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A monoclonal antibody Th-5 has been produced against mouse immature thymic lymphocytes and employed to study the process of T cell differentiation in the thymus. Immunohistologically, Th-5 positive thymic T lymphocytes were first found at Day 12 of gestation. They increased in number as well as staining intensity until Day 18 of gestation and decreased thereafter. Th-5 antigen expression was not seen in lymphoid cells in the fetal liver. In the newborn thymus, lymphocytes in the subcapsular layer were still strongly positive, while other cortical lymphocytes became moderately positive for Th-5. Th-5 positiveness was more pronounced in the medulla than in the cortex in the thymus of young adult mice. The staining pattern of Th-5 in the thymus was apparently different from those with other T cell markers (Thy-1, CD3, CD4, CD5, CD8) including J11d, Pgp-1, IL-2R, and 3A10 (TCR gamma delta). Flow cytometric analyses showed that the expression of Th-5 was mostly associated with the Thy-1 antigen. However, the fluorescent intensity of Th-5 gradually declined with ontogenic development of the thymus, and the molecular size of the antigen was approximately 100 kDa, which is different from Thy-1 antigen (25-30 kDa). Considering these findings, the strong expression of Th-5 could be one of the markers of immature thymic T lymphocytes in the early phase of the ontogenic development.
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