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Studies have shown a strong inverse relationship between atopy and geohelminth infection, indicating that atopy may protect against geohelminth infection. Resistance to ascariasis in atopic individuals may occur through greater immunoglobulin E-mediated responses and expression of T helper cell type 2 (Th2) cytokines to parasite antigens. To investigate the effect that atopy has on the immune response to Ascaris antigens, school-age children were recruited from rural schools in Ecuador. Immunologic variables were compared between children stratified by atopic and/or A. lumbricoides-infection status; the variables included cytokine expression by peripheral-blood mononuclear cells (PBMCs) and histamine release in response to Ascaris antigens. Atopic children had both greater frequencies of PBMCs expressing interleukin (IL)-4 and IL-5 and enhanced histamine release, compared with those in nonatopic children. Stratification by atopic and A. lumbricoides-infection status revealed the greatest histamine and Th2 cytokine responses in the stratum of atopic, noninfected children. Multivariate regression analyses showed significant effects for atopic status but not for infection status on Th2 cytokine expression and histamine release.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Atopic Phenotype Is an Important Determinant of Immunoglobulin E–Mediated Inflammation and Expression of T Helper Cell Type 2 Cytokines to<i>Ascaris</i>Antigens in Children Exposed to Ascariasis

Atopic Phenotype Is an Important Determinant of Immunoglobulin E–Mediated Inflammation and Expression of T Helper Cell Type 2 Cytokines toAscarisAntigens in Children Exposed to Ascariasis