Step 1: Understanding the Concept:
The question asks which enzyme is the common drug target for treating hypertension.
Step 2: Key Concept or Approach:
Blood pressure is controlled in part by the renin-angiotensin system, where angiotensin I is converted into the vasoconstrictor angiotensin II. Blocking that conversion step is a direct way to lower blood pressure.
Step 3: Detailed Explanation:
COX inhibition treats pain and inflammation, and HMG-CoA reductase inhibition treats high cholesterol, neither of which directly targets the mechanism that raises blood pressure.
MAO inhibition changes neurotransmitter levels and is used for depression, again not a direct blood pressure pathway.
Angiotensin-converting enzyme sits exactly at the step that turns angiotensin I into angiotensin II, so blocking ACE stops that vasoconstrictor from forming, relaxes blood vessels, and lowers blood pressure.
Step 4: Final Answer:
Angiotensin-converting enzyme (ACE) is the enzyme commonly targeted to treat hypertension.