Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 14 de 14
Filtrar
Mais filtros










Intervalo de ano de publicação
1.
Braz. j. biol ; 83: e247539, 2023. tab
Artigo em Inglês | LILACS-Express | LILACS, VETINDEX | ID: biblio-1278542

RESUMO

Abstract Numerous studies have investigated the chemical composition and biological activities of essential oils from different Citrus species fruit peel, leaves and flowers. This paper aims to investigate the chemical composition, larvicidal and antileishmanial activities of essential oil from Citrus reticulata fruit peel (CR-EO). CR-EO was obtained by hydrodistillation in a Clevenger-type apparatus and its chemical composition was analyzed by GC-MS and GC-FID. Limonene (85.7%), ɣ-terpinene (6.7%) and myrcene (2.1%) were identified as its major components. CR-EO showed high activity against promastigote forms of Leishmania amazonensis (IC50 = 8.23 µg/mL). CR-EO also exhibited high larvicidal activity against third instar Aedes aegypti larvae at a lethal concentration (LC50 = 58.35 µg/mL) and 100% mortality at 150 µg/mL. This study suggests, for the first time, the potential use of CR-EO against this important mosquito-borne viral disease caused by the genus Aedes.


Resumo Numerosos estudos têm investigado a composição química e as atividades biológicas de óleos essenciais extraídos de cascas dos frutos, folhas e flores de diferentes espécies de Citrus. Este trabalho tem como objetivo investigar a composição química e as atividades larvicida e leishmanicida in vitro do óleo essencial das cascas dos frutos de Citrus reticulata (CR-EO). CR-EO foi obtido pela técnica de extração em aparelho Clevenger e sua composição química foi determinada por CG-EM e CG-DIC. Limoneno (85,7%), ɣ-terpineno (6,7%) and mirceno (2,1%) foram identificados como os constituintes majoritários. CR-EO mostrou alta atividade contra as formas promastigota de Leishmania amazonensis (CI50 = 8,23 µg/mL). CR-EO também exibiu alta atividade larvicida contra as larvas do terceiro estágio do Aedes aegypti com concentração letal (CL50 = 58,35 µg/mL) e mortalidade de 100% em 150 µg/mL. Este estudo sugere, pela primeira vez, o uso potencial de CR-EO contra esta importante doença viral transmitida por mosquitos do gênero Aedes.

2.
Braz. j. biol ; 81(3): 728-736, July-Sept. 2021. tab, graf
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1153401

RESUMO

Abstract Xylella fastidiosa is a plant-pathogenic bacterium that lives inside host xylem vessels, where it forms biofilm which is believed to be responsible for disrupting the passage of water and nutrients. Pectobacterium carotovorum is a Gram-negative plant-specific bacterium that causes not only soft rot in various plant hosts, but also blackleg in potato by plant cell wall degradation. Chagas disease, which is caused by Trypanosoma cruzi, has been commonly treated with nifurtimox and benzonidazole, two drugs that cause several side effects. As a result, the use of natural products for treating bacterial and neglected diseases has increased in recent years and plants have become a promising alternative to developing new medicines. Therefore, this study aimed to determine, for the first time, the chemical composition of essential oil from Psidium guajava flowers (PG-EO) and to evaluate its in vitro anti-Xylella fastidiosa, anti-Pectobacterium carotovorum, anti-Trypanosoma cruzi and cytotoxic activities. PG-EO was obtained by hydrodistillation in a Clevenger apparatus while its chemical composition was determined by gas chromatography-flame ionization detection (GC-FID) and gas chromatography-mass spectrometry (GC-MS). Major compounds identified in PG-EO were α-cadinol (37.8%), β-caryophyllene (12.2%), nerolidol (9.1%), α-selinene (8.8%), β-selinene (7.4%) and caryophyllene oxide (7.2%). Results showed that the PG-EO had strong trypanocidal activity against the trypomastigote forms of Trypanosoma cruzi (IC50 = 14.6 μg/mL), promising antibacterial activity against X. fastidiosa (MIC = 12.5 μg/mL) and P. carotovorum (MIC = 62.5 μg/mL), and moderate cytotoxicity against LLCMK2 adherent epithelial cells in the concentration range (CC50 = 250.5 μg/mL). In short, the PG-EO can be considered a new source of bioactive compounds for the development of pesticides and trypanocide drugs.


Resumo Xylella fastidiosa é uma bactéria patogênica que vive dentro dos vasos do xilema hospedeiro, onde forma um biofilme responsável por interromper a passagem de água e nutrientes. Pectobacterium carotovorum é uma bactéria Gram-negativa que causa não só podridão macia em várias plantas hospedeiras, mas também canela-preta na batata por degradação da parede celular da planta. A doença de Chagas, causada pelo Trypanosoma cruzi, é comumente tratada com nifurtimox e benzonidazol, duas drogas que causam vários efeitos colaterais. Como resultado, o uso de produtos naturais para o tratamento de doenças bacterianas e negligenciadas aumentou nos últimos anos e as plantas continuam sendo uma alternativa promissora para o desenvolvimento de novos medicamentos. Portanto, este estudo teve como objetivo determinar, pela primeira vez, a composição química do óleo essencial de flores de Psidium guajava (PG-EO) e avaliar suas propriedades anti-Xylella fastidiosa, anti-Pectobacterium carotovorum, anti-Trypanosoma cruzi e citotóxica in vitro. PG-EO foi obtido por hidrodestilação em um aparelho Clevenger, enquanto sua composição química foi determinada por cromatografia em fase gasosa com detecção por ionização por chama (CG-DIC) e por cromatografia em fase gasosa acoplada à espectrometria de massa (CG-EM). Os principais compostos identificados no PG-EO foram α-cadinol (37,8%), β-cariofileno (12,2%), nerolidol (9,1%), α-selineno (8,8%), β-selineno (7,4%) e óxido de cariofileno (7,2%). Os resultados mostraram que o PG-EO apresentou forte atividade tripanocida contra as formas tripomastigotas de T. cruzi (CI50 = 14,6 μg/mL), promissora atividade antibacteriana contra X. fastidiosa (MIC = 12,5 μg/mL) e P. carotovorum (MIC = 62,5 μg/mL) e citotoxicidade moderada contra células epiteliais aderentes (LLCMK2) na faixa de concentração (CC50 = 250,5 μg/mL). Em suma, o PG-EO pode ser considerado uma nova fonte de compostos bioativos para o desenvolvimento de pesticidas e drogas tripanocidas.

3.
Braz J Biol ; 83: e247539, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34190766

RESUMO

Numerous studies have investigated the chemical composition and biological activities of essential oils from different Citrus species fruit peel, leaves and flowers. This paper aims to investigate the chemical composition, larvicidal and antileishmanial activities of essential oil from Citrus reticulata fruit peel (CR-EO). CR-EO was obtained by hydrodistillation in a Clevenger-type apparatus and its chemical composition was analyzed by GC-MS and GC-FID. Limonene (85.7%), É£-terpinene (6.7%) and myrcene (2.1%) were identified as its major components. CR-EO showed high activity against promastigote forms of Leishmania amazonensis (IC50 = 8.23 µg/mL). CR-EO also exhibited high larvicidal activity against third instar Aedes aegypti larvae at a lethal concentration (LC50 = 58.35 µg/mL) and 100% mortality at 150 µg/mL. This study suggests, for the first time, the potential use of CR-EO against this important mosquito-borne viral disease caused by the genus Aedes.


Assuntos
Aedes , Citrus , Inseticidas , Óleos Voláteis , Animais , Frutas , Inseticidas/farmacologia , Larva , Óleos Voláteis/farmacologia
4.
Braz J Biol ; 81(3): 728-736, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-32876175

RESUMO

Xylella fastidiosa is a plant-pathogenic bacterium that lives inside host xylem vessels, where it forms biofilm which is believed to be responsible for disrupting the passage of water and nutrients. Pectobacterium carotovorum is a Gram-negative plant-specific bacterium that causes not only soft rot in various plant hosts, but also blackleg in potato by plant cell wall degradation. Chagas disease, which is caused by Trypanosoma cruzi, has been commonly treated with nifurtimox and benzonidazole, two drugs that cause several side effects. As a result, the use of natural products for treating bacterial and neglected diseases has increased in recent years and plants have become a promising alternative to developing new medicines. Therefore, this study aimed to determine, for the first time, the chemical composition of essential oil from Psidium guajava flowers (PG-EO) and to evaluate its in vitro anti-Xylella fastidiosa, anti-Pectobacterium carotovorum, anti-Trypanosoma cruzi and cytotoxic activities. PG-EO was obtained by hydrodistillation in a Clevenger apparatus while its chemical composition was determined by gas chromatography-flame ionization detection (GC-FID) and gas chromatography-mass spectrometry (GC-MS). Major compounds identified in PG-EO were α-cadinol (37.8%), ß-caryophyllene (12.2%), nerolidol (9.1%), α-selinene (8.8%), ß-selinene (7.4%) and caryophyllene oxide (7.2%). Results showed that the PG-EO had strong trypanocidal activity against the trypomastigote forms of Trypanosoma cruzi (IC50 = 14.6 µg/mL), promising antibacterial activity against X. fastidiosa (MIC = 12.5 µg/mL) and P. carotovorum (MIC = 62.5 µg/mL), and moderate cytotoxicity against LLCMK2 adherent epithelial cells in the concentration range (CC50 = 250.5 µg/mL). In short, the PG-EO can be considered a new source of bioactive compounds for the development of pesticides and trypanocide drugs.


Assuntos
Myrtaceae , Óleos Voláteis , Psidium , Flores , Testes de Sensibilidade Microbiana , Óleos Voláteis/farmacologia , Folhas de Planta , Xylella
5.
Arq. bras. med. vet. zootec. (Online) ; 72(1): 136-144, Jan.-Feb. 2020. tab, graf
Artigo em Inglês | LILACS, VETINDEX | ID: biblio-1088918

RESUMO

This study evaluated the effect of detoxified castor meal on the reproductive performance, metabolic stress, milk production, and kid development in peripartum goats. The diet of the animals were with (DCM, n= 20) or without (WDCM, n= 21) detoxified castor meal during the entire gestation and until weaning, 60 days post-birth. No differences were observed in the gestation period, litter size, rate of multiple births, and mortality between the two groups. The postpartum plasma concentrations of progesterone remained below 1ng/mL in all animals, thus, confirming the absence of active corpora lutea. The thickness of sternum adipose tissue and loin area, levels of urea and cholesterol, milk production, and daily weight gain in the kids were low in the DCM group when compared to those in the WDCM group (P< 0.05). To conclude, the use of detoxified castor meal in peripartum goats resulted in lower level of performance in the kids because of reductions in the amount of milk received from their mothers during lactation. In addition, the diet containing detoxified castor meals was not efficient in recovering from the loss of stored body reserves able to initiate the recovery of the cyclic activity of the goats.(AU)


Este estudo avaliou o efeito da torta de mamona desintoxicada na reprodução, no estresse metabólico, na produção de leite e no desenvolvimento de cabritos no periparto de cabras. Um grupo foi alimentado com torta de mamona (DCM, n=20), e o outro (WDCM, n=21) não recebeu tal suplemento , durante a gestação até o desmame, 60 dias pós-parto. Não foram observadas diferenças significativas no período de gestação, no número de cabritos, na taxa de partos múltiplos e na mortalidade entre os dois grupos. Em todos os animais, a concentração plasmática de progesterona ficou abaixo de 1ng/mL, confirmando a ausência de atividade lútea. A espessura da gordura subcutânea do esterno e da área de olho-de-lombo, a concentração de ureia e colesterol, a produção de leite e o ganho de peso dos cabritos foram menores no grupo DCM (P<0,05). Conclui-se que o uso de torta de mamona desintoxicada no periparto de cabra resultou em cabritos mais leves devido à redução na produção de leite das matrizes e as cabras não retornaram ao cio, pois não recuperaram a massa corporal.(AU)


Assuntos
Animais , Feminino , Ricinus , Estresse Fisiológico , Lactação , Cabras/fisiologia , Animais Recém-Nascidos/crescimento & desenvolvimento , Nitrogênio/administração & dosagem , Progesterona , Suplementos Nutricionais
6.
Anim Reprod Sci ; 188: 1-12, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29233618

RESUMO

Changes in the nutritional plan have been shown to affect oocyte quality, crucial to oocyte donors animals used in cloning. This study aimed to evaluate the impact of diets with increasing nutritional levels (maintenance diet=M; 1.3M; 1.6M; 1.9M) fed to goats for four weeks on follicular fluid composition, gene expression and oocyte competence used to cloning in goats. Donor females were superovulated for the retrieval of matured oocytes and physical measurements reported. After four weeks, groups receiving diets above maintenance increased thickness of subcutaneous adipose tissue and body weight, with higher values in 1.9M Group (P<0.05). Treatments did not affect follicular density, number of aspirated follicles, retrieved and matured oocytes. Animals from 1.3M group had lower (P<0.05) maturation rate (44.0%) and number of viable oocytes (65.3%) than M (68.8%) and 1.9M (76.0%). Follicular fluid glucose concentrations increased with nutritional levels (P=0.010), with a difference (P<0.05) between groups 1.9M (11.4±2.6mg/dL) and M (2.6±0.5mg/dL). The diet did not affect the expression of GDF9, BMP15, and BAX genes in oocytes, but BCL2 and apoptotic index were significantly higher (P<0.05) in the 1.3M and 1.6M groups than the other groups. Following the transfer of cloned embryos, one fetus was born live of a twin pregnancy in the 1.9M Group. The association between energy intake and oocyte quality suggests better nutritional use by oocytes when the maximum flow was used (1.9M), but the optimal feeding level in cloning still needs refinement.


Assuntos
Ração Animal/análise , Fenômenos Fisiológicos da Nutrição Animal , Dieta/veterinária , Desenvolvimento Embrionário/fisiologia , Cabras/embriologia , Animais , Clonagem de Organismos , Transferência Embrionária/veterinária , Ingestão de Energia , Feminino , Fertilização In Vitro/veterinária , Líquido Folicular/química , Regulação da Expressão Gênica/fisiologia , Cabras/metabolismo , Técnicas de Maturação in Vitro de Oócitos/veterinária , Técnicas de Transferência Nuclear/veterinária , Recuperação de Oócitos , Gravidez , Superovulação
7.
Reprod Toxicol ; 53: 152-61, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25883025

RESUMO

The present study was conducted to evaluate the effect of de-oiled castor cake on reproductive traits of crossbreed goats. Fourteen males were grouped into two lots (n = 7/group), as described: group without de-oiled castor cake (WCC) and group fed with de-oiled castor cake (CC). Goats received two diets containing a mixture of Bermudagrass hay and concentrates with the same energy (73% total digestive nutrients) and protein content (15% crude protein) during 150 days, corresponding to ages from 40 (puberty) to 60 weeks. Blood plasma concentrations of urea, albumin, lactate dehydrogenase, creatinine, alanine aminotransferase and testosterone were determined. We also evaluated scrotal circumference, sperm parameters, quantitative aspects of spermatogenesis and daily sperm production (DSP), as well as the proteome of seminal plasma and sperm membrane. Seminal fluid and sperm proteins were analyzed by 2D SDS-PAGE and mass spectrometry. After 150 days of castor cake feeding, animals had no changes in the biochemical composition of blood plasma, suggesting the absence of intoxication by ingestion of ricin. There were no alterations in dry mater intake, weight gain, testis size, peripheral concentrations of testosterone, sperm concentration, motility and morphology. Sertoli and germ cell populations in the testis and DSP were not affected either. However, there were significant variations in the expression of five seminal plasma proteins and four sperm membrane proteins. In conclusion, the replacement of soybean meal by castor cake (with ricin concentrations of 50mg/kg) did not interfere with the growth and core reproductive development of male goats. However, the diet with ricin altered the expression of certain seminal plasma and sperm membrane proteins, which play roles in sperm function and fertilization. Lower expression of these proteins may impair the ricin-fed animals to perform as high-fertility sires.


Assuntos
Ricina/toxicidade , Sêmen/efeitos dos fármacos , Espermatozoides/efeitos dos fármacos , Animais , Cabras , Masculino , Proteínas de Membrana/metabolismo , Sêmen/metabolismo , Maturidade Sexual/efeitos dos fármacos , Espermatogênese/efeitos dos fármacos , Espermatozoides/metabolismo , Testículo/citologia , Testículo/efeitos dos fármacos , Testosterona/sangue
8.
Meat Sci ; 106: 16-24, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-25866931

RESUMO

Diet can influence both the qualitative and quantitative traits of ruminant meat. This study evaluated the effects of castor de-oiled cake on the meat of mixed-breed male goat kids. After 165days of diet treatment, no alterations (p>0.05) were observed in the in vivo performance, anatomic components, dissection and proximate composition of the Longissimus dorsi muscle, as well as in the color and pH of the carcasses. However, diet had an effect (p<0.05) on energy metabolites, fatty acid profile, and expression of certain proteins of the Longissimus dorsi muscle. To conclude, this study showed that the establishment of castor de-oiled cake diet for a long period to goats led to alterations in meat quality, without compromising its consumption qualities.


Assuntos
Semente de Rícino/química , Dieta/veterinária , Qualidade dos Alimentos , Cabras/crescimento & desenvolvimento , Carne/análise , Desenvolvimento Muscular , Músculo Esquelético/crescimento & desenvolvimento , Agricultura/economia , Ração Animal/análise , Ração Animal/economia , Animais , Biocombustíveis/economia , Semente de Rícino/efeitos adversos , Produtos Agrícolas/efeitos adversos , Produtos Agrícolas/química , Dieta/efeitos adversos , Dieta/economia , Proteínas na Dieta/análise , Proteínas na Dieta/metabolismo , Ácidos Graxos/análise , Ácidos Graxos/metabolismo , Humanos , Resíduos Industriais/efeitos adversos , Resíduos Industriais/análise , Resíduos Industriais/economia , Masculino , Músculo Esquelético/metabolismo , Valor Nutritivo , Venenos/análise , Venenos/toxicidade , Ricina/análise , Ricina/toxicidade , Sementes/efeitos adversos , Sementes/química
9.
Arq. bras. med. vet. zootec ; 66(4): 1171-1178, 08/2014. tab, graf
Artigo em Português | LILACS | ID: lil-722572

RESUMO

A expressão de RNAm para leptina, receptor de leptina (obRb), adiponectina, receptor de adiponectina (AdipoR1) e resistina foi avaliada por meio da técnica de PCR em tempo real, em tecidos ovariano, hipofisário, adiposo do omento e da região perirrenal, em ovelhas alimentadas sem farelo de mamona ou com farelo de mamona detoxificada durante 14 meses. O tipo de dieta não afetou os níveis de RNAm para leptina, obRb, adiponectina, AdipoR1 e resistina nos diferentes tecidos avaliados (P>0,05). Nos tecidos ovariano e hipofisário, não foi verificada a expressão da adiponecina e da resistina, respectivamente. Como consequência, pode-se concluir que o farelo de mamona detoxificada pode ser utilizado como fonte proteica na dieta de ovelhas, sem afetar a expressão do gene resistina e dos genes leptina e adiponectina, bem como de seus receptores...


The expression of leptin, leptin receptor (obRb), adiponectin, adiponectin receptor (AdipoR1) and resistin was assessed by real-time PCR technique in ovarian, pituitary, and the omental adipose perirenal tissue in sheep feed without castor meal or with detoxified castor meal. The type of diet did not affect mRNA levels for leptin, obRb, adiponectin, resistin AdipoR1 evaluated in different tissues (P>0.05). However, in pituitary and ovarian tissues there was no expression of resistin and adiponectin, respectively. The detoxified castor meal can be used in sheep diets as alternative food protein without affecting the expression of leptin and adponectin as well as their receptors and resistin...


Assuntos
Animais , Ovinos/metabolismo , Receptores de Adipocina/análise , Receptores para Leptina/análise , Reprodução/fisiologia , Resistina/análise , Ração Animal , Ricinus , Reação em Cadeia da Polimerase/veterinária
10.
Anim Reprod Sci ; 148(1-2): 32-41, 2014 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-24927666

RESUMO

The aim of this study was to determine whether the consumption of detoxified castor meal (DCM) by goats over a long period of time affects mRNA levels in oocytes, and in mural granulosa and cumulus cells. A total of 41 adult does were supplemented (DCM group, n=21) or not (control group, n=20) with detoxified castor meal (DCM) for a period of 500 days. Then, 13 and 12 does were randomly selected for slaughter from the DCM and control treatments groups, respectively, for the determination of the number of visible ovarian follicles, retrieved cumulus-oocyte complexes (COCs), and viable and non-viable oocytes. The relative expression levels for distinct genes were determined by quantitative PCR in viable immature oocytes prior to in vitro maturation (IVM), in oocytes attaining or not the metaphase stage after IVM, as well as in granulosa cells obtained upon oocyte collection, and in cumulus cells obtained after IVM. The number of follicles ≥4 mm did not differ between treatments (overall mean 23.3 ± 2.0) and no significant differences were observed in the recovery of viable, non-viable, or total mean numbers of oocytes (control group: 44.7 ± 4.6, DCM group: 54.9 ± 5.9, respectively) between control and DCM fed goats. The maturation rate was significantly higher for control than DCM oocytes (58.0% vs. 45.3%; P<0.05). The mRNA levels in immature COC for controls were significantly higher for GLUT1 and lower for HSP70 (P<0.05) than for DCM. Following maturation, MII oocytes from both treatments had mRNA levels that were significantly higher for GDF9 and lower for BMP15 than for NC oocytes (P<0.05). In cumulus cells, the mRNA levels were significantly higher for LHR, FSHR, LeptinR, and IGF1, and lower for MnSOD in the control group compared with the DCM group (P<0.05). In conclusion, the inclusion of DCM in goat feed for long periods of time changed gene expression in immature oocytes and in cumulus cells. This was reflected by a decrease in the in vitro oocyte maturation rate.


Assuntos
Ração Animal/análise , Semente de Rícino/química , Dieta/veterinária , Regulação da Expressão Gênica/efeitos dos fármacos , Cabras/fisiologia , Oócitos/crescimento & desenvolvimento , Fenômenos Fisiológicos da Nutrição Animal , Animais , Biocombustíveis , Feminino , Células da Granulosa/efeitos dos fármacos , Células da Granulosa/fisiologia , Resíduos Industriais
11.
Theriogenology ; 82(2): 332-7, 2014 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-24853280

RESUMO

Lipid-rich and energy-dense diets can have significant effects on the reproductive physiology, including the ovarian function and fertility. The aim of this study was to assess the effect of cashew nut bran supplementation as a lipid source on follicle development, plasma and intrafollicular concentrations of cholesterol, and developmental competence of in vitro-matured goat oocytes. The inclusion of cashew nut bran as 24% of the goats' diet for 28 days increased the percentage and number of degenerated oocytes compared with the control (P < 0.05), and also the plasma cholesterol levels and the proportion of grade IV oocytes compared with all other treatments (P < 0.05). Moreover, a significant reduction was observed in the proportion of viable oocytes compared with the control and in the percentage of grade II oocytes compared with all other treatments (P < 0.05). Oocyte maturation, cleavage, and blastocyst rates after parthenogenetic activation of viable oocytes were not affected by the type of diet. In conclusion, the inclusion of cashew nut bran as 24% of the diet of adult goats for 28 days changed plasma cholesterol levels and reduced the proportion of viable immature oocytes; however, the 12% and 24% diet supplementations with cashew nut bran did not interfere with competence of resulting viable oocytes to reach the metaphase II stage after IVM, and to develop after parthenogenetic activation.


Assuntos
Anacardium , Cabras/fisiologia , Metabolismo dos Lipídeos , Oócitos/citologia , Ração Animal , Animais , Colesterol/sangue , Feminino , Cabras/metabolismo , Técnicas de Maturação in Vitro de Oócitos , Reprodução
12.
Neuropsychopharmacology ; 33(9): 2237-50, 2008 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-17987062

RESUMO

The immunological response in the brain is crucial to overcome neuropathological events. Some inflammatory mediators, such as the immunoregulatory cytokine interleukin-6 (IL-6) affect neuromodulation and may also play protective roles against various noxious conditions. However, the fundamental mechanisms underlying the long-term effects of IL-6 in the brain remain unclear. We now report that IL-6 increases the expression and function of the neuronal adenosine A1 receptor, with relevant consequences to synaptic transmission and neuroprotection. IL-6-induced amplification of A1 receptor function enhances the responses to readily released adenosine during hypoxia, enables neuronal rescue from glutamate-induced death, and protects animals from chemically induced convulsing seizures. Taken together, these results suggest that IL-6 minimizes the consequences of excitotoxic episodes on brain function through the enhancement of endogenous adenosinergic signaling.


Assuntos
Interleucina-6/farmacologia , Neurônios/efeitos dos fármacos , Receptor A1 de Adenosina/metabolismo , Transmissão Sináptica/efeitos dos fármacos , Regulação para Cima/efeitos dos fármacos , Análise de Variância , Animais , Autorradiografia/métodos , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Córtex Cerebral/citologia , Embrião de Mamíferos , Inibidores Enzimáticos/farmacologia , Fármacos Atuantes sobre Aminoácidos Excitatórios/farmacologia , Potenciais Pós-Sinápticos Excitadores/efeitos dos fármacos , Potenciais Pós-Sinápticos Excitadores/efeitos da radiação , Hipocampo/efeitos dos fármacos , Hipocampo/fisiologia , Interleucina-6/deficiência , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Pentilenotetrazol/farmacologia , Ensaio Radioligante/métodos , Receptor A1 de Adenosina/genética , Convulsões/induzido quimicamente , Convulsões/tratamento farmacológico , Convulsões/genética , Fatores de Tempo
13.
J Appl Microbiol ; 103(1): 141-51, 2007 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-17584460

RESUMO

AIMS: To evaluate archaeal diversity in natural and impacted habitats from Rio de Janeiro state, Brazil, a tropical region of South America. METHODS AND RESULTS: 16S rRNA gene was amplified directly by polymerase chain reaction (PCR) from genomic DNA, extracted from Guanabara Bay (GB) water, halomarine sediment (HS), municipal landfill leachate, agricultural soil and wastewater treatment (WT) system. Five archaeal 16S rDNA clone libraries were constructed. A total of 123 clones, within the five libraries analysed, were clustered into 29 operational taxonomic units, related to cultivated (24%) and uncultivated (76%) organisms. Rarefaction analysis showed that the libraries contained different levels of diversity. PCR-denaturing gradient gel electrophoresis (DGGE) of 16S-23S intergenic spacer regions confirmed the presence of a dominant phylotype, revealed by the WT system clone library. CONCLUSIONS: Archaeal communities of impacted environments seem to be confined to specific ecosystems with similar physicochemical properties, while communities from natural environments appear to be widely distributed. The presence of a high number of phylotypes related to uncultivated organisms suggests new archaeal lineages. SIGNIFICANCE AND IMPACT OF THE STUDY: This study reports, for the first time, the analysis of archaeal diversity in tropical environments from Brazil, and adds sequences from this region to the developing database of 16S rRNA clone libraries from environmental samples.


Assuntos
Archaea/classificação , Clima Tropical , Archaea/genética , Archaea/isolamento & purificação , Biodiversidade , Brasil , DNA Arqueal/genética , Ecossistema , Eletroforese em Gel de Poliacrilamida/métodos , Biblioteca Gênica , Filogenia , Reação em Cadeia da Polimerase/métodos , RNA Ribossômico 16S/genética , Microbiologia do Solo , Resíduos , Microbiologia da Água
14.
S Afr Med J ; 68(4): 265-7, 1985 Aug 17.
Artigo em Inglês | MEDLINE | ID: mdl-4035487

RESUMO

Hamartomas in the head and neck region are unusual, and few reports of such lesions are found in the literature. Four cases of hamartoma are described. Two were lymphoid hamartomas (1 occurred in the neck and 1 in the parotid gland), the third was a vascular hamartoma of the ethmoid, and the fourth was found in the neck and was composed of cartilage and fibrofatty tissue.


Assuntos
Hamartoma/patologia , Neoplasias de Cabeça e Pescoço/patologia , Adolescente , Adulto , Pré-Escolar , Feminino , Hamartoma/cirurgia , Neoplasias de Cabeça e Pescoço/cirurgia , Humanos , Masculino
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...