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Systemic immunization can elicit a significant response of IgG producing activated B cell subsets in human blood, part of which is not toward the vaccine. However, the effect of vaccination on IgA antibody secreting B cell subsets has had limited investigation. We immunized healthy, adult volunteers with a tetanus/diphtheria vaccine and observed a significant burst of IgA-secreting pre-plasma cells...
Venezuelan equine encephalitis virus replicon particles (VRP) function as an effective systemic, cellular and mucosal adjuvant when codelivered with antigen, and show promise for use as a component in new and existing human vaccine formulations. We show here that VRP are effective at low dose and by intramuscular delivery, two useful features for implementation of VRP as a vaccine adjuvant. In mice...
The chemokine, lymphotactin (LTN), was tested as a molecular adjuvant using bicistronic DNA vaccines encoding the protective Yersinia capsular (F1) antigen and virulence antigen (V-Ag) as a F1-V fusion protein. The LTN-encoding F1-V or V-Ag vaccines were given by the intranasal (i.n.) or intramuscular (i.m.) routes, and although serum IgG and mucosal IgA antibodies (Abs) were induced, F1-Ag boosts...
Assessment of immune responses induced by mucosal vaccines is to a large extent based on measurement of IgA levels in mucosal secretions and detection of short-lived effector IgA-secreting cells circulating in peripheral blood. Since these immunological parameters poorly reflect long-term IgA-mediated responses, we sought to investigate novel approaches that would enable detection of vaccine specific...
Immunoglobulin A (IgA), the most abundant Ig isotype in the body under steady-state conditions, helps to protect the body from mucosally transmitted pathogens and to maintain the homeostasis of commensal bacteria at the mucosal surface. Although it is well known that IgA is predominantly produced in mucosa-associated lymphoid tissues (MALT), little is known about why IgA class switch recombination...
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