The effect of pyridoxine supplementation on erythrocyte aminotransferase activity in man Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/4m90f0091

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  • The effect of pyridoxine (PN) supplementation on the activities of erythrocyte alanine aminotransferase (EAlaAT) and aspartate aminotransferase (EAspAT) was observed in five men, aged 22 to 25 years. The subjects received a constant diet containing 1.34 mg of vitamin B-6 Monday through Friday of each week during this five-week study. Starting on day 6 of week 1, the subjects were given orally 5 mg PN daily, except on Tuesday and Thursday of each week when they were given either no PN or 2 mg of vitamin B-6 in the form of crystalline PN or as food. Basal and pyridoxal phosphate (PLP)-stimulated EAlaAT and EAspAT activities were determined weekly. Both basal and PLPstimulated activities of the two enzymes increased after only three days of PN supplementation and continued to increase throughout the four weeks of PN supplementation; percent stimulation by PLP added in vitro decreased concomitantly. It is suggested that the binding of PLP to erythrocyte apoaminotransferases may be another reservoir for vitamin B-6.
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