RESUMO
MAIN CONCLUSION: Anastomosed laticifers with intrusive growth produce latex containing methyl comate and betulin with economic and ecological value in arid environments. Climatic factors influence laticifer development in the apical meristem and vascular cambium. Latex is a complex emulsion with high medicinal as well as ecological value related to plant survival. Marsdenia zehntneri is a shrubby plant that grows on limestone outcrops in the semiarid regions of Brazil. We sought to characterize the ontogenesis of the laticifers of this species and to relate that process to climatic seasonality and phenology through anatomical, ultrastructural, and micro-morphometric evaluations of the apical meristem and vascular cambium. The histochemistry of the secretory structure was investigated and the chemical composition of the latex was analyzed. Phenological assessments were performed by monitoring phenological events for 1 year. The laticifers network of M. zehntneri permeates the entire primary and secondary body of the plant, providing a wide distribution system of defensive compounds. Its laticifers, of a distinct mixed type (anastomosed, with intrusive growth), are numerous and voluminous in the apical meristem but scarce and minute in the secondary phloem. Latex secretion involves the participation of oleoplasts, polysomes, and dictyosomes. Methyl 2,3-dihydroxy-ursan-23-oate, methyl 3-hydroxy-ursan-23-oate, and betulin are encountered in high proportions in the latex and have ecological and medicinal functions. The development of primary laticifers is related to the resumption of apical meristem activity with increasing day length at the end of the austral winter. The development of secondary laticifers is related to high summer temperatures and rainfall that favor vascular cambium activity. The wide distribution of laticifers, their seasonal pattern of secretion, and their latex composition contribute to the adaptation of M. zehntneri to its natural environment.
Assuntos
Apocynaceae , Marsdenia , Látex , MeristemaRESUMO
ABSTRACT Altered metabolites level in the biosystems, is the potential cause of cancer, the primary reason of alteration of metabolism is change in nutrient consumption and waste excretion, as a result genetic mutation leads to cancer initiation and progression. Aberration of specific metabolites such as fumarate, succinate, 2-hydroxyglutarate may alter cell signaling. We collected liver and kidney samples and prepared for 1H NMR analysis, then executed NMR spectroscopy. We used a set of domestic R scripts to perform an unsupervised principal component analysis (PCA) and a supervised orthogonal signal correction partial least-squares discriminant analysis (OSC-PLS-DA). It signifies class discrimination for getting a clear separation, whereas PCA scores plot signifies the model group kept further away from the control group than drug group on the horizontal axis. In another PCA scores plots, most parts of the control group was overlapping with the drug group but was distant from the model group. Marsdenia tenacissima extract (MTE) (Chines name: Xiao-Ai-Ping, XAP) modulates level of crucial metabolites such as fumarate, lactate, succinate, determined by 1H NMR spectroscopy and their altered level contributes major role in cancer
Assuntos
Animais , Masculino , Feminino , Ratos , Marsdenia/efeitos adversos , Metabolômica/classificação , Neoplasias , Espectroscopia de Ressonância Magnética/métodosRESUMO
An antifungal class III peroxidase was purified from Marsdenia megalantha latex (named Mo-POX) using DEAE-cellulose and gel filtration chromatography on a Superose 12 HR 10/30 column. Mm-POX has an apparent molecular mass of 67.0kDa and a pI of 5.2, shares identity with other peroxidases, and follows Michaelis-Menten kinetics. It has a high affinity for guaiacol and hydrogen peroxide. The pH and temperature optima for Mm-POX were 5.0-7.0 and 60°C, respectively. The catalytic activity of Mm-POX was decreased in the presence of classic peroxidase inhibitors including azide, dithiothreitol, ethylenediamine tetraacetic acid, and sodium metabisulfite and high concentrations of Na+, Mn+, and salicylic acid. In contrast, Ca+ and Mg+, even at low concentrations, enhanced the Mm-POX enzymatic activity. This protein inhibited the germination of the conidia of the phytopathogenic fungi Fusarium oxysporum and Fusarium solani by acting through a membrane permeabilization mechanism. Mm-POX also induced oxidative stress in F. solani. Mm-POX is the first enzyme to be isolated from the M. megalantha species and it has potential use in the control of plant disease caused by important phytopathogenic fungi. This adds biotechnological value to this enzyme.
Assuntos
Permeabilidade da Membrana Celular/efeitos dos fármacos , Fusarium/efeitos dos fármacos , Látex/química , Marsdenia/química , Peroxidase/isolamento & purificação , Peroxidase/farmacologia , Plantas/microbiologia , Sequência de Aminoácidos , Antifúngicos/química , Antifúngicos/isolamento & purificação , Antifúngicos/metabolismo , Antifúngicos/farmacologia , Inibidores Enzimáticos/farmacologia , Estabilidade Enzimática , Fusarium/citologia , Fusarium/metabolismo , Fusarium/fisiologia , Concentração de Íons de Hidrogênio , Cinética , Metais/farmacologia , Viabilidade Microbiana/efeitos dos fármacos , Peso Molecular , Peroxidase/antagonistas & inibidores , Peroxidase/química , Espécies Reativas de Oxigênio/metabolismo , Ácido Salicílico/farmacologia , Esporos Fúngicos/efeitos dos fármacos , Esporos Fúngicos/crescimento & desenvolvimento , Especificidade por Substrato , TemperaturaRESUMO
As plantas do gênero Marsdenia, família Apocynaceae (Asclepiadoideae), apresentam distribuição mundial, embora se encontre predominantemente nas regiões tropicais. Diversas espécies de Marsdenia são usadas na medicina tradicional asiática para o tratamento de dores reumáticas, inflamação, asma, sífilis e câncer. Vários estudos fitoquímicos mostraram que elas contêm glicosídeos esteroides, principalmente derivados de pregnano, mas também alcaloides esteroides, triterpenos e conduritoles. No entanto, casos espontâneos de intoxicação ocorreram em diversas espécies animais, e podem ocorrer em humanos. Assim, as plantas do gênero Marsdenia apresentam enorme potencial para descoberta de novos compostos para uso como medicamentos.
Assuntos
Plantas Medicinais/toxicidade , Marsdenia , Brasil , Apocynaceae , Compostos FitoquímicosRESUMO
Marsdenia tenacissima extract (MTE) is a new plate-derived biotechnology product that is frequently used, but occasionally reported, in the field of chemotherapy. In this study, we assessed the antitumor activity and related mechanisms of MTE by various biotechnological methods. The survival rates of MG63 osteosarcoma cells treated with MTE and doxorubicin were measured, individually or jointly, and the changes in cellular shape, apoptotic rates, and Fas expression were observed. The results indicated that combination of MTE and doxorubicin up-regulated Fas expression and induced apoptosis. The survival rate of combined application of 50 mg/mL MTE and 1 µg/mL doxorubicin was significantly lower than that of the individual application (P < 0.01). Other biotechnology methods also showed an apoptosis-inducing effect of combined application that was much stronger than individual application. All of these results suggested that MTE may promote the effects of doxorubicin chemotherapy, perhaps related to the up-regulation of Fas expression in tumor cells.
Assuntos
Antibióticos Antineoplásicos/farmacologia , Apoptose/efeitos dos fármacos , Doxorrubicina/farmacologia , Marsdenia/química , Extratos Vegetais/farmacologia , Linhagem Celular Tumoral , Sobrevivência Celular/efeitos dos fármacos , HumanosRESUMO
Marsdenia megalantha is a rupicolous shrub with succulent roots from the semiarid region of Brazil that is known to cause fatal poisoning in livestock. We reported spontaneous cases of poisoning by M. megalantha roots in bovine, caprine, ovine, and equine species. The clinical and pathological findings of experimental administration of M. megalantha to sheep, goats, a calf and a pig are reported. Three goats, two sheep and a calf were dosed once orally with freshly chopped roots at dose of 25 g wet plant/kg bw; another sheep and a pig were dosed with 10 g wet plant/kg bw. Poisoning occurred in all of the animals except the three goats. Clinical signs of poisoning included tachycardia, opisthotonus, ruminal bloat, dyspnea, nystagmus, mydriasis, ataxia, and recumbence with paddling movements. Pathological evaluation showed segmental laminar neuronal necrosis and spongiosis in the telencephalic cortex and degeneration of Purkinje cells. The picrate paper procedure detected no cyanide in the plant roots, but the reaction used for nitrate detection gave a strongly positive response. In conclusion, M. megalantha is a poisonous plant that produces acute poisoning characterized mainly by nervous disturbances. Livestock producers should offer alternative food during the dry and early rainy seasons to avoid the poisoning by this plant.
Assuntos
Gado , Marsdenia/toxicidade , Doenças do Sistema Nervoso/induzido quimicamente , Intoxicação por Plantas/etiologia , Doença Aguda , Ração Animal , Animais , Bovinos , Modelos Animais de Doenças , Cabras , Doenças do Sistema Nervoso/patologia , Intoxicação por Plantas/patologia , Plantas Tóxicas/toxicidade , Ovinos , SuínosRESUMO
Background: Use of ultra-high diluted remedies in homeopathy and their claimed efficacy in curing diseases has been challenged time and again by non-believers despite many evidence-based positive results published in favor of their efficacy in curing/ameliorating disease symptoms. Aims: To test the ability of ultra-high diluted homeopathic remedies beyond Avogadros limit, if any, in manifesting gene modulating effects in controlled in vitro experimental model. Methods: Since cancer cells manifest aberrant epigenetic gene expressions, we conducted global microarray gene expression profiling of HeLa cells (an established epigenetic model of HPV18 positive cell line) treated with two different potentized homeopathic remedies, namely, Condurango 30c and Hydrastis canadensis 30C (used in the treatment of cancer), as compared to that of placebo (succussed alcohol 30c). Results: Data revealed distinctly different expression patterns of over 100 genes as a consequence of treatment with both homeopathc remedies compared to placebo. Conclusion: Results indicate that action of the potentized drugs was more than placebo and these ultra-highly diluted drugs acted primarily through modulation of gene expression.
Introdução: O uso de medicamentos homeopáticos ultra-diluídos e a sua presumível eficácia na cura de doenças têm sido reiteradamente contestados por céticos, apesar dos muitos resultados positivos, baseados em evidências, demonstrando a sua eficácia na cura/melhora de sintomas patológicos. Objetivos: Testar a possível capacidade de medicamentos homeopáticos diluídos além do limite de Avogadro para apresentar efeitos de modulação genética em modelo experimental in vitro. Métodos: Sendo que as células neoplásicas manifestam expressões epigenéticas aberrantes, investigamos através de micro-arranjo o perfil global de expressão genética de células HeLa (modelo epigenético já estabelecido de linhas celulares HPV18 positivas) tratadas com 2 medicamentos homeopáticos dinamizados, a saber, Condurango 30c e Hydrastis canadensis 30c (utilizados no tratamento de neoplasias) comparados com um placebo (álcool sucussionado 30c). Resultados: Os dados indicaram diferentes perfis de expressão em mais de 100 genes nas células tratadas com os medicamentos homeopáticos por comparação ao placebo. Conclusão: Os resultados indicam que o efeito dos medicamentos dinamizados foi mais do que placebo e que essa ação foi principalmente mediada por modulação da expressão genética.
Assuntos
Altas Potências , Dinamização , Hydrastis/análise , Marsdenia , Células HeLa , PlacebosRESUMO
Background: Use of ultra-high diluted remedies in homeopathy and their claimed efficacy in curing diseases has been challenged time and again by non-believers despite many evidence-based positive results published in favor of their efficacy in curing/ameliorating disease symptoms. Aims: To test the ability of ultra-high diluted homeopathic remedies beyond Avogadros limit, if any, in manifesting gene modulating effects in controlled in vitro experimental model. Methods: Since cancer cells manifest aberrant epigenetic gene expressions, we conducted global microarray gene expression profiling of HeLa cells (an established epigenetic model of HPV18 positive cell line) treated with two different potentized homeopathic remedies, namely, Condurango 30c and Hydrastis canadensis 30C (used in the treatment of cancer), as compared to that of placebo (succussed alcohol 30c). Results: Data revealed distinctly different expression patterns of over 100 genes as a consequence of treatment with both homeopathc remedies compared to placebo. Conclusion: Results indicate that action of the potentized drugs was more than placebo and these ultra-highly diluted drugs acted primarily through modulation of gene expression. (AU)
Introdução: O uso de medicamentos homeopáticos ultra-diluídos e a sua presumível eficácia na cura de doenças têm sido reiteradamente contestados por céticos, apesar dos muitos resultados positivos, baseados em evidências, demonstrando a sua eficácia na cura/melhora de sintomas patológicos. Objetivos: Testar a possível capacidade de medicamentos homeopáticos diluídos além do limite de Avogadro para apresentar efeitos de modulação genética em modelo experimental in vitro. Métodos: Sendo que as células neoplásicas manifestam expressões epigenéticas aberrantes, investigamos através de micro-arranjo o perfil global de expressão genética de células HeLa (modelo epigenético já estabelecido de linhas celulares HPV18 positivas) tratadas com 2 medicamentos homeopáticos dinamizados, a saber, Condurango 30c e Hydrastis canadensis 30c (utilizados no tratamento de neoplasias) comparados com um placebo (álcool sucussionado 30c). Resultados: Os dados indicaram diferentes perfis de expressão em mais de 100 genes nas células tratadas com os medicamentos homeopáticos por comparação ao placebo. Conclusão: Os resultados indicam que o efeito dos medicamentos dinamizados foi mais do que placebo e que essa ação foi principalmente mediada por modulação da expressão genética. (AU)
Assuntos
Dinamização , Marsdenia , Hydrastis/análise , Altas Potências , Papillomavirus Humano 18 , Células HeLaRESUMO
Neurological signs were observed in cattle consuming the roots of Marsdenia hilariana and sheep consuming leaves of Marsdenia megalantha. Similar nervous signs to those observed in spontaneous poisoning were induced experimentally by the administration of roots of M. hilariana to goats, and by the administration of leaves and roots of M. megalantha to sheep. No lesions were observed at necropsies and on histological examination of the nervous system and other tissues.