Modulation of keratin 14 and alpha-fetoprotein expression during hepatic oval cell proliferation and liver regeneration

Journal of Cellular Physiology
H C BisgaardS S Thorgeirsson

Abstract

Keratin 14 (K14) expression has recently been demonstrated in cell lines of non-parenchymal hepatic origin (Bisgaard et al., 1993, Mol. Carcinog., 7:60-66; Bisgaard et al., 1991, J. Cell. Physiol., 147:333-343). These cell lines are thought to represent a progeny of a dormant stem cell compartment present in the adult rat liver, which may participate in the restoration of the liver mass after experimental liver injury. Utilizing a combination of 2-acetylaminofluorene (2-AAF) administration and partial hepatectomy to activate liver regeneration by proliferation of oval cells, we examined the modulation of K14 as well as alpha-fetoprotein (AFP) expression in proliferating oval cells and lineages hypothesized to be derived herefrom. We showed by Northern blot and in situ hybridization analyses that K14 and AFP transcripts were initially accumulating in epithelial cells located in subsets of ductal structures in the portal areas. As oval cells infiltrated the liver parenchyma, K14 transcripts were detected in oval cells, in foci of small basophilic hepatocytes, and in structures resembling glandular intestinal-type epithelium. AFP was expressed in oval cells, and at low but detectable levels in foci of basophilic hepatocytes, but n...Continue Reading

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