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camptotheca/antineoplàstic
L'enllaç es desa al porta-retalls
Pàgina 1 des de 80 resultats
Anticancer drugs from traditional toxic Chinese medicines.
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Many anticancer drugs are obtained from natural sources. Nature produces a variety of toxic compounds, which are often used as anticancer drugs. Up to now, there are at least 120 species of poisonous botanicals, animals and minerals, of which more than half have been found to possess significant
Sites of accumulation of the antitumor alkaloid camptothecin in Camptotheca acuminata.
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Camptothecin is an anticancer and anti-viral alkaloid produced by the Chinese tree Camptotheca acuminata (Nyssaceae). Despite previous reports of low levels of anticancer activity in leaves of Camptotheca acuminata, we have discovered that camptothecin accumulates to approximately 0.4% of the dry
Plant antitumor agents. 22. Isolation of 11-hydroxycamptothecin from Camptotheca acuminata Decne: total synthesis and biological activity.
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The antitumor alkaloid 11-hydroxy-(20S)-camptothecin was isolated from the woody tissue of Camptotheca acuminata. Structural proof derived from comparison with racemic 4 prepared by total synthesis. Antitumor activity of racemic 4 in L1210 leukemia in mice was considerably greater than that of
Ultrasonic/microwave-assisted extraction of polysaccharides from Camptotheca acuminata fruits and its antitumor activity.
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In the present study, an efficient ultrasonic/microwave-assisted extraction (UMAE) procedure for the polysaccharides from the fruit of Camptotheca acuminata (CAFP) was investigated and optimized. Under the optimum conditions (ratio of liquid to raw material 30 mL/g, microwave irradiation time of 20
Antitumor Effects and Biological Mechanism of Action of the Aqueous Extract of the Camptotheca acuminata Fruit in Human Endometrial Carcinoma Cells.
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The aqueous extracts of the leaves and fruit of Camptotheca acuminata have long been used in traditional Chinese medicine (TCM) for treating cancer patients. The chemotherapeutic drug, camptothecin (CPT), and related analogs were first isolated from C. acuminata in the 1970s. Although the antitumor
[Camptothecin and derivatives: a new class of antitumor agents].
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Camptothecin (CPT), an alkaloid isolated from the stem wood and bark of Camptotheca acuminata native to China, was discovered in the early 60's after a systematic screening of natural products by the National Cancer Institute (NCI). This new anticancer agent displays an unique mechanism of action as
Reversed-phase high-performance liquid chromatography method for the simultaneous quantitation of the lactone and carboxylate forms of the novel natural product anticancer agent 10-hydroxycamptothecin in biological fluids and tissues.
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Camptothecins are indole alkaloids isolated from a Chinese tree, Camptotheca acuminata, and have a wide spectrum of anticancer activity in vitro and in vivo. A novel camptothecin congener 10-hydroxycamptothecin (HCPT) has been shown to be more active and less toxic than camptothecin, and the lactone
Preclinical pharmacology of the natural product anticancer agent 10-hydroxycamptothecin, an inhibitor of topoisomerase I.
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OBJECTIVE
10-Hydroxycamptothecin (HCPT) is an indole alkaloid isolated from a Chinese tree, Camptotheca acuminata, and has a wide spectrum of anticancer activity in vitro and in vivo mainly through inhibitory effects on topoisomerase I. HCPT has been shown to be more potent and less toxic than
Antitumor activity and pharmacokinetics following oral administration of natural product DNA topoisomerase I inhibitors 10-hydroxycamptothecin and camptothecin in SCID mice bearing human breast cancer xenografts.
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The DNA topoisomerase I inhibitors, 10-hydroxycamptothecin (HCPT) and camptothecin (CPT), are indole alkaloids isolated from the Chinese tree, Camptotheca acuminata. They have been shown to have a wide spectrum of anticancer activity both in vitro and in vivo. However, their use has been limited due
Mutations in topoisomerase I as a self-resistance mechanism coevolved with the production of the anticancer alkaloid camptothecin in plants.
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Plants produce a variety of toxic compounds, which are often used as anticancer drugs. The self-resistance mechanism to these toxic metabolites in the producing plants, however, remains unclear. The plant-derived anticancer alkaloid camptothecin (CPT) induces cell death by targeting DNA
Anti-cancer drug discovery and development in Brazil: targeted plant collection as a rational strategy to acquire candidate anti-cancer compounds.
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Throughout medical history, plant products have been shown to be valuable sources of novel anti-cancer drugs. Examples are the VINCA: alkaloids, the taxanes, and the camptothecins, derived from the Madagscan periwinkle plant Catharantus roseus, the Pacific yew Taxus brevifolia, and the Chinese tree
Characterization and antitumor activity of camptothecin from endophytic fungus Fusarium solani isolated from Camptotheca acuminate.
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BACKGROUND
Camptothecin (CPT) is a potent drug against cancers, originally from plants. The endophytic fungi could produce the secondary metabolite same as the host and is used as medicine.
OBJECTIVE
The aim of this paper was to investigate an endophytic fungal CPT with anti-neoplastic
De novo genome assembly of Camptotheca acuminata, a natural source of the anti-cancer compound camptothecin.
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Camptotheca acuminata is 1 of a limited number of species that produce camptothecin, a pentacyclic quinoline alkaloid with anti-cancer activity due to its ability to inhibit DNA topoisomerase. While transcriptome studies have been performed previously with various camptothecin-producing species, no
Extraction and composition of three naturally occurring anti-cancer alkaloids in Camptotheca acuminata seed and leaf extracts.
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Naturally occurring camptothecins (CPT) are important sources of chemotherapeutic agents for clinical treatment of cancer. Extraction of CPT from Camptotheca acuminata trees remains to be a cost-effective way in the supply equation compared with a total synthesis. This study conducted a series of
Cellular localisation of the anti-cancer drug camptothecin in Camptotheca acuminata Decne (Nyssaceae).
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In Camptotheca acuminata, we studied the cellular sites of accumulation of the alkaloid camptothecin (CPT), in both plants grown in the field and those grown in a greenhouse, subjecting the latter to stress (i.e., draught, nutritional deficit, and pruning). Fresh sections of the leaf, stem, and root
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