title: Murine retroviral vector that induces long-term expression of HIV-1 envelope protein.
abstract: A retroviral vector was constructed that induces long-term expression of human immunodeficiency virus type 1 (HIV-1) rev, vpu and env genes. The vector contains the neo gene and a cytomegalovirus (CMV) immediate early promoter followed by HIV-1 sequence. When HeLa cells were infected with viral stocks derived from this vector, about 25% of the resulting G418-resistant clones expressed HIV-1 envelope protein (Env), easily detectable by Western blot analysis, metabolic labelling, and syncytium formation after co-cultivation with HeLa-CD4 cells. In most cases the level of Env expression was higher than in a T cell line (H9) chronically infected with HIV-1. Env-expressing HeLa cell lines also expressed Rev, detected by transfection with a Rev-dependent CAT gene construct, and Vpu, detected by immunoprecipitation with a Vpu-specific antiserum. The 75% of G418-resistant HeLa cell lines that did not express Env were found to contain proviruses that had undergone deletion of env sequences corresponding to a known intron; presumably these cell lines arose as a result of infection with virions derived from spliced RNAs. This vector should be useful for studying non-transient effects of HIV Env, Rev and Vpu in tissue culture, and for the production of Env- and/or Rev-expressing cell lines.
authors.affiliation: Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.
authors.forename: K
authors.initials: K
authors.lastname: Fujita
authors.forename: F
authors.initials: F
authors.lastname: Maldarelli
authors.forename: D F
authors.initials: DF
authors.lastname: Purcell
authors.forename: J
authors.initials: J
authors.lastname: Silver
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D018076:DNA, Complementary; D015870:Gene Expression; D018014:Gene Transfer Techniques; D005822:Genetic Vectors; D015700:HIV Envelope Protein gp41 / Q000096:biosynthesis* / Q000235:genetics; D006367:HeLa Cells; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D012190:Retroviridae / Q000235:genetics*
chemical_list: D018076:DNA, Complementary; D015700:HIV Envelope Protein gp41