A type of drug that stops cells from using folic acid to make DNA and may kill cancer cells. Certain antifolates are used to treat some types of cancer and inflammatory conditions, such as rheumatoid arthritis. Also called folate antagonist and folic acid antagonist.
How do antifolates work?
Some such as proguanil, pyrimethamine and trimethoprim selectively inhibit folate’s actions in microbial organisms such as bacteria, protozoa and fungi. The majority of antifolates work by inhibiting dihydrofolate reductase (DHFR).
What are antimetabolite drugs?
Antimetabolites are a form of chemotherapy drug. They’re one of the most commonly used therapies to treat cancer. And they’re one of the oldest, dating back to the 1940s, when doctors used a medication that’s now considered an antimetabolite to treat children with leukemia.
Is methotrexate an antifolate?
Methotrexate is an antifolate and antimetabolite originally developed to treat malignancy. In the setting of RA, it is given at much lower doses than when given as an anticancer agent. The usual dose is 7.5 to 25 mg per week given as a single dose orally.
Why is folate good for you?
Folate (vitamin B-9) is important in red blood cell formation and for healthy cell growth and function. The nutrient is crucial during early pregnancy to reduce the risk of birth defects of the brain and spine.
Is atovaquone an antifolate?
The proguanil-atovaquone combination has a synergistic effect, although atovaquone, acting on mitochondrial electron transport system, is not an antifolate drug and the mechanism of synergism is still poorly understood.
What drugs inhibit folic acid?
A number of drugs such as aminopterin, methotrexate (amethopterin), pyrimethamine, trimethoprim and triamterene act as folate antagonists and produce folate deficiency by inhibiting this enzyme.
Is doxorubicin an antimetabolite?
Anthracyclines are anti-tumor antibiotics that interfere with enzymes involved in copying DNA during the cell cycle. Examples of anthracyclines include: Daunorubicin. Doxorubicin (Adriamycin®)
Is hydroxychloroquine an antimetabolite?
Plaquenil is an antimalarial medication and Rheumatrex and Trexall are antimetabolite drugs.
What are anti-antifolates used to treat?
Antifolates. Antifolates are used to treat: breast cancer, head and neck cancer, bladder cancer, acute lymphocytic leukemia, non-Hodgkin’s lymphoma, choriocarcinoma, and osteogenic sarcoma. Antifolates are also being used in the treatment of non-cancerous diseases such as malaria, bacterial infections, psoriasis, and rheumatoid arthritis.
What are some drugs that are anti folate?
Such drugs include some anticonvulsants ( valproic acid, carbamazepine, phenobarbital, phenytoin, and primidone) and trimethoprim. Lamotrigine is also an anticonvulsant with known (from in vitro testing) weak anti-folate effects. Sulfonamides, a class of antimicrobials that work by inhibiting folate biosynthesis.
How do antifolates compete for binding with folates in autophagy?
Since the antifolates compete for the binding of DHFR with normal reduced folates, the increased transport of folates provided the cells as much benefit as did the decreased antifolate transport. Karin Eberhart, Devrim Gozuacik, in Autophagy: Cancer, Other Pathologies, Inflammation, Immunity, Infection, and Aging, 2014
What is the mechanism of antifolate resistance to classical antifolates?
Indeed, antifolate resistance due to decreased RFC expression has been cited in the literature since 1962 and has since emerged as an important mechanism of resistance to classical antifolates. Loss of RFC function can occur by decreased expression of the protein and thus decreased levels of membrane-bound RFC.
