Thiazide Diuretics · Pharmacology

What is the primary molecular target inhibited by thiazide diuretics in the nephron?

  1. Na+/K+/2Cl- cotransporter
  2. Na+/Cl- symporter (NCC)
  3. Carbonic anhydrase
  4. Epithelial sodium channel (ENaC)
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Correct answer: Na+/Cl- symporter (NCC)

Thiazide diuretics work by binding to the chloride site of the Na+/Cl- symporter (NCC) in the early distal convoluted tubule. This leads to increased urinary excretion of sodium and chloride.

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