title: Mass spectrometry reveals changes in MHC I antigen presentation after lentivector expression of a gene regulation system.
abstract: The rapamycin-inducible gene regulation system was designed to minimize immune reactions in man and may thus be suited for gene therapy. We assessed whether this system indeed induces no immune responses. The protein components of the regulation system were produced in the human cell lines HEK 293T, D407, and HER 911 following lentiviral transfer of the corresponding genes. Stable cell lines were established, and the peptides presented by major histocompatibility complex class I (MHC I) molecules on transduced and wild-type (wt) cells were compared by differential mass spectrometry. In all cell lines examined, expression of the transgenes resulted in prominent changes in the repertoire of MHC I-presented self-peptides. No MHC I ligands originating from the transgenic proteins were detected. In vitro analysis of immunogenicity revealed that transduced D407 cells displayed slightly higher capacity than wt controls to promote proliferation of cytotoxic T cells. These results indicate that therapeutic manipulations within the genome of target cells may affect pathways involved in the processing of peptide antigens and their presentation by MHC I. This makes the genomic modifications visible to the immune system which may recognize these events and respond. Ultimately, the findings call attention to a possible immune risk.Molecular Therapy - Nucleic Acids (2013) 2, e75; doi:10.1038/mtna.2013.3; published online 12 February 2013.
authors: 201;quipe Biotechnologie et Biothérapie, Centre de Recherche de l'Institut du Cerveau et de la Moelle Épinière, CNRS-UMR 7225, INSERM-UMRS 975 et Université Pierre et Marie Curie, Hôpital de la Pitié Salpêtrière, Paris, France.
authors: Roland
authors: R
authors: Vogel
authors: Reem
authors: R
authors: Al-Daccak
authors: Oliver
authors: O
authors: Drews
authors: Jessy
authors: J
authors: Alonzeau
authors: Gabor
authors: G
authors: Mester
authors: Dominique
authors: D
authors: Charron
authors: Stefan
authors: S
authors: Stevanovic
authors: Jacques
authors: J
authors: Mallet
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