The autoimmunity of primary biliary cirrhosis and the clonal selection theory

Carlo Selmi, Ian R. MacKay, M. Eric Gershwin

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Primary biliary cirrhosis (PBC) is a chronic cholestatic liver disease in which an immune-mediated injury targets the small intrahepatic bile ducts. PBC is further characterized by highly specific serum antimitochondrial autoantibodies (AMAs) and autoreactive T cells, a striking female predominance, a strong genetic susceptibility and a plethora of candidate environmental factors to trigger the disease onset. For these reasons, PBC appears ideal to represent the developments of the clonal selection theory over the past decades. First, a sufficiently potent autoimmunogenic stimulus in PBC would require the coexistence of numerous pre-existing conditions (mostly genetic, as recently illustrated by genome-wide association studies and animal models) to perpetuate the destruction of the biliary epithelium by the immune system via the persistence of forbidden clones. Second, the proposed modifications of mitochondrial autoantigens caused by infectious agents and/or xenobiotics well illustrate the possibility that peculiar changes in the antigen structure and flexibility may contribute to tolerance breakdown. Third, the unique apoptotic features shown for cholangiocytes are the ideal setting for the development of mitochondrial autoantigen presentation to the immune system through macrophages and AMA; thus, turning the non-traditional mitochondrial antigen into a traditional one. This article will review the current knowledge on PBC etiology and pathogenesis in light of the clonal selection theory developments.

Original languageEnglish (US)
Pages (from-to)70-80
Number of pages11
JournalImmunology and Cell Biology
Volume89
Issue number1
DOIs
StatePublished - Jan 2011

Keywords

  • antimitochondrial antibodies
  • autoimmunity
  • environmental factors
  • thymic selection
  • tolerance

ASJC Scopus subject areas

  • Immunology
  • Cell Biology

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