Morphometric assessment of nucleolar activity in liver cells during the evolutive pathway of chronic hepatitis C to cirrhosis.
Using a computer-assisted image analysis system, we performed a morphometric study of silver-stained nucleoli of hepatocytes in liver biopsy specimens from hepatitis C virus-positive patients with chronic persistent hepatitis (3 cases), chronic active hepatitis (4 cases), and cirrhosis (4 cases). The number and the total area of nucleoli, the average area of each nucleolus and the nuclear area were determined for each of 100 hepatocytes per case. A continuing increase in the area of both nucleoli and nuclei paralleled a progressive decrease in the number of nucleoli during the evolution of chronic hepatitis C to liver cirrhosis. These findings would indicate that the hepatitis C virus-induced liver damage causes reactive changes in surviving hepatocytes resulting in an increased nucleolar biosynthetic activity rather than in an increment of cell proliferation rate. Therefore, the liver response to hepatitis C virus injury seems to be mainly based on a condition of cell "hypertrophy", whereas we previously showed that a process also of compensatory hyperplasia occurs in chronic hepatitis B, possibly resulting from a different pathogenesis of the viral damage.