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• W2015278614 abstract "This study assessed the mucosal and systemic immune responses following repetitive adenoviral vector instillation to the parotid glands. Also, we investigated the feasibility of oral tolerance induction as a rational strategy to overcome the immunological reactions. The replication-deficient recombinant adenovirus vector Ad-CMVCAT was instilled into rat parotid glands. Chloramphenicol acetyltransferase (CAT) activity in the parotid was observed after a first or second AdCMVCAT infection, but not after a third vector administration. ELISA assays showed increased anti-adenovirus immunoglobulin G (IgG) and IgM in serum, and also anti-adenovirus IgA in gland extracts and saliva after virus administration. The results of in vivo neutralization experiments demonstrated that salivary IgA and IgM prevented reinfection of the parotids with adenoviral vectors. Subsequently, studies were conducted to induce tolerance to adenovirus by peroral feedings of ultraviolet (UV)-inactivated virus before gene administration to the parotid glands. Between 3 and 13 doses of virus were fed to rats. Final parotid gene expression was dependent on the number of viral feedings and the amount fed. Tolerized animals showed prolonged and heightened gene expression in the salivary glands compared to control animals and displayed gene expression even after three administrations of vector. Mononuclear cells from the spleens of these animals showed reduced proliferation following adenovirus stimulation. This same cell population was depleted of CD8+ T cells and found to produce less interferon-γ (IFN-γ) after virus challenge. This profile indicates the down regulation of Th1 cell-mediated responses. These results indicate that oral tolerance induction is a potentially useful adjunct to virus-based gene therapy. Immune responses to adenoviral vectors represent a major limitation to their use in vivo, particularly when repeated administration is required. In rat parotid gland, gene expression was observed after a first or second virus instillation, but not after the third administration. Those animals showed elevated serum anti-adenovirus immunoglobulin G (IgG) and IgM levels and anti-adenovirus IgA level in saliva. Animals were fed inactivated vector to determine if immunological tolerance could be induced. The orally tolerized animals showed prolonged gene expression in the salivary glands compared to control animals, and could be infected at least three times. The immunological profile of these animals suggested a down-regulation of the Th1 cell-mediated response." @default.
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• W2015278614 date "1998-02-10" @default.
• W2015278614 modified "2023-09-25" @default.
• W2015278614 title "Repetitive Adenovirus Administration to the Parotid Gland: Role of Immunological Barriers and Induction of Oral Tolerance" @default.
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• W2015278614 doi "https://doi.org/10.1089/hum.1998.9.3-305" @default.
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