Floxuridine

Biosynthesis of Floxuridine

Floxuridine is a chemotherapeutic agent used primarily in the treatment of cancer. It is an antimetabolite that interferes with the synthesis of DNA, thereby inhibiting the growth of rapidly dividing cancer cells. Floxuridine is particularly effective in the treatment of gastrointestinal cancers, especially those that have metastasized to the liver.

Mechanism of Action

Floxuridine is a fluorinated pyrimidine analog. It is converted into 5-fluorouracil (5-FU) in the body, which is then metabolized into active metabolites that disrupt the synthesis of DNA and RNA. The primary mechanism involves the inhibition of the enzyme thymidylate synthase, which is crucial for the synthesis of thymidine, a nucleotide necessary for DNA replication. By inhibiting this enzyme, floxuridine effectively halts the proliferation of cancer cells.

Administration

Floxuridine is typically administered via continuous intravenous infusion directly into the hepatic artery. This method allows for high concentrations of the drug to be delivered directly to liver tumors, maximizing its efficacy while minimizing systemic exposure and side effects.

Side Effects

The side effects of floxuridine are similar to those of other antimetabolites and include nausea, vomiting, diarrhea, and myelosuppression. Myelosuppression can lead to decreased production of blood cells, resulting in anemia, increased risk of infection, and bleeding.

Biosynthesis

The biosynthesis of floxuridine involves the incorporation of a fluorine atom into the pyrimidine ring, creating a compound that can mimic the natural nucleoside uridine. This modification allows floxuridine to be incorporated into RNA and DNA, disrupting their normal function and leading to cell death.

Related Pages

• Chemotherapy
• Antimetabolite
• Thymidylate synthase
• 5-Fluorouracil
• Cancer treatment