ABSTRACT
For exploring pathogenesis of pyrimidine 5'-nucleotidase (P5'N) deficiency, a quantitative assay method for human erythrocyte pyrimidine 5'-nucleotidase was established. The specific substrate uridine monophosphate (UMP) of P5'N was used as ligand. The UPM-ADH-Sepharose 4B affinity column was prepared. P5'N of human erythrocyte was purified by ammonium sulfate fractionation and precipitation, ion chromatography and affinity chromatography. Rabbit anti-human P5'N antibody was acquired by immunizing rabbits with purified P5'N. Using rabbit anti-human antibody as the coated anti-body and HRP-rabbit anti-human antibody as demonstrated anti-body, the double antitody sandwich ELISA for quantitative assay of human erythrocyte P5'N was established after square rank trial, antigen blocked trial and antigen substituted test. Results showed that the titer of rabbit anti-human erythrocyte was 1:4 and the sensitivity of double antibody sandwich ELISA was 5 ng/ml. Its blocking rate was more than 95% and the rate of substitution less than 30%. The content of P5'N was (71.77 + 10.98) ng/mg NHP in normal human erythrocyte. A new ELISA method for quantitative determination of human erythrocyte P5'N was first established. It not only had high specificity and sensitivity but also could assay the minimun content of P5'N as 5 - 20 ng/ml. It could be a suitable method for large sample in clinics.