The specificity of the expression of dipeptidylaminopeptidase-IV (DAP-IV) was examined in cells from leukemia patients and in 33 normal and leukemic human cell lines widely used in various studies. There was no correlation between DAP-IV activity and OKT4 positivity or maturation stage in T cells. In addition, DAP-IV was unexpectedly expressed by 4 B cell lines and 1 histiocytic lymphoma cell line, indicating either lack of specificity of DAP-IV or infidelity of gene expression under unnatural culture environment.

Keywords:
B cells, Dipeptidylaminopeptidase-IV, Leukemia, human, T cells
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© 1986 S. Karger AG, Basel
1986
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