The indole alkaloid geissoschizoline (1) and two new derivatives, geissoschizoline N4-oxide (2) and 1,2-dehydrogeissoschizoline (3), were obtained from the bark of Geissospermum sericeum together with the β-carboline alkaloid flavopereirine (4). The in vitro antiplasmodial activity of these compounds was evaluated in chloroquine-resistant (K1) and chloroquine-sensitive (T9-96) Plasmodium falciparum. Their cytotoxicity was determined in a human (KB) cell line.
against poliovirus, measles, and Herpes simplex type 1 viruses, as
well as high antiretroviral4 and strong antimitotic activities.5 L.
aestiVum is cultivated on a commercial scale6 for the extraction of
galanthamine, which is widely used as an anti-Alzheimer drug.7
Galanthamine is also obtained via a low-yielding and complex total
synthesis.7,8 Due to the growing demand from the pharmaceutical
market, the supply of this alkaloid is important. In Vitro cultures
of Narcissus confusus (Amaryllidaceae) have been considered as
alternative sources for the production of galanthamine.9 In Vitro
cultures of L. aestiVum have been successfully initiated, and the
influence of cell differentiation on the regulation of galanthamine
accumulation has been shown.10-12
The indole alkaloid geissoschizoline (1) and two new derivatives, geissoschizoline N4-oxide (2) and 1,2-dehydrogeissoschizoline (3), were obtained from the bark of Geissospermum sericeum together with the β-carboline alkaloid flavopereirine (4). The in vitro antiplasmodial activity of these compounds was evaluated in chloroquine-resistant (K1) and chloroquine-sensitive (T9-96) Plasmodium falciparum. Their cytotoxicity was determined in a human (KB) cell line.against poliovirus, measles, and Herpes simplex type 1 viruses, aswell as high antiretroviral4 and strong antimitotic activities.5 L.aestiVum is cultivated on a commercial scale6 for the extraction ofgalanthamine, which is widely used as an anti-Alzheimer drug.7Galanthamine is also obtained via a low-yielding and complex totalsynthesis.7,8 Due to the growing demand from the pharmaceuticalmarket, the supply of this alkaloid is important. In Vitro culturesof Narcissus confusus (Amaryllidaceae) have been considered asalternative sources for the production of galanthamine.9 In Vitrocultures of L. aestiVum have been successfully initiated, and theinfluence of cell differentiation on the regulation of galanthamineaccumulation has been shown.10-12
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