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  • Title: [Creatine biosynthesis enzymes in the postnatal development of rats: the role of cyclo-3',5'-AMP and glucagon in the postnatal induction of liver guanidine acetate-N-methyltransferase].
    Author: Karelin AA.
    Journal: Ontogenez; 1978; 9(2):154-9. PubMed ID: 205820.
    Abstract:
    The activity of enzymes of creatin biosynthesis in the rat liver and kidneys has been studied during the postnatal development. The activity of transamidinase of kidneys (E.C. 2.1.4.1.) increases gradually and linearly up to the 20th day after birth, then decreases on the 12th--25th days and increases again up to the level characteristic of the adult organism. The activity of guanidine acetate-N-methyl transferase (E.C. 2.1.1.2.) is rather high during the first days of postnatal development, then decreases and from the 15th day on increases again attaining the maximal level by the 23rd--25th day. The second period of the increase in the enzyme activity begins on the 29th--30th day of postnatal development. The results obtained suggest that the sharp increase of activity of guanidine acetate-N-methyl transferase of the rat liver during the early postnatal development is realized with the participation of cyclic 3',5'-AMP which appears to mediate the glucagon action.
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