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. 1994 Dec;83(4):562–567.

Failure of SCID mice to generate an oral tolerogen after a feed of ovalbumin: a role for a functioning gut-associated lymphoid system.

E Furrie 1, M W Turner 1, S Strobel 1
PMCID: PMC1415066  PMID: 7875736

Abstract

The role of the mucosal immune system in the generation of circulating tolerogenic ovalbumin (OVA) moieties has been investigated after a single feed of the protein. Serum collected from SCID mice 1 hr after a 25-mg feed of OVA was unable to transfer tolerance of delayed-type hypersensitivity (DTH) into naive BALB/c recipients. This is in contrast to serum collected from BALB/c mice which was able to transfer DTH tolerance to naive BALB/c recipients. The levels of circulating OVA detected in the serum of SCID mice 60 min after feeding OVA were approximately half those detected in the serum of BALB/c mice at the same time-point. However even dose adjustment of SCID mouse serum to a level of immunoreactive OVA equivalent to that found in BALB/c serum was unable to induce DTH tolerance in BALB/c recipients. This failure of SCID serum to transfer tolerance was shown to be unrelated to the germ-free conditions under which SCID mice are kept. Serum from OVA-fed germ-free BALB/c mice transferred DTH tolerance at equivalent levels to serum from conventionally reared BALB/c mice. When the intestinal morphology and intraepithelial lymphocyte (IEL) numbers in the duodenum of SCID mice were compared to conventionally reared and germ-free BALB/c controls, SCID mice were characterized by a lower number of IEL with a different morphology from the majority of IEL found in BALB/c mice.

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Selected References

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