has part has part has_part brush border epithelial cell epithelial cell of proximal tubule brush border cell of the proximal tubule 2010-09-14T11:29:20Z A brush border epithelial cell located in the proximal tubule of the kidney, essential for reabsorbing substances like glucose and amino acids from the glomerular filtrate. These cells also secrete organic ions, playing a crucial role in maintaining kidney homeostasis, including electrolyte and acid-base balance, and excreting metabolic waste. The vast majority of proximal tubule epithelial cells have a brush border, but there are rare exceptions. brush border