Drug Metabolism · Pharmacology

The Cytochrome P450 (CYP) enzyme system is primarily located in which organelle of the hepatocyte?

  1. Rough endoplasmic reticulum
  2. Smooth endoplasmic reticulum
  3. Mitochondrial intermembrane space
  4. Golgi apparatus
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Correct answer: Smooth endoplasmic reticulum

CYP enzymes are microsomal enzymes found in the smooth endoplasmic reticulum of liver cells. They play a critical role in the Phase I metabolism of a vast majority of therapeutic drugs.

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