Aristolochic acid

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Aristolochic acid structure

Aristolochic acid refers to a group of naturally occurring compounds found in the plant family Aristolochiaceae, particularly in the genus Aristolochia. These compounds are known for their potent nephrotoxic and carcinogenic properties, which have significant implications for human health.

Chemical Structure

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3D space-filling model of Aristolochic acid

Aristolochic acids are nitrophenanthrene carboxylic acids. The most common forms are aristolochic acid I and II, which differ slightly in their chemical structure. These compounds are characterized by a nitro group attached to a phenanthrene ring system, which is crucial for their biological activity.

Sources and Occurrence

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Aristolochia clematitis plant

Aristolochic acids are primarily found in plants of the genus Aristolochia, such as Aristolochia clematitis. These plants have been used in traditional medicine for centuries, despite the known risks associated with their consumption.

Toxicity and Health Effects

Aristolochic acids are highly toxic to the kidneys and have been linked to the development of aristolochic acid nephropathy (AAN), a form of kidney failure. They are also potent carcinogens, associated with an increased risk of urothelial cancer. The mechanism of toxicity involves the formation of DNA adducts, which can lead to mutations and cancer.

Biosynthesis

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Biosynthesis pathway of Aristolochic acid

The biosynthesis of aristolochic acids in plants involves several enzymatic steps, starting from simple aromatic precursors. The pathway includes the formation of the phenanthrene core and the introduction of the nitro group, which is essential for the biological activity of these compounds.

Regulation and Safety

Due to their toxic effects, the use of aristolochic acid-containing plants in herbal medicine is highly regulated in many countries. The U.S. Food and Drug Administration (FDA) and other health organizations have issued warnings against the use of products containing aristolochic acids.

Related Compounds

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Aristolactams structure

Aristolactams are related compounds that share a similar phenanthrene structure but differ in their biological activity. While they are less toxic than aristolochic acids, their presence in the same plants raises concerns about the overall safety of these herbal products.

Related Pages

• Aristolochia
• Nephrotoxicity
• Carcinogen
• Herbal medicine