title: CD8(+) T cells armed with retrovirally transduced IFN-gamma.
abstract: Interferon-gamma (IFN-gamma) is considered a key cytokine involved in the preventive and defensive responses of T cells against infectious pathogens and tumors. Therefore, the transgenic expression of IFN-gamma in specific T cells appears to be an obvious therapeutic possibility. To directly examine whether IFN-gamma production can be increased in T cells, we introduced an IFN-gamma encoding cDNA into IFN-gamma(-/-) and IFN-gamma(+/+) CD8(+) effector populations by retroviral transduction. Here, we show that CD8 T cells can be equipped with IFN-gamma that increases their capacity to secrete the cytokine. Despite constitutive retroviral IFN-gamma mRNA transcription, translation and secretion of IFN-gamma protein was tightly regulated and only observed in activated T cells. Neither proliferation nor cytolytic activity of CTL was affected by IFN-gamma transduction. Importantly, CD8(+) T cells retrovirally transduced with IFN-gamma exhibit augmented tumor suppressive capacity upon adoptive transfer into IFN-gamma(-/-) mice. Thus, T cells can be readily armed with IFN-gamma without risking immunopathology by dysregulated production of this highly potent proinflammatory cytokine.
authors.affiliation: Molecular Immunology, HZI, Helmholtz-Centre for Infection Research, Inhoffenstr. 7, 38124, Braunschweig, Germany. siegfried.weiss@helmholtz-hzi.de
authors.forename: Christian
authors.initials: C
authors.lastname: Becker
authors.forename: Stefan
authors.initials: S
authors.lastname: Lienenklaus
authors.forename: Jadwiga
authors.initials: J
authors.lastname: Jablonska
authors.forename: Heike
authors.initials: H
authors.lastname: Bauer
authors.forename: Siegfried
authors.initials: S
authors.lastname: Weiss
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D003110:Colonic Neoplasms / Q000276:immunology* / Q000628:therapy; D005786:Gene Expression Regulation / Q000502:physiology*; D005822:Genetic Vectors; D007371:Interferon-gamma / Q000235:genetics*; D018664:Interleukin-12 / Q000378:metabolism; D020382:Interleukin-18 / Q000378:metabolism; D008213:Lymphocyte Activation / Q000502:physiology; D051379:Mice; D008807:Mice, Inbred BALB C; D018345:Mice, Knockout; D008822:Mice, Transgenic; D012333:RNA, Messenger / Q000378:metabolism; D012190:Retroviridae / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015996:Survival Rate; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014161:Transduction, Genetic; D019076:Transgenes
chemical_list: D020382:Interleukin-18; D012333:RNA, Messenger; D018664:Interleukin-12; D007371:Interferon-gamma