Developmental changes in mouse brain polyamine metabolism.
Mouse brain ornithine decarboxylase (ODC) activity is high at the time of birth, whereas S-adenosyl-L-methionine decarboxylase (SAM-DC) activity is low. ODC activity, and putrescine, spermidine and spermine concentrations decline rapidly during postnatal development to the low level characteristic of mature brains, while SAM-DC activity behaves in the opposite manner. The fluctuations in mouse brain polyamine metabolism are in accord with those found in the rat. The apparent Km values of ODC and SAM-DC for their substrates decline parallel with the decrease of substrate and product concentrations during ontogeny suggesting substrate and/or product dependent regulation of polyamine synthesis in the developing brain.
D012437:Adenosylmethionine Decarboxylase / Q000378:metabolism*; D000375:Aging; D000818:Animals; D001921:Brain / Q000254:growth & development* / Q000378:metabolism; D002262:Carboxy-Lyases / Q000378:metabolism*; D007700:Kinetics; D051379:Mice; D008815:Mice, Inbred Strains; D009955:Ornithine Decarboxylase / Q000378:metabolism*; D011073:Polyamines / Q000378:metabolism*; D011700:Putrescine / Q000378:metabolism; D013095:Spermidine / Q000378:metabolism; D013096:Spermine / Q000378:metabolism
D011073:Polyamines; D013096:Spermine; D002262:Carboxy-Lyases; D009955:Ornithine Decarboxylase; D012437:Adenosylmethionine Decarboxylase; D013095:Spermidine; D011700:Putrescine