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Mannose-binding lectin does not act as an acute-phase reactant in adults with community-acquired pneumococcal

M Perez-Castellano1, M Peñaranda, A Payeras

  • 1Service of Immunology, Hospital Son Dureta, 07198 Palma de Mallorca, Spain.

Clinical and Experimental Immunology
|August 2, 2006
PubMed

Insights

Mannose-binding lectin (MBL) levels did not correlate with pneumococcal pneumonia severity. However, individuals with the wild-type MBL genotype showed higher MBL levels and an increased risk of developing bacteremia.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Pulmonology

Background:

  • Pneumococcal pneumonia is a significant cause of morbidity and mortality.
  • Mannose-binding lectin (MBL) and C-reactive protein (CRP) are key immune proteins involved in host defense.
  • The precise role of MBL in pneumococcal pneumonia, particularly its function as an acute-phase reactant and its correlation with disease severity, requires further elucidation.

Purpose of the Study:

  • To investigate the role of MBL and CRP in pneumococcal pneumonia.
  • To determine if MBL functions as an acute-phase reactant in this context.
  • To assess the correlation between MBL levels and the severity of pneumococcal pneumonia.

Main Methods:

  • The study included 100 patients diagnosed with pneumococcal pneumonia.
  • Pneumonia severity was assessed using the Fine scale to determine mortality risk.
  • MBL genotypes, MBL levels, and CRP levels were measured during acute and recovery phases.

Main Results:

  • Patients with the wild-type MBL genotype exhibited higher MBL levels in both acute and recovery phases (P < 0.001).
  • Wild-type MBL genotype was associated with an increased risk of bacteremia (OR 2.74, P = 0.02), but not pneumonia severity.
  • CRP levels were elevated in patients with positive blood cultures and in those with underlying diseases, but no correlation was found between MBL and CRP levels or pneumonia severity.

Conclusions:

  • MBL does not appear to act uniformly as an acute-phase reactant in pneumococcal pneumonia.
  • MBL levels do not strongly correlate with the severity of pneumococcal pneumonia.
  • Individuals with the wild-type MBL genotype may have an elevated risk of developing bacteremia during pneumococcal pneumonia.

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