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Antifolates are a class of antimetabolite medications that antagonise (that is, block) the actions of folic acid (vitamin B 9). [1] Folic acid's primary function in the body is as a cofactor to various methyltransferases involved in serine, methionine, thymidine and purine biosynthesis.
The 2013–2014 survey reported that for adults ages 20 years and older, men consumed an average of 249 μg/day folate from food plus 207 μg/day of folic acid from consumption of fortified foods, for a combined total of 601 μg/day of dietary folate equivalents (DFEs because each microgram of folic acid counts as 1.7 μg of food folate).
Folinic acid, also known as leucovorin, is a medication used to decrease the toxic effects of methotrexate and pyrimethamine. [2] [3] It is also used in combination with 5-fluorouracil to treat colorectal cancer and pancreatic cancer, may be used to treat folate deficiency that results in anemia, and methanol poisoning.
Folic acid is a synthetic form of folate, a B vitamin found naturally in many foods. ... (chemicals found in vitamin E sources) ... healthier hair to hair loss medications approved by the FDA (U.S ...
The drug methotrexate (bottom) is an antimetabolite that interferes with the metabolism of folic acid (top). An antimetabolite is a chemical that inhibits the use of a metabolite, which is another chemical that is part of normal metabolism. [1]
Folate is an essential metabolite for bacterial growth and replication because it is used in DNA synthesis, primarily at thymidylate and purine biosynthesis, and amino acids synthesis, including serine, glycine and methionine. [12] Hence, blockage of folate production inhibits the folate-dependent metabolic processes for bacterial growth.
It works by blocking folate metabolism via dihydrofolate reductase in some bacteria, preventing creation of bacterial DNA and RNA and leading to bacterial cell death. [1] Trimethoprim was first used in 1962. [4] It is on the World Health Organization's List of Essential Medicines. [5] It is available as a generic medication. [6]
Aminopterin (or 4-aminopteroic acid), the 4–amino derivative of folic acid, is an antineoplastic drug with immunosuppressive properties often used in chemotherapy. Aminopterin is a synthetic derivative of pterin. Aminopterin works as an enzyme inhibitor by competing for the folate binding site of the enzyme dihydrofolate reductase.
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