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- W1976647510 abstract "Brain noradrenaline takes part in the regulation of several brain functions. The formation of brain noradrenaline depends on brain tyrosine (Tyr) levels, which associates with the ratio in plasma of Tyr to other large, neutral amino acids (LNAA). Tyr metabolism has been studied in users of the new generation combined oral contraceptives (OC) and comparable controls at the follicular, mid-cycle, and luteal phases of the menstrual cycle. OC users showed significantly increased plasma Tyr transaminase activity, and significantly decreased plasma Tyr and Tyr/LNAA levels at mid-cycle and luteal phase, whereas plasma total 3-methoxy-4hydroxyphenylglycol (MHPG) was not affected. Following an oral protein load, the area under the curve in plasma of Tyr and Tyr/LNAA in OC users at the luteal phase were 43 % and 29 %, respectively, of control levels. The results suggest that the decreased Tyr availability to the brain in OC users may result in a substratelimited reduction of brain noradrenaline formation, which, secondarily, may contribute to disturbances of mood, coping mechanisms, and appetite in susceptible subjects." @default.
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- W1976647510 date "1995-01-01" @default.
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- W1976647510 title "Tyrosine metabolism in users of oral contraceptives" @default.
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- W1976647510 doi "https://doi.org/10.1016/0024-3205(94)00502-j" @default.
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