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Antimetabolites: Sulfonamides and trimethoprim
Cell wall synthesis inhibitors: Cephalosporins
Cell wall synthesis inhibitors: Penicillins
DNA synthesis inhibitors: Fluoroquinolones
DNA synthesis inhibitors: Metronidazole
Mechanisms of antibiotic resistance
Miscellaneous cell wall synthesis inhibitors
Miscellaneous protein synthesis inhibitors
Protein synthesis inhibitors: Aminoglycosides
Protein synthesis inhibitors: Tetracyclines
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cytochrome P p. -473, 253
gynecomastia from p. 673
PCOS p. 669
reproductive hormones and p. 679
The “azole” antifungals are a family of medications used to treat mycoses, or fungal infections.
Mycoses can be superficial, like on the skin or hair, or develop into systemic infections in immunodeficient people.
Antifungals work either through fungistatic action, meaning that they inhibit fungal growth, or through fungicidal action, meaning they kill the fungi.
Most fungal cells have a tough outer cell wall and an inner cell membrane.
The cell membrane is mostly made of phospholipids with some sterol or modified steroid molecules mixed in.
Humans have cholesterol, while fungi have ergosterol.
Both sterol molecules help keep the cell membrane stable at a wide range of temperatures.
Now, the precursor to both molecules is lanosterol.
Fungi have a cytochrome p450 enzyme called fourteen-alpha-demethylase in their mitochondria and endoplasmic reticulums, which converts lanosterol to ergosterol.
Without ergosterol, the structure of the cell membrane will be disrupted.
This will cause membrane-bound proteins, like ion channels, to stop working properly.
The membrane also becomes fragile, which eventually leads to inhibition of fungal growth.
The azole antifungals include imidazoles, like clotrimazole, isoconazole, miconazole, butoconazole, fenticonazole, and ketoconazole; as well as triazoles like fluconazole, itraconazole and voriconazole.
These medications work by inhibiting the fourteen-alpha-demethylase enzyme.
However, they also inhibit human cytochrome P450 enzymes to a lesser degree.
Azoles are synthetic antifungals with broad spectrum activity against various fungal infections. Azoles bind to the ergosterol molecule in the fungal cell membrane and cause holes to form, which damages the cell membrane and eventually kills the fungus. Examples of azoles include drugs like clotrimazole, fluconazole, and itraconazole. Some of the side effects of azoles include nausea and vomiting, gynecomastia, and hepatotoxicity.
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