Melatonin serum levels and metabolic clearance rate in patients with liver cirrhosis - PubMed (original) (raw)
Melatonin serum levels and metabolic clearance rate in patients with liver cirrhosis
H Iguchi et al. J Clin Endocrinol Metab. 1982 May.
Abstract
To evaluate the influence of changes in liver function on serum levels of melatonin, we measured serum levels and MCR of the hormone in patients with liver cirrhosis and in healthy control subjects. Daytime (0900-1100 h) serum levels of melatonin in patients with liver cirrhosis were significantly elevated compared to those in healthy subjects. Significant positive correlations of the daytime serum levels of melatonin with the serum retention rate of indocyanine green dye and serum levels of total bilirubin were noted. The clearance of melatonin from blood showed a biphasic first-order kinetic pattern. The half-life of each phase was significantly prolonged in patients with cirrhosis compared to healthy subjects. Our data indicate that the elevated daytime serum levels of melatonin in patients with liver cirrhosis are due to decreased clearance, probably related to decreased liver blood flow, lowered activity of 6 beta-hydroxylase, and competition with bilirubin in the intrahepatic transport system.
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