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Transformation and Oncogenesis

Immortalization of CD4+ and CD8+ T Lymphocytes by Human T-Cell Leukemia Virus Type 1 Tax Mutants Expressed in a Functional Molecular Clone

Michael D. Robek, Lee Ratner
Michael D. Robek
Departments of Medicine, Pathology, and Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110
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Lee Ratner
Departments of Medicine, Pathology, and Molecular Microbiology, Washington University School of Medicine, St. Louis, Missouri 63110
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DOI: 10.1128/JVI.73.6.4856-4865.1999
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ABSTRACT

The human T-cell leukemia virus type 1 (HTLV-1) transcriptionaltrans-activator Tax has been demonstrated to have transforming activity in multiple cell culture and transgenic-mouse models. In addition to activating transcription from the viral long terminal repeat (LTR) through the cyclic AMP response element binding protein/activating transcription factor (CREB/ATF) family of transcription factors, Tax activates the expression of multiple cellular promoters through the NF-κB pathway of transcriptional activation. The Tax mutants M22 and M47 have previously been demonstrated to selectively abrogate the ability of Tax to activate transcription through the NF-κB or CREB/ATF pathway, respectively. These mutations were introduced in the tax gene of the ACH functional molecular clone of HTLV-1, and virus produced from the mutant ACH clones was examined for the ability to replicate and immortalize primary human lymphocytes. While virus derived from the clone containing the M47 mutation retained the ability to immortalize T lymphocytes, the M22 mutant lost the ability to immortalize infected cells. These results indicate that activation of the CREB/ATF pathway by Tax is dispensable for the immortalization of T cells by HTLV-1, whereas activation of the NF-κB pathway may be critical.

  • Copyright © 1999 American Society for Microbiology
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Immortalization of CD4+ and CD8+ T Lymphocytes by Human T-Cell Leukemia Virus Type 1 Tax Mutants Expressed in a Functional Molecular Clone
Michael D. Robek, Lee Ratner
Journal of Virology Jun 1999, 73 (6) 4856-4865; DOI: 10.1128/JVI.73.6.4856-4865.1999

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Immortalization of CD4+ and CD8+ T Lymphocytes by Human T-Cell Leukemia Virus Type 1 Tax Mutants Expressed in a Functional Molecular Clone
Michael D. Robek, Lee Ratner
Journal of Virology Jun 1999, 73 (6) 4856-4865; DOI: 10.1128/JVI.73.6.4856-4865.1999
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