
Abstract
Diethylcarbamazine (DEC) is an antifilarial drug with potent anti-inflammatory properties as a result of its interference with the metabolism of arachidonic acid. The aim of the present study was to evaluate the anti-inflammatory activity of DEC in a mouse model of acute inflammation (carrageenan-induced pleurisy). The injection of carrageenan into the pleural cavity induced the accumulation of fluid containing a large number of polymorphonuclear cells (PMNs) as well as infiltration of PMNs in lung tissues and increased production of nitrite and tumor necrosis factor-α and increased expression of interleukin-1β, cyclooxygenase (COX-2), and inducible nitric oxide synthase. Carrageenan also induced the expression of nuclear factor-κB. The oral administration of DEC (50 mg/Kg) three days prior to the carrageenan challenge led to a significant reduction in all inflammation markers. The present findings demonstrate that DEC is a potential drug for the treatment of acute lung inflammation.
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Wanderley MI, Saraiva KLA, César Vieira JSB, Peixoto CA, Udrisar DP. Foetal exposure to Panax ginseng extract reverts the effects of prenatal dexamethasone in the synthesis of testosterone by Leydig cells of the adult rat. Int J Exp Pathol 2013; 94:230-40. [PMID: 23672767 DOI: 10.1111/iep.12026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 04/11/2013] [Indexed: 02/04/2023] Open
Abstract
The aim of this study was to examine the effect of maternal exposure to Panax ginseng extract (GE) on the prenatal dexamethasone (DEXA)-induced increase in testosterone production by isolated Leydig cells in adult rats. Pregnant rats were treated with (i) GE (200 mg/kg) or vehicle on days 10-21; (ii) DEXA (100 μg/kg) or vehicle on days 14-21; or (iii) a combination of GE plus DEXA at the same doses and with the same regimen. Testosterone production was induced either by the activator of protein kinase A (dbcAMP) or substrates of steroidogenesis [22(R)-hydroxycholesterol (22(R)-OH-C)] and pregnenolone. The capacity of rat Leydig cells exposed to DEXA to synthesize testosterone induced by dbcAMP, 22(R)-OH-C or pregnenolone was increased in comparison with the control group. Combined exposure to DEXA + GE prevented the effect of DEXA on the responsiveness of Leydig cells to all inductors of testosterone synthesis, whereas GE alone did not modify the response to inductors. No modifications in testosterone production were observed under basal conditions. StAR immunoexpression in Leydig cells was not modified by prenatal exposure to DEXA, GE or DEXA + GE. P450scc and glucocorticoid receptor immunoexpression was higher in offspring exposed to DEXA in comparison with the control group. This increased expression was prevented by combined treatment with DEXA + GE. The present findings demonstrate that GE is capable of reversing the effect of DEXA on testosterone synthesis by rat Leydig cells.
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Affiliation(s)
- Maria I Wanderley
- Department of Physiology and Pharmacology, Universidade Federal de Pernambuco, Recife, Brazil.
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Ojo OO, Bhadauria S, Rath SK. Dose-dependent adverse effects of salinomycin on male reproductive organs and fertility in mice. PLoS One 2013; 8:e69086. [PMID: 23840907 PMCID: PMC3698082 DOI: 10.1371/journal.pone.0069086] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Accepted: 06/10/2013] [Indexed: 11/19/2022] Open
Abstract
Salinomycin is used as an antibiotic in animal husbandry. Its implication in cancer therapy has recently been proposed. Present study evaluated the toxic effects of Salinomycin on male reproductive system of mice. Doses of 1, 3 or 5 mg/kg of Salinomycin were administered daily for 28 days. Half of the mice were sacrificed after 24 h of the last treatment and other half were sacrificed 28 days after withdrawal of treatment. Effects of SAL on body and reproductive organ weights were studied. Histoarchitecture of testis and epididymis was evaluated along with ultrastructural changes in Leydig cells. Serum and testicular testosterone and luteinizing hormones were estimated. Superoxide dismutase, reduced glutathione, lipid peroxidation, catalase and lactate dehydrogenase activities were measured. Spermatozoa count, morphology, motility and fertility were evaluated. Expression patterns of steroidogenic acute regulatory protein (StAR) and cytochrome P450 side chain cleavage proteins (CYP11A1) were assessed by Western blotting. Salinomycin treatment was lethal to few mice and retarded body growth in others with decreased weight of testes and seminal vesicles in a dose dependent manner. Seminiferous tubules in testes were disrupted and the epithelium of epididymis showed frequent occurrence of vacuolization and necrosis. Leydig cells showed hypertrophied cytoplasm with shrunken nuclei, condensed mitochondria, proliferated endoplasmic reticulum and increased number of lipid droplets. Salinomycin decreased motility and spermatozoa count with increased number of abnormal spermatozoa leading to infertility. The testosterone and luteinizing hormone levels were decreased in testis but increased in serum at higher doses. Depletion of superoxide dismutase and reduced glutathione with increased lipid peroxidation in both testis and epididymis indicated generation of oxidative stress. Suppressed expression of StAR and CYP11A1 proteins indicates inhibition of steroidogenesis. Spermatogenesis was however observed in testis 28 days after Salinomycin withdrawal. The results indicate reversible dose-dependent adverse effects of Salinomycin on male reproductive system of mice.
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Affiliation(s)
| | - Smrati Bhadauria
- Toxicology Division, CSIR-Central Drug Research Institute, Lucknow, India
| | - Srikanta Kumar Rath
- Toxicology Division, CSIR-Central Drug Research Institute, Lucknow, India
- * E-mail:
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de Albuquerque Couto J, Saraiva KLA, Barros CD, Udrisar DP, Peixoto CA, Vieira JSBC, do Carmo Alves de Lima M, Galdino SL, da Rocha Pitta I, Wanderley MI. Effect of chronic treatment with new benzylidene-thiazolidine-2,4-dione (LPSF/GQ-06) with potential hypoglycemic on rat Leydig cell steroidogenesis. Med Chem Res 2013. [DOI: 10.1007/s00044-012-0024-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Zymomonas mobilis culture protects against sepsis by modulating the inflammatory response, alleviating bacterial burden and suppressing splenocyte apoptosis. Eur J Pharm Sci 2013; 48:1-8. [DOI: 10.1016/j.ejps.2012.10.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 10/01/2012] [Accepted: 10/02/2012] [Indexed: 12/21/2022]
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11
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Nunes AKDS, Rapôso C, Luna RLDA, Cruz-Höfling MAD, Peixoto CA. Sildenafil (Viagra®) down regulates cytokines and prevents demyelination in a cuprizone-induced MS mouse model. Cytokine 2012; 60:540-51. [DOI: 10.1016/j.cyto.2012.06.011] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 05/22/2012] [Accepted: 06/05/2012] [Indexed: 12/21/2022]
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12
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Effect of diethylcarbamazine on chronic hepatic inflammation induced by alcohol in C57BL/6 mice. Eur J Pharmacol 2012; 689:194-203. [DOI: 10.1016/j.ejphar.2012.05.044] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 05/31/2012] [Accepted: 05/31/2012] [Indexed: 12/12/2022]
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13
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Oliveira EC, Moura MRP, de Sá MJ, Silva VA, Kastelic JP, Douglas RH, Marques AP. Permanent contraception of dogs induced with intratesticular injection of a Zinc Gluconate-based solution. Theriogenology 2012; 77:1056-63. [DOI: 10.1016/j.theriogenology.2011.10.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2011] [Revised: 09/22/2011] [Accepted: 10/08/2011] [Indexed: 10/14/2022]
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14
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Vieira JSBC, Saraiva KLA, Barbosa MCL, Porto RCC, Cresto JC, Peixoto CA, Wanderley MI, Udrisar DP. Effect of dexamethasone and testosterone treatment on the regulation of insulin-degrading enzyme and cellular changes in ventral rat prostate after castration. Int J Exp Pathol 2011; 92:272-80. [PMID: 21507087 DOI: 10.1111/j.1365-2613.2011.00772.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Insulin-degrading enzyme (IDE) has been shown to enhance the binding of androgen and glucocorticoid receptors to DNA in the nuclear compartment. Glucocorticoids cause hyperglycaemia, peripheral resistance to insulin and compensatory hyperinsulinaemia. The aim of the present study was to investigate the effect of dexamethasone (D), testosterone (T) and dexamethasone plus testosterone (D + T) on the regulation of IDE and on the remodelling of rat ventral prostate after castration (C). Castration led to a marked reduction in prostate weight (PW). Body weight was significantly decreased in the castrated animals treated with dexamethasone, and the relative PW was 2.6-fold (±0.2) higher in the D group, 2.8-fold (±0.3) higher in the T group and 6.6-fold (±0.6) higher in the D + T group in comparison with the castrated rats. Ultrastructural alterations in the ventral prostate in response to androgen deprivation were restored after testosterone and dexamethasone plus testosterone treatments and partially restored with dexamethasone alone. The nuclear IDE protein level indicated a 4.3-fold (±0.4) increase in castrated rats treated with D + T when compared with castration alone. Whole-cell IDE protein levels increased approximately 1.5-fold (±0.1), 1.5-fold (±0.1) and 2.9-fold (±0.2) in the D, T and D + T groups, respectively, when compared with castration alone. In conclusion, the present study reports that dexamethasone-induced hyperinsulinaemic condition plus exogenous testosterone treatment leads to synergistic effects of insulin and testosterone in the prostatic growth and in the amount of IDE in the nucleus and whole epithelial cell.
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Affiliation(s)
- Juliany S B César Vieira
- Department of Physiology and Pharmacology, Federal University of Pernambuco (UFPE), Recife, Pernambuco, Brazil
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Couto JA, Saraiva KLA, Barros CD, Udrisar DP, Peixoto CA, Vieira JSBC, Lima MC, Galdino SL, Pitta IR, Wanderley MI. Effect of chronic treatment with Rosiglitazone on Leydig cell steroidogenesis in rats: in vivo and ex vivo studies. Reprod Biol Endocrinol 2010; 8:13. [PMID: 20144211 PMCID: PMC2829566 DOI: 10.1186/1477-7827-8-13] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2009] [Accepted: 02/09/2010] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND The present study was designed to examine the effect of chronic treatment with rosiglitazone - thiazolidinedione used in the treatment of type 2 diabetes mellitus for its insulin sensitizing effects - on the Leydig cell steroidogenic capacity and expression of the steroidogenic acute regulatory protein (StAR) and cholesterol side-chain cleavage enzyme (P450scc) in normal adult rats. METHODS Twelve adult male Wistar rats were treated with rosiglitazone (5 mg/kg) administered by gavage for 15 days. Twelve control animals were treated with the vehicle. The ability of rosiglitazone to directly affect the production of testosterone by Leydig cells ex vivo was evaluated using isolated Leydig cells from rosiglitazone-treated rats. Testosterone production was induced either by activators of the cAMP/PKA pathway (hCG and dbcAMP) or substrates of steroidogenesis [22(R)-hydroxy-cholesterol (22(R)-OH-C), which is a substrate for the P450scc enzyme, and pregnenolone, which is the product of the P450scc-catalyzed step]. Testosterone in plasma and in incubation medium was measured by radioimmunoassay. The StAR and P450scc expression was detected by immunocytochemistry. RESULTS The levels of total circulating testosterone were not altered by rosiglitazone treatment. A decrease in basal or induced testosterone production occurred in the Leydig cells of rosiglitazone-treated rats. The ultrastructural and immunocytochemical analysis of Leydig cells from rosiglitazone-treated rats revealed cells with characteristics of increased activity as well as increased StAR and P450scc expression, which are key proteins in androgen biosynthesis. However, a number of rosiglitazone-treated cells exhibited significant mitochondrial damage. CONCLUSION The results revealed that the Leydig cells from rosiglitazone-treated rats showed significant reduction in testosterone production under basal, hCG/dbcAMP- or 22 (R)-OH-C/pregnenolone-induced conditions, although increased labeling of StAR and P450scc was detected in these cells by immunocytochemistry. The ultrastructural study suggested that the lower levels of testosterone produced by these cells could be due to mitochondrial damage induced by rosiglitazone.
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Affiliation(s)
- Janaína A Couto
- Department of Morphology and Physiology, Universidade Federal Rural de Pernambuco, Recife, 52.171-900, Brazil
| | - Karina LA Saraiva
- Ultrastructure Laboratory, Aggeu Magalhães Research Center (FIOCRUZ) and Center for Strategic Technologies of the Northeast (CETENE), Recife, 50.670-901, Brazil
| | - Cleiton D Barros
- Department of Antibiotics, Universidade Federal de Pernambuco, Recife, 50.670-901, Brazil
| | - Daniel P Udrisar
- Department of Physiology and Pharmacology, Universidade Federal de Pernambuco, Recife, 50.670-901, Brazil
| | - Christina A Peixoto
- Ultrastructure Laboratory, Aggeu Magalhães Research Center (FIOCRUZ) and Center for Strategic Technologies of the Northeast (CETENE), Recife, 50.670-901, Brazil
| | - Juliany SB César Vieira
- Department of Physiology and Pharmacology, Universidade Federal de Pernambuco, Recife, 50.670-901, Brazil
| | - Maria C Lima
- Department of Antibiotics, Universidade Federal de Pernambuco, Recife, 50.670-901, Brazil
| | - Suely L Galdino
- Department of Antibiotics, Universidade Federal de Pernambuco, Recife, 50.670-901, Brazil
| | - Ivan R Pitta
- Department of Antibiotics, Universidade Federal de Pernambuco, Recife, 50.670-901, Brazil
| | - Maria I Wanderley
- Department of Physiology and Pharmacology, Universidade Federal de Pernambuco, Recife, 50.670-901, Brazil
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Saraiva KLA, Silva AKSE, Wanderley MI, De Araújo AA, De Souza JRB, Peixoto CA. Chronic treatment with sildenafil stimulates Leydig cell and testosterone secretion. Int J Exp Pathol 2009; 90:454-62. [PMID: 19659904 DOI: 10.1111/j.1365-2613.2009.00660.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The phosphodiesterase type 5 (PDE5) inhibitor, Sildenafil, is a novel, oral treatment approach for pulmonary hypertension. As Leydig cells present PDE5, this study was conducted to investigate the effects of the chronic treatment with Sildenafil (25 mg/kg) on male Swiss Webster mice steroidogenesis. After a 4-week long experimental design, Leydig cells were analysed by morphological and immunocytochemical procedures. Serum testosterone was assayed by radioimmunoassay. Leydig cells presented noteworthy ultrastructural alterations, such as a vesicular smooth endoplasmic reticulum, large vacuoles scattered through the cytoplasm, enlarged mitochondria with discontinue cristaes and whorle membranes with vesicles at the periphery, which are typical characteristics of an activated steroid-secreting cell. Important immunocytochemical labelling for steroidogenic acute regulatory protein, cytochrome P450 side-chain cleavage enzyme and testosterone were detected in isolated Leydig cells. In addition, Sildenafil-treated mice showed significant increased levels of total testosterone. The results obtained in the present study are consistent with the hypothesis that the accumulation of cyclic guanosine monophosphate by PDE5 inhibition could be involved in the androgen biosynthesis stimulation. Important clinical implications of hormonal disorders should be taken into account for patients with pulmonary hypertension.
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Saraiva KLA, Silva VAD, Torres DDOC, Donato MAM, Peres NG, Souza JRBD, Peixoto CA. Changes in mouse Leydig cells ultrastructure and testosterone secretion after diethylcarbamazine administration. Micron 2008; 39:580-6. [PMID: 17681769 DOI: 10.1016/j.micron.2007.06.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2007] [Revised: 06/15/2007] [Accepted: 06/17/2007] [Indexed: 11/26/2022]
Abstract
Diethylcarbamazine (DEC) has been proven to be highly effective against lymphatic filariasis, although its effect on vertebrate cells remains uncertain. Mice Leydig cells after treatment with 200mg/kg of DEC for 12 days showed numerous lipid droplets, degenerated mitochondria, residual bodies and several giant whorl-like smooth endoplasmic reticulum, some of them encircling large lipids droplets. Treatment with lower dosages showed similar alterations on Leydig cells and the morphological effects decreased directly proportional to the drug concentration. Serum testosterone levels were significantly lower only in 200 mg/kg DEC-treated group when compared to the controls. However, no significant changes were observed in the pregnancy rates and offspring number of DEC-treated male-mated female mice in any doses studied. The results obtained in the present study are consistent with the hypothesis that DEC has some effects on mice Leydig cells, although they were not sufficient enough to interfere with the rodent fertility.
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Affiliation(s)
- Karina Lidianne Alcântara Saraiva
- Departamento de Biologia Celular e Ultraestrutura, Centro de Pesquisas Aggeu Magalhães (FIOCRUZ), e Laboratório de Imunopatologia Keizo Asami (LIKA), Universidade Federal de Pernambuco, Recife, Brazil
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Oliveira ECS, Moura MR, Silva VA, Peixoto CA, Saraiva KLA, de Sá MJC, Douglas RH, de Pinho Marques A. Intratesticular injection of a zinc-based solution as a contraceptive for dogs. Theriogenology 2007; 68:137-45. [PMID: 17559925 DOI: 10.1016/j.theriogenology.2007.03.026] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2006] [Accepted: 03/18/2007] [Indexed: 10/23/2022]
Abstract
The objective of the present study was to evaluate, by light and transmission electron microscopy, the efficacy of a single intratesticular injection of a novel zinc-based solution, as a contraceptive for male dogs. Fifteen mongrel dogs were assigned to three groups (five dogs/group). Group 1, the control group, which consisted of animals ranging from 8 mo to 4 yr, was injected with saline solution. Group 2, which consisted of animals ranging from 8 mo to 1 yr old and Group 3, animals ranging from 2 to 4 yr old, were injected with a zinc-based solution (0.2-1.0mL; volume based on testicular width). There were no histopathological changes detected in testes from control dogs. Histological examination of treated groups revealed degeneration, vacuolation, fewer germ cells, formation of multinucleated giant cells, and a lack of elongated spermatids in atrophic seminiferous tubules. Leydig cells had varying degrees of lipid degeneration and necrosis. The majority of seminiferous tubules in all zinc-treated dogs were lined only by Sertoli cells, which were vacuolated. Ultrastructure of testis of treated groups had degenerate Sertoli and Leydig cells, characterized by numerous mitochondria with the lack of a matrix and agglomeration of lysosomal bodies. The cytoplasm of elongated spermatids was characterized by tubules of hyperplastic and hypertrophic smooth endoplasmic reticulum and numerous Golgi apparati. Round spermatids in Golgi phase had lysis of acrosomal vesicles. The degree of histological changes suggested irreversibility. In conclusion, intratesticular injection of a zinc-based solution effectively impaired spermatogenesis.
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Affiliation(s)
- Erika C S Oliveira
- Laboratory of Animal Reproduction, EV-UFMG, PO Box 567, Belo Horizonte, MG 31270-010, Brazil.
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