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. 1997 Jul-Aug;70(4):323–330.

Hepatic protoporphyrin metabolism in patients with advanced protoporphyric liver disease.

J R Bloomer 1
PMCID: PMC2589331  PMID: 9626752

Abstract

Protoporphyria is a genetic disorder in which liver damage is caused by the toxic effect of protoporphyrin accumulation in the liver. In this study protoporphyrin was measured in the resected livers of 7 patients who had liver transplantation and an additional patient from whom liver tissue was obtained post mortem. Comparison of liver, erythrocyte and serum protoporphyrin levels demonstrated a marked gradient between these compartments: erythrocyte, 5781 +/- 655 micrograms/dl; serum, 384 +/- 102 micrograms/dl; liver 377,238 +/- 55,568 micrograms/100 gm wet weight, (mean +/- SE). Protoporphyrin levels in bile of 3 patients were 55,559, and 1,153 micrograms/dl, indicating a gradient between liver and bile as well. Examination of the livers by polarization microscopy and electron microscopy demonstrated protoporphyrin pigment crystals. In one patient who had recurrent liver disease after transplantation, the protoporphyrin concentration in the graft at the time of death was similar to that in the resected liver. These data indicate that liver protoporphyrin levels in patients with advanced protoporphyric liver disease are much higher than levels in blood and bile, in part because protoporphyrin forms crystalline deposits in liver tissue. Thus, progressive hepatic accumulation of protoporphyrin occurs in the face of impaired biliary excretion. An intrinsic defect in hepatic excretion of protoporphyrin is probably not necessary for this condition to develop because liver disease can occur in the graft following transplantation.

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Selected References

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