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The human CD30-positive anaplastic large (T-) cell lymphoma cell line, KARPAS-299 (DSM ACC31), was established from blast cells in the peripheral blood from a case of non-Hodgkin lymphoma in 1988. We describe the mRNA and surface expression in KARPAS-299 cells of a panel of markers highly restricted to human natural regulatory T-cells and associated with their suppressive activity, including FOXP3, CD25, IL-10, TGF-beta1, CD62L, and Lag-3. Results obtained from co-culturing human peripheral blood leukocytes with KARPAS-299 cells assigned a suppressive phenotype to the latter ones. In conclusion, KARPAS-299 cells show characteristics typical of natural regulatory T-cells and, thus, represent a valuable model for studying regulatory T-cell function, which may also facilitate drug development aimed at the modulation of regulatory T-cell activity for the pharmacological therapy of, for example, autoimmune diseases.

Assigning the phenotype of a natural regulatory T-cell to the human T-cell line, KARPAS-299