TY - JOUR
T1 - Colocalization in pericentral hepatocytes in adult mice and similarity in developmental expression pattern of ornithine aminotransferase and glutamine synthetase mRNA
AU - Kuo, Frank C.
AU - Hwu, W. L.
AU - Valle, D.
AU - Darnell, James E.
PY - 1991
Y1 - 1991
N2 - In situ hybridization showed that the mRNA for ornithine aminotransferase (OAT; ornithine-oxo-acid aminotransferase; L-ornithine:2-oxo-acid aminotransferase, EC 2.6.1.13) colocalized with glutamine synthetase [GS; glutamate-ammonia ligase; L-glutamate:ammonia ligase (ADP-forming), EC 6.3.1.2] in pericentral hepatocytes of the adult mouse liver. In addition to an identical distribution in adult hepatocytes, OAT and GS have very similar expression patterns in fetal and neonatal liver. As was earlier described for GS, there is a low level of OAT mRNA in fetal cells and increasing pericentral levels in neonates that reach adult patterns within 2 weeks. These results suggest that the transcriptional regulation of the two genes is similar in the liver. However, there was a lack of colocalization of the mRNAs for the two enzymes in cells of the kidney, intestine, and brain, suggesting different regulatory decisions for the OAT and GS genes in the cells of these different tissues. The metabolic consequences of these localized expression patterns favor ammonia clearance from the blood by the liver and urea synthesis by the kidney.
AB - In situ hybridization showed that the mRNA for ornithine aminotransferase (OAT; ornithine-oxo-acid aminotransferase; L-ornithine:2-oxo-acid aminotransferase, EC 2.6.1.13) colocalized with glutamine synthetase [GS; glutamate-ammonia ligase; L-glutamate:ammonia ligase (ADP-forming), EC 6.3.1.2] in pericentral hepatocytes of the adult mouse liver. In addition to an identical distribution in adult hepatocytes, OAT and GS have very similar expression patterns in fetal and neonatal liver. As was earlier described for GS, there is a low level of OAT mRNA in fetal cells and increasing pericentral levels in neonates that reach adult patterns within 2 weeks. These results suggest that the transcriptional regulation of the two genes is similar in the liver. However, there was a lack of colocalization of the mRNAs for the two enzymes in cells of the kidney, intestine, and brain, suggesting different regulatory decisions for the OAT and GS genes in the cells of these different tissues. The metabolic consequences of these localized expression patterns favor ammonia clearance from the blood by the liver and urea synthesis by the kidney.
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U2 - 10.1073/pnas.88.21.9468
DO - 10.1073/pnas.88.21.9468
M3 - Article
C2 - 1682918
AN - SCOPUS:0026040648
SN - 0027-8424
VL - 88
SP - 9468
EP - 9472
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - 21
ER -