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. 1981 Jan 1;153(1):61–74. doi: 10.1084/jem.153.1.61

Genetic resistance to the induction of experimental allergic encephalomyelitis in Lewis rats. I. Genetic analysis of an apparent mutant strain with phenotypic resistance to experimental allergic encephalomyelitis

PMCID: PMC2186047  PMID: 6161206

Abstract

Clinical resistance to the induction of experimental allergic encephalomyelitis was observed in a closed colony of Lewis (designated Le-R) rats. Disease susceptibility in randomly bred animals appeared to increase with increasing age. In the small group of young Le-R rats, which were susceptible, disease onset was delayed, severity of symptoms was reduced, and duration of clinical signs was abbreviated compared to conventional Lewis rats. The severity of histologic neural tissue lesions correlated with clinical observations. Breeding experiments indicated that most Le-R rats were resistant to disease induction regardless of whether their ancestors had been selected for susceptibility or resistance. The F3 generation of resistant lineage was uniformly resistant at all ages tested. Virtually all (Lewis X Le- R)F1 rats of either sex were resistant when challenged at 7-8 wk of age indicating that resistance was a dominant autosomal trait. Approximately half of (F1 X Lewis) backcross rats developed paralytic EAE whereas one-fourth were entirely resistant, suggesting that disease resistance may be mediated by one or two genes. Le-R rats shared at least some of the Lewis rat major histocompatibility antigens. Resistance apparently did not reflect a nonspecific impairment of cellular immune responsiveness. Le-R rats, which had been challenged with myelin basic protein, developed antigen-reactive cells specific for basic protein or its encephalitogenic fragment. Spleen cells obtained from basic protein-sensitized Le-R rats did not adoptively transfer disease into Lewis rats. In contrast, spleen cells obtained from basic protein-sensitized Lewis rats readily transferred disease into both Lewis and Le-R recipients. These data suggest that disease resistance may be a result of an immunologic deficit (or suppressor cell activity) expressed during the differentiation of antigen-reactive cells into disease-inducing effector cells.

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Selected References

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