Mechanism of action of triazoles is:
**Core Concept**
Triazoles are a class of antifungal medications that work by inhibiting the synthesis of ergosterol, a critical component of fungal cell membranes. This disruption leads to cell lysis and ultimately, fungal death.
**Why the Correct Answer is Right**
The mechanism of action of triazoles involves the inhibition of lanosterol 14α-demethylase, an enzyme responsible for converting lanosterol to ergosterol. By blocking this enzyme, triazoles prevent the production of ergosterol, which is essential for maintaining the structural integrity of fungal cell membranes. This leads to increased permeability of the cell membrane, resulting in cell death.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the mechanism of action of triazoles. While some antifungal medications may work by inhibiting cell wall synthesis, triazoles target the cell membrane.
**Option B:** This option is incorrect because it refers to the mechanism of action of sulfonamides, not triazoles. Sulfonamides inhibit dihydropteroate synthase, an enzyme involved in folic acid synthesis.
**Option C:** This option is incorrect because it describes the mechanism of action of beta-lactam antibiotics, not triazoles. Beta-lactam antibiotics inhibit cell wall synthesis by targeting penicillin-binding proteins.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that triazoles are effective against a wide range of fungal pathogens, including Candida, Aspergillus, and Cryptococcus. However, their use is limited by potential drug interactions and the risk of liver toxicity.
**Correct Answer:** C. Inhibition of lanosterol 14α-demethylase.