Alkaloids from Leucojum vernum and antiretroviral activity of Amaryllidaceae alkaloids

Planta medica
László SzlávikJudit Hohmann

Abstract

Three alkaloids, lycorine, homolycorine and 2- O-acetyllycorine, were isolated from the bulbs of Leucojum vernum (Amaryllidaceae) and identified by means of NMR analysis. The alkaloids obtained from L. vernum and from other Amaryllidaceae species were studied in vitro for HIV-1 replication inhibitory activity on MT4 cells. The cytotoxicity of the compounds in uninfected cells was evaluated by using the MTT assay and the [ (3)H]thymidine incorporation test. The antiviral activities were determined by means of the p24 antigen assay and solid-phase reverse transcriptase testing. The results demonstrate that trisphaeridine, lycorine, homolycorine, and haemanthamine possess high antiretroviral activities (IC (50) = 0.4 - 7.3 microg/mL), accompanied by low therapeutic indices (TI (50) = 1.3 - 1.9).

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