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The distal convoluted tubule (DCT) is a portion of kidney nephron between the loop of Henle and the collecting duct system. It is partly responsible for the regulation of potassium, sodium, calcium, and pH.
Physiology
The DCT regulates pH by absorbing bicarbonate and secreting protons (H+) into the filtrate. Sodium and potassium levels are controlled by secreting K+ and absorbing Na+.
Sodium absorption by the distal tubule is mediated by the hormone aldosterone. Aldosterone increases sodium reabsorption. Sodium and chlorine (salt) reabsorption is also mediated by a group of kinases called WNK kinases. There are 4 different WNK kinases, WNK1, WNK2, WNK3, and WNK4.
The DCT also participates in calcium regulation by absorbing Ca2+ in response to parathyroid hormone.
Thiazide diuretics inhibit Na+/Cl- reabsorption from the DCT.
Histology
Histologically, cells of the DCT can be differentiated from cells of the proximal convoluted tubule:
- DCT cells do not have an apical brush border
- DCT cells are less eosinophilic than proximal cells
- DCT cells have less cytoplasm
- DCT cells are more likely to have visible nuclei
External links
"Distal convoluted tubule"