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Elevated IL-5 levels in pleural fluid of patients with paragonimiasis westermani

H Taniguchi1, H Mukae, N Matsumoto

  • 1Third Department of Internal Medicine, Miyazaki Medical College, Miyazaki, Japan.

Clinical and Experimental Immunology
|February 13, 2001
PubMed

Insights

Interleukin-5 (IL-5) is key in causing eosinophilic pleural effusion in paragonimiasis. This study found high IL-5 levels in patients with Paragonimus westermani infection, correlating with eosinophilia.

Area of Science:

  • Immunology
  • Parasitology
  • Pulmonology

Background:

  • Eosinophilic pleural effusion is a rare condition.
  • Paragonimiasis, a parasitic lung infection, can cause eosinophilic pleural effusion.
  • The exact pathogenic mechanisms are not fully understood.

Purpose of the Study:

  • To investigate the role of specific cytokines in the pathogenesis of eosinophilic pleural effusion in paragonimiasis.
  • To compare cytokine levels in paragonimiasis patients with other causes of pleural effusion.

Main Methods:

  • Measurement of IL-5, GM-CSF, and IFN-gamma levels in pleural effusions.
  • Analysis of samples from 11 paragonimiasis patients and control groups (pleural transudates, tuberculous pleurisy, empyema, lung cancer).
  • Correlation analysis between cytokine levels and eosinophil counts.

Main Results:

  • Paragonimiasis patients exhibited significant peripheral blood and pleural fluid eosinophilia.
  • IL-5 concentrations were markedly higher in paragonimiasis pleural effusions compared to other groups.
  • IL-5 levels correlated with eosinophil percentages in paragonimiasis patients, unlike GM-CSF and IFN-gamma.

Conclusions:

  • Interleukin-5 (IL-5) plays a crucial role in mediating eosinophilia in the pleural effusion of paragonimiasis patients.
  • IL-5 appears to be the primary driver of eosinophilic inflammation in this condition.
  • Further research into IL-5 targeted therapies may be beneficial for managing paragonimiasis-induced pleural effusion.

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