Mechanisms for induction of acquired host immunity by neutrophil peptide defensins.

Human neutrophil peptide (HNP) defensins were studied to determine their potential effects on adaptive mucosal immunity. Intranasal delivery of HNPs plus ovalbumin (OVA) enhanced OVA-specific serum IgG antibody (Ab) responses. However, OVA-specific IgA Abs were not induced in mucosal secretions or in serum. CD4(+) T cells of intranasally immunized mice displayed higher OVA-specific proliferative responses and elevated production of interferon gamma, interleukin (IL) 5, IL-6, and IL-10 when compared with control groups receiving OVA alone. In vitro, HNPs also enhanced both proliferative responses and T helper (Th) cytokine secretion profiles of CD3epsilon-stimulated spleen- and Peyer's patch-derived naive CD4(+) T cells. HNPs modulated the expression of costimulatory molecules by lipopolysaccharide- or CD3epsilon-stimulated splenic and Peyer's patch B or T cell populations, respectively. These studies show that defensins enhance systemic IgG, but not IgA, Ab responses through help provided by CD4(+) Th1- and Th2-type cytokines and foster B and T cell interactions to link innate immunity with the adaptive immune system.

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