title: Readministration of adenovirus vector in nonhuman primate lungs by blockade of CD40-CD40 ligand interactions.
abstract: The interaction between CD40 on B cells and CD40 ligand (CD40L) on activated T cells is important for B-cell differentiation in T-cell-dependent humoral responses. We have extended our previous murine studies of CD40-CD40L in adenoviral vector-mediated immune responses to rhesus monkeys. Primary immune responses to adenoviral vectors and the ability to readminister vector were studied in rhesus monkeys in the presence or absence of a transient treatment with a humanized anti-CD40 ligand antibody (hu5C8). Adult animals were treated with hu5C8 at the time vector was instilled into the lung. Immunological analyses demonstrated suppression of adenovirus-induced lymphoproliferation and cytokine responses (interleukin-2 [IL-2], gamma interferon, IL-4, and IL-10) in hu5C8-treated animals. Animals treated with hu5C8 secreted adenovirus-specific immunoglobulin M (IgM) levels comparable to control animals, but did not secrete IgA or develop neutralizing antibodies; consequently, the animals could be readministered with adenovirus vector expressing alkaline phosphatase. A second study was designed to examine the long-term effects on immune functions of a short course of hu5C8. Acute hu5C8 treatment resulted in significant and prolonged inhibition of the adenovirus-specific humoral response well beyond the time hu5C8 effects were no longer significant. These studies demonstrate the potential of hu5C8 as an immunomodulatory regimen to enable administration of adenoviral vectors, and they advocate testing this model in humans.
authors.affiliation: Institute for Human Gene Therapy, Department of Molecular and Cellular Engineering, University of Pennsylvania, and The Wistar Institute, Philadelphia, Pennsylvania 19104, USA.
authors.forename: N
authors.initials: N
authors.lastname: Chirmule
authors.forename: S E
authors.initials: SE
authors.lastname: Raper
authors.forename: L
authors.initials: L
authors.lastname: Burkly
authors.forename: D
authors.initials: D
authors.lastname: Thomas
authors.forename: J
authors.initials: J
authors.lastname: Tazelaar
authors.forename: J V
authors.initials: JV
authors.lastname: Hughes
authors.forename: J M
authors.initials: JM
authors.lastname: Wilson
mesh_terms: D000256:Adenoviridae / Q000235:genetics*; D000818:Animals; D000911:Antibodies, Monoclonal / Q000627:therapeutic use; D000917:Antibody Formation; D019013:CD40 Antigens / Q000378:metabolism*; D023201:CD40 Ligand; D019005:Cystic Fibrosis Transmembrane Conductance Regulator / Q000235:genetics; D015316:Genetic Therapy; D005822:Genetic Vectors; D007111:Immunity, Cellular; D008168:Lung / Q000821:virology*; D008253:Macaca mulatta; D008562:Membrane Glycoproteins / Q000378:metabolism*
chemical_list: D000911:Antibodies, Monoclonal; D019013:CD40 Antigens; D008562:Membrane Glycoproteins; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; D023201:CD40 Ligand