Induction of apoptosis by G3139 in melanoma cells.

Abstract:

:G3139 is an 18mer phosphorothioate oligonucleotide targeted to the initiation codon region of the Bcl-2 mRNA. Because of the ability of this antisense construct to downregulate the expression of Bcl-2 mRNA and protein, it has entered phase III clinical trials in a number of human cancers, including advanced melanoma. However, the actual mechanism of this agent is far from certain. In this work, we demonstrate that G3139 induces the relatively rapid release of cytochrome c into the cytoplasm of treated 518A2 melanoma cells. This release activates the intrinsic pathway of apoptosis, eventually leading to a mitochondrial permeability transition and cell death. By employing an siRNA strategy, we also show that this entire process appears to be Bcl-2 independent, as downregulation of Bcl-2 protein expression does not alter the induction of apoptosis by G3139. Furthermore, forced overexpression of Bcl-2 protein contributes relatively little to chemoresistance in this cell line. While these results may or may not be reflective of the in vivo situation, the value of Bcl-2 as a target in advanced melanoma must at least be questioned.

journal_name

Ann N Y Acad Sci

authors

Benimetskaya L,Lai JC,Khvorova A,Wu S,Miller P,Stein CA

doi

10.1196/annals.1359.033

subject

Has Abstract

pub_date

2005-11-01 00:00:00

pages

235-45

eissn

0077-8923

issn

1749-6632

pii

1058/1/235

journal_volume

1058

pub_type

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