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MHC class I gene(s) in the D/L region but not the TNF-alpha gene determines development of toxoplasmic encephalitis in mice.

Y Suzuki, K Joh, O C Kwon, Q Yang, F K Conley and J S Remington
J Immunol November 15, 1994, 153 (10) 4649-4654;
Y Suzuki
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K Joh
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O C Kwon
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Q Yang
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F K Conley
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J S Remington
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Abstract

Previous studies revealed that mice with the b or k allele at the H-2D region are susceptible to toxoplasmic encephalitis (TE); those with the d allele are resistant. To determine whether the b or d allele is dominant, F1 hybrids between susceptible C57BL/6 (H-2b) and resistant BALB/c (H-2d) mice were infected with T. gondii. TE was not observed in the F1 hybrids, indicating that the d allele is dominant for protection against development of TE. Mice with a mutation in the D/L region were used to determine whether the D gene or the L gene of MHC class I Ags of the H-2D region is most critical for resistance against development of TE. B10.D2-H2dm1 (dm1) mice that have the mutant D/L hybrid gene formed by fusion of the 5' part of the Dd gene and the 3' part of the Ld gene developed TE in contrast to their background B10.D2 mice. BALB/c-H-2dm2 (dm2) mice, which have a complete deletion of the Ld gene, had significantly more T. gondii cysts in their brains than did dm1 mice and developed large areas of necrosis in their brains that were not observed in dm1 mice. These results indicate that a gene(s) in the D/L region determines whether TE will occur and that the Ld gene plays a critical role in the resistance against development of TE. Polymorphisms in the TNF-alpha gene (located in the H-2D region) have been reported to correlate with resistance against the development of TE. When development of TE was studied in BALB/c and dm2 mice that have the same TNF-alpha gene, only dm2 mice developed TE. This indicates that the TNF-alpha gene is not a determining factor for the development of TE. Transcripts for TNF-alpha were detected in brains of infected dm2 mice but not in BALB/c mice. Injection of neutralizing Abs against TNF-alpha resulted in worsening of the TE in infected dm2 mice but did not induce TE in infected BALB/c mice. Thus, TNF-alpha appears to be produced in the brain after TE has developed and is responsible for preventing the progression of TE.

  • Copyright © 1994 by American Association of Immunologists

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The Journal of Immunology
Vol. 153, Issue 10
15 Nov 1994
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MHC class I gene(s) in the D/L region but not the TNF-alpha gene determines development of toxoplasmic encephalitis in mice.
Y Suzuki, K Joh, O C Kwon, Q Yang, F K Conley, J S Remington
The Journal of Immunology November 15, 1994, 153 (10) 4649-4654;

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MHC class I gene(s) in the D/L region but not the TNF-alpha gene determines development of toxoplasmic encephalitis in mice.
Y Suzuki, K Joh, O C Kwon, Q Yang, F K Conley, J S Remington
The Journal of Immunology November 15, 1994, 153 (10) 4649-4654;
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Print ISSN 0022-1767        Online ISSN 1550-6606