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Antibodies to liver/kidney microsome1 in chronic active hepatitis recognize specific forms of hepatic cytochrome

D J Waxman1, D P Lapenson, M Krishnan

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts.

Gastroenterology
|November 1, 1988
PubMed

Insights

Autoimmune chronic active hepatitis involves antibodies targeting specific liver proteins. Research identifies these autoantibodies as primarily directed against certain forms of cytochrome P-450 enzymes in the liver.

Area of Science:

  • Hepatology
  • Immunology
  • Biochemistry

Background:

  • Autoimmune chronic active hepatitis (CAH) is characterized by autoantibodies against liver antigens.
  • Identifying these antigens is crucial for understanding disease mechanisms.

Purpose of the Study:

  • To identify microsomal antigens targeted by anti-liver/kidney microsome1-positive sera in children with autoimmune CAH.
  • To investigate the relationship between these autoantibodies and hepatic cytochrome P-450 enzymes.

Main Methods:

  • Immunoblot analysis of human and rat liver microsomes.
  • Drug-induced modulation of rat microsomal polypeptide levels.
  • Dot blot analysis using purified rat liver cytochrome P-450 forms.

Main Results:

  • A 48 kDa polypeptide in human microsomes and a 50 kDa polypeptide in rat microsomes were identified.
  • Drug treatment, particularly phenobarbital, suppressed the 50 kDa rat microsomal polypeptide.
  • Anti-liver/kidney microsome1 antibodies selectively recognized methylcholanthrene-inducible rat cytochrome P-450 forms (P-450 BNF-B and P-450 ISF-G).

Conclusions:

  • Autoantibodies in autoimmune CAH are specifically reactive with certain rat hepatic cytochrome P-450 forms.
  • These autoantibodies may target constitutive forms of human liver cytochromes, suggesting a role in autoimmune liver disease pathogenesis.

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