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Related Experiment Videos

Hepatic protoporphyria is associated with a decrease in ligand binding for the mitochondrial benzodiazepine receptors

L Cantoni1, M Rizzardini, M Skorupska

  • 1Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy.

Biochemical Pharmacology
|September 25, 1992
PubMed
Summary

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Increased liver porphyrins, protoporphyrin IX (PP) and N-methylprotoporphyrin IX (N-MePP), reduce [3H]PK 11195 binding to mitochondrial benzodiazepine receptors (MBRs). This suggests altered MBR function in hepatic protoporphyria.

Area of Science:

  • Biochemistry
  • Neuropharmacology
  • Cell Biology

Background:

  • Mitochondrial benzodiazepine receptors (MBRs) are implicated in various cellular processes.
  • Protoporphyrin IX (PP) and N-methylprotoporphyrin IX (N-MePP) are porphyrins that can accumulate in the liver.
  • The interaction between porphyrins and MBRs is not fully understood.

Purpose of the Study:

  • To investigate the effect of in vivo accumulation of hepatic porphyrins on the binding of [3H]PK 11195 to MBRs.
  • To determine if altered porphyrin levels in protoporphyria affect MBR function in the liver and brain.

Main Methods:

  • In vitro studies using liver membranes to assess the effect of PP and N-MePP on [3H]PK 11195 binding.
  • In vivo induction of protoporphyria in rats using 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC).

Related Experiment Videos

  • Measurement of [3H]PK 11195 binding affinity (Kd) and density (Bmax) in liver and brain homogenates.

    • Main Results:

    • In vitro, PP and N-MePP dose-dependently reduced [3H]PK 11195 affinity for MBRs.
    • In vivo, DDC treatment significantly decreased [3H]PK 11195 affinity and Bmax in rat liver MBRs.
    • No significant changes in MBR binding were observed in the brain cortex.

    Conclusions:

    • DDC-induced accumulation of PP and N-MePP specifically alters MBR binding in the liver.
    • These findings suggest that MBR-modulated processes may be affected in hepatic protoporphyria.
    • The study highlights a potential mechanism for altered cellular function in this condition.