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Arginine:glycine amidinotransferase deficiency or AGAT deficiency is an autosomal recessive cerebral creatine deficiency caused by a deficiency of the enzyme arginine:glycine amidinotransferase. This enzyme deficiency results in decreased creatine synthesis, and is caused by biallelic pathogenic variants in GATM .
Notably, over 70% of tumors show reduced ASS1 transcription, making these cancer cells reliant on external sources of arginine, which forms the basis of arginine-deprivation therapy. [8] The investigational drug pegargiminase that degrades arginine is currently in trials for the treatment of ASS1 deficient cancers. [9]
Studies in which oral creatine monohydrate supplements were given to patients with CTD found that patients did not respond to treatment. However, similar studies conducted in which patients that had GAMT or AGAT deficiency were given oral creatine monohydrate supplements found that patient's clinical symptoms improved.
Creatine is synthesized predominantly in the kidney and liver, by a two-step enzymatic process. In the first step, glycine and arginine are combined by arginine:glycine amidinotransferase (AGAT) to form guanidinoacetate. This step also results in the production of ornithine. Creatine is produced by the enzyme guanidinoacetate methyltransferase ...
The treatment for this is creatine supplements since the body cannot make the creatine on its own. The positive results of creatine treatment (in AGAT deficiencies) and the observation that fetal and early postnatal development are normal in these patients support the hypothesis that earlier diagnosis and treatment can substantially improve the ...
Argininemia is an autosomal recessive urea cycle disorder where a deficiency of the enzyme arginase causes a buildup of arginine and ammonia in the blood.Ammonia, which is formed when proteins are broken down in the body, is toxic if levels become too high; the nervous system is especially sensitive to the effects of excess ammonia.
The majority of drugs used in cancer chemotherapy are cytostatic, many via cytotoxicity. A fundamental philosophy of medical oncology , including combination chemotherapy, is that different drugs work through different mechanisms, and that the results of using multiple drugs will be synergistic to some extent.
Cancer cells are cells that divide continually, forming solid tumors or flooding the blood or lymph with abnormal cells. Cell division is a normal process used by the body for growth and repair. A parent cell divides to form two daughter cells, and these daughter cells are used to build new tissue or to replace cells that have died because of ...
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