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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.
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Submitted February 19, 2004
Accepted November 3, 2004
A role for bone marrow-derived cells in the vasculature of non-injured CNS
Francesco Galimi, Robert G Summers, Henriette van Praag, Inder M Verma, and Fred H Gage*
Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA; Dept. of Biomedical Sciences/INBB, University of Sassari Medical School, Sassari, Italy
Laboratory of Genetics, The Salk Institute for Biological Studies, La Jolla, California, USA
* Corresponding author; email: gage{at}salk.edu.
The contribution of hematopoietic cells to the formation of blood vessels is currently the focus of intense scrutiny. Bone marrow-derived endothelial progenitor cells are thought to generate endothelial cells in many tissues, including myocardium, muscle, and certain tumors. In the central nervous system, however, the possible role of bone marrow-derived angiocompetent cells remains unclear. Here we have investigated the long-term involvement of bone marrow-derived cells in the maintenance of endothelial structures in the brain, spinal cord, and retina. Using hematopoietic chimeras stably expressing GFP in bone marrow-derived 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 marrow-derived, vasculature-associated cells in the non-injured adult CNS are distinct from endothelial cells, but play an active role in vascular structures.

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