Tetracyclines · Pharmacology

In the treatment of periodontitis, sub-antimicrobial doses of Doxycycline are used to inhibit which host enzyme?

  1. Cyclooxygenase-2
  2. Matrix metalloproteinases
  3. Angiotensin converting enzyme
  4. Alkaline phosphatase
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Correct answer: Matrix metalloproteinases

Tetracyclines have non-antibiotic properties, including inhibition of matrix metalloproteinases such as collagenase. Blocking these enzymes prevents breakdown of periodontal connective tissue and bone.

Difficulty: Medium Question 16 of 20

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