J Korean Med Sci.  1999 Oct;14(5):531-538. 10.3346/jkms.1999.14.5.531.

Transforming growth factor-beta1 protein, proliferation and apoptosis of oval cells in acetylaminofluorene-induced rat liver regeneration

• Park DY
• Suh KS

• KMID: 646021
• DOI: http://doi.org/10.3346/jkms.1999.14.5.531

Abstract

Administering of 2-acetylaminofluorene (2-AAF) before a two-thirds partial hepatectomy (PHx) results in suppression of hepatocyte proliferation and stimulation of oval cell proliferation. The objectives of this study was to examine the oval cell behaviour and associated transforming growth factor-beta1 (TGF-beta1) protein expression by combining 2-AAF with selective hepatic damage caused by PHx. We also studied the temporal relationship between TGF-beta1 expression, and proliferation and apoptosis of oval cells. Oval cells emerged from the portal areas and became more numerous with time fanning out into the periportal and midzonal hepatic parenchyma. Both smooth muscle actin (SMA) and TGF-beta1 immunostain revealed that TGF-beta1-positive cells were SMA-positive hepatic stellate cells (HSCs). Coinciding with the proliferation of oval cells, an increase expression of TGF-beta1 produced by SMA-positive HSCs was observed, thereafter apoptosis of oval cells reached its peak. This result implicated that TGF-beta1 produced by HSCs is intimately associated with proliferation and apoptosis of oval cells, and plays a role in the cessation of oval cell activation and remodeling of liver parenchyma in 2-AAF induced liver regeneration.

Keyword

Transforming growth factor beta; Cells, oval; Apoptosis; Immunohistochemistry

MeSH Terms

2-Acetylaminofluorene
Animal
Apoptosis/physiology*
Hepatectomy
Immunohistochemistry
In Situ Nick-End Labeling
Liver/ultrastructure
Liver/metabolism*
Liver/cytology
Liver Regeneration/physiology*
Liver Regeneration/drug effects
Male
Rats
Rats, Sprague-Dawley
Transforming Growth Factor beta/metabolism*