MANIPULATION OF INTESTINAL IMMUNE-RESPONSES AGAINST OVALBUMIN BY CHOLERA-TOXIN AND ITS B-SUBUNIT IN MICE

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作者
VANDERHEIJDEN, PJ
BIANCHI, ATJ
DOL, M
PALS, JW
STOK, W
BOKHOUT, BA
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R392 [医学免疫学]; Q939.91 [免疫学];
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100102 ;
摘要
We studied the effect of mucosal presentation of ovalbumin (OVA) conjugated to cholera toxin (CT) or cholera toxin B subunit (CTB) on the intestinal immune responses against OVA. Mice were primed intraperitoneally (i.p.) with OVA in a water-in-oil emulsions and boosted intraduodenally (i.d.) with OVA conjugated to CT or CTB in various molar ratios. Responses were evaluated by testing intestinal secretions for OVA-specific antibodies and by quantifying the OVA-specific antibody secreting cells (ASC) in the lamina propria of the small intestine. OVA-CT conjugates were tested in a molar ratio ranging from 1.8:1 to 4500:1. OVA-CTB conjugates were tested in a molar ratio ranging from 0.25:1 to 500:1. The optimum intestinal immune response was reached at a molar ratio of 1.8:1 for OVA-CT and 5:1 for OVA-CTB. The binding capacity of OVA-CTB, but not of OVA-CT, to GM1 ganglioside corresponded with the capacity to enhance the intestinal immune response. The effect of conjugating CTB or CT to OVA on the immune response against OVA was more striking when mice were not only boosted i.d., but also primed i.d. Both OVA-CT and OVA-CTB induced detectable immune responses, whereas free OVA did not. Therefore, the carrier effect of CT or CTB is essential to trigger a mucosal immune response against OVA when presented mucosally only. We conclude that enhancing antigen uptake greatly facilitates mucosal immune responses.
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页码:89 / 93
页数:5
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