title: Glycylprolyl-diaminopeptidase in human leukocytes: selective occurrence in T lymphocytes and influence on the total serum enzyme activity.
abstract: Using biochemical methods glycylprolyl-diaminopeptidase (GP-DAP, EC 3.4.14.5) was measured in purified leukocyte subpopulations and found selectively in T lymphocytes. In 129 subjects with normal hepatic function a significant correlation was observed between the serum GP-DAP activity and the peripheral blood lymphocyte count. In four patients suffering from rheumatoid arthritis, four weeks of thoracic duct drainage resulted in a reduction of the peripheral blood lymphocyte count and a concomitant decrease of the serum GP-DAP activity. These observations suggest that lymphocytic GP-DAP may contribute to the total serum GP-DAP activity.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000201:enzymology; D018819:Dipeptidyl Peptidase 4; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases / Q000097:blood*; D004322:Drainage; D010450:Endopeptidases / Q000097:blood*; D006801:Humans; D007958:Leukocyte Count; D013601:T-Lymphocytes / Q000201:enzymology*; D013897:Thoracic Duct
chemical_list: D010450:Endopeptidases; D004152:Dipeptidyl-Peptidases and Tripeptidyl-Peptidases; D018819:Dipeptidyl Peptidase 4