acnistus/krabbamein

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Tumor inhibitors. XXXIX. Active principles of Acnistus arborescens. Isolation and structural and spectral studies of withaferin A and withacnistin.

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The isolation and structural elucidation of a novel steroidal tumor inhibitor from Acnistus arborescens.

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Cytotoxicity of withanolides isolated from Acnistus arborescens.

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A new withanolide identified by spectroscopic analysis as 12beta-acetoxy-4-deoxy-5,6-deoxy-Delta(5)-withanolide D and Withanolide D, were isolated from the leaves of Acnistus arborescens. Cytotoxic activity of these two compounds against human tumor cell lines HT-29, MCF-7, MKN-45, HEp-2, HeLa,

Cytotoxic withaphysalins from the leaves of Acnistus arborescens.

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Three withaphysalins, rel-(17S,20R,22R)-5 beta,6 beta:18,20-diepoxy-4 beta-hydroxy-1,18-dioxowitha-2,24-dienolide(withaphysalin M) (1), rel-(17S,20R,22R)-5 beta,6 beta:18,20-diepoxy-4 beta-hydroxy-18-ethoxy-1-oxowitha-2,24-dienolide (withaphysalin F ethyl ether, withaphysalin O) (2), and

Cytotoxic epimeric withaphysalins from leaves of Acnistus arborescens.

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Phytochemical analysis of the leaves of Acnistus arborescens (Solanaceae) resulted in the isolation of two new epimeric withaphysalins (17S,20R,22R)-5beta,6beta: 18,20-diepoxy-4beta,18-dihydroxy-1-oxowitha-24-enolide (2, 18R and 18S), together with the known withaphysalin F (1, 18R and 18S). Their

Selective cytotoxicity of withaphysalins in myeloid leukemia cell lines versus peripheral blood mononuclear cells.

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Withaphysalins are C(28)-steroidal lactones structurally based on the ergostane skeleton that possess antiproliferative activity against tumor cell lines. In the present study, the antileukemic actvity of withaphysalin O (1), M (2), and N (3) isolated from Acnistus arborescens, against two leukemic

Cell cycle arrest through inhibition of tubulin polymerization by withaphysalin F, a bioactive compound isolated from Acnistus arborescens.

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Many compounds used in the treatment of cancer possess tubulin-interacting properties that lead to mitotic arrest. Withaphysalins are potent cytotoxic compounds that are commonly found in plants belonging to the Solanaceae family, such as Acnistus arborescens; however, the cytotoxic mechanisms or

Withanolides from leaves of cultivated Acnistus arborescens.

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Seven withanolides, including four previously unknown, were isolated from the acetone and ethanol extracts of cultivated specimens of Acnistus arborescens. These four compounds were identified as rel-(18R,22R)-5β,6β:18β,20-diepoxy-3β,18α-dimethoxy-4β-hydroxy-1-oxowith-24-enolide,

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