Abstract
The bark of the giant neem tree Melia dubia was found to contain 11 euphane-type triterpenes. Five new compounds, meliastatins 1-5 (1-5), proved to inhibit growth of the P388 lymphocytic leukemia cell line (ED(50) 1.7-5.6 microg/mL). Four of the others, the previously known methyl kulonate (8), kulinone (9), 16-hydroxybutyrospermol (10), and kulactone (11), were also found to inhibit (ED(50) 2.5-6.2 microg/mL) the P388 cancer cell line. In addition, two new euphane triterpenes were isolated and named dubione A (6) and dubione B (7). Structures for each of the 11 euphane triterpenes were established by spectral techniques that included HRMS and 2D NMR.
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Antineoplastic Agents, Phytogenic / chemistry
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Antineoplastic Agents, Phytogenic / isolation & purification*
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Antineoplastic Agents, Phytogenic / pharmacology
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Drug Screening Assays, Antitumor
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Leukemia P388
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Melia / chemistry*
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Mice
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Molecular Structure
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Nuclear Magnetic Resonance, Biomolecular
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Philippines
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Plants, Medicinal / chemistry*
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Spectroscopy, Fourier Transform Infrared
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Stereoisomerism
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Triterpenes / chemistry
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Triterpenes / isolation & purification*
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Triterpenes / pharmacology
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Tumor Cells, Cultured / drug effects
Substances
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Antineoplastic Agents, Phytogenic
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Triterpenes