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  • Title: Development of antibody isotype responses to Schistosoma mansoni in an immunologically naive immigrant population: influence of infection duration, infection intensity, and host age.
    Author: Naus CW, Kimani G, Ouma JH, Fulford AJ, Webster M, van Dam GJ, Deelder AM, Butterworth AE, Dunne DW.
    Journal: Infect Immun; 1999 Jul; 67(7):3444-51. PubMed ID: 10377125.
    Abstract:
    We have identified the influence of host and parasite factors that give rise to characteristic antibody isotype profiles with age seen in human populations living in different areas of schistosomiasis endemicity. This is important in the immunobiology of this disease. It is also of interest in the context of human responses to chronic antigen stimulation, vaccines, allergens, and other pathogens. In populations exposed to endemic schistosomiasis, factors such as intensity and duration of infection are age dependent. They therefore confound the influence of host age on antiparasite responses. Here, we resolved these confounding factors by comparing the developing antibody responses of an immunologically naive immigrant population as they acquired the infection for the first time with those of chronically infected resident inhabitants of the same region of Schistosoma mansoni endemicity in Kenya. Recent arrival in the area strongly favored immunoglobulin G3 (IgG3) responses against the parasite. The antibody isotype responses associated with human susceptibility to reinfection after chemotherapy were elevated in those suffering high intensities of infection (IgG4 responses against worm and egg antigens) or were characteristic responses of young children irrespective of the intensity or duration of infection (IgG2 responses against egg antigen). IgE responses against the adult worm, a response associated with resistance to reinfection after chemotherapy, increased with the ages of infected individuals and were also favored in those currently suffering higher intensities of infection. This paper examines the influence of infection duration, infection intensity, and host age on specific antibody responses to Schistosoma mansoni in Masongaleni, Kenya. The serum levels of a circulating worm antigen, circulating anodic antigen, were measured to obtain accurate estimates of intensities of infection synchronous with antibody isotype levels measured in the same sera. Recent arrival in the area strongly favored immunoglobulin G3 (IgG3) responses against the parasites. The antibody isotype responses associated with human susceptibility to reinfection after chemotherapy were elevated in those suffering high intensities of infection (IgG4 responses against worm and egg antigens) or were characteristic responses of young children irrespective of the intensity or duration of infection (IgG2 responses against egg antigen). IgE responses against the adult worm increased with age of infected individuals and were also favored in currently suffering higher intensities of infection. In summary, specific IgG1 and IgG4 responses against worm antigen, as well as IgG4 responses against egg antigen, were strongly associated with intensity of infection, while specific IgG1 and IgG2 responses against egg antigen decreased with age. Finally, IgG3 responses were related to duration of exposure and showed no association with either infection intensity or age.
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