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Related Experiment Videos

Extracellular phospholipase A2 expression in sarcoidosis

S Andersen1, L Bjermer, P K Selbo

  • 1UNIGEN Centre for Molecular Biology, University of Trondheim, Norway.

Sarcoidosis, Vasculitis, and Diffuse Lung Diseases : Official Journal of WASOG
|March 1, 1996
PubMed
Summary

Elevated levels of non-pancreatic phospholipase A2 (npPLA2) are linked to sarcoidosis. This enzyme accumulates in lung tissue, suggesting a key role in the disease

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Area of Science:

  • Biochemistry
  • Immunology
  • Pulmonology

Background:

  • Sarcoidosis is a multisystem inflammatory disease of unknown etiology.
  • The role of specific enzymes in sarcoidosis pathophysiology requires further elucidation.
  • Calcium-dependent secretory non-pancreatic phospholipase A2 (npPLA2) is a potential mediator.

Purpose of the Study:

  • To investigate the role of npPLA2 in the pathophysiology of sarcoidosis.
  • To quantify npPLA2 levels in patients with sarcoidosis.
  • To examine the localization and expression of npPLA2 in lung tissue.

Main Methods:

  • Serum samples from 24 sarcoidosis patients and controls were analyzed for npPLA2 levels.
  • Bronchoscopy with bronchoalveolar lavage (BAL) and transbronchial lung biopsies (TBL) were performed on patients.

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  • Immunohistochemistry and in situ hybridization were used to detect npPLA2 and its mRNA in lung tissues.

    • Main Results:

    • Serum npPLA2 levels were significantly higher in sarcoidosis patients compared to controls (p < 0.001).
    • Lower npPLA2 levels were observed in patients with stable/inactive disease or on corticosteroid treatment.
    • npPLA2 accumulated in lung smooth muscle tissue associated with fibroblasts and collagen deposition.
    • npPLA2-mRNA was detected in fibroblasts surrounding granulomas in lung biopsies.

    Conclusions:

    • npPLA2 is significantly elevated in the serum of sarcoidosis patients.
    • npPLA2 appears to be actively involved in the fibrotic processes within the lungs of sarcoidosis patients.
    • These findings suggest npPLA2 is a key player in sarcoidosis pathophysiology.