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American Journal of Pathology, Vol 138, 1015-1025, Copyright © 1991 by American Society for Investigative Pathology

REGULAR ARTICLES

Traffic of peripheral B and T lymphocytes to hyperplastic, preneoplastic thymuses of AKR mice

SA Michie and RV Rouse
Department of Pathology, Stanford University Medical Center, California 94305.

AKR mice develop hyperplasia of the thymus before the development of retrovirus-associated lymphoma at that site. This hyperplasia, first detectable in AKR/J mice by 4 weeks of age and in AKR/C mice by 4 to 5 months of age, is characterized by an enlarged thymic medulla that contains T and B lymphocytes. In contrast to the general population of thymocytes, most of these T and B lymphocytes have a mature immunophenotype that includes expression of high levels of the MEL-14- defined (gp90) 'homing receptor' for peripheral lymph node high endothelial venules. In vivo homing studies reveal a marked increase in traffic of peripheral lymphocytes (T more than B) to the hyperplastic thymuses of old AKR mice as compared to histologically normal thymuses of age-matched BALB/c and C57BL/Ka mice or young AKR mice. These changes correlate chronologically with changes in retrovirus antigen expression in AKR thymuses and suggest a role for the traffic of lymphocytes from the periphery to the thymus in response to local antigenic stimulation in the pathogenesis of thymic hyperplasia in AKR mice.


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Copyright © 1991 by the American Society for Investigative Pathology.