title: Quantitative measurement of glucose-6-phosphate dehydrogenase in cortical fractions of the rabbit nephron.
abstract: A quantitative fluorimetric method is described for estimating the activity of glucose-6-phosphate dehydrogenase in isolated fractions of rabbit nephron from the superficial part of the renal cortex: macula densa, proximal convoluted tubule, distal convoluted tubule and glomerulus. The mean activity in the macula densa region was 2.5 X 10(-18) mol/micrometers 3/min, which was about twice the mean activity of the proximal and distal tubular cells and four times that of the glomeruli. As glucose-6-phosphate dehydrogenase is located in the cytoplasm, the average cytoplasmic enzyme activity of the different tubular cells was calculated: macula densa activity was 4.0 X 10(-18) mol/micrometers 3/min whilst proximal tubular cells showed about a third, and distal tubular cells about a quarter of this activity.
mesh_terms: D000818:Animals; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism*; D006651:Histocytochemistry / Q000379:methods; D007678:Kidney Glomerulus / Q000201:enzymology; D007686:Kidney Tubules, Distal / Q000201:enzymology; D007687:Kidney Tubules, Proximal / Q000201:enzymology; D008297:Male; D009399:Nephrons / Q000166:cytology / Q000201:enzymology*; D011817:Rabbits
chemical_list: D005954:Glucosephosphate Dehydrogenase