Volume 53, Issue 11 pp. 621-628
Free Access

Archetype JC virus efficiently propagates in kidney-derived cells stably expressing HIV-1 Tat

Souichi Nukuzuma

Souichi Nukuzuma

Department of Microbiology, Kobe Institute of Health, 4-6, Minatojima-Nakamachi, Chuo-ku, Kobe, Hyogo 650-0046

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Masanori Kameoka

Corresponding Author

Masanori Kameoka

Department of Biochemistry

†Present address: Thailand-Japan Research Collaboration Center on Emerging and Re-emerging Infections (RCC-ERI), Research Institute for Microbial Diseases, Osaka University, Nonthaburi 11000, Thailand.

Correspondence
Souichi Nukuzuma, Department of Microbiology, Kobe Institute of Health, 4-6, Minatojima-Nakamachi, Chuo-ku, Kobe, Hyogo 650-0046, Japan.
Tel: +81 78 302 6256; fax: +81 78 302 0894; email: [email protected]

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Shigeki Sugiura

Shigeki Sugiura

Medical Genetics Research Center, Nara Medical University, Kashihara, Nara 634-8521

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Kazuo Nakamichi

Kazuo Nakamichi

Department of Virology 1, National Institute of Infectious Diseases, Toyama, Shinjuku, Tokyo 162-8640

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Chiyoko Nukuzuma

Chiyoko Nukuzuma

Department of Microbiology, Kobe Institute of Health, 4-6, Minatojima-Nakamachi, Chuo-ku, Kobe, Hyogo 650-0046

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Isao Miyoshi

Isao Miyoshi

Department of Medicine, Kochi Medical School, Kohasu, Oko-cho, Nankoku, Kochi 783-8505

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Tsutomu Takegami

Tsutomu Takegami

Division of Molecular Oncology and Virology, Medical Research Institute, Kanazawa Medical University, Ishikawa 920-0293, Japan

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First published: 23 October 2009
Citations: 12

ABSTRACT

Pathogenic JCV with rearranged regulatory regions (PML-type) causes PML, a demyelinating disease, in the brains of immunocompromised patients. On the other hand, archetype JCV persistently infecting the kidney is thought to be converted to PML-type virus during JCV replication in the infected host under immunosuppressed conditions. In addition, Tat protein, encoded by HIV-1, markedly enhances the expression of a reporter gene under control of the JCV late promoter.

In order to examine the influence of Tat on JCV propagation, we used kidney-derived COS-7 cells, which only permit archetype JCV, and established COS-tat cells, which express HIV-1 Tat stably. We found that the extent of archetype JCV propagation in COS-tat cells is significantly greater than in COS-7 cells. On the other hand, COS-7 cells express SV40 T antigen, which is a strong stimulator of archetype JCV replication. The expression of SV40 T antigen was enhanced by HIV-1 Tat slightly according to real-time RT-PCR, this was not closely related to JCV replication in COS-tat cells. The efficiency of JCV propagation depended on the extent of expression of functional Tat. To our knowledge, this is the first report of increased production of archetype JCV in a culture system using cell lines stably expressing HIV-1 Tat. We propose here that COS-tat cells are a useful tool for studying the role of Tat in archetype JCV replication in the development of PML.

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