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. 1990 Nov;87(22):8746–8750. doi: 10.1073/pnas.87.22.8746

Selective induction of toxicity to human cells expressing human immunodeficiency virus type 1 Tat by a conditionally cytotoxic adenovirus vector.

L K Venkatesh 1, M Q Arens 1, T Subramanian 1, G Chinnadurai 1
PMCID: PMC55036  PMID: 2247444

Abstract

The human immunodeficiency viruses (HIVs) primarily infect CD4+ T lymphocytes, leading eventually to the development of a systemic immune dysfunction termed acquired immunodeficiency syndrome (AIDS). An attractive strategy to combat HIV-mediated pathogenesis would be to eliminate the initial pool of infected cells and thus prevent disease progression. We have engineered a replication-defective, conditionally cytotoxic adenovirus vector, Ad-tk, whose action is dependent on the targeted expression of the herpes simplex virus type 1 thymidine kinase gene (tk), cloned downstream of the HIV-1 long terminal repeat, in human cells expressing the HIV-1 transcriptional activator Tat. Infection of Tat-expressing human HeLa or Jurkat cells with Ad-tk resulted in high-level tk expression, which was not deleterious to the viability of these cells. However, in the presence of the antiherpetic nucleoside analog ganciclovir, Ad-tk infection resulted in a massive reduction in the viability of these Tat-expressing cell lines. As adenoviruses are natural passengers of the human lymphoid system, our results suggest adenovirus vector-based strategies for the targeted expression, under the control of cis-responsive HIV regulatory elements, of cytotoxic agents in HIV-infected cells for the therapy of HIV-mediated pathogenesis.

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Selected References

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