title: Association of high-molecular-mass and electrophoretically atypical alkaline phosphatases.
abstract: Polyacrylamide gel electrophoresis of alkaline phosphatase may yield abnormally migrating fractions; these include high-molecular-mass alkaline phosphatase, which remains at the gel origin, and immunoglobulin-alkaline phosphatase complexes, which have a mobility approximately 1/3 that of liver isoenzyme. We performed a retrospective study of 19 patients whose sera exhibited atypical alkaline phosphatase fractions, defined as bands whose mobility was slower than bone, liver, or intestinal alkaline phosphatase; 17 had a mobility approximately 1/3 that of liver isoenzyme and 16 also exhibited gel origin enzyme activity or high-molecular-mass bands. The strong association of the atypical and high-molecular-mass alkaline phosphatases suggests that they may be structurally related, both consisting of either immunoglobulin-enzyme complexes or membrane-alkaline phosphatase complexes. This hypothesis is supported by (1) one serum available for investigation containing alkaline phosphatase-immunoglobulin complexes in both abnormally migrating fractions, but on detergent treatment showing no evidence of membrane-bound enzyme; (2) detergent treatment of serum from patients with only high-molecular-mass alkaline phosphatase creating bands with a mobility of approximately 1/3 that of the liver isoenzyme.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000469:Alkaline Phosphatase / Q000032:analysis*; D003902:Detergents / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D005779:Immunodiffusion; D007527:Isoenzymes / Q000032:analysis; D008297:Male; D008875:Middle Aged
chemical_list: D003902:Detergents; D007527:Isoenzymes; D000469:Alkaline Phosphatase