Differential mechanisms of induction of ornithine decarboxylase in rat intestine by L- and D-amino acids.
A single intragastric administration of glycine, L- and D-alanine, and L-and D-serine into rats resulted in a more than 20-fold stimulation of intestinal mucosal ornithine decarboxylase (ODC) within 4 h. The stimulation of ODC activity was accompanied by an increase in the amount of immunoreactive ODC protein. The induction of ODC by D-amino acids was in all likelihood attributable to an enhanced accumulation of ODC-specific mRNA species as revealed by Northern blot and dot-blot hybridization analyses. However, the induction by glycine and L-amino acids was not explainable by changes of mRNA since the changes in mRNA contents were only marginal. Since the turnover rates of L-serine-induced and D-serine-induced intestinal ODC protein were the same as the non-induced control, we concluded that the induction by glycine and L-amino acids was brought about by an increased efficiency of translation of the ODC message.
Miyamoto
K
K
Department of Nutrition, School of Medicine, University of Tokushima, Japan.
Oka
T
T
Fujii
T
T
Matsubara
T
T
Minami
H
H
Nakabou
Y
Y
Natori
Y
Y
Hagihira
H
H
D000596:Amino Acids / Q000494:pharmacology*; D000818:Animals; D004790:Enzyme Induction / Q000187:drug effects; D007413:Intestinal Mucosa / Q000201:enzymology*; D008297:Male; D009955:Ornithine Decarboxylase / Q000096:biosynthesis* / Q000187:drug effects / Q000235:genetics; D012333:RNA, Messenger / Q000187:drug effects; D051381:Rats; D011919:Rats, Inbred Strains; D013237:Stereoisomerism
D000596:Amino Acids; D012333:RNA, Messenger; D009955:Ornithine Decarboxylase