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Comparison of the neuron bodies number in different gyrus of brain cortex of malnourished dogs | Efeitos comportamentais da exposição aguda ao gliposato em camundongos Balb/c machos e fêmeas
2013
Andréia de Oliveira Joaquim | Helenice de Souza Spinosa | Daclé Juliane Macrini | Paula Andreotti Rodrigues | Esther Lopes Ricci | Thais Spaggiari Artiolli | Natália Moreira | Ivana Barbosa Suffredini | Maria Martha Bernardi
<!--[if gte mso 9]><xml> <o:OfficeDocumentSettings> <o:AllowPNG /> </o:OfficeDocumentSettings> </xml><![endif]--> <p class="MsoNormal" style="text-align: justify;"><span style="mso-ansi-language: EN-US;" lang="EN-US">The aim of this study was to verify the quantitative alterations of the neurons bodies in the brain cortex of malnourished dogs. Seven brains of mongrel male dogs that were previously diagnosticated as malnourished were collected. The dogs had similar constitutionalist characteristics of cranium (mesaquicefalus). It was chosen different gyrus of the brain cortex to been study; those gyrus were sampled, prepared according to conventional histological technique and stained by modified cresil violet, for becoming evident the neurons bodies. The slides were analyzed with the 20x ocular. Our results indicate an expressive reduction in the number of neuron bodies in malnourished dogs (10,8), when compared with dogs in normal nutrition conditions (16,35). In conclusion, it’s possible that the malnutrition leads to a reduction of neurons bodies in brain cortex of dogs, when compared to those with normal condition of nutrition.</span></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-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; 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]--> | <p>Neste trabalho investigou-se em camundongos BALB/c, machos e fêmeas, os efeitos comportamentais da exposição aguda a uma formulação comercial do glifosato (GF) em uma dose duas vezes maior que a dose sem efeito observado(NOAEL). A neurotoxicidade aguda ao GF foi determinada por meio da análise da atividade geral, de parâmetros sensoriais, psicomotores, do sistema nervoso central e autônomo em machos e fêmeas. Os efeitos exploratório, de ansiedade e depressão induzidos pelo GF foram observados no campo aberto, labirinto em cruz elevado e no teste da suspensão da cauda, respectivamente. O GF promoveu poucos sinais de neurotoxicidade. A capacidade exploratória de fêmeas foi reduzida no campo aberto. Nenhum sinal de ansiedade foi detectado tanto em machos como em fêmeas no labirinto em cruz elevado, porém, notou-se redução da exploratória neste aparelho. No teste de suspensão da cauda tanto as fêmeas como machos mostraram aumento no tempo de imobilidade. Não foi observado neste caso interação entre sexo e tratamento. Concluiu-se que a exposição ao dobro da dose da NOAEL do GF induziu poucos sinais de neurotoxicidade e poucos efeitos sexualmente dimórficos em camundongos machos e fêmeas.</p>
Показать больше [+] Меньше [-]Glyphosate-Roundup exposure delays puberty onset in male rats | A exposição ao glifosato-Roundup causa atraso no início da puberdade em ratos machos
2008
Renata Marino Romano | Marco Aurélio Romano | Maurício Osvaldo Moura | Cláudio Alvarenga de Oliveira
The effects of herbicides and it's adjuvants can be responsible for several alterations in reproductive organs of male and female. Since glyphosate-Roundup penetrates in the cell, it reduces the activity of StAR protein and aromatase enzime. This study evaluated the development of pubertal characteristics in animals receiving oral dosages of glyphosate-Roundup by gavage, by daily body weight measurement and verification of preputial separation (PPS). 32 male rats were allocated in 4 groups of treatments (0, 5, 50 e 250 mg/kg) from 23 to 53 days of age. The body weight from 23 to 53 days was compared using analysis of MANCOVA, Kruskall-Wallis was used to compare the day at PPS and ANOVA was used to compare the body weight at PPS. Age at PPS was different between groups 50 mg/kg and 0 mg/kg (36,6±0,5; 36 days; p<0,05), 250 mg/kg and 0 mg/kg (37,2±0,4; 36 days; p<0,001) and 5 mg/kg and 250 mg/kg (36,5±0,5; 36 days; p<0,05). The body weight at PPS was higher in group of 250 mg/kg n comparison to groups of 0 mg/kg and 5 mg/kg (142,7 ± 9,3; 128,9 ± 5,4; 126,1 ± 8,8 g, respectively; p<0,001). The body weight of group 50 mg/kg (134,1 ± 9,2g) wasn't differ from another groups. Probably, the daily exposure to glyphosate-Roundup causes endocrine disruption in hypothalamic-pituitary-gonad axis during sexual maturation, because it delayed the onset of puberty. | Os efeitos causados pelas substâncias contidas nos pesticidas e adjuvantes podem ser responsáveis por inúmeras alterações no sistema reprodutivo de machos e de fêmeas. A partir do momento que o glifosato-Roundup penetra na célula ele reduz a atividade da proteína StAR e da enzima aromatase. Este trabalho avaliou a possível correlação entre o desenvolvimento das características puberais em animais expostos diariamente ao herbicida glifosato, pela observação do crescimento e desenvolvimento e do início do período púbere. Utilizou-se 32 ratos machos divididos em 4 grupos de tratamentos (0, 5, 50 e 250 mg/kgPV), dos 23 aos 53 dias de idade. Utilizou-se análise de MANCOVA para a comparação dos pesos corporais, Kruskall-Wallis para o dia e ANOVA para o peso ao descolamento do prepúcio. Não houve interferências do tratamento sobre o crescimento dos animais em nenhum grupo. A idade à puberdade foi significativamente diferente entre os grupos 50 mg/kg e 0 mg/kg (36,6±0,5; 36 dias; p<0,05), 250 mg/kg e 0 mg/kg (37,2±0,4; 36 dias; p<0,001) e 5 mg/kg e 250 mg/kg (36,5±0,53; 36 dias; p<0,05). O peso à puberdade foi maior no grupo de 250 mg/kg em relação aos grupos de 0 mg/kg e 5 mg/kg (142,7 ± 9,3; 128,9 ± 5,4; 126,1 ± 8,8 g, respectivamente; p<0,001). O peso do grupo de 50 mg/kg (134,1 ± 9,2g) não foi diferente dos outros grupos. É provável que a exposição crônica ao herbicida glifosato-Roundup cause a disrupção endócrina no eixo hipotalâmico-hipofisário-gonadal durante a maturação sexual, pela evidenciação do atraso no início da puberdade.
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