RESUMO
Objective: To isolate and identify the polyphenolic constituents of Dypsis lutescens, and evaluate the hepatoprotective activity of the ethanolic extract of Dypsis lutescens leaves. Methods: Hepatoprotective, antioxidant and anti-inflammatory effects of two doses of Dypsis lutescens ethanolic leaf extract were investigated in five groups of six rats each administered with the ethanolic extract of Dypsis lutescens leaves. Liver function parameters were assessed, histopathological study was carried out, the anti-inflammatory mediators and the antioxidant potential in the liver tissues were evaluated. In addition, the total ethanolic extract of Dypsis lutescens leaves was subjected to different chromatographic separation techniques to yield ten phenolic compounds. The isolated compounds structures were spectroscopically elucidated. Results: Hepatoprotective activity of Dypsis lutescens ethanolic extract was estimated for the first time and showed significant activity against histopathological changes induced by D-galactosamine in liver. The extract improved the liver functions. Compared to the D-galactosamine group, the architecture of the liver in the treated groups was improved in the histopathological examination. These results proved the hepatoprotective activity of Dypsis lutescens and its ability in attenuating liver oxidative damage and inflammation. Phytochemical investigations of the total extract afforded ten compounds from the genus Dypsis. Conclusions: The alcoholic extract of Dypsis lutescens exerted potential hepatoprotective action, maintaining liver health and functions.
RESUMO
In the present study, a new ceramide, namely 2S, 3R-4E, 8E-2-(heptadecanoylamino)-heptadeca-4, 8-diene-1, 3-diol (1), along with four known steroids, including 24-methylcholesta-5, 24(28)-diene-3β-ol (2), 24-methylcholesta-5, 24(28)-diene-3β-acetate (3), 4-methyl-24-methylcholesta-22-ene-3-ol (4), and cholesterol, was isolated and characterized from CHCl/MeOH extract of Cespitularia stolonifera. A new acetate derivative of compound 1, termed 2S, 3R-4E, 8E-2-(heptadecanoylamino)-heptadeca-4, 8-diene-1, 3-diacetate (1a), was also prepared in the present study. All the structures were established on the basis of modern spectroscopic techniques, including FT-IR, 1D, 2D-NMR, HRESI-MS, and GC-MS, in addition of chemical methods. (-)-Alloaromadendren, ledane, (1)-alloaromadendren oxide, isoaromadendrene epoxide and (-)-caryophellen oxide were identified from the n-hexane fraction using GC-MS. The extract and the two ceramides (1) and (1a) exhibited significant cytotoxic activity against lung cancer A549 cells, while the extract and the two steroids (2) and (3) exhibited significant cytotoxic activity against breast cancer MCF-7 cells. The CHCl/MeOH extract exhibited significant antiulcer activity in both ethanol and acetic acid induced ulcer models in rats, as evidenced by histopathological, histochemical, and biochemical examinations.
Assuntos
Animais , Feminino , Humanos , Ratos , Células A549 , Ácido Acético , Antozoários , Química , Antiulcerosos , Química , Farmacologia , Usos Terapêuticos , Antineoplásicos , Química , Farmacologia , Usos Terapêuticos , Produtos Biológicos , Química , Farmacologia , Usos Terapêuticos , Neoplasias da Mama , Tratamento Farmacológico , Ceramidas , Química , Farmacologia , Usos Terapêuticos , Modelos Animais de Doenças , Etanol , Neoplasias Pulmonares , Tratamento Farmacológico , Células MCF-7 , Espectroscopia de Ressonância Magnética , Métodos , Espectroscopia de Infravermelho com Transformada de Fourier , Métodos , Esteroides , Química , Farmacologia , Usos Terapêuticos , Úlcera , Tratamento FarmacológicoRESUMO
Experimental diabetes was induced in twenty rats using alloxan monohydrate. Another group of [10] normal rats of the same age and weight were served as control. Horse radish peroxidase [HRP] was injected I. V to demonstrate vascular permeability changes in sciatic nerves of these rats. Electron microscopic examination of ultrathin sections of sciatic nerves revealed that HRP reaction product was seen between the perineurial cells and within pinocytic vesicles of these cells in sciatic nerves of diabetic rats indicating failure of normal blood-nerve diffusion barrier. HRP reaction product was observed in the epineurium and did not penetrate into the endoneurium in sections of sciatic nerves of normal rats indicating normal blood-nerve diffusion barrier. It can be concluded that an increase in vascular permeability does occur in diabetic rats, resulting in impairment of blood-nerve diffusion barrier. The possible pathogenesis will be discussed