Choose the false statement(s). Select all that apply.
a. Antifungal drugs may target cholesterol in fungal cell membranes.
b. Azole and polyene drugs promote cell lysis by impacting fungal cell plasma membranes.
c. Echinocandin drugs inhibit fungal cell wall synthesis.
d. Antifungal drugs may target DNA replication.
e. Antifungal drugs may target protein synthesis.

검증된 단계별 안내

Step 1: Understand the target structures and processes of antifungal drugs. Antifungal drugs typically target components unique to fungi, such as ergosterol in the fungal cell membrane or the fungal cell wall, which contains glucans and chitin.

Step 2: Evaluate statement (a). Cholesterol is a component of animal cell membranes, while fungi have ergosterol instead. Therefore, antifungal drugs target ergosterol, not cholesterol, in fungal membranes. This suggests statement (a) is false.

Step 3: Evaluate statement (b). Azoles inhibit ergosterol synthesis, and polyenes bind to ergosterol, disrupting fungal plasma membranes and causing cell lysis. This is a true statement.

Step 4: Evaluate statement (c). Echinocandins inhibit the synthesis of β-glucan, an essential component of the fungal cell wall, making this statement true.

Step 5: Evaluate statements (d) and (e). Antifungal drugs generally do not target DNA replication or protein synthesis directly, as these processes are similar in fungi and human cells, making selective targeting difficult. Therefore, these statements are false.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Fungal Cell Membrane Composition

Fungal cell membranes contain ergosterol, not cholesterol, which is the primary target of many antifungal drugs. Understanding this difference is crucial because drugs like azoles and polyenes bind to ergosterol to disrupt membrane integrity, leading to fungal cell death.

Mechanism of Action of Antifungal Drug Classes

Azoles inhibit ergosterol synthesis, and polyenes bind ergosterol to create membrane pores, both causing cell membrane disruption. Echinocandins inhibit synthesis of β-glucan, a key component of the fungal cell wall, weakening structural integrity and causing cell lysis.

Targets of Antifungal Drugs Beyond Membranes and Cell Walls

Unlike antibacterial drugs, most antifungals do not target DNA replication or protein synthesis in fungi. These processes are less commonly targeted due to similarities between fungal and human cells, which increases toxicity risk.