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Reduced antibody responses after immunization in rat lung transplants
J B Winter1, M Groen, A H Petersen
1Cardiopulmonary Surgery Research Division, University Hospital Groningen, The Netherlands.
The American Review of Respiratory Disease
|March 1, 1993
Summary
Antibody responses in lung transplant recipients are temporarily impaired, especially early after surgery. Immune function recovers by 28 days post-transplant, indicating a window of vulnerability for lung transplant recipients.
Area of Science:
- Immunology
- Transplantation Biology
- Pulmonary Medicine
Background:
- Pulmonary infections are common in lung transplant recipients.
- This suggests potential impairment of the lung's defense system after transplantation.
Purpose of the Study:
- To investigate antibody responses to intrapulmonary antigens in rats after lung transplantation.
- To determine the time course of immune function recovery post-transplant.
Main Methods:
- Four groups of rats: normal, sham-operated, syngeneic lung transplant, and allogeneic lung transplant.
- Immunosuppression with cyclosporine was administered.
- Sheep red blood cells were injected into the left lung bronchus at various time points post-operation.
- Serum antibody titers were measured using a hemolysis assay.
Main Results:
- No antibody response was detected 7 days post-transplant or in sham-operated rats.
- Responses returned to normal in sham-operated rats by Day 14.
- Transplanted rats showed impaired antibody responses up to Day 14.
- Near-normal antibody responses were observed in all groups by Day 28 and persisted for 6 months.
Conclusions:
- Lung transplantation temporarily impairs the ability to mount antibody responses to intrapulmonary antigens.
- Immune function, specifically antibody production, recovers by approximately 28 days post-transplantation.
- These findings highlight a critical period of reduced immune defense in early lung transplant recipients.