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Open Access Effects of Myeloablation, Peripheral Chimerism, and Whole-Body Irradiation on the Entry of Bone Marrow-Derived Cells Into the Brain

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Understanding how bone marrow-derived cells (BMDCs) enter the central nervous system (CNS) is critical for the development of therapies for brain-related disorders using hematopoietic stem cells. We investigated the brain damages and blood‐brain barrier (BBB) modification following either whole-body irradiation or a myeloablative chemotherapy regimen in mice, and the capacity for these treatments to induce the entry of BMDCs into the CNS. Neither treatment had a lasting effect on brain integrity and both were equally efficient at achieving myeloablation. Injection of bone marrow cells from green fluorescent protein (GFP) transgenic mice was able to completely repopulate the hematopoietic niche in the circulation and in hematopoietic organs (thymus and spleen). However, GFP+ cells only entered the brain following whole-body irradiation. We conclude that myeloablation, damages to the brain integrity, or the BBB and peripheral chimerism are not responsible for the entry of BMDCs into the CNS following irradiation.

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Keywords: Bone marrow-derived cells; Central nervous sysem (CNS); Chemotherapy; Hematopoietic stem cell; Innate immunity; Irradiation; Microglia; Neuroimmunology

Document Type: Research Article

Affiliations: Laboratory of Endocrinology and Genomics, CHUL Research Center and Department of Molecular Medicine, Faculty of Medicine, Laval University, Qu├ębec, Canada

Publication date: 2012-06-01

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