Published ahead of print on June 16, 2005, doi:10.1165/rcmb.2005-0129OC
American Journal of Respiratory Cell and Molecular Biology. Vol. 33, pp. 335-342, 2005
© 2005 American Thoracic Society DOI: 10.1165/rcmb.2005-0129OC
Evidence that Bone Marrow Cells Do Not Contribute to the Alveolar Epithelium
Jacqueline C. Chang,
Ross Summer,
Xi Sun,
Kathleen Fitzsimmons and
Alan Fine
The Pulmonary Center, Boston University School of Medicine, Boston, Massachusetts
Correspondence and requests for reprints should be addressed to Jacqueline C. Chang, The Pulmonary Center, Boston University School of Medicine, 715 Albany Street, Boston, MA 02118. E-mail: jachang{at}lung.bumc.bu.edu
An ongoing controversy is the role of marrow cells in populating the alveolar epithelium. In this study, we employed flow cytometry and histologic techniques to evaluate this process. Donor bone marrow was harvested from transgenic mice expressing the LacZ or eGFP gene ubiquitously, or under the control of the human surfactant protein (SP)-C promoter, and transplanted into lethally irradiated, neonatal mice. In recipients transplanted with marrow that express eGFP or lacZ ubiquitously, light microscopy revealed cells whose morphology and location were compatible with a type II cell phenotype. Consistent with this, fluorescent microscopy suggested colocalization of eGFP and proSP-C proteins in single cells. In mice transplanted with SP-CeGFP marrow, engraftment was not detectable by histology or flow cytometry. We therefore used deconvolution microscopy to reanalyze histologic sections that were thought to show marrow-derived type II cells. We found that all putative marrow-derived pneumocytes resulted from the overlapping fluorescent signals of an endogenous proSP-C+ type II cell and a donor-derived eGFP+ cell. Taken together, our observations underscore the technical difficulties associated with evaluating engraftment in lung, and argue against a contributory role for marrow cells in populating the alveolar epithelium.
Key Words: bone marrow engraftment type II cell stem cell
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