The effects of Caulerpa microphysa enzyme-digested extracts on ACE-inhibitory activity and in vitro anti-tumour properties

The aim of this study was to determine the ACE inhibitory activity and its anti-cancer properties of Caulerpa microphysa extracts. C. microphysa samples were digested with Flavourzyme, Alcalase, and pepsin. The ACE inhibitory activity of enzyme-digested C microphysa decreased in the order of digestion with pepsin > Flavourzyme > Alcalase; that is, pepsin-extracted samples had significantly higher activity than the other enzyme extractions. To test its anti-tumour effects in vitro C microphysa pepsin-digested extracts were applied to BALB/c mice with transplanted myelomonocytic leukaemia (WEHI-3) and Human promyelocytic leukaemia (HL-60) cell lines. The growth of both cell lines was inhibited, and extracts induced DNA damage, evaluated with a comet assay. The data demonstrate that C microphysa pepsin-digested extract had the ability to anti-tumour effects. Further application as a health food is worthy of investigation. (C) 2012 Elsevier Ltd. All rights reserved.