Five-lipoxygenase-activating protein inhibitor MK-886 induces apoptosis in gastric cancer through upregulation of p27kip1 and bax.

Abstract:

BACKGROUND AND AIM:Products of the arachidonic acid metabolizing enzyme, 5-lipoxygenase (5-LOX), stimulate the growth of several cancer types. Inhibitors of 5-LOX and 5-LOX-activating protein (FLAP) induce apoptosis in some cancer cells. Here, the authors investigated the effect of a FLAP inhibitor, MK-886, on the inhibition of proliferation and induction of apoptosis in gastric cancer. METHODS:Cell proliferation in gastric cancer cells was measured using an 3-(4,5-dimethyl-2 thiazoyl)-2,5-diphenyl-2H-tetrazolium bromide assay. Apoptosis was measured using acridine orange staining and flow cytometry. Protein expression of apoptosis-related genes p53, p21waf1, p27kip1, bcl-2 families, cytochrome c, and the caspases were examined using Western blotting. Caspase-3 activity was measured using colorimetric assay of substrate cleavage. RESULTS:MK-886 inhibited cell growth in a dose- and time-dependent manner. Apoptosis was induced in gastric cancer cells and was characterized by upregulation of p27kip1 and bax, with release of cytochrome c from mitochondria into cytosol, which initiated caspase-3 activation. Specific caspase-3 inhibitors partially blocked MK-886-induced apoptosis. CONCLUSION:The present results suggest that MK-886 induces apoptosis in gastric cancer cells through upregulation of p27kip1 and bax, and that MK-886 is a potentially useful drug in gastric cancer prevention and therapy.

authors

Fan XM,Tu SP,Lam SK,Wang WP,Wu J,Wong WM,Yuen MF,Lin MC,Kung HF,Wong BC

doi

10.1111/j.1440-1746.2004.03194.x

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

31-7

issue

1

eissn

0815-9319

issn

1440-1746

pii

3194

journal_volume

19

pub_type

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