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MELATONIN SYNTHESIS AND METABOLISM Melatonin Synthesis Melatonin (N-acetyl-5-methoxytryptamine) is synthesized within the pinealocytes from tryptophan, mostly occurring during the dark phase of the day, when there is a major increase in the activity of serotonin-N-acetyltransferase (arylalkylamine N-acetyltransferase, AA-NAT), responsible for the transformation of 5-hydroxytryptamine (5HT, serotonin) to N-acetylserotonin (NAS) (Figure 1)

An ton cho da: Sn phm dc m phm tin phong i km vi cc chng nhn lm sng, nghin cu phn tch mang li pH chun (3.7-5.7) rt an ton, lnh tnh v hn ch kch ng trn da, k c da nhy cm

Under physiological conditions, the antioxidant system in the body, covering antioxidant enzymes [superoxide dismutase, catalase (CAT), and glutathione (GSH) peroxidase (GPX)] and antioxidants (vitamins C and E, flavonoids, carotenoids, GSH, and micronutrients), is involved in maintaining the dynamic balance between ROS production and metabolism

Finally it should be noted that homozygous disruption of Trx1 or TrxR1 in mouse zygotes results in severe defects in early embryonic patterning without having any detectable impacts on either the level of cellular oxidative stress or cell proliferation [49, 108, 177181]