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Prepublished online as a Blood First Edition Paper on May 13, 2002; DOI 10.1182/blood-2002-01-0151.

Submitted January 17, 2002
Accepted April 25, 2002
Bay 11-7082 inhibits transcription factor NF- B and induces apoptosis of HTLV-I infected T-cell lines and primary adult T-cell leukemia cells
Naoki Mori*, Yasuaki Yamada, Shuichi Ikeda, Yoshihiro Yamasaki, Kunihiro Tsukasaki, Yuetsu Tanaka, Masao Tomonaga, Naoki Yamamoto, and Masahiro Fujii
Department of Preventive Medicine and AIDS Research, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan
Department of Laboratory Medicine, Nagasaki University School of Medicine, Nagasaki, Japan
Department of Internal Medicine, Sasebo City General Hospital, Sasebo, Japan
Department of Internal Medicine, Kokura Memorial Hospital, Kitakyushu, Japan
Department of Hematology, Molecular Medicine Unit, Atomic Bomb Disease Institute, Nagasaki University School of Medicine, Nagasaki, Japan
Department of Infectious Disease and Immunology, Okinawa-Asia Research Center of Medical Science, Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan
Division of Virology, Niigata University Graduate School of Medicine and Dental Sciences, Niigata, Japan
* Corresponding author; email: n-mori{at}med.u-ryukyu.ac.jp.
Human T-cell leukemia virus type I (HTLV-I) is the causative agent of an aggressive form of leukemia designated as adult T-cell leukemia (ATL). We have previously demonstrated that all T-cell lines infected with HTLV-I and primary leukemic cells from ATL patients display constitutively high activity of transcription factor NF- B. Here we showed that Bay 11-7082, an inhibitor of NF- B, induced apoptosis of HTLV-I infected T-cell lines, but only negligible apoptosis of HTLV-I negative T cells. Bay 11-7082 rapidly and efficiently reduced the DNA binding of NF- B in HTLV-I infected T-cell lines, and down-regulated the expression of the antiapoptotic gene, Bcl-xL, regulated by NF- B, while it little affected the DNA binding of another transcription factor AP-1. Although the viral protein Tax is an activator of NF- B, Bay 11-7082-induced apoptosis of HTLV-I infected cells was not associated with reduced expression of Tax. Furthermore, Bay 11-7082-induced apoptosis of primary ATL cells was more prominent than that of normal peripheral blood mononuclear cells, and apoptosis of these cells was also associated with down-regulation of NF- B activity. Our results indicate that NF- B plays a crucial role in the pathogenesis and survival of HTLV-I infected leukemic cells, and that it is a suitable target for the prevention and treatment of ATL.

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