Disclosed are compositions comprising an Fc portion of IgE coupled to an agent. For example, disclosed are compositions comprising an Fc portion of IgE coupled to an antigen or immunotherapeutic. These compositions can be used as a vaccine or an immunotherapeutic. Thus, these compositions can modulate the immune system by both increasing and decreasing the immune response. The Fc portion of IgE can bind to CD23 and transport the antigen or immunotherapeutic across airway epithelial cells. Disclosed are methods of treating airway inflammation with compositions comprising an Fc portion of IgE coupled to an antigen or immunotherapeutic.
