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. 1981 Jun 1;153(6):1405–1414. doi: 10.1084/jem.153.6.1405

Influence of thymic genotype on the systemic lupus erythematosus-like disease and T cell proliferation of MRL/Mp-lpr/lpr mice

PMCID: PMC2186176  PMID: 6972998

Abstract

In young adulthood, MRL/Mp-lpr/lpr mice develop severe systemic lupus erythematosus (SLE)-like syndrome associated with massive T cell proliferation. The congenic MRL/Mp- mice lack the lpr gene and develop chronic SLE late in life. We have exchanged thymic transplants between these substrains so as to determine the role of the thymus in the development of early, severe SLE and of lymphoproliferation. The median survival times of unmanipulated lpr/lpr and mice were 160 and 510 d, respectively. The lpr/lpr and mice thymectomized when newborn and transplanted at 1 mo with the opposite type of thymus retained the diseases phenotype of their unmanipulated counterparts with 50% mortality at 186 and 498 d, respectively. In contrast, lpr/lpr mice thymectomized when newborn but not transplanted with thymus did not develop lymphoid hyperplasia and glomerulonephritis, and 100% of them were alive at 390 d. Serologically, the thymectomized but untransplanted lpr/lpr mice had significantly reduced levels of autoantibodies, whereas thymectomized and transplanted mice of either substrain were similar to unmanipulated controls. The results indicate that: (a) a thymus is essential for expression of lymphoproliferation and early SLE-like disease in the lpr/lpr phenotype; (b) the lpr/lpr disease is not a result of a unique hormonal or microenvironmental defect(s) of the thymus of this substrain because the genotype of the thymus is irrelevant for the development of T cell proliferation and early SLE; (c) differentiation of stem cells under the hormonal or microenvironmental influences of a thymus that possesses the lpr genotype does not lead to abnormal T cell differentiation or early autoimmunity; and (d) the lpr/lpr disease cannot be caused exclusively by an intrinsic B cell defect or environmental stimuli that cause B cell polyclonal activation.

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Selected References

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