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Defective cellular immunity to gram-negative bacteria in cystic fibrosis patients
Insights
Cystic fibrosis patients with advanced disease show impaired in vitro lymphocyte responses to gram-negative bacteria like Pseudomonas aeruginosa. This unresponsiveness extends to Klebsiella, Serratia, and Proteus, but not Staphylococcus aureus, suggesting a specific lymphocyte subpopulation defect.
Area of Science:
- Immunology
- Microbiology
- Genetics
Background:
- Cystic fibrosis (CF) is a genetic disorder affecting multiple organs.
- Impaired immune responses are observed in CF patients, particularly with advanced disease.
- Previous studies indicated reduced in vitro lymphocyte reactivity to Pseudomonas aeruginosa in CF.
Purpose of the Study:
- To investigate in vitro lymphocyte responses to other gram-negative bacteria in cystic fibrosis patients.
- To compare immune responses in CF patients with advanced disease to normal individuals.
- To determine if specific bacterial species elicit differential lymphocyte responses in CF.
Main Methods:
- In vitro lymphocyte proliferation assays were performed.
- Cystic fibrosis patients with advanced clinical disease and healthy controls were studied.
- Lymphocyte responses to Klebsiella pneumoniae, Serratia marcescens, Proteus mirabilis, and Staphylococcus aureus were assessed.
Main Results:
- CF patients unresponsive to Pseudomonas aeruginosa also showed unresponsiveness to Klebsiella pneumoniae, Serratia marcescens, and Proteus mirabilis.
- Lymphocyte responsiveness to Staphylococcus aureus was not impaired in CF patients.
- A consistent pattern of unresponsiveness to several gram-negative bacteria was observed in CF patients.
Conclusions:
- In vitro lymphocyte responses to multiple gram-negative bacteria may be impaired in advanced cystic fibrosis.
- The findings suggest a potential defect in a specific lymphocyte subpopulation in some CF patients.
- This impairment may contribute to increased susceptibility to bacterial infections in cystic fibrosis.
Abstract:
In vitro lymphocyte responses to Pseudomonas aeruginosa have been found to be impaired in cystic fibrosis patients with advanced clinical disease. The responses to Klebsiella pneumoniae, Serratia marcescens, and Proteus mirabilis were studied in a similar group of cystic fibrosis patients and normal individuals. Cystic fibrosis patients found to be unresponsive to pseudomonas were also unresponsive to klebsiella, serratia, and proteus. Responsiveness to Staphylococcus aureus was not impaired in cystic fibrosis patients. We postulate that in vitro lymphocyte responses to several gram-negative bacteria require the function of a lymphocyte subpopulation which may be impaired in some cystic fibrosis patients.