A novel spider peptide toxin suppresses tumor growth through dual signaling pathways.

Abstract:

:Spider venom is a large pharmacological repertoire containing many biologically active peptides, which may have a potent therapeutic implication. Here we investigated a peptide toxin, named lycosin-I, isolated from the venom of the spider Lycosa singoriensis. In contrast to most spider peptide toxins adopting inhibitor cystine knot (ICK) motif, lycosin-I shows a linear amphipathic alpha-helical conformation, common to α-helical host defense peptides. Lycosin-I displays strong ability to inhibit cancer cell growth in vitro and can effectively suppresses tumor growth in vivo. Mechanistically, it activates the mitochondrial death pathway to sensitize cancer cells for apoptosis, as well as up-regulates p27 to inhibit cell proliferation. Taken together, our results provide the first evidence that a spider toxin can effectively suppress tumorigenesis through activation of dual signaling pathways. In addition, lycosin-I may be a useful structural lead for the development of novel anticancer drugs.

journal_name

Curr Mol Med

authors

Liu Z,Deng M,Xiang J,Ma H,Hu W,Zhao Y,Li DW,Liang S

doi

10.2174/156652412803833643

subject

Has Abstract

pub_date

2012-12-01 00:00:00

pages

1350-60

issue

10

eissn

1566-5240

issn

1875-5666

pii

CMM-EPUB-20120813-1

journal_volume

12

pub_type

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