Hormones and the immunological capacity. III. The immunodeficiency disease of the hypopituitary Snell-Bogg dwarf mouse

The naturally occurring immunodeficiency syndrome of the hypopituitary Snell-Bagg dwarf mice has been characterized. The immunopathological aspects of this syndrome derive primarily from an arrested ontogenetic development of the thymus. The alteration of the thymus function is caused by the failure of the pituitary to produce certain hormones, especially somatotropic hormone. The relation of this syndrome of the dwarf mouse to human immunodeficiency diseases and endocrinopathies is discussed

Hormones and the immunological capacity. IV. Restorative effects of developmental hormones or of lymphocytes on the immunodeficiency syndrome of the dwarf mouse

The restorative action of developmental hormones, mainly somatotropic hormone, and of lymphnode lymphocytes on the immunologically crippled hypopituitary Snell-Bagg dwarf mouse is evaluated. The hormonal treatment can completely reconstitute the structure of the thymus and of the peripheral lymphoid tissues. Both hormones and mature lymphocytes restore the impaired capacity of the dwarf mouse to propuce antibody and to reject skin allografts. Normal donor thymocytes and bone marrow cells alone or in combination fail to produce the same effect in absence of a hormonal treatment. The action of hormones is not exerted if dwarf mice are thymectomized in adult age. This and other evidence shows that the action of hormones is mediated through the thymus and leads to the formation of long-living lymphocytes

Hormones and immunological capacity: II. Reconstitution of antibody production in hormonally deficient mice by somatotropic hormone, thyrotropic hormone and thyroxin

Hypopituitary dwarf mice are immunologically deficient. This deficiency can be overcome by injection of somatotropic hormone and thyroxin. Antibody formation in hormonally reconstituted mice as measured by the number of plaque-forming cells against sheep erythrocytes equals or surpasses that of normal mice. The number of nucleated spleen cells is increased in both normal and dward mice after treatment with hormones. The hypotrophic thymus and peripheral lymphoid tissue of dwarf mice can be reconstituted to normal by treatment with somatotropic hormone and thyroxin. Anti-somatotropic hormone and anti-thyrotropic hormone antisera produce suppression of antibody formation. These effects can be reversed by somatotropic hormone and thyrotropic hormone. The anti-hormone antisera produce an involution of thymus and other lymphatic organs. A parallelism exists between involution of the lymphoid tissue, neutralization of circulating somatotropic hormone and depression of antibody production. These results stress the importance of the thymus—hypophysis relationship for cell differentiation with particular reference to the maturation of the immunological capacity