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l-DOPA is produced from the amino acid l-tyrosine by the enzyme tyrosine hydroxylase. l-DOPA can act as an l-tyrosine mimetic and be incorporated into proteins by mammalian cells in place of l-tyrosine, generating protease-resistant and aggregate-prone proteins in vitro and may contribute to neurotoxicity with chronic l-DOPA administration. [10]
Once levodopa has entered the central nervous system, it is converted into dopamine by the enzyme aromatic l-amino acid decarboxylase (AAAD), also known as DOPA decarboxylase (DDC). Pyridoxal phosphate (vitamin B 6) is a required cofactor in this reaction, and may occasionally be administered along with levodopa, usually in the form of pyridoxine.
DopAmide, or L-DopAmide, is a synthetic levodopa (L-DOPA) analogue that can serve as a levodopa and dopamine prodrug and is of potential interest in the treatment of Parkinson's disease. [ 1 ] [ 2 ] [ 3 ] DopAmide has an amide rather than the carboxyl group of L -DOPA, [ 2 ] [ 3 ] which imparts greater water solubility .
Carbidopa/levodopa, also known as levocarb and co-careldopa, is the combination of the two medications carbidopa and levodopa. [6] It is primarily used to manage the symptoms of Parkinson's disease, but it does not slow down the disease or stop it from getting worse. [6]
Apomorphine has a high clearance rate (3–5 L/kg/hr) and is mainly metabolized and excreted by the liver. [17] It is likely that while the cytochrome P450 system plays a minor role, most of apomorphine's metabolism happens via auto- oxidation , O -glucuronidation , O -methylation , N -demethylation , and sulfation .
Carbidopa is most commonly used as a method to inhibit the activity of DOPA decarboxylase. This is an enzyme that breaks down L-DOPA in the periphery and converts it to dopamine. This results in the newly formed dopamine being unable to cross the blood–brain barrier and the effectiveness of L-DOPA treatments is greatly decreased. Carbidopa ...
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Aromatic L-amino acid decarboxylase (AAAD) or DOPA decarboxylase inhibitors including benserazide, carbidopa, and methyldopa, which are used in the treatment of Parkinson's disease in augmentation of L-DOPA to block the peripheral conversion of dopamine, thereby inhibiting undesirable side-effects, and as sympatholytic or antihypertensive agents.
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