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Infect. Immun., 05 1996, 1516-1525, Vol 64, No. 5
N Okahashi, M Yamamoto, JL Vancott, SN Chatfield, M Roberts, H Bluethmann, T Hiroi, H Kiyono and JR McGhee
Mucosal immunoglobulin A (IgA) responses are often associated with Th2-
type cells and derived cytokines, and interleukin-4 (IL-4) knockout (IL-
4-/-) mice with impaired Th2 cells respond poorly to oral antigens.
However, we have noted that IL-4-/- mice have normal mucosal IgA levels,
which led us to query whether different oral delivery systems could elicit
mucosal immunity. Two oral regimens were used: (i) a live recombinant
Salmonella strain which expresses fragment C (ToxC) of tetanus toxin, and
(ii) soluble tetanus toxoid (TT) with cholera toxin (CT) as an adjuvant.
Oral immunization of IL-4-/- mice with recombinant Salmonella vaccine
expressing ToxC induced brisk mucosal IgA and serum IgG (mainly IgG2a)
anti-TT antibody responses. TT-specific CD4+ T cells from spleen or Peyer's
patches produced gamma interferon, indicative of Th1 responses; however,
IL-6 and IL-10 were also seen. Oral immunization of IL-4-/- mice with TT
and CT induced weak mucosal IgA to TT; however, brisk IgA anti-CT-B
responses and CT-B-specific CD4+ T cells producing IL-6 and IL-10 were also
noted. These results show that although IL-4-dependent antibody responses
are impaired, mucosal IgA responses are induced in IL-4-/- mice. These
result suggest that certain cytokines, i.e., IL-6 and IL-10 from Th2-type
cells, play an important compensatory role in the induction and regulation
of mucosal IgA responses.
Copyright © 1996, American Society for Microbiology
Oral immunization of interleukin-4 (IL-4) knockout mice with a recombinant Salmonella strain or cholera toxin reveals that CD4+ Th2 cells producing IL-6 and IL-10 are associated with mucosal immunoglobulin A responses
Mucosal Immunization Research Group, University of Alabama, Birmingham Medical Center 35294, USA.
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