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What causes sarcoidosis?

David R Moller1, Edward S Chen

  • 1Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Current Opinion in Pulmonary Medicine
|August 13, 2002
PubMed
Summary
This summary is machine-generated.

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Recent studies suggest sarcoidosis (a complex inflammatory disease) may stem from genetically predisposed individuals mounting an enhanced immune response to specific microbial pathogens, rather than environmental factors.

Area of Science:

  • Immunology
  • Epidemiology
  • Molecular Biology

Background:

  • Sarcoidosis etiology remains incompletely understood despite recent research.
  • Previous studies indicated limited roles for environmental or occupational exposures.
  • Emerging evidence links infectious agents to sarcoidosis development.

Purpose of the Study:

  • To synthesize current understanding of sarcoidosis etiology.
  • To evaluate the roles of environmental, infectious, and immune factors.
  • To explore the genetic basis of sarcoidosis pathogenesis.

Main Methods:

  • Review of recent epidemiologic, immunologic, and molecular biologic studies.
  • Analysis of findings from a US multicenter sarcoidosis study.
  • Correlation of sarcoidosis association with Th1-promoting therapies.

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Main Results:

  • Few environmental or occupational exposures were significantly associated with sarcoidosis risk.
  • Mycobacterial and propionibacterial organisms have been linked to sarcoidosis.
  • Association with Th1-promoting biologic response modifiers supports a role for enhanced Th1 immunity.

Conclusions:

  • Systemic sarcoidosis etiology likely involves genetically determined enhanced Th1 immune responses.
  • These responses are likely directed against a limited set of microbial pathogens.
  • Noninfectious environmental exposures appear to play a minimal role.