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The Journal of Immunology, Vol 154, Issue 5 2012-2022, Copyright © 1995 by American Association of Immunologists

ARTICLES

AD2, a human molecule involved in the interaction of T cells with epidermal keratinocytes and thymic epithelial cells

CS Bruggers, DD Patel, RM Scearce, LP Whichard, BF Haynes and KH Singer
Division of Hematology/Oncology, Department of Pediatrics, Duke University Medical Center, Durham, NC 27710.

Interactions between T cells and epithelial cells of the thymus are essential for normal T cell development, and interactions between T cells and skin epidermal keratinocytes occur in the context of inflammatory skin diseases and cutaneous T cell malignancies. On the basis of observations that the T cell ALL cell line, HSB, bound to IFN- gamma activated epidermal keratinocytes (41 +/- 5% of EK with three or more HSB cells bound), whereas the CTCL cell line H9 bound poorly (8 +/- 3%), we have raised mAb 13H12 that identified a 36 kDa molecule, termed AD2, that was highly expressed on HSB but not on H9 T cells. mAb 13H12 inhibited the binding of HSB T cells to IFN-gamma-treated epidermal keratinocytes (43 +/- 5% inhibition, p < 0.01), inhibited the binding of peripheral blood T cells to IFN-gamma-treated EK (62 +/- 3% inhibition, p < 0.001), and inhibited the binding of IFN-gamma-treated human thymic epithelial cells to thymocytes (39 +/- 3% inhibition, p < 0.01). Although AD2 was expressed at a low level on all T cells, AD2 was highly expressed on the CD3-CD4-CD8-, CD3-CD4low+ CD8-, and CD3- CD4+ CD8+ subsets of immature thymocytes in the thymic subcapsular and inner cortex. Taken together, these data suggest a role for the AD2 molecule in interactions of T cells with epithelial cells of skin and thymus.


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