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. 1986 Aug;58(4):677–683.

Divergent effects of bacterial lipopolysaccharide on immunity to orally administered protein and particulate antigens in mice.

A M Mowat, M J Thomas, S MacKenzie, D M Parrott
PMCID: PMC1453113  PMID: 3488267

Abstract

We have investigated whether bacterial lipopolysaccharide (LPS) influences immune responses to dietary protein antigens in experimental animals. Simultaneous intravenous administration of LPS to normal mice fed ovalbumin (OVA) prevented the induction of tolerance for serum IgG antibody responses but did not alter the tolerance of systemic delayed-type hypersensitivity (DTH). In addition, exogenous LPS did not enhance the ability of spleen accessory cells to present OVA to primed T cells. LPS-unresponsive C3H/HeJ mice developed full tolerance of both humoral and cell-mediated immunity after feeding a range of doses of OVA that was equal in degree and persistence to that seen in normal, congenic C3H/HeOla mice and also had normal antigen-presenting cell (APC) activity for OVA. In contrast, C3H/HeJ mice were primed by feeding SRBC instead of developing the systemic tolerance found in normal C3H mice. Our results indicate the complexity of mechanisms that may regulate systemic immunity to orally administered antigens of different forms. Nevertheless, LPS does not modulate DTH responses to fed OVA and does not enhance APC activity, and we conclude that bacterial LPS may be unable to influence hypersensitivity to dietary proteins in man.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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