Immunologic studies in patients with recurrent bronchopulmonary infections

Area of Science:

• Immunology
• Pulmonology
• Infectious Diseases

Background:

• Immune deficiency disorders are linked to respiratory tract infections.
• Investigating immunologic parameters in patients with recurrent bronchopulmonary infections is crucial.

Purpose of the Study:

• To investigate various immunologic parameters in patients experiencing recurrent bronchopulmonary infections.
• To identify potential immune system dysfunctions contributing to respiratory infections.

Main Methods:

• Assessed neutrophil function (intracellular killing, chemotaxis).
• Measured complement 3c levels and total hemolytic complement activity.
• Evaluated serum immunoglobulin concentrations, alpha1-antitrypsin levels, and cutaneous anergy.
• Analyzed lymphocyte response to phytohemagglutinin and presence of blocking factors and lymphocytotoxins.

Main Results:

• Neutrophil function and complement 3c levels were normal.
• Defective total hemolytic complement activity was observed in one patient.
• Elevated serum immunoglobulin concentrations were noted in some patients.
• Severe alpha1-antitrypsin deficiency (Pi ZZ phenotype) was found in one patient.
• Cutaneous anergy was present in three patients, but in vitro lymphocyte responses were normal.
• A serum blocking factor affecting Candida antigen response was found in three patients.
• 'Cold' lymphocytotoxins were detected in 10 patients, compared to 3 controls.

Conclusions:

• While some immune parameters were normal, specific abnormalities like defective complement activity, blocking factors, and lymphocytotoxins were identified in patients with recurrent bronchopulmonary infections.
• These findings may have pathogenetic relevance in a subset of patients, warranting further investigation.
• The study highlights potential immune dysfunctions contributing to chronic respiratory infections.