Summary
The expression patterns of the mRNAs for the ammonia-metabolizing enzymes carbamoylphosphate synthetase (CPS), glutamine synthetase (GS) and glutamate dehydrogenase (GDH) were studied in developing pre- and neonatal rat liver byin situ hybridization.
In the period of 11 to 14 embryonic days (ED) the concentrations of GS and GDH mRNA increases rapidly in the liver, whereas a substantial rise of CPS mRNA in the liver does not occur until ED 18. Hepatocyte heterogeneity related to the vascular architecture can first be observed at ED 18 for GS mRNA, at ED 20 for GDH mRNA and three days after birth for CPS mRNA. The adult phenotype is gradually established during the second neonatal week, i.e. GS mRNA becomes confined to a pericentral compartment of one to two hepatocytes thickness, CPS mRNA to a large periportal compartment being no longer expressed in the pericentral compartment and GDH mRNA is expressed over the entire porto-central distance, decreasing in concentration going from central to portal. Comparison of the observed mRNA distribution patterns in the perinatal liver, with published data on the distribution of the respective proteins, points to the occurrence of posttranslational, in addition to pretranslational control mechanisms in the period of ontogenesis of hepatocyte heterogeneity.
Interestingly, during development all three mRNAS are expressed outside the liver to a considerable extent and in a highly specific way, indicating that several organs are involved in the developmentally regulated expression of the mRNAs for the ammonia-metabolizing enzymes, that were hitherto not recognized as such.
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Moorman, A.F.M., De Boer, P.A.J., Das, A.T. et al. Expression patterns of mRNAs for ammoniametabolizing enzymes in the developing rat: the ontogenesis of hepatocyte heterogeneity. Histochem J 22, 457–468 (1990). https://doi.org/10.1007/BF01007229
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DOI: https://doi.org/10.1007/BF01007229