Abstract
Thymic epithelial cell cultures from newborn CBA/J mice were developed and grown on collagen-coated dextran beads. These thymic epithelial cells were transplanted subcutaneously into aged syngeneic mice. After several weeks, enhanced
in vitro migration of host bone marrow cells occurred to supernatants prepared from neonatal thymus cultures in thymic epithelial cell grafted mice compared to control aged mice. Percent migration equaled that of migration from control young adult mice. In addition, enhanced T-lymphocyte responses were observed in aged mice given thymic epithelial cell grafts as compared to aged controls.
