Thalidomide inhibits growth of tumors through COX-2 degradation independent of antiangiogenesis.

Abstract:

:Thalidomide is an antiangiogenic drug and is clinically useful in a number of cancers. However, the molecular mechanism by which thalidomide exerts its antitumor effects is poorly understood. This study was designed to clarify the relationship between antiangiogenesis and antitumor effects of thalidomide and to explore the molecular mechanism for its antitumor activity. We evaluated the effects of thalidomide on the growth of human tumor cells expressing (MCF-7 and HL-60) or not expressing (HeLa and K562) COX-2 in vitro. We also studied the effects of thalidomide on COX-1, COX-2 or bcl-2 expression, TNFalpha, VEGF, GSH and cytochrome c in these cells. Thalidomide could inhibit tumor growth in a concentration-dependent manner in MCF-7 and HL-60; its IC50s for them were 18.36+/-2.34 and 22.14+/-2.15 microM, respectively, while this effect was not observed in HeLa and K562. Thalidomide reduced COX-2 expression accompanied by a decrease of bcl-2 protein, TNFalpha, VEGF, GSH and an increased cytochrome c, but had no effect on that of COX-1, in MCF-7 and HL-60. Moreover, cells not expressing COX-2 were insensitive to the growth-inhibitory and effects on cytokines of thalidomide. In our mouse xenograft model of OVCAR-3 and HCT-8, we found that thalidomide could decrease intratumoral microvessel density in both tumors; it exerted antitumor effects only on OVCAR-3 expressing COX-2 but did not on HCT-8 not expressing COX-2. Effect of thalidomide on COX-1 and COX-2 in vivo was consistent with that of in vitro. These results demonstrated that thalidomide might inhibit growth of tumors through COX-2 degradation independent of antiangiogenesis.

journal_name

Vascul Pharmacol

journal_title

Vascular pharmacology

authors

Du GJ,Lin HH,Xu QT,Wang MW

doi

10.1016/j.vph.2005.04.003

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

112-9

issue

2

eissn

1537-1891

issn

1879-3649

pii

S1537-1891(05)00101-1

journal_volume

43

pub_type

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