RESUMO
Propolis samples collected from five areas in Mato Grosso do Sul state, Midwest Brazil, comprising portions of the Cerrado, Pantanal, and Atlantic Forest ecosystems, were investigated for metabolomic profiles and evaluated for antioxidant and antitumor potential. Chemical profiles were determined by HPLC-DAD-MS/MS data and evaluated using principal component analysis and hierarchical clustering analysis to discern chemical composition patterns. Based on phytogeographical origin and chemical composition, 20 potential markers were identified and five groups were distinguished: (I) Cerrado/Central, (II) Atlantic Forest/South, (III) Cerrado-Pantanal transition area/Northwest, (IV) Cerrado/North, and (V) Pantanal/West. Drawing on HPLC-DAD-MS/MS and NMR data, 47 compounds were successfully or tentatively identified, including prenylated phenylpropanoids, flavonoids, isoflavonoids, and di- and triterpenoids, among other constituents. Isoflavonoids, typically found in red propolis from Northeast Brazil, are being reported for the first time in a propolis sample from the Midwest. A new prenylated aromatic compound, (E)-3-[4-hydroxy-3-(2-hydroxy-3-methylbut-3-en-1-yl)-5-(3-methylbut-2-en-1-yl)phenyl]propenoic acid, was obtained. Samples in group II exhibited promising antitumor potential against prostate and breast carcinoma cells, as did samples in groups III and IV against the latter cell line. The sample in group I, despite containing the highest amount of total phenolic compounds and being the only sample to exhibit scavenging activity against DPPH, was not the most cytotoxic against the cell lines tested.
Assuntos
Antioxidantes/química , Flavonoides/química , Brasil , Cromatografia Líquida de Alta Pressão , Ecossistema , Flavonoides/metabolismo , Metabolômica , Estrutura Molecular , Fenóis/química , Própole/química , Espectrometria de Massas em TandemRESUMO
Majoranolide, a butanolide isolated from the nonpolar fraction of an ethanol extract of Mezilaurus crassiramea (Lauraceae) fruits, is being reported for the first time in this genus and the third time in plants. Structurally identified from 1D and 2D NMR and HRESIMS data, majoranolide proved cytotoxic against cancer cells-MCF-7 and MDA-MB-231 (breast), HT-29 (colon), PC-3 (prostate), 786-0 (renal), and HL-60 (leukemia)-inhibiting growth in HL-60 cells (GI50 = 0.21 µM) and exhibiting higher selectivity for this line than for nonneoplastic NIH/3T3 murine fibroblasts. Effects on the cell cycle, caspase-3 activation, and plasma membrane integrity were evaluated by flow cytometry. Expression of genes related to apoptotic pathways (BAX, BCL2, BIRC5, and CASP8) was investigated using RT-qPCR. At 50 µM, majoranolide induced cell cycle arrest at G1 in 24 h increased the sub-G1 population in 48 h and increased caspase-3 activation in a time-dependent manner. The compound upregulated BAX and CASP8 transcription (proapoptotic genes) and downregulated BIRC5 (antiapoptotic). Loss of plasma membrane integrity in 30% of cells occurred at 48 h, but not at 24 h, characterizing gradual, programmed death. The results suggest that majoranolide cytotoxicity involves apoptosis induction in HL-60 cells, although other mechanisms may contribute to this cell death.
RESUMO
Two Rubiaceae-type cyclopeptides, 6-O-methylbouvardin (1) and the new cyclopeptide 5ß-hydroxy-RA-III (2), were isolated from the roots of Galianthe thalictroides. Employing the sulforhodamine B assay, compounds 1 and 2 were tested in vitro against three cancer cell lines--786-0 (kidney carcinoma), PC-3 (prostate carcinoma), and HT-29 (colon carcinoma)--and showed GI50 values ranging from 0.06 to 1.80 µg mL(-1). This is the first report on the isolation of Rubiaceae-type cyclopeptides from a genus other than Rubia or Bouvardia.
Assuntos
Antineoplásicos Fitogênicos/isolamento & purificação , Antineoplásicos Fitogênicos/farmacologia , Peptídeos Cíclicos/isolamento & purificação , Rubiaceae/química , Antineoplásicos Fitogênicos/química , Brasil , Sobrevivência Celular/efeitos dos fármacos , Ensaios de Seleção de Medicamentos Antitumorais , Células HT29 , Humanos , Masculino , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Peptídeos Cíclicos/química , Extratos Vegetais/química , Raízes de Plantas/químicaRESUMO
Abstract Piper angustifolium Lam., Piperaceae, popularly known as "matito", "pimenta-de-macaco", "pimenta-longa" or "jagurandi" in Brazil, has been commonly used in the treatment of cutaneous leishmaniasis-associated lesions, but there are few studies on the activity against visceral leishmaniasis-associated species. This study demonstrates the first in vitro antileishmanial activity of the P. angustifolium essential oil, of which the phytochemical profile showed the presence of sesquiterpenes and monoterpenes. The main compounds were spathulenol (23.8%) and caryophyllene oxide (13.1%). P. angustifolium essential oil was highly active [the half maximum inhibitory concentration = 1.43 μg/ml] against intracellular amastigotes of Leishmania infantum, the etiological agent of visceral leishmaniasis in the New and Old World. Activity was obtained 24 h after addition of the oil (6.25–50 μg/ml), with a reduction of 100% in the infection index at concentrations of 25 and 50 μg/ml. P. angustifolium essential oil showed low cytotoxicity for mammalian fibroblasts and macrophages (the half maximum inhibitory concentration values of 31.67 and 48.22 μg/ml, respectively), and it was 33 and 22 times more toxic to amastigotes than to mammalian cells, as indicated by selectivity indexes. The results demonstrated that P. angustifolium essential oil is a promising alternative for the study of potential drugs for visceral leishmaniasis.
RESUMO
A cytotoxicity-guided fractionation of the roots of Galianthe thalictroides afforded a new ß-carboline alkaloid, 1-(hydroxymethyl)-3-(2-hydroxypropan-2-yl)-2-(5-methoxy-9H- ß-carbolin-1-yl)cyclopentanol, which exhibited strong cytotoxic activity against three human cancer cell lines (MCF-7, 786-0, and UACC62). Its structure was established on the basis of 1D- and 2D-NMR spectroscopic techniques supported by HRMS data.
Assuntos
Alcaloides/isolamento & purificação , Antineoplásicos Fitogênicos/isolamento & purificação , Carbolinas/isolamento & purificação , Extratos Vegetais/isolamento & purificação , Rubiaceae/química , Alcaloides/química , Alcaloides/farmacologia , Antineoplásicos Fitogênicos/química , Antineoplásicos Fitogênicos/farmacologia , Brasil , Carbolinas/química , Carbolinas/farmacologia , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , Ciclopentanos , Relação Dose-Resposta a Droga , Ensaios de Seleção de Medicamentos Antitumorais , Feminino , Humanos , Concentração Inibidora 50 , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Raízes de Plantas/química , Plantas MedicinaisRESUMO
Neospora caninum is an obligate intracellular parasite that can infect domestic and wild canids, as well as ruminants and equines. It was described in 1988 and has been known as a major cause of abortion in bovines and neuromuscular alterations and death in dogs. To estimate the prevalence of bovine neosporosis in the 22 municipalities of the so-called Estrato 1 subregion of the Brazilian state of Mato Grosso do Sul, blood samples were collected from cows aged 24 months and older, from December 2003 to March 2004. During sample collection, a questionnaire was used to gather data of epidemiological interest. The samples were subjected to serological diagnosis (indirect fluorescence antibody test - IFAT). Prevalences of 14.9% (449/2488) and 69.8% (143/205) were found for the animals and herds sampled, respectively. The variable found to be associated with seropositivity to N. caninum was abortion (OR 2.52; CI 1.25-5.06). The results revealed the presence of infection by N. caninum in the herds investigated, drawing attention to its role as a potential cause of abortion in cattle in Mato Grosso do Sul.
Assuntos
Anticorpos Antiprotozoários/sangue , Bovinos/sangue , Bovinos/parasitologia , Neospora/imunologia , Animais , BrasilRESUMO
Neospora caninum is an obligate intracellular parasite that can infect domestic and wild canids, as well as ruminants and equines. It was described in 1988 and has been known as a major cause of abortion in bovines and neuromuscular alterations and death in dogs. To estimate the prevalence of bovine neosporosis in the 22 municipalities of the so-called Estrato 1 subregion of the Brazilian state of Mato Grosso do Sul, blood samples were collected from cows aged 24 months and older, from December 2003 to March 2004. During sample collection, a questionnaire was used to gather data of epidemiological interest. The samples were subjected to serological diagnosis (indirect fluorescence antibody test - IFAT). Prevalences of 14.9 percent (449/2488) and 69.8 percent (143/205) were found for the animals and herds sampled, respectively. The variable found to be associated with seropositivity to N. caninum was abortion (OR 2.52; CI 1.25-5.06). The results revealed the presence of infection by N. caninum in the herds investigated, drawing attention to its role as a potential cause of abortion in cattle in Mato Grosso do Sul.
Neospora caninum é um parasita intracelular obrigatório que pode infectar canídeos domésticos e selvagens, ruminantes e eqüídeos. Esse parasita foi descrito em 1988 e, desde sua descoberta, tem emergido como uma das principais causas de aborto em bovinos, além de causar alterações neuromusculares e morte em cães. Para estimar a prevalência da neosporose bovina em 22 municípios que compõem a sub-região denominada Estrato 1 do estado de Mato Grosso do Sul, foram analisados soros obtidos no período de dezembro de 2003 a março de 2004 de fêmeas com idade igual ou superior a 24 meses. Durante a colheita das amostras foi preenchido um questionário com informações de interesse epidemiológico. A determinação da presença de anticorpos anti-N. caninum foi feita pela Reação de Imunofluorescência Indireta, sendo as prevalências encontradas nos animais e nos rebanhos amostrados de 14,9 por cento (449/2488) e 69,8 por cento (143/205), respectivamente. A variável que apresentou associação de soropositividade com N. caninum foi o aborto (OR 2,52; IC 1,25-5,06). Os resultados indicam que a infecção por N. caninum está presente nos rebanhos e que deveria ser considerada como uma potencial causa de aborto em Mato Grosso do Sul.
Assuntos
Animais , Anticorpos Antiprotozoários/sangue , Bovinos/sangue , Bovinos/parasitologia , Neospora/imunologia , BrasilRESUMO
Neospora caninum is an obligate intracellular protozoan that can infect domestic and wild canids, as well as ruminants and equines. It was described in 1988 as causing neuromuscular alterations and death in dogs. Recently, N. caninum has been the focus of considerable attention for its large impact on the dairy industry, given the economic losses related to breeding failures and to a decrease in productivity. ELISA diagnosis of neosporosis has not been widely used in Brazil, mostly because of the assay's cost, and thus the distribution of the disease in the country is not well known. In order to evaluate its ability to react with sera from infected animals from the state of Mato Grosso do Sul, an antigenic determinant domain of a major surface protein (Nc-p43) was produced. The antigenic domain, located in the distal 2/3 region of the C-terminus, was amplified by polymerase chain reaction. The DNA fragments were cloned into pet100/D-TOPO vectors. The recombinant plasmids were transformed into Escherichia coli of the BL21 Star (DE3) strain and induced to express the fused fragment of Nc-p43 as a 29-kDa protein that, when assayed with bovine Neospora-positive serum from a regional sample, was sensitive for identification by immunoblotting. This Nc-p43 fragment may be of use in additional studies targeted at diagnosing N. caninum infection and at evaluating the immunoprotection conferred by the protein fragment to animal hosts.
Assuntos
Antígenos de Superfície/biossíntese , Clonagem Molecular , Proteínas de Protozoários/biossíntese , Proteínas Recombinantes/biossíntese , Animais , Neospora/imunologiaRESUMO
FUNDAMENTOS: A aprotinina, um antifibrinolítico de natureza protéica, tem sido proposta pela literatura, no intuito de minimizar os efeitos adversos da circulação extracorpórea ao sistema fibrinolítico, permitindo assim uma hemostasia mais adequada. OBJETIVO: Estudar comparativamente o efeito da utilização profilática de baixas doses de aprotinina em pacientes submetidos à circulação extracorpórea. MÉTODO: Dezessete pacientes portadores de valvopatia mitral submetidos a correção cirúrgica utilizando-se circulação extracorpórea foram aleatoriamente divididos em dois grupos: I (controle) - 9 pacientes nos quais foi administrado placebo no perfusato e a cada hora de CEC; II (aprotinina) - 8 pacientes nos quais foram administrados 30000 KIU/kg e 7500 KIU/kg de aprotinina adicionados ao volume do perfusato a cada hora de CEC. O volume total de sangramento pós-operatório nas primeiras 24 horas foi monitorado, assim como amostras sangüíneas foram colhidas após indução anestésica e após a neutralização da heparina com sulfato de protamina para que os seguintes parâmetros fossem avaliados: atividade de protrombina (AP), tempo de tromboplastina parcial ativado (TTPA), tempo de trombina (TT), dosagem de fibrinogênio, concentração de antitrombina III (ATIII), tempo de lise da euglobulina (TLE) e dosagem do dímero -D (DDi). RESULTADOS: O volume médio total de sangramento nas primeiras 24 horas no grupo controle foi 690,67 ± 377,12, enquanto que no grupo da aprotinina em baixas doses foi de 248,75 ± 103,13 (p=0,0017). No quadro abaixo estão apresentados os resultados obtidos a partir das análises das amostras sangüíneas pré e pós-operatórias comparativas dos grupos controle (I) e aprotinina (II)