Timing of appearance of late oligodendrocyte progenitors coincides with enhanced susceptibility of preterm rabbit cerebral white matter to hypoxia-ischemia

Joshua R. Buser, Kristen N. Segovia, Justin M. Dean, Kerst Nelson, Douglas Beardsley, Xi Gong, Ning Ling Luo, Jennifer Ren, Ying Wan, Art Riddle, Melissa M. McClure, Xinhai Ji, Matthew Derrick, A. Roger Hohimer, Stephen A. Back, Sidharthas Tan

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

Emerging evidence supports that premature infants are susceptible to both cerebral white and gray matter injury. In a fetal rabbit model of placental insufficiency, preterm rabbits at embryonic day 22 (E22) exhibited histologic evidence of gray matter injury but minimal white matter injury after global hypoxia-ischemia (H-I). We hypothesized that the dissociation between susceptibility to gray and white matter injury at E22 was related to the timing of appearance of late oligodendrocyte progenitors (preOLs) that are particularly vulnerable in preterm human white matter lesions. During normal rabbit oligodendrocyte (OL) lineage progression, early OL progenitors predominated at E22. PreOL density increased between E24 and E25 in major forebrain white matter tracts. After H-I at E22 and E25, we observed a similar magnitude of cerebral H-I, assessed by cortical microvascular blood flow, and gray matter injury, assessed by caspase activation. However, the increased preOL density at E25 was accompanied by a significant increase in acute white matter injury after H-I that coincided with enhanced preOL degeneration. At E29, significant white matter atrophy developed after H-I at E25 but not E22. Thus, the timing of appearance of preOLs coincided with onset of a developmental window of enhanced white but not gray matter susceptibility to H-I.

Original languageEnglish (US)
Pages (from-to)1053-1065
Number of pages13
JournalJournal of Cerebral Blood Flow and Metabolism
Volume30
Issue number5
DOIs
StatePublished - May 1 2010

Keywords

  • Fetal rabbit
  • Hypoxia-ischemia
  • Oligodendrocyte
  • White matter injury

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

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  • Cite this

    Buser, J. R., Segovia, K. N., Dean, J. M., Nelson, K., Beardsley, D., Gong, X., Luo, N. L., Ren, J., Wan, Y., Riddle, A., McClure, M. M., Ji, X., Derrick, M., Hohimer, A. R., Back, S. A., & Tan, S. (2010). Timing of appearance of late oligodendrocyte progenitors coincides with enhanced susceptibility of preterm rabbit cerebral white matter to hypoxia-ischemia. Journal of Cerebral Blood Flow and Metabolism, 30(5), 1053-1065. https://doi.org/10.1038/jcbfm.2009.286