title: Utilizing X-irradiation to selectively eliminate neural stem/progenitor cells from neurogenic regions of the mammalian brain.
abstract: Neural stem/progenitor cells residing in the mammalian CNS provide a potential endogenous source for replenishing neurons that are lost due to aging, trauma or disease. However, little is known about their functional potential due to the lack of methodologies that allow for the reproducible alteration of stem cell numbers in vivo. Accordingly, we describe a methodology that utilizes targeted X-irradiation to experimentally generate neural stem/progenitor cell-depleted rat models. We show that, by virtue of their mitotic activity, proliferating neural stem/progenitor cells can be selectively eliminated from either the subventricular zone (SVZ) or dentate gyrus of a rat by treating it to an (unilateral or bilateral) exposure of X-irradiation. Utilizing BrdU incorporation, it was found that a single 15 gray (Gy) exposure to the SVZ resulted in the elimination of 85% of the proliferating cell population for up to 3 months. Immunohistochemistry, ultrastructural analysis and proteomics were employed to confirm that the cells eliminated following X-irradiation were neural stem/progenitor cells. Similar depletions of the stem/progenitor cell population in the dentate gyrus were achieved by targeting the hippocampus with a single 15Gy exposure. The reproducibility, versatility and ease of generation make these experimental animal models a valuable tool to aid in our understanding of the properties and functions of neural stem/progenitor cells.
authors.affiliation: Department of Anatomy and Neurobiology, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA.
authors.forename: Melissa J
authors.initials: MJ
authors.lastname: McGinn
authors.forename: Dong
authors.initials: D
authors.lastname: Sun
authors.forename: Raymond J
authors.initials: RJ
authors.lastname: Colello
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001921:Brain / Q000166:cytology* / Q000528:radiation effects*; D001973:Bromodeoxyuridine; D002552:Cerebral Ventricles / Q000166:cytology / Q000528:radiation effects / Q000648:ultrastructure; D018891:Dentate Gyrus / Q000166:cytology / Q000528:radiation effects / Q000648:ultrastructure; D006624:Hippocampus / Q000166:cytology / Q000528:radiation effects; D007150:Immunohistochemistry; D007381:Intermediate Filament Proteins / Q000378:metabolism; D008938:Mitosis / Q000187:drug effects; D009419:Nerve Tissue Proteins / Q000378:metabolism; D064231:Nestin; D009474:Neurons / Q000528:radiation effects* / Q000648:ultrastructure; D040901:Proteomics; D011838:Radiation-Sensitizing Agents; D051381:Rats; D015203:Reproducibility of Results; D013234:Stem Cells / Q000528:radiation effects* / Q000648:ultrastructure; D014965:X-Rays
chemical_list: D007381:Intermediate Filament Proteins; D009419:Nerve Tissue Proteins; C577486:Nes protein, rat; D064231:Nestin; D011838:Radiation-Sensitizing Agents; D001973:Bromodeoxyuridine