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Mononuclear phagocyte populations in the transplanted human lung
D S Milne1, A D Gascoigne, J Coaker
1University Department of Pathology, Royal Victoria Infirmary, Newcastle-upon-Tyne, United Kingdom.
Transplantation
|September 30, 1998
Summary
Lung transplantation leads to a significant decrease in dendritic cells (DC) and altered alveolar macrophages. These changes, particularly macrophage alterations, may reverse during acute rejection, highlighting the need for further research.
Area of Science:
- Immunology
- Transplantation Science
- Pulmonary Medicine
Background:
- Dendritic cells (DC) are critical for immune responses in alloreactivity.
- Limited data exists on DC and mononuclear cell distribution in human lung transplants.
Purpose of the Study:
- To investigate the distribution and phenotype of dendritic cells (DC) and related mononuclear cells in human lung allografts.
- To assess the impact of lung transplantation and immunosuppression on these cell populations.
Main Methods:
- Analysis of frozen lung sections from transplant recipients and donor lungs.
- Immunohistochemical examination for CD1a+ DC, CD11b, and CD68 expression on mononuclear cells and alveolar macrophages.
- Comparison of biopsy specimens from normal allografts, rejection, and obliterative bronchiolitis.
Main Results:
- A significant depletion of CD1a+ dendritic cells (DC) was observed in all lung allografts, including those with obliterative bronchiolitis.
- Transplantation and immunosuppression reduced coexpression of CD68 and CD11b on alveolar macrophages.
- This reduction in macrophage markers was reversed in cases of acute rejection.
Conclusions:
- Pulmonary dendritic cell (DC) roles and other mononuclear phagocyte functions require further elucidation in lung transplantation.
- Findings from animal models of lung transplantation should be interpreted cautiously due to potential species-specific differences.