Journal of Experimental Medicine, Vol 145, 772-777, Copyright © 1977 by Rockefeller University Press
Transplacental influence of the thymus
P McCullagh
Department of Immunology, John Curtin School of Medical Research, Australian National University, Canberra.
Peripheral blood lymphocyte levels attained in adult rats that had been
thymectomized at birth were markedly reduced if the two or three
immediately preceding generations of rats from which they were bred had
been thymectomized as neonates. The capacity of thymectomized animals to
survive to adult life was also drastically reduced if they were bred from
thymectomized stock. Pregnancy as a result of mating with syngeneic or
allogeneic males produced an ephemeral increase in peripheral blood
lymphocyte levels of third and fourth generation thymectomized females.
These observations are most readily explicable on the basis of a
thymus-derived humoral influence acting directly or indirectly to influence
the circulating lymphocyte population.