Liver apoptosis

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Abstract

Apoptosis, also called programmed cell death, is a peculiar form of cell death different from cell necrosis in many morphological and biochemical aspects. Like mitosis or differentiation, apoptosis is a normal cell phenomenon which depends on the expression of genes capable of inducing or inhibiting this type of cell destruction. But apoptosis can also be triggered by many external factors and has been described in many diseases. The very different conditions where programmed cell death occurs suggest that the mechanisms leading to the activation of apoptosis-controlling genes are variable. As in other cells, apoptosis occurs in the liver cells, first in the normal state during liver development and then in the adult liver, respectively for liver organogenesis and the renewal of hepatocytes. But apoptosis is also present in various viral, immunological, malignant or drug-induced human liver diseases. In addition, in the animal, hepatocyte apoptosis can be triggered either in vivo or in vitro by many toxic agents. In contrast to other cells, the mechanisms leading to liver cell apoptosis remain poorly investigated. However, two proteins could play an important role in this field, the fas/apo-1 protein present at the surface of hepatocytes and the bcl-2 protein localized in biliary cells. Analysis of the genes controlling the expression of these two proteins could provide essential information on the mechanisms of liver apoptosis.

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