title: A micromethod for determining adenosine deaminase and purine nucleoside phosphorylase activity in cells from human peripheral blood.
abstract: A radiochromatographic method is described for measuring adenosine deaminase and purine nucleoside phosphorylase activity in cells from human peripheral blood. The respective substrates, [8-14C]adenosine or [8-14C]inosine, are converted either to inosine and hypoxanthine or hypoxanthine, respectively. A single simple and rapid chromatographic procedure is used to isolate the products of both reactions. The mean normal activity (nmol h-1mg-1) of ADA for erythrocytes is 63 +/- 24 (+/- 1 S.D.) for leukocytes, 750 +/- 280 and for lymphocytes, 2105 +/- 1170. Corresponding activities for purine nucleoside phosphorylase are 1850 +/- 490, 3665 +/- 1170 and 5890 +/- 2030. With the described methods a further patient with severe combined immuno-deficiency and adenosine deaminase deficiency has been identified.
mesh_terms: D000243:Adenosine Deaminase / Q000097:blood*; D000328:Adult; D002648:Child; D004912:Erythrocytes / Q000201:enzymology; D005260:Female; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000201:enzymology; D007962:Leukocytes / Q000201:enzymology; D008214:Lymphocytes / Q000201:enzymology; D008297:Male; D008832:Microchemistry; D009700:Nucleoside Deaminases / Q000097:blood*; D010430:Pentosyltransferases / Q000097:blood*; D011683:Purine-Nucleoside Phosphorylase / Q000097:blood*
chemical_list: D010430:Pentosyltransferases; D011683:Purine-Nucleoside Phosphorylase; D009700:Nucleoside Deaminases; D000243:Adenosine Deaminase