Antineoplastic agents 31. Oenothera caespitosa.
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Biomedical subjects
C P Pase
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Antineoplastic agents, 107. Isolation of acteoside and isoacteoside from Castilleja linariaefolia.
The southwestern Indian paintbrush, Castilleja linariaefolia, yielded extracts that displayed in vivo activity against murine P-388 (PS) lymphocytic leukemia. Separation guided by PS cell line inhibition led to isolation of cytotoxic compounds that were identified as the known glycosides acteoside [1] (ED50 2.6 micrograms/ml) and isoacteoside [2] (ED50 10 micrograms/ml). The identifications were established by spectral measurements and degradation studies. Mannitol was also found in this plant.
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Antineoplastic agents. 52. Baileya multiradiata.
The desert-marigold Baileya multiradiata Harv. and Gray (Compositae) has been found to produce a series of sesquiterpenes that markedly inhibit growth of the murine lymphocytic leukemia P388 and the corresponding in vitro cell line. Separation guided by bioassay led to the isolation of baileyin (1), fastigilins B and C (3a and 2a), radiatin (3b), pleniradin (4a), and the new pseudoguaianolide multiradiatin (2b). The most significant antitumor activity was displayed by fastigilin C (2a) and radiation (3b).
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