Volume 119, Issue 7 pp. 1648-1653
Early Detection and Diagnosis

Down-regulation of ASY/Nogo transcription associated with progression of adult T-cell leukemia/lymphoma

Misuzu Shimakage

Corresponding Author

Misuzu Shimakage

Clinical Research Institute, National Hospital Organization, Osaka National Hospital, Chuo-ku, Osaka, Japan

Fax: +011-81-738-23-3104.

Department of Pediatrics, National Hospital Organization, Wakayama National Hospital, 1138 Wada, Mihama-Cho, Hidaka-gun, Wakayama 644-0044, JapanSearch for more papers by this author
Nobumasa Inoue

Nobumasa Inoue

Department of Internal Medicine, National Hospital Organization, Osaka National Hospital, Chuo-ku, Osaka, Japan

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Kohichi Ohshima

Kohichi Ohshima

First Department of Pathology, Faculty of Medicine, Fukuoka University, Johnan-ku, Fukuoka, Japan

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Kunimitsu Kawahara

Kunimitsu Kawahara

Department of Pathology, National Hospital Organization, Osaka National Hospital, Chuo-ku, Osaka, Japan

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Takashi Oka

Takashi Oka

Department of Pathology, Graduate School of Medicine and Dentistry, Okayama University, Okayama, Japan

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Kazuta Yasui

Kazuta Yasui

Osaka Red Cross Blood Center, Joto-ku, Osaka, Japan

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Kayoko Matsumoto

Kayoko Matsumoto

Osaka Red Cross Blood Center, Joto-ku, Osaka, Japan

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Hirokazu Inoue

Hirokazu Inoue

Department of Microbiology, School of Medicine, Shiga University of Medical Science, Tsukiwa-cho, Seta, Ohtsu, Japan

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Akihiro Watari

Akihiro Watari

Division of Cancer and Developmental Biology, Research Institute for Microbial Diseases, Osaka University, Suita, Japan

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Shinji Higashiyama

Shinji Higashiyama

Division of Cancer and Developmental Biology, Research Institute for Microbial Diseases, Osaka University, Suita, Japan

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Masuo Yutsudo

Masuo Yutsudo

Division of Cancer and Developmental Biology, Research Institute for Microbial Diseases, Osaka University, Suita, Japan

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First published: 18 July 2006
Citations: 11

Abstract

Adult T-cell leukemia/lymphoma (ATLL) is an aggressive form of human leukemia/lymphoma. Although this disease is initiated by infection with human T-lymphotropic virus type 1 (HTLV-1), many HTLV-1 carriers survive for a long period without aggressive illness, suggesting that other factors may play roles in the progression of ATLL to an aggressive state. However, the mechanism involved in this progression still remains unclear. Previously, we have reported that ASY/Nogo mRNA was markedly down-regulated in human small-cell lung carcinomas, whereas it was expressed in normal tissues and other lung carcinomas, such as adenocarcinoma and squamous cell carcinoma. To understand whether or not ASY/Nogo gene is involved in the progression of ATLL, we examined the expression of ASY/Nogo mRNA in smoldering, chronic and aggressive ATLL, and found that the expression level of ASY/Nogo mRNA was markedly reduced in clinically aggressive ATLL. HTLV-1 Tax expression was not affected by the down-regulation of ASY/Nogo mRNA. These results indicate that the ASY/Nogo gene may act as a suppressor against ATLL progression, independent of Tax expression. © 2006 Wiley-Liss, Inc.

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