CD4+ T cell-independent DNA vaccination against opportunistic infections.

Academic Article


  • Depletion or dysfunction of CD4+ T lymphocytes profoundly perturbs host defenses and impairs immunogenicity of vaccines. Here, we show that plasmid DNA vaccination with a cassette encoding antigen (OVA) and a second cassette encoding full-length CD40 ligand (CD40L), a molecule expressed on activated CD4+ T lymphocytes and critical for T cell helper function, can elicit significant titers of antigen-specific immunoglobulins in serum and Tc1 CD8+ T cell responses in CD4-deficient mice. To investigate whether this approach leads to CD4+ T cell-independent vaccine protection against a prototypic AIDS-defining infection, Pneumocystis (PC) pneumonia, we used serum from mice vaccinated with PC-pulsed, CD40L-modified DCs to immunoprecipitate PC antigens. Kexin, a PC antigen identified by this approach, was used in a similar DNA vaccine strategy with or without CD40L. CD4-deficient mice receiving DNA vaccines encoding Kexin and CD40L showed significantly higher anti-PC IgG titers as well as opsonic killing of PC compared with those vaccinated with Kexin alone. Moreover, CD4-depleted, Kexin-vaccinated mice showed a 3-log greater protection in a PC challenge model. Adoptive transfer of CD19+ cells or IgG to SCID mice conferred protection against PC challenge, indicating a role of humoral immunity in the protection. The results of these studies show promise for CD4-independent vaccination against HIV-related or other opportunistic pathogens.
  • Published In


  • Adenoviridae, Animals, Antigens, Antigens, CD19, CD4-Positive T-Lymphocytes, CD40 Ligand, CD8-Positive T-Lymphocytes, Cancer Vaccines, DNA, Enzyme-Linked Immunosorbent Assay, Haplorhini, Immunoglobulin G, Immunoprecipitation, Interferon-gamma, Major Histocompatibility Complex, Male, Mice, Mice, Inbred BALB C, Mice, Inbred C57BL, Mice, SCID, Microscopy, Fluorescence, Models, Genetic, Opportunistic Infections, Plasmids, Pneumonia, Pneumocystis, Proprotein Convertases, Protein Structure, Tertiary, Proteomics, RNA, Saccharomyces cerevisiae Proteins, Spleen, T-Lymphocytes, Time Factors, Vaccines, DNA
  • Digital Object Identifier (doi)

    Author List

  • Zheng M; Ramsay AJ; Robichaux MB; Kliment C; Crowe C; Rapaka RR; Steele C; McAllister F; Shellito JE; Marrero L
  • Start Page

  • 3536
  • End Page

  • 3544
  • Volume

  • 115
  • Issue

  • 12