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3.
Fitoterapia ; 140: 104434, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31760067

RESUMO

Fritillaria cirrhosa bulbus is a Chinese folk herb famous for its antitussive, expectorant, anti-asthma and anti-inflammatory properties, and is widely used to treat respiratory diseases. However, the impacts of F. cirrhosa bulbus on oxidative stress are still unkown. In the present study, we investigated the potential effect and mechanism of six isosteroid alkaloids with different chemical structures from F. cirrhosa bulbus on protection against cigarette smoke-induced oxidative stress in RAW264.7 macrophages. The results showed that six isosteroid alkaloids reduced reactive oxygen species (ROS) production, elevated glutathione (GSH) level and promoted heme oxygenase (HO-1) expression, which is in association with induction of NF-E2-related factor 2 (Nrf2) nuclear translocation and up-regulation of Nrf2 expression. Among these alkaloids, verticinone, verticine, imperialine-3-ß-D-glucoside, delavine and peimisine exhibited more potent effect against CSE-induced oxidative stress than that of imperialine. These findings for the first time demonstrated that F. cirrhosa bulbus may play a protective role in cellular oxidative stress by activating Nrf2-mediated antioxidant pathway. Furthermore, the differences in antioxidant effects of these alkaloids were compared, as well as the corresponding structure-activity relationships were preliminarily elucidated. This suggested that F. cirrhosa bulbus might be a promising therapeutic treatment for the prevent of oxidative stress-related diseases.


Assuntos
Alcaloides/farmacologia , Fritillaria/química , Estresse Oxidativo/efeitos dos fármacos , Fumaça/efeitos adversos , Alcaloides/isolamento & purificação , Animais , Glutationa/metabolismo , Heme Oxigenase-1/metabolismo , Proteínas de Membrana/metabolismo , Camundongos , Estrutura Molecular , Fator 2 Relacionado a NF-E2/metabolismo , Compostos Fitoquímicos/isolamento & purificação , Compostos Fitoquímicos/farmacologia , Raízes de Plantas/química , Plantas Medicinais/química , Células RAW 264.7 , Espécies Reativas de Oxigênio/metabolismo , Relação Estrutura-Atividade , Produtos do Tabaco
4.
Int Immunopharmacol ; 78: 106047, 2020 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-31816576

RESUMO

Isosteroid alkaloids, natural products from Fritillariae Cirrhosae Bulbus, are well known for its antitussive, expectorant, anti-asthmatic and anti-inflammatory properties. However, the anti-inflammatory effect and its mechanism have not been fully explored. In this study, the anti-inflammatory activitives and the potential mechanisms of five isosteroid alkaloids from F. Cirrhosae Bulbus were investigated in lipopolysaccharide (LPS)-induced RAW264.7 macrophage cells. The pro-inflammatory mediators and cytokines were measured by Griess reagent, ELISA and qRT-PCR. The expression of MAPKs was investigated by western blotting. Treatment with the five isosteroid alkaloids in appropriate concentrations could reduce the production of nitric oxide (NO), tumor necrosis factor α (TNF-α) and interleukin-6 (IL-6) in supernatant, and suppressed the mRNA expressions of TNF-α and IL-6. Meanwhile, the five isosteroid alkaloids significantly inhibited the phosphorylated activation of mitogen activated protein kinase (MAPK) signaling pathways, including extracellular signal-regulated kinase (ERK1/2), p38 MAPK and c-Jun N-terminal kinase/stress-activated protein kinase (JNK/SAPK). These results demonstrated that isosteroid alkaloids from F. Cirrhosae Bulbus exert anti-inflammatory effects by down-regulating the level of inflammatory mediators via mediation of MAPK phosphorylation in LPS-induced RAW264.7 macrophages, thus could be candidates for the prevention and treatment of inflammatory diseases.

5.
Curr Protein Pept Sci ; 19(3): 302-310, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-28059041

RESUMO

Isosteroidal alkaloids are a category of promising bioactive compounds which mostly exist in plants of genus Veratrum and Fritillaria. The pharmacological activities of isosteroidal alkaloids include antihypertensive, antitussive, anti-inflammatory, antithrombosis, among others. Recently, some studies show that this kind of alkaloids exhibited significant antitumor activity. To the best of our knowledge, there is no review focusing on their antitumor activity and mechanism of their antitumor activity. To fill the gap, in this review, we summarized antitumor effects of the isosteroidal alkaloids from genus Veratrum and Fritillaria on different tumors and the mechanisms of their antitumor activity. In conclusion, this kind of alkaloids has extensive antitumor activity, and there are several main mechanisms of their antitumor activity, including the Hedgehog signaling pathway, caspase-3 dependent apoptosis, cell cycle, and autophagy.


Assuntos
Alcaloides/química , Alcaloides/farmacologia , Antineoplásicos Fitogênicos/química , Antineoplásicos Fitogênicos/farmacologia , Fritillaria/química , Neoplasias/tratamento farmacológico , Veratrum/química , Alcaloides/uso terapêutico , Animais , Antineoplásicos Fitogênicos/uso terapêutico , Apoptose/efeitos dos fármacos , Autofagia/efeitos dos fármacos , Ciclo Celular/efeitos dos fármacos , Proteínas Hedgehog/metabolismo , Humanos , Neoplasias/metabolismo , Neoplasias/patologia , Transdução de Sinais/efeitos dos fármacos , Alcaloides de Veratrum/química , Alcaloides de Veratrum/farmacologia , Alcaloides de Veratrum/uso terapêutico
6.
Biomed Res Int ; 2014: 258402, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24804207

RESUMO

The bulbs of cultivated Fritillaria cirrhosa (BCFC) are used in China both for food and folk medicine due to its powerful biological activities. The aim of this study is to optimize the extraction and enrichment conditions of alkaloids from BCFC. Firstly, the orthogonal experimental design was used to optimize and evaluate four variables (ethanol concentration, solid-liquid ratio, extraction time, and temperature). Thereafter, resin adsorption was as a means to enrich alkaloids. Among 16 tested resins, H-103 resin presented higher adsorption capacity and desorption ratio. The equilibrium experimental data of the adsorption of total alkaloids, imperialine, and peimisine were well-fitted to the pseudo-first-order kinetics model, Langmuir and Freundlich isotherms models. Finally, in order to optimize the parameters for purifying alkaloids, dynamic adsorption and desorption tests were carried out. After one run treatment with H-103 resin, the contents of total alkaloids, imperialine, and peimisine in the product were 21.40-, 18.31-, and 22.88-fold increased with recovery yields of 94.43%, 90.57%, and 96.16%, respectively.


Assuntos
Alcaloides/química , Alcaloides/isolamento & purificação , Fritillaria/química , Esteroides/química , Esteroides/isolamento & purificação
7.
J Air Waste Manag Assoc ; 55(12): 1816-26, 2005 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-16408686

RESUMO

This paper analyzes the air quality impacts of coal-fired power plants in the northern passageway of the West-East Power Transmission Project in China. A three-layer Lagrangian model called ATMOS, was used to simulate the spatial distribution of incremental sulfur dioxide (SO2) and coarse particulate matter (PM10) concentrations under different emission control scenarios. In the year 2005, the emissions from planned power plants mainly affected the air quality of Shanxi, Shaanxi, the common boundary of Inner Mongolia and Shanxi, and the area around the boundary between Inner Mongolia and Ningxia. In these areas, the annually averaged incremental SO2 and PM10 concentrations exceed 2 and 2.5 microg/m3, respectively. The maximum increases of the annually averaged SO2 and PM10 concentrations are 8.3 and 7.2 microg/m3, respectively, which occur around Hancheng city, near the boundary of the Shaanxi and Shanxi provinces. After integrated control measures are considered, the maximum increases of annually averaged SO2 and PM10 concentrations fall to 4.9 and 4 microg/m3, respectively. In the year 2010, the areas affected by planned power plants are mainly North Shaanxi, North Ningxia, and Northwest Shanxi. The maximum increases of the annually averaged SO2 and PM10, concentrations are, respectively, 6.3 and 5.6 microg/m3, occurring in Northwest Shanxi, which decline to 4.4 and 4.1 microg/m3 after the control measures are implemented. The results showed that the proposed power plants mainly affect the air quality of the region where the power plants are built, with little impact on East China where the electricity will be used. The influences of planned power plants on air quality will be decreased greatly by implementing integrated control measures.


Assuntos
Poluentes Atmosféricos , Carvão Mineral , Poeira , Centrais Elétricas , Dióxido de Enxofre , Poluentes Atmosféricos/análise , Poluição do Ar/prevenção & controle , China , Previsões , Modelos Teóricos , Dióxido de Enxofre/análise
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