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Effect of glutathione on the function and oxidative status of ovine cryopreserved sperm | Efeito da adição de glutationa na função e estresse oxidativo em sêmen ovino criopreservado
2013
Eduardo Gualtieri de Andrade Perez | Marcilio Nichi | Carlos Henrique Cabral Viana | Rodrigo Otávio Correia da Silva | Andressa Dalmazzo | Paola Almeida de Araújo Góes | João Rafael Chinait Gurgel | Valquiria Hyppolito Barnabe | Renato Campanarut Barnabe
<p class="Default">The high susceptibility of sperm to the oxidative stress occurs especially due to high content of poly-unsaturated fattyacids (PUFAs) in its plasma membrane. The PUFAs provide the necessary fluidity to the plasma membrane. Howeverdouble bonds present in those fatty acids are more susceptible to oxidative stress. Studies in human indicate thatcryopreservation may lead to damages to the sperm due to oxidative stress. This study aimed to verify if the antioxidantglutathione (GSH) may protect ovine cryopreserved sperm against damages caused by oxidative stress. Semen samplesof four rams were cryopreserved using Tris-egg yolk extender supplemented with different concentrations of reducedglutathione (control, 1, 5 and 10 mM). After thawing, samples were evaluated using conventional (motility and vigor)and functional tests (membrane integrity and mitochondrial activity). Aliquots of each thawed sample were submitted toprotocol of induced lipid peroxidation using ascorbate (20 mM) and ferrous sulphate (4 mM), with further measurementof tiobarbituric acid reactive substances (TBARS), index of oxidative stress. No effect of GSH was observed on variablesassessed by conventional tests. GSH decreased the proportion of intact acrosomes. Samples treated with 5 mM GSHshowed lower percentage of intact membrane cells when compared to control samples and those treated with 10 mM.The percentage of cells with mitochondrial activity was affected by GSH, but no effect on TBARS. Samples from controlgroup were more susceptible to denaturation of chromatin. In conclusion, the addition of Glutathione (GSH) offersprotection to DNA and mitochondrial activity of ovine sperm.</p> | Os ácidos graxos poli-insaturados garantem fluidez à membrana plasmática do espermatozoide. No entanto, as duplas ligações presentes, os tornam mais susceptíveis aos efeitos nocivos da peroxidação lipídica. A adição do antioxidante Glutationa reduzida (GSH) poderia conferir proteção aos espermatozoides de ovinos submetidos à congelação contra os graves danos causados pelo estresse oxidativo. O objetivo do presente experimento foi avaliar se a GSH protege os espermatozoides ovinos criopreservados contra danos causados pelo estresse oxidativo. Foram colhidos ejaculados de quatro carneiros adultos. As análises convencionais foram: concentração, motilidade, vigor e morfologia. As análises funcionais foram: integridade de membrana, integridade acrossomal, integridade de cromatina e atividade mitocondrial. O sêmen foi criopreservado utilizando o diluidor Tris-gema-critrato, suplementado com GSH (controle, 1, 5 e 10 mM). As amostras foram submetidas ao protocolo de peroxidação lipídica induzida e subsequente quantificação das substâncias reativas ao ácido tiobarbitúrico (TBARS). As análises estatísticas foram realizadas utilizando o Sistema SAS para Windows. Não houve efeito do tratamento com GSH sobre as variáveis avaliadas pelos testes convencionais. A GSH diminuiu a proporção de acrossomas íntegros. Amostras tratadas com 5mM de GSH apresentaram menor percentual de células com membranas íntegras quando comparadas às amostras controle e aquelas tratadas com 10 mM; o percentual de células sem atividade mitocondrial foi influenciado pela GSH e também não houve efeito nas TBARS. As amostras do grupo controle foram mais susceptíveis à denaturação da cromatina. Em conclusão, a adição do antioxidante Glutationa reduzida confere proteção ao DNA e à atividade mitocondrial de espermatozoides de ovinos.
اظهر المزيد [+] اقل [-]Inquérito sorológico de lentiviroses de pequenos ruminantes (Maedi-Visna e artrite-encefalite caprina) no estado de São Paulo | Serologic survey of small ruminants lentiviruses (Maedi-Visna and caprine arthritis-encephalitis) in São Paulo state
2013
Maria do Carmo Custódio de Souza Hunold Lara | Eliana Monteforte Cassaro Villalobos | Elenice Maria Sequetin Cunha | Daniela Chiebao | Fabio Henrique Gabriel | Lília Paulin | Vanessa Castro | Alessandra Figueiredo de Castro Nassar | Rosa Piatti | Liria Okuda | Adriana Hellmeister de Campos Nogueira Romaldini | Igor Stefan Popovic Federsoni | Anselmo Lucchese Filho | Artur Luiz de Almeida Felício | Francisco Alberto Pino | Sérgio Santos Azevedo | Maristela Vasconcellos Cardoso
O objetivo deste estudo foi determinar a frequência de animais soropositivos ao vírus da Maedi-Visna (MVV) em ovinos e ao vírus da CAE (CAEV) em caprinos criados no estado de São Paulo. Na pesquisa dos anticorpos séricos anti- MVV e anti-CAEV foi utilizada a técnica de imunodifusão em gel de ágar (IDGA). Dentre os ovinos estudados, 0,3% (4/1235) eram sororreagentes ao MVV e 15,1% caprinos (30/199) ao CAEV. Foi realizada a análise de fatores de risco associados à condição de propriedade positiva para CAEV e Maedi-Visna. Foram selecionadas variáveis para as duas enfermidades, no entanto, quando essas variáveis foram usadas na regressão logística múltipla, não foram identificados fatores de risco para as infecções. A infecção pelo CAEV no estado de São Paulo tem uma ampla disseminação e com uma alta prevalência enquanto que o MVV apresenta baixa prevalência. Ressalta-se a importância de medidas de prevenção e controle para diminuir a ocorrência da CAE e evitar a disseminação da Maedi-Visna. | The aim of this study was to carry out the serological occurrence of Maedi-Visna virus (MVV) and CAE virus (CAEV) in ovines and caprines breeding in São Paulo state. The test to detect MVV and CAEV antibodies was agar gel immunodiffusion (AGID). The detection of antibodies against MVV was 0,3% (4/1235) and against CAEV was 15,1% (30/199). Was carried analysis of risk factors associated with the presence of positive property for CAEV and Maedi-Visna. Variables were selected for both diseases, however, when these variables were used in multivariate logistic regression model were not identified risk factors for the infections. The CAEV infection in the São Paulo state has a wide spread and a high prevalence while MVV has low prevalence. It emphasizes the importance of prevention and control measures to reduce CAEV occurrence and prevent the spread of Maedi-Visna.
اظهر المزيد [+] اقل [-]Falha da transferência de imunidade passiva em cordeiros mestiços (Santa Inês x Dorper) e estudo do proteinograma do nascimento até o desmame | Failure of passive immunity transfer in crossbred lambs (Santa Inês x Dorper) and proteinogram study from birth until waned
2013
Joselito Nunes Costa | Débora de Fátima Matias da Silva | Carla Caroline Valença de Lima | Thiago Sampaio de Souza | Alexandre Lôpo Araújo | Antônio Oliveira Costa Neto | Maria Angela Ornelas de Almeida
<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--><p class="MsoNormal">Analisou-se a ocorrência da Falha de Transferência da Imunidade Passiva (FTIP) em 45 cordeiros nascidos de ovelhas saudáveis e pluríparas. Estes animais foram acompanhados do nascimento até o desmame (90 dias), por meio de avaliações físicas, do hemograma, determinação de proteínas séricas totais e seu fracionamento eletroforético entre 24-72h pós-nascimento (p.n.), aos 7, 15, 30, 60 e 90 dias de idade (quando era realizada a desmama). Adotando-se o ponto de corte para proteínas séricas totais da ordem de 4,5g/dL, obteve-se a ocorrência de FTIP de 24,4% (11 animais). Os cordeiros com FTIP apresentaram menores valores (p<0,05) de proteínas séricas, albumina, alfaglobulina, betaglobulina 1 e gamaglobulinas entre 24-72h p.n. quando comparados aos dos 34 animais que não tiveram FTIP. Porém, a partir dos sete dias de vida não foram observadas diferenças significativas destas variáveis entre os grupos, o que indica um processo de produção ativa de proteínas pelo grupo com FTIP.</p><!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <w:HyphenationZone>21</w:HyphenationZone> <w:PunctuationKerning/> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:DoNotPromoteQF/> <w:LidThemeOther>PT-BR</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <w:SnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <w:DontGrowAutofit/> <w:SplitPgBreakAndParaMark/> <w:EnableOpenTypeKerning/> <w:DontFlipMirrorIndents/> <w:OverrideTableStyleHps/> </w:Compatibility> 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mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-fareast-language:EN-US;} </style> <![endif]--> | <!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG/> </o:OfficeDocumentSettings> </xml><![endif]--><p class="MsoNormal"><span style="mso-ansi-language: EN-US;" lang="EN-US">It was analyzed the occurrence of the failure of passive transfer (FTIP) of the immunity 45 born lambs of healthy and pluriparous ewes. These animals were accompanied from the birth to the wean (90 days), when clinical evaluations were accomplished, hemogram, determination of total serum proteins and their electrophoretic fractions, 24-72h after the birth, to the 7, 15, 30, 60 and 90 days of age (at the same time of the wean). Adopting the cut point for total serum proteins of the order of 4.5g/dL, it was obtained the occurrence of FTIP of 24.4% (11 animals). The lambs with FTIP presented lowers values (p<0.05) of serum proteins, albumin, alpha-globulin, beta-globulin 1 and gamma globulins when compared to the 34 animals that have no FTIP. However, from 7th days of life it was not observed significant differences of these variables between groups, indicating the occurrence of a process of active production of proteins by group FTIP.</span></p>
اظهر المزيد [+] اقل [-]