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Silva Júnior RA, Desenzi R, Ramires MMS, Souza AF, Donato MAM, Peixoto CA, Nascimento T, Bartolomeu CC, Batista AM. Effects of antifreeze protein from Lolium perenne L. ( LpAFP) in the vitrification of in vitro-produced bovine embryos. ZYGOTE 2023; 31:468-474. [PMID: 37366027 DOI: 10.1017/s0967199423000333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
In the present study, the cryoprotective effects of Lolium perenne antifreeze protein (LpAFP) on the vitrification of bovine embryos were evaluated. In vitro-produced blastocysts were divided into two groups: the control group (CG) without the addition of LpAFP and the treatment group (TG) with the addition of 500 ng/ml of LpAFP in the equilibrium and vitrification solution. Vitrification was carried out by transferring the blastocysts to the equilibrium solution [7.5% ethylene glycol (EG) and 7.5% dimethyl sulfoxide (DMSO)] for 2 min and then to the vitrification solution (15% EG, 15% DMSO and 0.5M sucrose). The blastocysts were deposited on a cryotop device and submerged in liquid nitrogen. Warming was carried out in three steps in solutions with different sucrose concentrations (1.0, 0.5, and 0.0 M, respectively). Embryos were evaluated for re-expansion/hatching, the total cell count, and ultrastructural analysis. There was no significant difference in the re-expansion rate 24 h after warming; however, there was variation (P < 0.05) in the hatching rate in the TG and the total number of cells 24 h after warming was higher in the TG (114.87 ± 7.24) when compared with the CG (91.81 ± 4.94). The ultrastructural analysis showed changes in organelles related to the vitrification process but, in the TG, there was less damage to mitochondria and rough endoplasmic reticulum compared with the CG. In conclusion, the addition of 500 ng/ml of LpAFP during the vitrification of in vitro-produced bovine embryos improved the hatching rate and total cell number of blastocysts after warming and mitigated intracellular damage.
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Affiliation(s)
- R A Silva Júnior
- Laboratório de Biotécnicas Aplicadas à Reprodução, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil
| | - R Desenzi
- Laboratório de Biotécnicas Aplicadas à Reprodução, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil
| | - M M S Ramires
- Departamento de Zootecnia, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil
| | - A F Souza
- Departamento de Zootecnia, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil
| | - M A M Donato
- Departamento de Histologia e Embriologia, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil
| | - C A Peixoto
- Laboratory of Ultrastructure, Aggeu Magalhães Institute (IAM), Recife, PE, Brazil; National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM, CNPq), Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - T Nascimento
- Departamento de Botânica, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - C C Bartolomeu
- Laboratório de Biotécnicas Aplicadas à Reprodução, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil
| | - A M Batista
- Laboratório de Biotécnicas Aplicadas à Reprodução, Departamento de Medicina Veterinária, Universidade Federal Rural de Pernambuco, Recife, Pernambuco, Brazil
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Silva A, Silva S, Silva I, Santos S, Laranjeira P, Geraldes C, Silva H, Sarmento-Ribeiro AB, Nascimento T, Domingues P, Paiva A. Bone marrow follicular-like T cells in monoclonal gammopathies. Cytometry B Clin Cytom 2021; 102:70-72. [PMID: 34245490 DOI: 10.1002/cyto.b.22029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 06/18/2021] [Accepted: 06/29/2021] [Indexed: 11/06/2022]
Affiliation(s)
- Ana Silva
- Flow Cytometry Unit, Clinical Pathology Department, Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal.,Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Sandra Silva
- Flow Cytometry Unit, Clinical Pathology Department, Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal
| | - Isabel Silva
- Flow Cytometry Unit, Clinical Pathology Department, Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal
| | - Susana Santos
- Flow Cytometry Unit, Clinical Pathology Department, Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal
| | - Paula Laranjeira
- Flow Cytometry Unit, Clinical Pathology Department, Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal.,Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, Coimbra, Portugal.,Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, Coimbra, Portugal.,Center for Neuroscience and Cell Biology (CNC), University of Coimbra, Coimbra, Portugal
| | - Catarina Geraldes
- Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, Coimbra, Portugal.,Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, Coimbra, Portugal.,Clinical Academic Center of Coimbra (CACC), Coimbra, Portugal.,Laboratory of Oncobiology and Haematology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal.,Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal
| | - Helena Silva
- Clinical Hematology Department, Centro Hospitalar Tondela-Viseu EPE, Viseu, Portugal
| | - Ana Bela Sarmento-Ribeiro
- Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, Coimbra, Portugal.,Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, Coimbra, Portugal.,Clinical Academic Center of Coimbra (CACC), Coimbra, Portugal.,Laboratory of Oncobiology and Haematology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal.,Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal
| | - Telma Nascimento
- Clinical Hematology Department, Centro Hospitalar do Baixo Vouga EPE, Aveiro, Portugal
| | - Pedro Domingues
- Department of Chemistry, Mass Spectrometry Centre, LAQV Requimte, University of Aveiro, Aveiro, Portugal
| | - Artur Paiva
- Flow Cytometry Unit, Clinical Pathology Department, Centro Hospitalar e Universitário de Coimbra EPE, Coimbra, Portugal.,Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, Coimbra, Portugal.,Center for Innovative Biomedicine and Biotechnology (CIBB), University of Coimbra, Coimbra, Portugal.,Ciências Biomédicas Laboratoriais, ESTESC-Coimbra Health School, Instituto Politécnico de Coimbra, Coimbra, Portugal
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Afonso C, Roque A, Nascimento T, Sarmento A, Geraldes C, Paiva A, Ribeiro L. PS1413 INCIDENCE OF NEGATIVE MINIMAL RESIDUAL DISEASE IN MULTIPLE MYELOMA PATIENTS AFTER AUTOLOGOUS STEM CELL TRANSPLANT. Hemasphere 2019. [DOI: 10.1097/01.hs9.0000563928.27154.17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Dias T, Ferreira D, Moreira H, Nascimento T, Santos A, Carvalho A. A Case of Severe Cholestasis due to Hepatic AL Amyloidosis. GE Port J Gastroenterol 2019; 26:425-429. [PMID: 31832498 DOI: 10.1159/000496185] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 12/11/2018] [Indexed: 12/23/2022]
Abstract
Introduction Immunoglobulin light chain-associated amyloidosis results from extracellular tissue deposition of fibril-forming monoclonal immunoglobulin light chains, secreted by a clone of plasma cells. Although the liver is often involved histologically, most cases are clinically asymptomatic, and severe intrahepatic cholestasis as the primary manifestation of the disease is rare. Clinical Case We report an unusual case of primary amyloidosis in a 71-year-old man, presenting with rapidly progressive cholestasis, associated with hepatomegaly. There are a few reported cases in the literature of cholestasis and acute liver failure as the first manifestations of AL amyloidosis. Conclusion Infiltrative diseases, such as amyloidosis, must be considered when a patient presents with cholestatic hepatitis. A liver biopsy is essential for the diagnosis of amyloidosis when liver test abnormalities dominate the initial clinical presentation. Liver involvement in patients with amyloidosis is often an indicator of poor prognosis.
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Affiliation(s)
- Teresa Dias
- Department of Internal Medicine, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.,Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Diana Ferreira
- Department of Internal Medicine, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.,Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Hélder Moreira
- Department of Pathology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
| | - Telma Nascimento
- Department of Hematology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal
| | - Arsénio Santos
- Department of Internal Medicine, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.,Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - Armando Carvalho
- Department of Internal Medicine, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.,Faculty of Medicine, University of Coimbra, Coimbra, Portugal
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Rached F, Brito F, Garzillo C, Nascimento T, Perin M, Serrano C. Association between preprocedural non-high-density lipoprotein cholesterol levels with the inflammatory response following elective percutaneous coronary intervention. Atherosclerosis 2016. [DOI: 10.1016/j.atherosclerosis.2016.07.291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Menezes D, Barbosa A, Rodrigues R, Lista F, Nascimento T, Moraes S, Queiroz M, Busato K. In vitro gas production and degradation kinetics of elephant grass silage with dried tamarind residue. J Anim Feed Sci 2016. [DOI: 10.22358/jafs/65561/2016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Proietti R, Essebag V, Beardsall J, Hache P, Pantano A, Wulffhart Z, Juta R, Tsang B, Joza J, Nascimento T, Pegoraro V, Khaykin Y, Verma A. Substrate-guided ablation of haemodynamically tolerated and untolerated ventricular tachycardia in patients with structural heart disease: effect of cardiomyopathy type and acute success on long-term outcome. Europace 2014; 17:461-7. [DOI: 10.1093/europace/euu326] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Almeida R, Marques M, Espírito Santo H, Moitinho S, Vigário V, Pena I, Matreno J, Rodrigues F, Antunes E, Simões D, Costa A, Correia A, Pimentel A, Alves V, Nascimento T, Costa M, Tomaz M, Caldas L, Ferreira L, Simões S, Guadalupe S, Lemos L, Daniel F. 1230 – Selective attention and cognitive decline in institutionalized elderly. Eur Psychiatry 2013. [DOI: 10.1016/s0924-9338(13)76308-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Nascimento T, Cardoso M, Presado H, Carvalho A. 157 SEXUAL SATISFACTION IN MIDDLE AGE. Maturitas 2012. [DOI: 10.1016/s0378-5122(12)70268-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Nascimento T, Mota F, dos Santos LF, de Araujo S, Okada M, Franco M, de Paola A, Fenelon G. Impact of prophylactic corticosteroids on systemic inflammation after extensive atrial ablation in pigs. Europace 2011; 14:138-45. [DOI: 10.1093/europace/eur259] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Arfelli E, de Araujo S, Okada M, Nascimento T, dos Santos LFN, Franco M, de Paola AAV, Fenelon G. Impact of corticosteroids on late growth of radiofrequency lesions in infant pigs: histopathological and electroanatomical findings. Europace 2010; 13:121-8. [DOI: 10.1093/europace/euq391] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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De Castro-e-Silva E, Luz CP, Marinho CA, Castro L, Sarmento C, Gonzalez V, Oliveira P, Nascimento T, Santana P, Lima AK, Fregoneze JB. Central administration of zinc increases renal sodium and potassium excretion in rats. Brain Res 1999; 845:176-84. [PMID: 10536196 DOI: 10.1016/s0006-8993(99)01930-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
The aim of the present study was to investigate the effect of acute third ventricle injections of zinc on the brain control of renal sodium and potassium excretion. Adult Wistar male rats received third ventricle injections of zinc acetate in three different doses (0.03, 0.3 and 3.0 nmol/rat). Third ventricle administration of zinc acetate provoked a significant intensification of natriuresis and kaliuresis as compared to sodium acetate-treated controls. When rats were pretreated with losartan, a selective angiotensin II AT1 receptor antagonist (10.8 nmol/rat into the third ventricle 10 min before central zinc injection) the increase in both natriuresis and kaliuresis was abolished. Furthermore, pretreatment with gadolinium, a calcium channel blocker (0.3 nmol/rat into the third ventricle 20 min before central zinc injection), also blunted the increase in renal sodium and potassium excretion seen in animals receiving zinc alone. In a group of rats receiving the same water load used in the previous experiments, the injection of zinc acetate into the third ventricle (3.0 nmol/rat) did not modify arterial blood pressure. It is suggested that zinc in the central nervous system may be involved in the control of renal sodium and potassium excretion by a mechanism unrelated to blood pressure increase. It is also shown that both natriuretic and kaliuretic actions of zinc depend on AT1 receptor activation. Whatever should be the mechanism(s) related to the central effects of zinc here evidenced, the functional integrity of calcium channels is required.
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Affiliation(s)
- E De Castro-e-Silva
- Department of Physiology, Health Sciences Institute, Federal University of Bahia, 40110-100, Salvador, BA, Brazil
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Fregoneze JB, Luz CP, Sarmento C, Gonzalez V, Oliveira P, Santana P, Marinho CA, Castro L, Nascimento T, De Paula S, Lima AK, De Oliveira IR, De Castro-e-Silva E. Central lead administration induces natriuretic and kaliuretic effects in rats. Physiol Behav 1998; 65:321-6. [PMID: 9855482 DOI: 10.1016/s0031-9384(98)00172-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The aim of the present experiments was to discern whether central acute lead injections affect brain control of renal function. Adult Wistar male rats received third-ventricle injections of lead acetate in three different doses (0.03, 0.3, and 3.0 nmol/rat). Lead acetate induced a significant increase in renal excretion of sodium and potassium. Pretreatment with losartan, a selective angiotensin II AT1 receptor antagonist (10.8 nmol/rat into the third ventricle 10 min before central lead injection), inhibits lead-induced natriuretic and kaliuretic effects. In addition, pretreatment with gadolinium, a calcium-channel blocker (0.3 nmol/rat into the third ventricle 20 min before central lead administration), reversed the increase in renal excretion of sodium and potassium provoked by central lead administration. Taken together, the data presented here suggest that lead injected into the third ventricle increases renal excretion of sodium and potassium by a mechanism that depends on the functional integrity of central angiotensin II AT1 receptors and calcium channels.
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Affiliation(s)
- J B Fregoneze
- Department of Zoology, Biology Institute, Federal University of Bahia, Salvador, Brazil
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Luz CP, De Castro-e-Silva E, Marinho CA, Castro L, Sarmento C, Gonzalez V, Oliveira P, Nascimento T, Santana Júnior P, De Paula S, Lima AK, Fregoneze JB. Natriuretic and kaliuretic effects of central acute cadmium administration in rats. Brain Res 1998; 796:265-72. [PMID: 9689477 DOI: 10.1016/s0006-8993(98)00250-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
We studied the acute effects of cadmium third ventricle injections on renal excretion of water, sodium and potassium in rats previously submitted to an oral water load equivalent to 10% of their body weight. Injections of cadmium chloride (0.03, 0.3, and 3.0 nmol/rat) significantly increased sodium and potassium renal excretion without changing urine flow. Pretreatment with losartan, an angiotensin II AT1 receptor antagonist (10.8 nmol/rat into the third ventricle 10 min before central cadmium administration) inhibits the natriuretic effect of this metal, being unable to reverse its kaliuretic effect. Pretreatment with gadolinium, a calcium-channel blocker (0.3 nmol/rat into the third ventricle 20 min before central cadmium administration) abolishes both the natriuretic and the kaliuretic response of cadmium. The data clearly show that cadmium injections into the third ventricle disturb central regulation of renal function leading to an increased renal loss of sodium and potassium. It is also evident that the natriuretic action of the metal depends on an increase in brain angiotensin II release. Also, the functional integrity of calcium channels is required for the expression of both the natriuretic and the kaliuretic effects of the metal.
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Affiliation(s)
- C P Luz
- Department of Physiology, Health Sciences Institute, Federal University of Bahia, Brazil
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De-Castro-e-Silva E, Luz CP, Sarmento C, Nascimento T, Gonzalez V, Marinho CA, Castro L, Oliveira P, Santana Júnior P, De-Oliveira IR, De-Paula S, Lima AK, Fregoneze JB. Opiatergic participation in the thirst-inhibiting effect of acute third ventricle injections of cadmium (Cd2+) and lead (Pb2+). Braz J Med Biol Res 1998; 31:805-10. [PMID: 9698827 DOI: 10.1590/s0100-879x1998000600013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
We have previously demonstrated that acute third ventricle injections of both lead and cadmium prevent the dipsogenic response elicited by dehydration or by central injections of dipsogenic agents such as angiotensin II, carbachol and isoproterenol in rats. We have also shown that the antidipsogenic action of cadmium may be due, at least in part, to activation of thirst-inhibitory central serotonergic pathways. In the present paper we show that in Wistar male rats the antidipsogenic effect of both lead acetate (3.0 nmol/rat) and cadmium chloride (3.0 nmol/rat) may be partially dependent on the activation of brain opiatergic pathways since central injections of naloxone (82.5 nmol/rat), a non-selective opioid antagonist, blunt the thirst-inhibiting effect of these metals. One hundred and twenty minutes after the second third ventricle injections, dehydrated animals (14 h overnight) receiving saline + sodium acetate displayed a high water intake (7.90 +/- 0.47 ml/100 g body weight) whereas animals receiving saline + lead acetate drank 3.24 +/- 0.47 ml/100 g body weight. Animals receiving naloxone + lead acetate drank 6.94 +/- 0.60 ml/100 g body weight. Animals receiving saline + saline drank 8.16 +/- 0.66 ml/100 g body weight whilst animals receiving saline + cadmium chloride drank 1.63 +/- 0.37 ml/100 g body weight. Animals receiving naloxone + cadmium chloride drank 8.01 +/- 0.94 ml/100 g body weight. It is suggested that acute third ventricle injections of both lead and cadmium exert their antidipsogenic effect by activating thirst-inhibiting opioid pathways in the brain.
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Affiliation(s)
- E De-Castro-e-Silva
- Departamento de Fisiologia, Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador, BA, Brasil
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Fregoneze JB, Marinho CA, Soares T, Castro L, Sarmento C, Cunha M, Gonzalez V, Oliveira P, Nascimento T, Luz CP, Santana Júnior P, De-Oliveira IR, De-Castro-e-Silva E. Lead (Pb2+) and cadmium (Cd2+) inhibit the dipsogenic action of central beta-adrenergic stimulation by isoproterenol. Braz J Med Biol Res 1997; 30:419-23. [PMID: 9246242 DOI: 10.1590/s0100-879x1997000300018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
We have previously demonstrated that acute third ventricle injections of both Pb2+ and Cd2+ impair the dipsogenic response elicited by three different situations: dehydration and central cholinergic or angiotensinergic stimulation. beta-Adrenergic activation is part of the multifactorial integrated systems operating in drinking behavior control in the central nervous system. In the present study acute third ventricle injections of Pb2+ (3, 30 and 300 pmol/rat) or Cd2+ (0.3, 3 and 30 pmol/ rat) blocked the dipsogenic response induced by third ventricle injections of isoproterenol (ISO; 160 nmol/rat) in a dose-dependent manner. Normohydrated animals receiving ISO + NaAc (sodium acetate) or saline (controls) displayed a high water intake after 120 min (ISO+saline = 5.78 +/- 0.54 ml/100 g; ISO+NaAc = 6.00 +/- 0.6 ml/100 g). After the same period, animals receiving ISO but pretreated with PbAc at the highest dose employed (300 pmol/rat) drank 0.78 +/- 0.23 ml/100 g while those receiving ISO and pretreated with the highest dose of CdCl2 (30 pmol/rat) presented a water intake of 0.7 +/- 0.30 ml/100 g. Third ventricle injections of CdCl2 (3 nmol/rat) or PbAc (3 nmol/rat) did not modify food intake in rats deprived of food for 24 h. Thus, general central nervous system depression explaining the antidipsogenic action of the metals can be safely excluded. It is concluded that both Pb2+ and Cd2+ inhibit water intake induced by central beta-adrenergic stimulation.
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Affiliation(s)
- J B Fregoneze
- Departamento de Zoologia, Universidade Federal da Bahia, Salvador, Brasil
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DeCastro-e-Sliva E, Marinho CA, Soares T, Castro L, Sarmento C, Cunha M, Gonzales V, Oliveira P, Nascimento T, Luz CP, Santana Júnior P, DeOliveira IR, Fregoneze JB. Calcium channel blockers inhibit the antidipsogenic effect of central injections of zinc in rats. Braz J Med Biol Res 1996; 29:1651-5. [PMID: 9222427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Previous data from our laboratory have indicated that acute third ventricle injections of Zn2+ elicit a significant antidipsogenic response in rats in three different situations; dehydration, and central angiotensinergic or cholineric stimulation. In the present study we analyzed whether this response depends on voltage-dependent calcium channels. Dehydrated (14 h of water deprivation, overnight) animals received 2-microliters i.c.v. injections of zinc acetate (Zn(Ac)2; 300 pmol/rat) after pretreatment with the voltage-dependent calcium channel blockers gadolinium (Gd3+; 0.03, 3.0 and 30 pmol/rat) or verapamil (VER; 0.027, 0.05 and 0.11 pmol/rat). Both blockers reserved the antidipsogenic effect of third ventricle injections of Zn2+ in a dose-dependent manner. After 120 min, animals pretreated with saline receiving Zn(Ac)2 drank 3.10 +/- 0.57 ml/100 g body weight while those pretreated with Gd3+ at the highest dose displayed a water intake of 5.45 +/- 0.41 ml/100 body weight (P < 0.01). Animals pretreated with the vehicle of VER receiving Zn(Ac)2 drank 3.15 +/- 0.45 ml/100 g while animals pretreated with VER at the highest dose receiving Zn(Ac)2 drank 6.16 +/- 0.62 ml/100 g (P < 0.01). The antidipsogenic effect of Zn(Ac)2 seems to be specific since the metal (same dose and injection procedures) did not modify food intake in rats after 24 h of food deprivation. It is suggested that Zn2+ exerts its antidipsogenic effect by activation of mechanism(s) depending on the functional integrity of voltage-dependent calcium channels.
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Affiliation(s)
- E DeCastro-e-Sliva
- Departamento de Zoologia, Universidade de Federal de Bahia, Salvador, Brasil
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Fregoneze JB, Ferreira H, Soares T, Luz CP, Bulcão C, Nascimento T, Marinho CA, Sarmento C, De-Oliveira IR, Cunha M. SDZ 216-525, a selective 5-HT1A receptor antagonist, reverts zinc-induced inhibition of water intake in dehydrated rats. Braz J Med Biol Res 1995; 28:711-4. [PMID: 8547857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Zinc is found in many brain regions where it participates in important processes such as neurotransmission and neuromodulation. We previously demonstrated that acute third ventricle injection of zinc inhibits water intake in dehydrated rats. The present study was undertaken to explore a possible link between zinc-induced inhibition of water intake in dehydrated rats and serotonergic systems in the brain. Adult, male Wistar rats had the third ventricle cannulated a week before the experiments. After an overnight period of water deprivation, the animals (N = 12 per group) received acute intracerebroventricular injections (2 microliters) of Zn(Ac)2 (6.7, 67.1 and 671.6 ng/rat). Control animals (N = 12) received NaAc (671.6 ng/rat). Zinc-treated animals displayed a significant, dose-dependent reduction in water intake. Water intake after 120 min was 7.70 +/- 0.50 ml in control (NaAc-treated) dehydrated rats while animals treated with the highest dose of Zn(Ac)2 drank 2.63 +/- 0.73 ml. Third ventricle injections of SDZ 216-525, a selective 5-HT1A receptor antagonist, 45 min before zinc administration, generated a dose-dependent reversal of zinc-induced thirst blockade in water-deprived rats. At the highest dose used (10 micrograms/rat), the water intake of the animals after 120 min was 7.30 +/- 0.23 ml, a value equal to that of control animals. These data suggest that zinc may decrease water intake in dehydrated rats by activation of a 5-HT1A receptor-related mechanism.
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Affiliation(s)
- J B Fregoneze
- Departamento de Fisiologia, Universidade Federal da Bahia, Salvador, Brasil
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