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. 1980 Jul;41(1):63–72.

Age- and sex-dependent thymic abnormalities in NZB × SJL F1 hybrid mice

F Dumont, F Robert
PMCID: PMC1536912  PMID: 7438550

Abstract

The cellular organization of the thymus was investigated in 3- and 12-month-old NZB × SJL F1 hybrid (NS) mice. Age-dependent alterations were demonstrated which differed strikingly according to the sex of the animals. In female mice, marked abnormalities of the thymus developed during ageing. They consisted of a more or less pronounced hypertrophy accompanied by histological changes and modifications in the nature of the lymphocyte populations. Three types of qualitative changes were found at 12 months of age: (1) depletion of cortical thymocytes as evidenced by histology, by the evaluation of peanut-agglutinin (PNA) binding and by cell electrophoresis; (2) hyperplasia of the medullary lymphoid tissue, probably reflecting the expansion of a population of mature T lymphocytes. This was further suggested by a rise (up to 60%) in the frequency of lymphocytes lacking both PNA receptor and B cell markers, by an increased proportion (57%) of high electrophoretic mobility (EPM) lymphocytes and by an augmentation of in vitro reactivities to phytohaemagglutinin (PHA) and, although to a lesser extent, to concanavalin A (Con A). (3) The appearance of significant numbers of B lymphocytes (up to 20%) as assessed by surface immunoglobulin (sIg) and complement receptor (CR) detection which was accompanied by a vigorous responsiveness of thymus cells to lipopolysaccharide (LPS). None of these abnormalities was seen in the male mice. Instead, the thymus of NS males displayed a nearly normal age-related involution without major change in the proportions of its lymphocyte subpopulations. NS mice thus provide an interesting model of thymic disease influenced by sex-linked factors.

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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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