Abstract
The lymphocyte composition of the thymus and spleen from weaned (4 month old) hypopituitary dwarf Snell-Bagg mice were compared to those of their phenotypically normal littermates and of hormone (somatotropic hormone plus thyroxine)-treated individuals. Detection of cells bearing receptors for peanut agglutinin, physical analysis and measurement of in vitro reactivities to phytohaemagglutinin and concanavae intra-thymic lymphocyte population of dwarf mice. Examination of spleen-cell suspensions demonstrated a slightly higher frequency of T lymphocytes (Thy 1-2+ alpha-Naphthyl esterase+, high electrophoretic mobility) and lower frequency of B lymphocytes (surface immunoglobulin+, low electrophoretic mobility) in dwarf mice than in control mice. The degree of splenocyte responsiveness to T- and B-cell mitogens, however was similar in the two mouse types. High mobility (T) splenic cells were found to exhibit a smaller modal volume in dwarf mice (110 micron3) than in control mice (122 micron3) but this difference was not corrected by hormone administration. More pronounced were the quantitative differences between the spleens of hormone-deficient and normal mice. Thus, when expressed as a function of body weight, the numbers of splenic T and B lymphocytes in untreated dwarf mice were about half the corresponding values in hormone-reconstituted or normal littermates. These data suggested that in adult life, developmental hormones exert little direct effect on the thymus lymphocytes but influence the size of the pool of both peripheral T and B lymphocytes.
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Selected References
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