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Sarcoidosis, cancer and molecular mimicry

G Tchernev1, U Wollina

  • 1Policlinic for Dermatology and Venerology, University Hospital Lozenetz, Sofia, Bulgaria.

International Journal of Immunopathology and Pharmacology
|September 27, 2013
PubMed

Insights

Molecular mimicry, potentially driven by oncogene activity, is key to sarcoidosis (a complex inflammatory disease) and its varied symptoms. This phenomenon involves immune responses targeting similar structures, even without exact amino acid matches.

Area of Science:

  • Immunology
  • Oncology
  • Pathogenesis of Sarcoidosis

Background:

  • Sarcoidosis exhibits diverse clinical presentations and immunopathogenesis, strongly linked to molecular mimicry.
  • Molecular mimicry may arise from altered oncogene activity, triggering cross-reactive immune responses against tissue components.
  • This mimicry involves structural similarities between self-peptides and foreign or neoantigens.

Discussion:

  • The reliability of structural analogy between self-tissues and foreign peptides is questioned.
  • Absence of amino acid identity does not preclude molecular mimicry as a cause of sarcoidosis.
  • Mimicry can be mediated by similarities beyond amino acid sequence, including immunological cascade elements and external factors.

Key Insights:

  • Molecular mimicry can occur between peptides with similar antigenic surfaces, irrespective of primary amino acid sequence homology.
  • Structural analogy to de novo tumor antigens is a more probable mechanism than transient imitation for tumor antigen-related mimicry.
  • The role of transient imitation versus structural analogy in molecular mimicry warrants further investigation.

Outlook:

  • Further research is needed to validate or refute the hypothesis of transient imitation in molecular mimicry.
  • Investigating the precise mechanisms of molecular mimicry in sarcoidosis could lead to novel therapeutic targets.
  • Understanding the interplay between oncogenes, molecular mimicry, and sarcoidosis pathogenesis is crucial for future studies.

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