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By interfering with the metabolism of cancer cells, antimetabolites are a family of medications used in chemotherapy to treat cancer. Antimetabolites cause cellular disruption and eventually cell death by imitating vital chemicals required for cell growth. 350 words are provided to further explain antimetabolites:Antimetabolites work by interfering with important metabolic processes that are necessary for the growth of cells. These medications mimic naturally occurring substances that are essential for the creation of RNA, DNA, and other biological components. They integrate onto DNA or RNA once they are inside the cell, preventing them from doing their intended job. Methotrexate is among the antimetabolites that is most frequently utilized. As a folate analog, methotrexate competes with folic acid, a nutrient necessary for DNA synthesis. Thymidine is a building block of DNA, and methotrexate prevents it from being produced by blocking the enzyme dihydrofolate reductase. Cancer cells are unable to accurately replicate their DNA due to this interference, which ultimately results in cell death. 5-fluorouracil (5-FU) is another antimetabolite that is noteworthy. 5-FU and uracil, one of the four nucleobases that make up RNA, are structurally identical. 5-FU disrupts RNA production once it is integrated into RNA, resulting in faulty RNA molecules. Moreover, 5-FU can be transformed into active metabolites that hinder the synthesis of DNA by inhibiting thymidylate synthase, hence reducing the growth of cancer cells. Cytarabine is an additional antimetabolite that is used to treat leukemia and other cancers. It is sometimes referred to as cytosine arabinoside or Ara-C. Cytidine, an element of DNA and RNA, is similar to cytarabine. Cytarabine is phosphorylated to its active form once it enters the cell, where it competes with cytidine to be incorporated into DNA. Nevertheless, once cytarabine is integrated, DNA polymerase is unable to efficiently add further nucleotides, which results in DNA strand termination and eventual cell death. A more recent antimetabolite called gemcitabine has demonstrated effectiveness in the treatment of a number of solid tumors, such as non-small cell lung cancer and pancreatic cancer. Gemcitabine functions by preventing DNA synthesis and shares structural similarities with cytidine. Gemcitabine enters the cell and is phosphorylated into its active form before being integrated into DNA. Cell death results from this incorporation's disruption of DNA replication and repair pathways. For antimetabolites to be as successful as possible in killing cancer cells, they are frequently used in combination with other chemotherapy medications. On the other hand, they can also impact normally dividing cells that divide quickly, which can result in adverse effects such hair loss, gastrointestinal toxicity, and suppression of bone marrow. To sum up, antimetabolites are an important class of chemotherapeutic medications that disrupt the metabolism of cancer cells, ultimately resulting in cell death. Despite the fact that they have transformed the way cancer is treated and increased patient survival rates, their use can have serious adverse effects that call for close observation and management throughout the course of treatment.