title: Red cell lead, whole blood lead, and red cell enzymes.
abstract: Simultaneous assay of blood lead (Pb-B) and red cell lead (Pb-Rbc) in 123 samples from 104 urban and suburban students, ages 10-18, shows the ratio of concentration (Pb-Rbc)/(Pb-B) to increase as the hematocrit decreases. On direct assay in 40 samples, plasma lead (Pb-P) was fixed in a narrow range. In 28 students with Pb-Rbc >40 mug/100 ml, the mean red cell 2,3-diphosphoglycerate (2,3-DPG) was 6.05+/-0.28 (+/-S.E.), significantly higher (P<.025) than the 5.25+/-0.18 of 51 students with Pb-Rbc<40 mug/100 ml, although hemoglobin values were comparable (13.83+/-0.31 versus 13.55+/-0.20). Analysis of the individual population groups showed this correlation of Pb-Rbc with 2,3-DPG to be primarily related to the intercorrelation of each parameter with hemoglobin.Rbc membrane Na/K ATPase, as per cent of total membrane ATPase, had a median value of 60% in 48 subjects. Na/K ATPase below 60% was found in 10 (77%) of the 13 students with Pb-Rbc>/=40 mug/100 ml, but in only 14 of the 35 with Pb-Rbc<40 mug/100 ml (chi(2)=5.1, df=1, P<0.05). Correlation of significant enzyme changes with Pb-Rbc, but not with Pb-B in the normal urban range of Pb-B<35 mug/100 ml suggests Pb-Rbc, increased in anemia, to be a critical factor in the hematotoxicity of lead.
mesh_terms: D000251:Adenosine Triphosphatases; D000293:Adolescent; D002648:Child; D004163:Diphosphoglyceric Acids / Q000097:blood*; D004912:Erythrocytes / Q000201:enzymology*; D005260:Female; D005955:Glucosephosphate Dehydrogenase Deficiency / Q000097:blood; D005980:Glutathione Reductase / Q000097:blood; D006400:Hematocrit; D006454:Hemoglobins; D006801:Humans; D007854:Lead / Q000097:blood*; D008297:Male; D010770:Phosphotransferases / Q000097:blood*; D010949:Plasma / Q000201:enzymology; D011188:Potassium; D012964:Sodium; D013054:Spectrophotometry, Atomic
chemical_list: D004163:Diphosphoglyceric Acids; D006454:Hemoglobins; D007854:Lead; D012964:Sodium; D005980:Glutathione Reductase; D010770:Phosphotransferases; D000251:Adenosine Triphosphatases; D011188:Potassium