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Blood, 15 March 2005, Vol. 105, No. 6, pp. 2400-2402. Prepublished online as a Blood First Edition Paper on November 30, 2004; DOI 10.1182/blood-2004-02-0612.
HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY A role for bone marrowderived cells in the vasculature of noninjured CNSFrom the Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, CA; and the Department of Biomedical Sciences/Instituto Nazionale di Biostrutture e Biosistemi, University of Sassari Medical School, Sassari, Italy.
The contribution of hematopoietic cells to the formation of blood vessels is currently the focus of intense scrutiny. Bone marrowderived endothelial progenitor cells are thought to generate endothelial cells in many tissues, including myocardium, muscle, and certain tumors. In the central nervous system (CNS), however, the possible role of bone marrowderived angiocompetent cells remains unclear. Here we have investigated the long-term involvement of bone marrowderived cells in the maintenance of endothelial structures in the brain, spinal cord, and retina. Using hematopoietic chimeras stably expressing green fluorescent protein (GFP) in bone marrowderived tissues, we found large numbers of hematopoietic cells closely associated with vessels in the CNS. None of these cells, however, showed an endothelial phenotype. They were positive for monocytic and microglial surface markers and demonstrated active phagocytosis of neighboring endothelial elements. Bone marrowderived, vasculature-associated cells in the noninjured adult CNS are distinct from endothelial cells, but play an active role in vascular structures.
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