Proteasome inhibitor induces apoptosis through induction of endoplasmic reticulum stress.

Abstract:

:The 26S proteasome is a large multi-subunit protein complex found in the cytoplasm and nucleus of mammalian cells which plays a critical role in intracellular proteolysis. It has been found that the 26S proteasome degrades multiple important substrates which are associated with tumor growth and development. Emerging evidence demonstrates that proteasome inhibition is an innovative and effective approach for treating some human cancers. PS-341 (also known as Velcade or Bortezomib), a specific inhibitor of the 26S proteasome, has been approved for treating multiple myeloma by the FDA. PS-341 mainly exhibits its anti-cancer effect by inducing apoptosis, and has been found to affect several pro- and anti-apoptotic pathways. Activation of the transcription factor nuclear factor kappa B (NF-kappaB), a key survival factor, is dependent on the 26S proteasome. The inhibition of NF-kappaB by PS-341 has been found to induce apoptosis in several human cancer cells and is considered to be one of the primary targets of the PS-341 anti-tumor effect. More recently, studies have suggested that, in addition to the inhibition of pro-survivial NF-kappaB, PS-341 may induce apoptosis by stimulating pro-apoptotic endoplasmic reticulum stress through proteasome inhibition. In this review, we will mainly discuss recent progress on the elucidation of the molecular mechanism of PS-341-mediated apoptosis.

journal_name

Cancer Biol Ther

journal_title

Cancer biology & therapy

authors

Fribley A,Wang CY

doi

10.4161/cbt.5.7.2971

subject

Has Abstract

pub_date

2006-07-01 00:00:00

pages

745-8

issue

7

eissn

1538-4047

issn

1555-8576

pii

2971

journal_volume

5

pub_type

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