Bortezomib induces G2-M arrest in human colon cancer cells through ROS-inducible phosphorylation of ATM-CHK1.

Abstract:

:Colorectal cancer (CRC) is one of the most common cancers; however, the development of drugs to treat the condition has reached a plateau. Bortezomib (PS-341, Velcade®) is a proteasome inhibitor approved for the treatment of hematological malignancies, including multiple myeloma. A few trials of bortezomib, alone or in combination chemotherapy, for CRC patients have been reported; however, the results were largely inconclusive. This may be related to a lack of understanding of the drug's mechanism of action. Although bortezomib is reported to induce apoptosis and cell cycle arrest in various human cancer cells, the inhibitory mechanism involved is not clear. In this study, the effect of bortezomib as a treatment for human CRC was examined in vitro using three CRC cell lines. Bortezomib induced G2-M arrest in CRC cells. Investigation of G2-M phase-related cell cycle proteins involved in the response to bortezomib revealed that the ataxia telangiectasia mutated (ATM)-cell cycle checkpoint kinase 1 (CHK1) pathway, but not ATM and Rad3-related (ATR), was activated, resulting in the inactivation of cdc2. Bortezomib caused an increase in intracellular reactive oxygen species (ROS) and treatment with the ROS scavenger NAC inhibited phosphorylation of ATM leading to a decrease in the number of cells in G2-M phase. Thus, increased ROS levels after exposure to bortezomib resulted in ATM phosphorylation. In addition, knockdown of endogenous ATM by RNA interference resulted in decreased sensitivity to bortezomib. These results suggest that bortezomib induces G2-M arrest through ROS-inducible ATM phosphorylation and demonstrate that bortezomib is a potential candidate for further investigations in the treatment for CRC patients.

journal_name

Int J Oncol

authors

Hong YS,Hong SW,Kim SM,Jin DH,Shin JS,Yoon DH,Kim KP,Lee JL,Heo DS,Lee JS,Kim TW

doi

10.3892/ijo.2012.1448

subject

Has Abstract

pub_date

2012-07-01 00:00:00

pages

76-82

issue

1

eissn

1019-6439

issn

1791-2423

journal_volume

41

pub_type

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