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. 1986 Sep 1;103(3):777–786. doi: 10.1083/jcb.103.3.777

Cellular analysis by in situ hybridization and immunoperoxidase of alpha-fetoprotein and albumin gene expression in rat liver during the perinatal period

PMCID: PMC2114304  PMID: 2427527

Abstract

To analyze at the cellular level the decrease in alpha-fetoprotein (AFP) gene expression during the early postnatal growth, we searched for AFP gene transcripts by in situ hybridization using a specific cDNA probe, and for the corresponding protein by immunocytochemistry, on rat liver sections at various times of the perinatal period. The relative number of mRNA sequences was evaluated by Northern blot analysis. Albumin (ALB) gene expression was studied simultaneously with the same techniques. In 17-19-d-old fetuses all hepatocytes express simultaneously, for both genes, the mRNAs and the corresponding proteins. During the first postnatal weeks, at a time when the global number of AFP mRNA molecules decreases, all hepatocytes still contain cytoplasmic transcripts and protein. A zonal heterogeneity in the level of AFP gene expression develops around the first week, a higher number of gene products being detected in perivenous than in periportal hepatocytes. This heterogeneity persists until the fourth week when AFP mRNA sequences and protein are barely detectable. All hepatocytes express the ALB gene after birth, but at around the second week, a periportal intensification of the in situ hybridization signal and immunostaining becomes apparent. Our data indicate that co-expression of the AFP and ALB genes by all hepatocytes is a normal step in liver ontogeny; the diminution of AFP gene expression after birth is not the result of the disappearance of specialized cell clones; and zonal quantitative differences in the level of AFP and ALB gene expression are observed within the maturing liver lobule.

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Selected References

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