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JOURNAL ARTICLE
REVIEW
[The application of N-acetylcysteine in optimization of specific pharmacological therapies].
Polski Merkuriusz Lekarski : Organ Polskiego Towarzystwa Lekarskiego 2017 September 30
Based on the analysis of data from clinical trials it could be postulated that N-acetylcysteine has a positive impact on the treatment of various diseases. However, less is known about specific molecular and physiological mechanisms underlying the reported therapeutic effects. N-acetylcysteine (NAC, N-acetyl-L-cysteine) is an amino acid derivative containing a thiol group. It is a precursor of L-cysteine and glutathione. NAC is well absorbed and safe for the body at doses up to 300 mg per kg of body weight. Side effects are relatively rare. NAC is used as an mucolytic agent in adjunctive therapy of respiratory diseases causing the retention of secretions, as well as an antidote in the treatment of paracetamol poisoning. Moreover, NAC protects against the toxic effects of reactive oxygen species and their active metabolites. NAC is involved in free radical scavenging processes via several independent mechanisms, including a direct reduction of free radicals, providing substrates for oxidation-reduction reactions and activation of antioxidant enzymes. In the blood, NAC decreases the level of low density lipoprotein peroxidation. In various tissues, NAC may increase the levels of glutathione and cysteine and stimulate the superoxide dismutase action. NAC is used as a supplement in the treatment of various diseases associated with impaired exterior and intracellular oxidative balance. NAC increases the concentrations of amino acids and their derivatives, including cysteine, cystine, and glutathione. It also stabilizes the antioxidant status of the cells and the intercellular spaces. NAC changes the levels of transcription factors, modifying the transcription of selected genes and acting on the protein translation. It works on the activation of several enzymes in the cells and outside the cells. Based on the analysis of data from clinical trials it can be concluded, that an administration of NAC may be beneficial for these groups of patients, in whom the reversible accumulation and the negative action of free radicals was observed.
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