TAILIEUCHUNG - PLANTS THAT FIGHT CANCER - PART 8

gây độc tế bào, chỉ ra rằng quá trình oxy hóa làm tăng hoạt động. Bốn desmosterols thêm oxy hóa (R-8 R-11) được phân lập từ các sinh vật tương tự và trưng bày độc tế bào quan trọng đối với P-388, KB, A-549 và ung thư HT-29 | 212 Vassilios Roussis et al. Cytotoxic metabolites from chlorophyta C-1 C-2 D-altoIleu-2 L-Orn C-4 OAc C-5 C-7 OAc CHO C-6 OAc C-8 OAc R2 H C-9 O C-10 H C-11 H C-12 C-14 Br HO Br C-13 C-15 Cytotoxic metabolites from marine algae 213 Br Br C-16 Br C-18 C-17 C-19 Br OH C-20 OSO3Na C-21 NaO3SO C-22 OSO3Na NaO3SO C-23 cytotoxic indicating that oxidation increases the activity. Four additional oxygenated desmosterols R-8 to R-11 were isolated from the same organism and exhibited significant cytotoxicity against P-388 KB A-549 and HT-29 cancer cell lines with ED50 values within the range of gmL 1. From the red algae Gigartina tenella a sulfolipid R-12 that belongs to the class of sulfoquinovosyldiacyl glycerol was isolated. The compound potently inhibited the activities of mammalian DNA polymerase a and p and terminal deoxynucleotidyl transferase TdT and enhanced the cytotoxicity of bleomycin. Complete inhibition doses of each were achieved at M for polymerase a and TdT and M for polymerase p. Three new Malyngamides Malyngamide M R-13 Malyngamide N R-14 and Malyngamide I acetate R-15 were isolated from the Hawaiian red alga Gracilaria coronopifolia. Malyngamide N and Malyngamide I acetate showed moderate cytotoxicity to mouse neuroblastoma NB cells in the tissue culture. The IC50 values of R-14 and R-15 were 12 M gmL and 12 M gmL respectively. In contrast Malyngamide M showed rather weak cytotoxicity to NB cells IC50 20 M . Malyngamides are known as metabolites of blue green algae in particular Lyngbya majuscula. Furthermore it has been reported that epiphytes such as blue green algae grow on Gracilaria. Therefore the true origin of R-13 to R-15 is likely a blue green alga that grows on Gracilaria coronopifolia. A cytotoxic oxysterol 16j8-hydroxy-5a-cholestane-3 6-dione R-16 was isolated from the red algaJania rubens and was found to be significantly cytotoxic towards the KB tumor cell line with an ID50 value 1. 214 Vassilios .

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