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The Pulmonary Center, Boston University School of Medicine, Boston, Massachusetts 02118
Although the function of the cell surface protein stem cell antigen-1 (Sca-1) has not been identified, expression of this molecule is a characteristic of bone marrow-derived hematopoietic stem cell populations. Expression of Sca-1, however, is not restricted to hematopoietic tissue. By RT-PCR and Western analysis, we found that Sca-1 is expressed in the adult mouse lung. Sca-1 immunohistochemistry revealed a linear staining pattern on the endothelial surface of large and small pulmonary arteries and veins and alveolar capillaries. Expression of Sca-1 in the pulmonary endothelium was confirmed by dual fluorescent microscopy on lung sections and by fluorescence-activated cell sorting analysis of digested lung tissue; each of these methods showed colocalization with the endothelial marker platelet/endothelial cell adhesion molecule-1. In the kidney, Sca-1 expression was also noted in large vessels, but, in contrast to the lung, was not observed in capillaries. Overall, our data indicate that Sca-1 expression helps define the surface phenotype of endothelial cells throughout the pulmonary vasculature.
lung; endothelial cell marker
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