Some Aspects of the Evaluation of Brush Border Enzymuria Originating from Proximal Renal Tubules as Screening Test in Patients with Psoriatic Arthritis

Brush border morphology with the brush epithelium, increases the cell surface, especially useful for absorption. The cells that absorb supstances have great necessity of contact surface with substances in order to be efficacious. The luminal surface of the epithelial cells from this segment of the nephron is covered with densely packed microvilli that form border, whish can be seen under light microscope. The microvilli in great measure increase the luminal surface of the cells which in great measure facilitate their resorptive function. Membranes inverted inside that form microvilli are the places for numerous sodium pumps.