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We investigated the serum level of macrophage colony stimulating factor in acute and chronic liver disease. Levels of macrophage colony stimulating factor (mean +/- SD, ng/ml) were significantly higher in acute hepatitis (5.67 +/- 1.01, p < 0.01) and chronic active hepatitis (3.34 +/- 1.19, p < 0.01) than in healthy volunteers (1.90 +/- 0.25), asymptomatic hepatitis B virus carriers (1.98 +/- 0.40), and chronic persistent hepatitis (2.34 +/- 0.43). Levels of macrophage colony stimulating factor showed a highly significant correlation with the serum alanine aminotransferase levels in acute hepatitis (p < 0.01, rs = 0.903) and in chronic active hepatis (p < 0.01, rs = 0.672). Levels of macrophage colony stimulating factor in patients with cirrhosis (cirrhosis; 3.11 +/- 0.93 and hepatocellular carcinoma; 3.30 +/- 0.74) were significantly higher than in patients with chronic persistent hepatitis although the alanine aminotransferase levels were not significantly different. In cirrhosis, levels of macrophage colony stimulating factor correlated positively with the serum alanine aminotransferase levels (p < 0.05), total bilirubin levels (p < 0.05), and indocyanine green clearance (p < 0.05). An immunohistochemical study showed an increased number of macrophage colony stimulating factor positive mononuclear cells in portal areas in acute hepatitis. Our findings suggest that; (a) the serum levels of macrophage colony stimulating factor represent ongoing hepatocellular necrosis in acute and chronic liver disease, (b) the source of the increase in the serum macrophage colony stimulating factor levels in hepatic inflammation may be, in part, its production by infiltrating mononuclear cells in the liver, and (c) cirrhosis also causes elevated serum levels of macrophage colony stimulating factor.
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