Two waves of oligodendrogenesis in the ventricular zone of the spinal cord (SC-VZ) during rat development, which take place between embryonic days 14 and 18 (E14-E18) and E20-E21, have been described. In the VZ of the brain, unlike the SC-VZ, a third wave of oligodendrogenesis occurs during the first weeks of postnatal development. Using immunofluorescence staining of intact rat SC tissue, we noticed the presence of small numbers of Olig2(+) /Sox-10(+) cells inside the lining of the central canal (CC) during postnatal development and adulthood. Olig2(+) /Sox-10(+) cells appeared inside the lining of the CC shortly after birth, and their number reached a maximum of approximately 0.65 ± 0.14 cell/40-μm section during the second postnatal week. After the latter development, the number of Olig2(+) /Sox-10(+) cells decreased to 0.21 ± 0.07 (P36) and 0.18 ± 0.1 cell/section (P120). At P21, Olig2(+) /Sox-10(+) cells inside the CC lining started to express other oligodendroglial markers such as CNPase, RIP, and APC. Olig2(+) /Sox-10(+) cells usually did not proliferate inside the CC lining and were only rarely found to be immunoreactive against oligodendrocyte progenitor markers such as NG2 or PDGFRα. Using 5-bromo-2-deoxyuridine administration at P2, P11, P22, or P120-P125, we revealed that these cells arose in the CC lining during postnatal development and adulthood. Our findings confirmed that the CC lining is the source of a small number of cells with an oligodendroglial phenotype during postnatal development and adulthood in the SC of intact rats.
Pubmed ID: 24659141 RIS Download
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