PMID: 8955035Dec 15, 1996Paper

HTLV-1 gene expression in adult T-cell leukemia cells elicits an NK cell response in vitro and correlates with cell rejection in SCID mice

Virology
S A StewartI S Chen

Abstract

Human T-cell leukemia virus type 1 (HTLV-1) is the etiologic agent of adult T-cell leukemia (ATL). We have previously shown that the ATL cell line, RV-ATL, formed tumors when inoculated into severe combined immunodeficient (SCID) mice. In contrast, the HTLV-1 in vitro-transformed cell line, SLB-1, was nontumorigenic in SCID mice. ATL cells contain HTLV-1 proviral DNA sequences but lack detectable viral gene expression, in contrast to HTLV-1 in vitro-transformed cells, which express all viral gene products. We investigated the role of HTLV-1 gene expression in tumorigenesis by superinfecting RV-ATL cells with HTLV-1. The resulting cell line, HT-1RV, expressed HTLV-1. Injection of HT-1RV cells into SCID mice resulted in a reduced tumorigenic phenotype compared to the parental RV-ATL cells. In vitro natural killer (NK) cell cytotoxicity assays revealed that cell lines expressing HTLV-1 gene products, SLB-1 and HT-1RV, were sensitive to NK cell cytolysis. In contrast, nonexpressing RV-ATL cells were resistant to NK cell cytolysis. These studies indicate that lack of viral gene expression allows HTLV-1-infected cells to elude detection by murine NK cells and increases tumorigenicity in SCID mice. Thus the loss of HTLV-1 gene express...Continue Reading

Citations

Nov 18, 2000·AIDS Research and Human Retroviruses·M KannagiT Yoshiki
May 26, 2004·AIDS Research and Human Retroviruses·Therese M McGinnPatricia N Fultz
Oct 14, 2011·Viruses·Chloé Journo, Renaud Mahieux
Apr 11, 2012·American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons·T YoshizumiY Maehara
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