title: On the origin of alpha-glucosidase in human urine.
abstract: The recent findings that alpha-glucosidase from human kidney was identical with one component (F1) of the alpha-glucosidases found in human urine suggested the idea that this enzyme might originate in the kidneys. The present study was performed to test this idea by immunological methods. Urine alpha-glucosidase F1 was isolated in the electrophoretically homogeneous state, and the antibody prepared in rabbits was purified by affinity chromatography after the antisera were fractionally precipitated with ammonium sulfate and chromatographed on diethylamino ethyl (DEAE)-cellulose. The staining of human kidney tissue sections was performed by the indirect method, using alpha-glucosidase F1 antibody and fluorescein-conjugated anti-rabbit immunoglobulin goat sera. The proximal convoluted portion (proximal tubules) with brush border and Henle's loops (late proximal) were stained clearly. Preincubation of intact antibody with purified antigen prevented specific staining of the proximal convoluted portion and Henle's loops. In contrast, all other tissues of kidney were stained less positively or negatively. These results indicate that alpha-glucosidase F1 originates in the kidney, and that glucosidase is specifically localized in the proximal convoluted portion and Henle's loops.
mesh_terms: D000328:Adult; D000939:Epitopes; D005455:Fluorescent Antibody Technique; D005959:Glucosidases / Q000652:urine*; D006801:Humans; D007668:Kidney / Q000201:enzymology*; D007687:Kidney Tubules, Proximal / Q000201:enzymology; D008138:Loop of Henle / Q000201:enzymology; D008297:Male; D000520:alpha-Glucosidases / Q000032:analysis / Q000276:immunology / Q000652:urine*
chemical_list: D000939:Epitopes; D005959:Glucosidases; D000520:alpha-Glucosidases