RESUMO
The skin secretion from toads of the Bufonidae family has great potential in the search for new active compounds to be used as drug candidates in treating some diseases, among them cancer. In this context, this study aimed to evaluate the cytotoxic and antimutagenic activity of the parotoid gland secretion extracts of Rhinella marina and Rhaebo guttatus, as well as biochemically analyze transaminases and serum creatinine for liver and renal damage, respectively. Cytotoxicity was performed by the colorimetric method based on MTT (3- [4, 5-dimethyl-2-thiazolyl]-2, 5-diphenyl-2H-tetrazolium bromide) with different concentrations of the extracts in Walker or splenic tumor cell cultures from rats and mice. The micronucleus test was performed with male Swiss mice treated orally with the extracts for 15 days, and then intraperitoneally with N-ethyl-N-nitrosurea (50 mg kg-1). Micronucleated polychromatic erythrocytes (MNPCE) were evaluated in bone marrow. The extracts showed cytotoxic activity in the evaluated cells. There was a significant reduction in the frequency of MNPCE (R. marina = 56% and R. guttatus = 75%, p < 0.001), indicating antimutagenic potential of the extracts. The groups treated only with extract showed an increase in MNPCE frequency, evidencing mutagenic potential. Biochemical analyzes showed no significant difference between treatments. Thus, under our experimental conditions, the extracts of R. marina and R. guttatus skin secretions presented chemopreventive potential for cancer. (AU)
A secreção cutânea de anuros da família Bufonidae tem grande potencial na busca de novos compostos ativos para utilização como fármacos candidatos no tratamento de algumas doenças, entre elas o câncer. Neste contexto, este estudo teve como objetivo avaliar a atividade citotóxica e antimutagênica dos extratos da secreção da glândula parótida de Rhinella marina e Rhaebo guttatus, bem como a análise bioquímica de transaminases e creatinina séricas, para avaliar dano hepático e renal, respectivamente. A avaliação de citotoxicidade foi realizada pelo método colorimétrico baseado no MTT (3-[4, 5-dimethyl-2-thiazolyl]-2, 5-diphenyl-2H-tetrazolium bromide), com diferentes concentrações dos extratos em culturas de células do Tumor de Walker ou células esplênicas de rato e camundongo. O teste do micronúcleo foi realizado com camundongos Swiss machos que receberam tratamento oral com os extratos durante 15 dias, seguido de tratamento intraperitoneal com N-etil-N-nitrosuréia (50 mg kg-1). A frequência de eritrócitos policromáticos micronucleados (PCEMN) foi determinada em medula óssea. Os extratos apresentaram ação citotóxica nas células avaliadas. Houve uma redução significativa na frequência de PCEMN (R. marina = 56% e R. guttatus = 75%, p < 0,001), observando-se um potencial antimutagênico dos extratos. Os grupos tratados somente com os extratos apresentaram um aumento na frequência de PCEMNs, evidenciando um potencial mutagênico. As análises bioquímicas não apresentaram diferença significativa entre os tratamentos. Assim, nas condições experimentais testadas, as secreções cutâneas de R. marina e R. guttatus apresentaram potencial quimiopreventivo para câncer.(AU)
Assuntos
Animais , Camundongos , Bufonidae/fisiologia , Antimutagênicos/análise , Citotoxinas/análise , Glândula Parótida/química , Quimioprevenção/veterinária , BioprospecçãoRESUMO
BACKGROUND: Camu-camu (Myrciaria dubia) is a typical Amazonian fruit and has high antioxidant capacity due to its high levels of vitamin C and phenolic compounds. This study aimed to determine the phytochemicals, antioxidant capacity and antimutagenic effects of camu-camu fruits with different maturity stages grown in dry (commercial cultivation) or flooded environments (native cultivation, Amazon). RESULTS: Total polyphenols, ascorbic acid and in vitro antioxidant capacity levels were higher in ripe fruits grown in a commercial cultivation. The extracts from ripe camu-camu grown in a commercial cultivation exerted antioxidant effects and high percentage of protection against doxorubicin and 1,2-dimethylhydrazine in all tested systems (liver, bone marrow and gut), for three camu-camu extract concentrations (17, 85 and 170 mg kg-1 body weight), as follows: bone marrow minocronucleus (37.91%, 41.75%, 43.95%); micronucleus gut test (61.01%, 64.40%, 50.28%); apoptosis index (60.26%, 62.44%, 58.22%); comet assay through the tail moment (71.64%, 72.31%, 70.70%), percent DNA in the tail (64.54%, 68.75%, 76.79%) and tail intensity (76.43%, 81.02%, 68.33%). CONCLUSION: The results of this study contribute to increasing the production of camu-camu fruits grown in dry environments and their use as a health-promoting food. © 2018 Society of Chemical Industry.
Assuntos
Antimutagênicos/farmacologia , Frutas/química , Myrtaceae/química , Extratos Vegetais/farmacologia , Animais , Antimutagênicos/análise , Antioxidantes/análise , Antioxidantes/farmacologia , Dano ao DNA/efeitos dos fármacos , Frutas/crescimento & desenvolvimento , Masculino , Camundongos , Myrtaceae/crescimento & desenvolvimento , Fenóis/análise , Fenóis/farmacologia , Extratos Vegetais/análiseRESUMO
In this work, we investigated the usefulness of the SOS Chromotest for screening plant antigenotoxic agents against ultraviolet radiation (UV). Fifty Colombian plant extracts obtained by supercritical fluid (CO2) extraction, twelve plant extract constituents (apigenin, carvacrol, ß-caryophyllene, 1,8-cineole, citral, p-cymene, geraniol, naringenin, pinocembrin, quercetin, squalene, and thymol) and five standard antioxidant and/or photoprotective agents (curcumin, epigallocatechin gallate, resveratrol, α-tocopherol, and Trolox®) were evaluated for their genotoxicity and antigenotoxicity against UV using the SOS Chromotest. None of the plant extracts, constituents or agents were genotoxic in the SOS Chromotest at tested concentrations. Based on the minimal extract concentration that significantly inhibited UV-genotoxicity (CIG), five plant extracts were antigenotoxic against UV as follows: Baccharis nítida (16 µg mL-1) = Solanum crotonifolium (16 µg mL-1) > Hyptis suaveolens (31 µg mL-1) = Persea caerulea (31 µg mL-1) > Lippia origanoides (62 µg mL-1). Based on CIG values, the flavonoid compounds showed the highest antigenotoxic potential as follows: apigenin (7 µM) > pinocembrin (15 µM) > quercetin (26 µM) > naringenin (38 µM) > epigallocatechin gallate (108 µM) > resveratrol (642 µM). UV-genotoxicity inhibition with epigallocatechin gallate, naringenin and resveratrol was related to its capability for inhibiting protein synthesis. A correlation analysis between compound antigenotoxicity estimates and antioxidant activity evaluated by the oxygen radical absorbance capacity (ORAC) assay showed that these activities were not related. The usefulness of the SOS Chromotest for bioprospecting of plant antigenotoxic agents against UV was discussed.
Assuntos
Antimutagênicos/farmacologia , Extratos Vegetais/química , Extratos Vegetais/farmacologia , Protetores contra Radiação/farmacologia , Raios Ultravioleta/efeitos adversos , Antimutagênicos/análise , Baccharis/química , Hyptis/química , Lippia/química , Persea/química , Protetores contra Radiação/análise , Solanum/químicaRESUMO
Milk-derived bioactive peptides with a single activity (e.g., antioxidant, immunomodulatory, or antimicrobial) have been previously well documented; however, few studies describe multifunctional bioactive peptides, which may be preferred over single-activity peptides, as they can simultaneously trigger, modulate, or inhibit multiple physiological pathways. Hence, the aim of this study was to assess the anti-inflammatory, antihemolytic, antioxidant, antimutagenic, and antimicrobial activities of crude extracts (CE) and peptide fractions (<3 and 3-10 kDa) obtained from fermented milks with specific Lactobacillus plantarum strains. Overall, CE showed higher activity than both peptide fractions (<3 and 3-10 kDa) in most of the activities assessed. Furthermore, activity of <3 kDa was generally higher, or at least equal, to the 3 to 10 kDa peptide fractions. In particular, L. plantarum 55 crude extract or their fractions showed the higher anti-inflammatory (723.68-1,759.43µg/mL of diclofenac sodium equivalents), antihemolytic (36.65-74.45% of inhibition), and antioxidant activity [282.8-362.3µmol of Trolox (Sigma-Aldrich, St. Louis, MO) equivalents]. These results provide valuable evidence of multifunctional role of peptides derived of fermented milk by the action of specific L. plantarum strains. Thus, they may be considered for the development of biotechnological products to be used to reduce the risk of disease or to enhance a certain physiological function.
Assuntos
Produtos Fermentados do Leite/análise , Lactobacillus plantarum/fisiologia , Peptídeos/análise , Animais , Anti-Infecciosos/análise , Anti-Inflamatórios/análise , Antimutagênicos/análise , Antioxidantes/análise , Fermentação , Lactobacillus plantarum/genética , Leite/química , Proteínas do Leite/análiseRESUMO
ABSTRACT Tabernaemontana catharinensis A. DC (Apocynaceae) is used as a medicinal plant by the population. In order to contribute to the safe use of the plant as herbal medicine, this study aimed to morphoanatomically characterize the aereal vegetative organs of T. catharinensis and to evaluate the leaves’ mutagenic and antimutagenic activities. Histological blades of leaves and stem of T. catharinensis were performed; the methionine system (methG1) and Aspergillusnidulans conidia germination analysis were employed for mutagenic and antimutagenic evaluation. The morphoanatomic analysis did not show trichomes in the stem, petiole and leaf. Besides, it was observed both the presence of bi-collateral bundles - except in the foliar apex where the bundles were from the collateral type - as well as anamphistomatic leaf with paracyte stomata and sub-epidermal layer in the region of the leaf edges. The mutagenicity/antimutagenicity trial indicated a significant decrease of mutation frequency in comparison with the control group and showed that the T. catharinensis had antimutagenic activity within the type, time and form of treatment. Since the germination test showed that the conidia germination was accelerated from the bud phase, activities at the cell cycle level and polarized growth proved to be possible. The morphoanatomic analysis of the leaf and stem associated with the mutagenic and antimutagenic analyses contributes to the safe use of the plant by humans and also for the quality control of a possible phytotherapeutic drug.
RESUMO Tabernaemontana catharinensis A. DC (Apocynaceae) é utilizada como planta medicinal pela população. A fim de contribuir para o uso seguro da planta como medicinal, este trabalho teve como objetivo caracterizar morfoanatomicamente os órgãos vegetativos aéreos de T. catharinensis e avaliar a atividade mutagênica e antimutagênica de suas folhas. Foram realizados cortes histológicos da folha e do caule de T. catharinensis e, para a avaliação mutagênica e antimutagênica, foi utilizado o sistema metionina (methG1) e análise da germinação de conídios em Aspergillus nidulans. A análise morfoanatômica evidenciou a ausência de tricomas no caule, pecíolo e folha; presença de feixes bicolaterais, com exceção no ápice foliar cujos feixes são do tipo colateral; folha anfiestomática com estômatos paracíticos e camada subepidérmica na região do bordo foliar. O ensaio de mutagenicidade/antimutagenicidade mostrou uma diminuição significativa da frequência de mutação em relação ao controle, indicando que nesse tipo, tempo e forma de tratamento, T. catharinensis apresentou atividade antimutagênica. O ensaio de germinação evidenciou que houve aceleração da germinação dos conídios, a partir da fase de botão, indicando uma possível atuação em nível de ativação de ciclo celular e crescimento polarizado. A análise morfoanatômica da folha e do caule associados à análise mutagênica e antimutagênica, contribuem para o uso seguro da planta pela população e para o controle de qualidade de um possível fitoterápico.
Assuntos
Plantas Medicinais/anatomia & histologia , Antimutagênicos/análise , Tabernaemontana/classificação , Genotoxicidade/métodos , Metionina/farmacologiaRESUMO
BACKGROUND: In various regions of Brazil, several species of the genus Byrsonima (Malpighiaceae) are widely used to treat gastrointestinal complications. This genus has about 150 species of shrubs and trees distributed over the entire Neotropical region. Various biological activities have been identified in these plants, especially antioxidant, antimicrobial and topical and systemic anti-inflammatory activities. The aim of this study was to investigate the mutagenicity and antimutagenicity of hydroalcoholic leaf extracts of six species of Byrsonima: B. verbascifolia, B. correifolia, B. coccolobifolia, B. ligustrifolia, B. fagifolia and B. intermedia by the Salmonella microsome assay (Ames test). METHODS: Mutagenic and antimutagenic activity was assessed by the Ames test, with the Salmonella typhimurium tester strains TA100, TA98, TA97a and TA102, with (+S9) and without (-S9) metabolization, by the preincubation method. RESULTS: Only B. coccolobifolia and B. ligustrifolia showed mutagenic activity. However, the extracts of B. verbascifolia, B. correifolia, B. fagifolia and B. intermedia were found to be strongly antimutagenic against at least one of the mutagens tested. CONCLUSIONS: These results contribute to valuable data on the safe use of medicinal plants and their potential chemopreventive effects. Considering the excellent antimutagenic activities extracted from B. verbascifolia, B. correifolia, B. fagifolia and B. intermedia, these extracts are good candidate sources of chemopreventive agents. However, B. coccolobifolia and B. ligustrifolia showed mutagenic activity, suggesting caution in their use.
Assuntos
Antimutagênicos/análise , Malpighiaceae/química , Mutagênicos/análise , Brasil , Extratos Vegetais/química , Folhas de Planta/química , Plantas , Plantas Medicinais/química , Salmonella , Salmonella typhimuriumRESUMO
Benzo[alpha]pyrene (B[α]P) was used to test the possible antimutagenic effects of Arthrospira (Spirulina) maxima (SP) on male and female mice. SP was orally administered at 0, 200, 400, or 800 mg/kg of body weight to animals of both sexes for 2 weeks before starting the B[α]P (intraperitoneal injection) at 125 mg/kg of body weight for 5 consecutive days. For the male dominant lethal test, each male was caged with two untreated females per week for 3 weeks. For the female dominant lethal test, each female was caged for 1 week with one untreated male. All the females were evaluated 13-15 days after mating for incidence of pregnancy, total corpora lutea, total implants and pre- and postimplant losses. SP protected from B[α]P-induced pre- and postimplant losses in the male dominant lethal test, and from B[α]P-induced postimplantation losses in treated females. Moreover, SP treatment significantly reduced the detrimental effect of B[α]P on the quality of mouse semen. Our results illustrate the protective effects of SP in relation to B[α]P-induced genetic damage to germ cells. We conclude that SP, owing mainly to the presence of phycocyanin, could be of potential clinical interest in cancer treatment or prevention of relapse.
Assuntos
Antimutagênicos/análise , Benzo(a)pireno/antagonistas & inibidores , Dieta , Spirulina , Aborto Animal/prevenção & controle , Animais , Antimutagênicos/administração & dosagem , Cruzamento , Suplementos Nutricionais , Feminino , Masculino , Camundongos , Testes de Mutagenicidade , Mutagênicos , Óvulo/efeitos dos fármacos , Ficocianina/administração & dosagem , Gravidez , Espermatozoides/anormalidades , Espermatozoides/efeitos dos fármacosRESUMO
A espécie Ocimum gratissimum L., popularmente conhecida como alfavaca, é uma planta muito usada na medicina tradicional brasileira, à qual são atribuídas diversas atividades terapêuticas quando usada na forma de infuso de suas folhas. Neste estudo foi realizada a caracterização fitoquímica, a avaliação da ação antioxidante e a investigação dos efeitos antimutagênico e antigenotóxico, além do efeito mutagênico e genotóxico potencial do extrato aquoso liofilizado a parir das folhas de O. gratissimum (EAOG). O conteúdo de polifenóis totais no extrato foi determinado pelo método Folin-Ciocalteu, sendo encontrado 11,3 µg EAG/mg de EAOG. A atividade antioxidante foi avaliada pelo teste do 1,1-difenil-2-picril hidrazil (DPPH), apresentando IC50 de 83,0 µg/mL. A antimutagenicidade e mutagenicidade foram avaliadas em cepas de Salmonella typhimurium (TA98 e TA100) utilizando o teste Salmonella/microssoma (Salmonella typhimurium/microssomas) em diferentes concentrações. EAOG induziu a atividade antimutagênica para a cepa TA98. A mutagenicidade não foi observada para o extrato em ambas as linhagens. Adicionalmente, a ação antigenotoxica avaliada pelo teste de clivagem do DNA-plasmidial também foi observada para EAOG. Os resultados também demonstraram que o extrato não foi capaz de induzir a genotoxicidade pelo teste empregado. Este estudo relata, pela primeira vez, as propriedades antimutagênica e antigenotóxica do extrato aquoso de O. gratissimum.
The species Ocimum gratissimum L., popularly known as Clove Basil, is a plant widely used in traditional Brazilian medicine, and several therapeutic activities are attributed to it when used as infusion of its leaves. In this study, we carried out a phytochemical characterization and the assessment evaluation and investigation of the antioxidant action of the antimutagenic and antigenotoxic effects and the potential mutagenic and genotoxic effects of the freeze-dried aqueous extract of the O. gratissimum (EAOG) leaves. The total polyphenol content in the extract was determined by the Folin-Ciocalteu method, and we found 11.3 µg EAG/mg of EAOG. The antioxidant activity was assessed by the 1,1-diphenyl-2-picryl hidrazil (DPPH·), with IC50 of 83.0 µg/mL. Antimutagenicity and mutagenicity were assessed in Salmonella typhimurium (TA98 and TA100) strains using the Salmonella/microsome (Salmonella typhimurium/microsome) test in different concentrations. EAOG induced antimutagenic activity for strain TA98. Mutagenicity was not observed for the extract in both strains. Additionally, antigenotoxic action, assessed by cleavage of the DNA-damage, was also observed for EAOG. The results also show that the extract was not able to induce genotoxicity by the test used. This study reports for the first time the antimutagenic and antigenotoxic properties of the O. gratissimum aqueous extract.
Assuntos
Extratos Vegetais/classificação , Antimutagênicos/análise , Ocimum/anatomia & histologia , Antioxidantes/análise , Genotoxicidade/análise , /análiseRESUMO
The effect of culinary-medicinal Royal Sun Agaricus (Agaricus brasiliensis) hot water extract on methyl methane sulfonate (MMS) induced mutagenicity/genotoxity in Drosophila melanogaster was studied using a quick and broadly applicable in vivo assay, i.e., the wing somatic mutation and recombination test. We used 2nd instar larvae, trans-heterozygous for the third chromosome recessive markers, i.e., multiple wing hairs (mvh) and flare-3 [flr (3)], and fed them for 24 h with the aqueous extract of A. brasiliensis. For antigenotoxicity studies a 24-h pretreatment with the extract was done, followed by a 48-h treatment of the then 3rd instar larvae with MMS. The frequency of mutations of the wing blade changes (i.e., of the number of wing spots of different sizes) induced in somatic cells was determined as a parameter of genetic changes of the wing imaginal discs. The results showed that A. brasiliensis extract did not cause any genotoxic or mutagenic effects. No antigenotoxic and/or protective effect against the induction of mutations by MMS was observed. Instead, a possible enhanced mitotic recombination frequency by MMS was seen after pretreatment of the larvae with A. brasiliensis extract. Possible mechanisms of action are discussed.
Assuntos
Agaricus/química , Antimutagênicos/farmacologia , Fatores Biológicos/farmacologia , Dano ao DNA/efeitos dos fármacos , Drosophila melanogaster/efeitos dos fármacos , Drosophila melanogaster/genética , Alimento Funcional/análise , Metanossulfonato de Metila/toxicidade , Mutagênicos/toxicidade , Animais , Antimutagênicos/análise , Antimutagênicos/isolamento & purificação , Fatores Biológicos/análise , Fatores Biológicos/isolamento & purificação , Drosophila melanogaster/crescimento & desenvolvimento , Testes de Mutagenicidade , Asas de Animais/efeitos dos fármacos , Asas de Animais/crescimento & desenvolvimentoRESUMO
A Tabebuia impetiginosa, conhecida popularmente como ipê-roxo, é uma planta nativa das florestas tropicais chuvosas da América do Sul e Central. Componentes químicos obtidos da casca têm mostrado efeito terapêutico, como antiinflamatório, antifúngico e antibacteriano. Porém, pela falta de dados na literatura, pouco se sabe sobre os efeitos do extrato das flores. Assim, o objetivo do presente trabalho foi avaliar o potencial mutagênico e antimutagênico do extrato obtido das flores da T. impetiginosa, em três diferentes concentrações (100, 300 e 500 mg kg-1 p.c.) pelo teste do micronúcleo. Para o teste de mutagenicidade, a doxorrubicina (DXR, 90 mg kg-1 p.c.) foi utilizada como indutor de danos no DNA e para o teste de antimutagenicidade, os tratamentos com o extrato foram realizados simultaneamente com este agente químico. O sangue periférico dos animais foi coletado 24 horas após os tratamentos. A comparação da frequência de eritrócitos policromáticos (PCEs) em 400 eritrócitos/animal entre os diferentes grupos não demonstrou qualquer citotoxicidade do extrato. Em relação às frequências de micronúcleos em PCEs (PCEMNs), não foram observadas diferenças significativas entre os grupos tratados com as diferentes concentrações de extrato e o controle negativo. Da mesma forma, todos os grupos de animais que receberam os tratamentos simultâneo do extrato (100, 300 ou 500 mg kg-1 p.c.) com a DXR, apresentaram valores de PCEMNs muito próximos quando comparados com os dados observados no grupo de animais que recebeu somente a DXR. Esses resultados apresentados indicam ausência de efeito mutagênico e antimutagênico do extrato obtido das flores da T. impetiginosa em sistema teste in vivo.
T. impetiginosa, known as "ipê-roxo", is a plant native to tropical rain forests of Central and South Americas. Chemical compounds obtained from its bark have shown anti-inflammatory, antifungal and antibacterial therapeutic effect. However, due to the lack of data in the literature, little is known about the effects of its flower extract. Thus, the aim of this study was to evaluate the mutagenic and antimutagenic potential of the extract obtained from T. impetiginosa flowers at three different concentrations (100, 300 and 500 mg kg-1 p.c.) by the micronucleus test. For the mutagenicity test, doxorubicin (DXR, 90 mg kg-1 p.c.) was used as DNA-damage inducer, while for the antimutagenicity test, treatments with the extract were performed simultaneously with this chemical agent. The peripheral blood of animals was collected 24 hours after the treatments. The frequency of polychromatic erythrocytes (PCEs) in 400 erythrocytes/animal was compared among the different groups and showed no extract cytotoxicity. As regards the frequency of micronuclei in PCEs (PCEMNs), there were no significant differences between the groups treated with different concentrations of extract and the negative control. Similarly, all groups of animals that received the simultaneous extract treatments (100, 300 or 500 mg kg-1 p.c.) with DXR showed very similar values of PCEMNs when compared with the data observed for the group of animals that received DXR alone. These results indicate no mutagenic and antimutagenic effect of the extract obtained from T. impetiginosa flowers in the testing system in vivo.
Assuntos
Animais , Masculino , Ratos , Antimutagênicos/análise , Flores , Testes de Mutagenicidade , Extratos Vegetais , Tabebuia , Análise de Variância , Testes para Micronúcleos/estatística & dados numéricosRESUMO
In the present study, the ability of Punica granatum ethanolic leaf extract (PGL) and Punica granatum ethanolic fruit extract (PGF) to induce mutagenicity or to modulate the genotoxic effects induced by the alkylating agent cyclophosphamide (CP) was evaluated. Swiss male mice were treated by gavage for 10 days with PGL or PGF (12.5, 25, 50, and 75 mg/kg/day) prior to exposure to CP (i.p. 200 mg/kg), 24 h after the end of the treatment. Initial observations revealed that normal mice treated with both extracts (12.5, 25, 50, and 75 mg/kg/day) showed a similar micronucleated polychromatic erythrocyte (MNPCE) frequency to that of the control group. Investigation of the protective effect of PGL and PGF based on data analysis revealed that, irrespective of dose or extract, oral administration of PGL or PGF for 10 days prior to exposure had reduced, in a dose-dependent manner, the frequency of MNPCE induced by CP in all groups studied. Higher reductions were observed at PGF doses of 50 and 75 mg/kg. Taken together, these results demonstrate that mice treated with P. granatum showed an absence of mutagenic effects and dose-dependent protective effects against CP-induced oxidative DNA damage.
No presente estudo investigamos o potencial do extrato etanólico das folhas da Punica granatum (PGFO) e do extrato etanólico dos frutos da Punica granatum (PGFR) de induzir mutagenicidade ou de proteger contra efeitos genotóxicos induzidos pela ciclofosfamida (CF). Camundongos machos Swiss foram tratados por 10 dias, via oral, com PGFO ou PGFR (12,5, 25, 50 e 75 mg/kg/dia), previamente a exposição à CF (i.p. 200 mg/kg) 24 horas após término do tratamento. Observamos que os animais tratados por 10 dias com ambos os extratos (12,5, 25, 50 e 75 mg/kg/dia) demonstraram a frequência de micronúcleo policromático eritrocitário (MNPCE) similar ao grupo controle. Quando aos efeitos protetores dos extratos foram investigados, a análise dos dados revelou que, independentemente da dose ou do extrato usado, a administração oral por 10 dias, previamente à exposição, reduziu, de forma dose-dependente, a frequência de MNPCE induzidos pela CF, em todos os grupos estudados. As maiores reduções foram observadas com PGFR nas doses de 50 e 75 mg/kg. Em conjunto, sob as condições testadas, camundongos tratados com P. granatum demonstraram ausência de efeitos mutagênicos e, de forma dose-dependente, efeitos protetores contra os danos oxidativos do DNA induzidos pela CF.
Assuntos
Masculino , Adulto , Camundongos , Antimutagênicos/análise , /análise , Camundongos , Testes de Mutagenicidade , Mutagênese , Lythraceae/química , Ciclofosfamida/farmacologia , Genotoxicidade/análise , Testes para Micronúcleos , Testes de Mutagenicidade/classificaçãoRESUMO
The present work evaluated the chemical composition of the essential oils (EO) obtained from Lippia origanoides and their DNA protective effect against bleomycin-induced genotoxicity. L. origanoides EO chemical composition was determined by gas chromatography-mass spectrometry (GC-MS). The major compounds of the L. origanoides EOs were thymol (34-58%) and carvacrol (26%). The antigenotoxic effects of the EOs, major compounds and standard compound (epigallocatechin gallate) were assayed in co-incubation procedures using the SOS chromotest in Escherichia coli. Both EOs and their major compounds protected bacterial cells against bleomycin-induced genotoxicity indicating that these two compounds were principally responsible for the antigenotoxicity detected in the oils. Thymol and carvacrol antigenotoxicity was lower than those observed with epigallocatechin gallate. The results were discussed in relation to the chemopreventive potential of L. origanoides EOs and their major components, carvacrol and thymol.
Assuntos
Antimutagênicos/farmacologia , Dano ao DNA/efeitos dos fármacos , Escherichia coli/efeitos dos fármacos , Lippia/química , Monoterpenos/farmacologia , Óleos Voláteis/farmacologia , Extratos Vegetais/farmacologia , Antimutagênicos/análise , Bleomicina , Catequina/análogos & derivados , Técnicas de Cultura de Células , Cimenos , Escherichia coli/genética , Flores , Cromatografia Gasosa-Espectrometria de Massas , Monoterpenos/análise , Óleos Voláteis/química , Extratos Vegetais/química , Folhas de Planta , Timol/análise , Timol/farmacologiaRESUMO
Oxidative damage to biomolecules occurs by the accumulation of molecular damage due to free radicals and/or a diminution of antioxidant protection. The aim of this study was to evaluate the protection of organic and conventional purple grape juices in brain, liver, and plasma from adult Wistar rats (7 months old) against the oxidative damage provoked by carbon tetrachloride (CCl(4)). Adult rats were divided into three groups (control, conventional purple grape juice, and organic purple grape juice). Half of the rats received CCl(4), and the other half received the vehicle (vegetable oil). The chemical analytical determination showed that the highest levels of total phenolic, resveratrol, and catechins were seen in organic purple grape juices. Considering the treatment groups, it was observed that in all tissues (brain structures and liver) and plasma, CCl(4) treatment increased the lipid peroxidation (LP) levels. Both grape juices were capable to reduce LP levels in cerebral cortex and hippocampus; however, in the striatum and substantia nigra only the organic grape juice reduced LP level. CCl(4) caused an increase in catalase activity in cerebral cortex, hippocampus, and substantia nigra and in superoxide dismutase activity in substantia nigra. This increase was reduced by both juices in substantia nigra and hippocampus structures (P < .05). In the alkaline version of the comet assay performed on whole blood, it was observed that CCl(4) was capable of inducing mainly DNA damage class 4 and 3 frequencies, which was significantly reduced in groups that received both purple grape juices. This implies that both grape juices have an important antigenotoxic activity.
Assuntos
Antimutagênicos/farmacologia , Antioxidantes/farmacologia , Encéfalo/efeitos dos fármacos , Doença Hepática Induzida por Substâncias e Drogas/prevenção & controle , Alimentos Orgânicos , Preparações de Plantas/farmacologia , Vitis/química , Animais , Antimutagênicos/análise , Antimutagênicos/uso terapêutico , Antioxidantes/metabolismo , Antioxidantes/uso terapêutico , Bebidas , Encéfalo/metabolismo , Tetracloreto de Carbono , Catalase/metabolismo , Catequina/análise , Catequina/farmacologia , Catequina/uso terapêutico , Dano ao DNA/efeitos dos fármacos , Frutas , Peroxidação de Lipídeos/efeitos dos fármacos , Fígado/efeitos dos fármacos , Fígado/metabolismo , Fenóis/análise , Fenóis/farmacologia , Fenóis/uso terapêutico , Fitoterapia , Preparações de Plantas/química , Preparações de Plantas/uso terapêutico , Distribuição Aleatória , Ratos , Ratos Wistar , Resveratrol , Estilbenos/análise , Estilbenos/farmacologia , Estilbenos/uso terapêuticoRESUMO
Natural oleoresins rich in lycopene were obtained from two varieties of tomato (Zedona and Gironda) and their nutraceutical potential (antioxidant and antimutagenic capacity) was evaluated. Both oleoresins had a high content of lycopene, 58.33+/-1.67 mg/g (Zedona) and 63.97+/-0.80 mg/g (Gironda). The antioxidant activity (AA) of the oleoresins by beta-carotene method were 56.4-74.5% (Zedona) and 51-72.8% (Gironda), while when using the free radical stable 2,2-diphenyl-picryl-hydrazyl (DPPH) method, the antiradical activity (ARA) was determined to be 18.2-32.7% (Zedona) and 16.6-26.7% (Gironda) for the concentrations tested that of 200-400 microM equivalents of lycopene. The antimutagenic activity of the oleoresins was tested against aflatoxin B1 (AFB1) using the microsuspension assay, both varieties had a very high antimutagenic potential against AFB1 (60-66%).These results suggest the NCRT can be taken advantage to obtaining rich oleoresin in lycopene with a nutraceutical value.
Assuntos
Antimutagênicos/metabolismo , Antioxidantes/metabolismo , Carotenoides/metabolismo , Extratos Vegetais/metabolismo , Solanum lycopersicum/química , Aflatoxina B1/toxicidade , Antimutagênicos/análise , Antioxidantes/análise , Carotenoides/análise , Sequestradores de Radicais Livres , Humanos , Licopeno , Extratos Vegetais/análiseRESUMO
Baccharis dracunculifolia De Candole (Asteraceae), a native plant from the Brazilian "cerrado", is widely used in folk medicine as an anti-inflammatory agent and for the treatment of gastrointestinal diseases. B. dracunculifolia has been described as the most important plant source of propolis in southeastern Brazil, which is called green propolis due to its color. The aim of the present study was to evaluate the mutagenic and antimutagenic effects of the ethyl acetate extract of B. dracunculifolia leaves (Bd-EAE) on Chinese hamster ovary cells. On one hand, the results showed a significant increase in the frequencies of chromosome aberrations at the highest Bd-EAE concentration tested (100 microg/mL). On the other hand, the lowest Bd-EAE concentration tested (12.5 micro/mL) significantly reduced the chromosome damage induced by the chemotherapeutic agent doxorubicin. The present results indicate that Bd-EAE has the characteristics of a so-called Janus compound, that is, Bd-EAE is mutagenic at higher concentrations, whereas it displays a chemopreventive effect on doxorubicin-induced mutagenicity at lower concentrations. The constituents of B. dracunculifolia responsible for its mutagenic and antimutagenic effects are probably flavonoids and phenylpropanoids, since these compounds can act either as pro-oxidants or as free radical scavengers depending on their concentration.
Assuntos
Antimutagênicos/análise , Baccharis/química , Aberrações Cromossômicas/induzido quimicamente , Extratos Vegetais/toxicidade , Animais , Células CHO , Cricetinae , Cricetulus , Testes de Mutagenicidade , Extratos Vegetais/químicaRESUMO
Many studies have focused on the effect of fresh fruits on the risk of developing cancer and other diseases involved with reactive species and free radicals. The intake of frozen fruits has spread widely in the last years, but, until now, their biological activity is not completely known. In this study, 23 samples of frozen fruits were analyzed for their nutritional composition, total polyphenols, total carotenoids, and vitamin C content. Antioxidant, mutagenic, and antimutagenic effects were also evaluated. Antioxidant assays included 2,2-diphenyl-1-picrylhydrazyl radical (DPPH(.)) scavenging activity and determination of superoxide dismutase (SOD)- and catalase (CAT)-like activities. Mutagenic and antimutagenic evaluations were performed in eukaryotic cells of Saccharomyces cerevisiae yeast. Most samples (74%) showed antioxidant activity similar to vitamin C in the DPPH(.) assay, and this activity was positively correlated (r = 0.366; P Assuntos
Antimutagênicos/análise
, Antioxidantes/análise
, Congelamento
, Frutas/química
, Mutagênicos/análise
, Antimutagênicos/farmacologia
, Antioxidantes/farmacologia
, Ácido Ascórbico/análise
, Compostos de Bifenilo
, Carotenoides/análise
, Catalase/análise
, Flavonoides/análise
, Manipulação de Alimentos/métodos
, Testes de Mutagenicidade
, Mutagênicos/farmacologia
, Praguicidas/análise
, Fenóis/análise
, Picratos
, Polifenóis
, Saccharomyces cerevisiae/efeitos dos fármacos
, Saccharomyces cerevisiae/genética
, Superóxido Dismutase/análise
RESUMO
Free essential oil methanolic extracts from three different geographical populations of Lippia graveolens in México were screened for antioxidant and antimutagenic properties by the DPPH and Kado microsuspension assay, respectively. Total phenolic and flavonoid contents as well as HPLC identification and quantification of naringenin and rosmarinic acid were also carried out. In addition, a taxonomical phenetic analysis was performed. The L. graveolens extracts showed varying content of phenols and flavonoids. Significant concentration of rosmarinic acid was found for the first time in the species. All the extracts were capable of scavenging DPPH radicals in a concentration dependent fashion; the IC50 values correlate with the phenolic content. None of the extracts was toxic to TA100 and TA98 strains at the concentrations tested; moreover, the extracts at a concentration equivalent to 200 microg of gallic acid inhibited a 39 and 30% the mutagenicity induced by 4-nitro-o-phenylenediamine and sodium azide, respectively. The results suggest that the Mexican oregano is a source of polar bioactive ingredients for the food industry.
Assuntos
Antimutagênicos/farmacologia , Antioxidantes/farmacologia , Lippia/química , Extratos Vegetais/análise , Extratos Vegetais/farmacologia , Análise de Variância , Antimutagênicos/análise , Antioxidantes/análise , Compostos de Bifenilo , Cromatografia Líquida de Alta Pressão/métodos , Flavonoides/análise , Flavonoides/farmacologia , Sequestradores de Radicais Livres , Hidrazinas , Fenóis/análise , Fenóis/farmacologia , Picratos , Óleos de Plantas/análise , Óleos de Plantas/farmacologiaRESUMO
We report for the first time the antioxidant and antimutagenic activities of fractions from Randia echinocarpa fruit, which is a Rubiaceae plant native to Sinaloa, Mexico. This fruit has been traditionally used in the prevention or treatment of cancer, among other diseases. The pulp of the fruit was sequentially extracted with solvents of different polarity (i.e. hexane, chloroform, methanol and water). A high extraction yield was obtained with methanol (72.17% d.w.). The aqueous extract showed the highest content of phenolics (2.27 mg/g as ferulic acid equivalents) and the highest antioxidant activity based on the beta-carotene bleaching method (486.15). The commercial antioxidant BHT was used as control (835.05). Antimutagenic activity of the aqueous extract (0-500 microg/tube) was evaluated using the Salmonella microsuspension assay (YG1024 strain) and 1-NP as the mutagen (50 and 100 ng/tube). The aqueous extract was neither toxic nor mutagenic and the percentage of inhibition on 1-NP mutagenicity was 32 and 53% at doses of 50 and 100 ng/tube, respectively. The results of the double incubation assay suggest that the extract inhibited the mutagenicity of 1-NP by a combination of desmutagenic and bioantimutagenic effects.