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Epipodophyllotoxin
Epipodophyllotoxins are substances naturally occurring in the root of American Mayapple plant (''Podophyllum peltatum''). Some epipodophyllotoxin derivatives are currently used in the treatment of cancer. These include etoposide and teniposide. They act as anti-cancer drugs by inhibiting topoisomerase II.Takimoto CH, Calvo E"Principles of Oncologic Pharmacotherapy" in Pazdur R, Wagman LD, Camphausen KA, Hoskins WJ (EdsCancer Management: A Multidisciplinary Approach 11 ed. 2008. See also *Podophyllotoxin Podophyllotoxin (PPT) is the active ingredient in Podofilox, which is a medical cream that is used to treat genital warts and molluscum contagiosum. It is not recommended in HPV infections without external warts. It can be applied either by a he ... References {{botany-stub Plant toxins Benzodioxoles ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etoposide
Etoposide, sold under the brand name Vepesid among others, is a chemotherapy medication used for the treatments of a number of types of cancer including testicular cancer, lung cancer, lymphoma, leukemia, neuroblastoma, and ovarian cancer. It is also used for hemophagocytic lymphohistiocytosis. It is used by mouth or intravenously, injection into a vein. Side effects are very common. They can include cytopenia, low blood cell counts, vomiting, loss of appetite, diarrhea, hair loss, and fever. Other severe side effects include allergic reactions and low blood pressure. Use during pregnancy will likely harm the fetus. Etoposide is in the topoisomerase inhibitor family of medication. It is believed to work by damaging DNA. Etoposide was approved for medical use in the United States in 1983. It is on the WHO Model List of Essential Medicines, World Health Organization's List of Essential Medicines. Medical uses Etoposide is used as a form of chemotherapy for cancers such as Kaposi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Etoposide
Etoposide, sold under the brand name Vepesid among others, is a chemotherapy medication used for the treatments of a number of types of cancer including testicular cancer, lung cancer, lymphoma, leukemia, neuroblastoma, and ovarian cancer. It is also used for hemophagocytic lymphohistiocytosis. It is used by mouth or intravenously, injection into a vein. Side effects are very common. They can include cytopenia, low blood cell counts, vomiting, loss of appetite, diarrhea, hair loss, and fever. Other severe side effects include allergic reactions and low blood pressure. Use during pregnancy will likely harm the fetus. Etoposide is in the topoisomerase inhibitor family of medication. It is believed to work by damaging DNA. Etoposide was approved for medical use in the United States in 1983. It is on the WHO Model List of Essential Medicines, World Health Organization's List of Essential Medicines. Medical uses Etoposide is used as a form of chemotherapy for cancers such as Kaposi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Podophyllotoxin
Podophyllotoxin (PPT) is the active ingredient in Podofilox, which is a medical cream that is used to treat genital warts and molluscum contagiosum. It is not recommended in HPV infections without external warts. It can be applied either by a healthcare provider or the person themselves. It is a non-alkaloid toxin lignin extracted from the roots and rhizomes of ''Podophyllum'' species. A less refined form known as podophyllum resin is also available, but has greater side effects. Podophyllotoxin was first isolated in pure form in 1880 by Valerian Podwyssotzki (1818 – 28 January 1892), a Polish-Russian privatdozent at the University of Dorpat (now: Tartu, Estonia) and assistant at the Pharmacological Institute there. It is on the World Health Organization's List of Essential Medicines. Medical uses Podophyllotoxin possesses a large number of medical applications, as it is able to stop replication of both cellular and viral DNA by binding necessary enzymes. It can addit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Podophyllum Peltatum
''Podophyllum peltatum'' is an herbaceous perennial plant in the family Berberidaceae. Its common names are mayapple, American mandrake, wild mandrake, and ground lemon. It is widespread across most of the eastern United States and southeastern Canada. Mayapples are woodland plants, typically growing in colonies derived from a single root. The stems grow to 30–40 cm (12 in to 16 in) tall, with palmately lobed umbrella-like leaves up to 20–40 cm (8 in to 16 in) diameter with 3–9 shallowly to deeply cut lobes. The plants produce several stems from a creeping underground rhizome; some stems bear a single leaf and do not produce any flower or fruit, while flowering stems produce a pair or more leaves with 1–8 flowers in the axil between the apical leaves. The flowers are white, yellow or red, 2–6 cm (1" to 2") diameter with 6–9 petals, and mature into a green, yellow or red fleshy fruit 2–5 cm (1 in to 2 in) long. All t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cancer
Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body. These contrast with benign tumors, which do not spread. Possible signs and symptoms include a lump, abnormal bleeding, prolonged cough, unexplained weight loss, and a change in bowel movements. While these symptoms may indicate cancer, they can also have other causes. Over 100 types of cancers affect humans. Tobacco use is the cause of about 22% of cancer deaths. Another 10% are due to obesity, poor diet, lack of physical activity or excessive drinking of alcohol. Other factors include certain infections, exposure to ionizing radiation, and environmental pollutants. In the developing world, 15% of cancers are due to infections such as ''Helicobacter pylori'', hepatitis B, hepatitis C, human papillomavirus infection, Epstein–Barr virus and human immunodeficiency virus (HIV). These factors act, at least partly, by changing the genes of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teniposide
Teniposide (trade name Vumon) is a chemotherapeutic medication used in the treatment of childhood acute lymphocytic leukemia (ALL), Hodgkin's lymphoma, certain brain tumours, and other types of cancer. It is in a class of drugs known as podophyllotoxin derivatives and slows the growth of cancer cells in the body.Drugs.com: Teniposide . Medical uses Teniposide is used for the treatment of a number of cancer types in children. In the US, it is approved for the second-line therapy of acute lymphocytic leukemia (ALL) in combination with other antineoplastic drugs. In Europe, it is also approved for the treatment of Hodgkin's lymphoma, generalized malignant lymphoma, reticulocyte sarcoma, acute leukaemia, primary brain tumours (glioblastoma, ependymoma, astrocytoma), bladder cancer, neuroblastoma and other solid tumours in children. Administration The medication is injected though a vein and burns if it leaks under the skin. It can be used in combination with other anticancer drugs. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Topoisomerase II
Type II topoisomerases are topoisomerases that cut both strands of the DNA helix simultaneously in order to manage DNA tangles and supercoils. They use the hydrolysis of ATP, unlike Type I topoisomerase. In this process, these enzymes change the linking number of circular DNA by ±2. Topoisomerases are ubiquitous enzymes, found in all living organisms. In animals, topoisomerase II is a chemotherapy target. In prokaryotes, gyrase is an antibacterial target. Indeed, these enzymes are of interest for a wide range of effects. Function Type II topoisomerases increase or decrease the linking number of a DNA loop by 2 units, and it promotes chromosome disentanglement. For example, DNA gyrase, a type II topoisomerase observed in ''E. coli'' and most other prokaryotes, introduces negative supercoils and decreases the linking number by 2. Gyrase is also able to remove knots from the bacterial chromosome. Along with gyrase, most prokaryotes also contain a second type IIA topoisomerase, ter ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant Toxins
A toxin is a naturally occurring organic poison produced by metabolic activities of living cells or organisms. Toxins occur especially as a protein or conjugated protein. The term toxin was first used by organic chemist Ludwig Brieger (1849–1919) and is derived from the word toxic. Toxins can be small molecules, peptides, or proteins that are capable of causing disease on contact with or absorption by body tissues interacting with biological macromolecules such as enzymes or cellular receptors. Toxins vary greatly in their toxicity, ranging from usually minor (such as a bee sting) to potentially fatal even at extremely low doses (such as botulinum toxin). Toxins are largely secondary metabolites, which are organic compounds that are not directly involved in an organism's growth, development, or reproduction, instead often aiding it in matters of defense. Terminology Toxins are often distinguished from other chemical agents strictly based on their biological origin. Less s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
