Developmental changes in diffusion anisotropy coincide with immature oligodendrocyte progression and maturation of compound action potential

Alexander Drobyshevsky, Sheng Kwei Song, Georgi Gamkrelidze, Alice M. Wyrwicz, Matthew Derrick, Fan Meng, Limin Li, Xinhai Ji, Barbara Trommer, Douglas J. Beardsley, Ning Ling Luo, Stephen A. Back, Sidhartha Tan

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174 Scopus citations


Disruption of oligodendrocyte lineage progression is implicated in the white-matter injury that occurs in cerebral palsy. We have previously published a model in rabbits consistent with cerebral palsy. Little is known of normal white-matter development in perinatal rabbits. Using a multidimensional approach, we defined the relationship of oligodendrocyte lineage progression and functional maturation of axons to structural development of selected cerebral white-matter tracts as determined by diffusion tensor imaging (DTI). Immunohistochemical studies showed that late oligodendrocyte progenitors appear at gestational age 22 [embryonic day 22 (E22)], whereas immature oligodendrocytes appear at E25, and both increase rapidly with time (∼13 cells/mm2/d) until the onset of myelination. Myelination began at postnatal day 5 (P5) (E36) in the internal capsule (IC) and at P11 in the medial corpus callosum (CC), as determined by localization of sodium channels and myelin basic protein. DTI of the CC and IC showed that fractional anisotropy (FA) increased rapidly between E25 and P1 (E32) (∼11% per day) and plateaued (<5% per day) after the onset of myelination. Postnatal maturation of the compound action potential (CAP) showed a developmental pattern similar to FA, with a rapid rise between E29 and P5 (in the CC, 18% per day) and a slower rise from P5 to P11 (in the CC, <5% per day). The development of immature oligodendrocytes after E29 coincides with changes in FA and CAP area in both the CC and IC. These findings suggest that developmental expansion of immature oligodendrocytes during the premyelination period may be important in defining structural and functional maturation of the white matter.

Original languageEnglish (US)
Pages (from-to)5988-5997
Number of pages10
JournalJournal of Neuroscience
Issue number25
StatePublished - Jul 22 2005


  • Brain development
  • Compound action potential
  • Conduction velocity
  • Diffusion tensor imaging
  • Oligodendrocyte
  • Sodium channel

ASJC Scopus subject areas

  • General Neuroscience


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