Cited by 58Neurogenesis and neuroplasticity mechanismsNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Myelination of the corpus callosum in male and female rats following complex environment housing during adulthood

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Markham, Julie A., Herting, Megan M., Luszpak, Agatha E., Juraska, Janice M., Greenough, William T.·2009·Brain Research

Abstract

Myelination is an important process in brain development, and delays or abnormalities in this process have been associated with a number of conditions including autism, developmental delay, attention deficit disorder, and schizophrenia. Myelination can be sensitive to developmental experience; however, although the adult brain remains highly plastic, it is unknown whether myelination continues to be sensitive to experience during adulthood. Male and female rats were socially housed until four months of age, at which time they were moved into either a complex or "enriched" environment (EC) or an isolated condition (IC). Although the area of the splenium (posterior 20% of the callosum, which contains axons from visual cortical neurons) increased by about 10% following two months of EC housing, the area occupied by myelinated axons was not influenced by adult housing condition. Instead, it was the area occupied by glial cell processes and unmyelinated axons which significantly increased following EC housing. Neither the size nor the myelin content of the genu (anterior 15% of the callosum) was sensitive to manipulations of adult housing condition, but males had more area occupied by myelinated axons in both callosal regions. Finally, the inability of two months of complex environment housing during adulthood to impact the number of myelinated axons in the splenium was confirmed in a subset of animals using quantitative electron microscopy. We conclude that the sensitivity of myelination to experience is reduced in adulthood relative to development in both sexes.

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Crossref · 10.1016/j.brainres.2009.06.087

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  1. Brinley FJ Mountcastle VB 1980 Excitation and conduction in nerve fibers Medical Physiology 1 The C.V. Mosby Co St. Louis 46 81

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Authors
Markham, J. A., Herting, M. M., Luszpak, A. E., Juraska, J. M., & Greenough, W. T.
Affiliations
University of Illinois Urbana-Champaign (US)
Venue
Brain Research
Publisher
Elsevier BV
Published
2009-09
Volume
1288
Pages
9-17
ISSN
0006-8993 (ISSN-L)
OpenAlex
W2093163702
Cited by
58
References
45
Citations by year
2025: 1 · 2022: 3 · 2021: 2 · 2020: 4 · 2019: 3 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 6 · 2014: 5 · 2013: 11 · 2012: 4
FWCI
1.46
Type
journal article
Language
en
Open access
Locations
  • Brain Research (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • U.S. Public Health Service (NICHHD07333, NIMH 35321)
  • National Institute on Aging (AG 022499, AG10154, R01AG022499, R01AG010154)
  • National Institute of Mental Health (R01MH035321)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (T32HD007333)
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
environmental enrichment, sex differences, splenium, genu, myelinated axons, unmyelinated axons, social housing, rats
MeSH terms
Analysis of Variance, Animals, Axons, Cell Count, Corpus Callosum, Female, Male, Nerve Fibers, Myelinated, Neuroglia, Organ Size, Sex Characteristics, Sex Factors, Social Environment, Rats, Long-Evans, Microscopy, Electron, Transmission, Rats

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