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Myelin basic protein immunoreactivity in the human embryonic CNS

N Zecević1, A Andjelković, J M Matthieu

  • 1Department of Medicine, University of Connecticut Medical Center, Farmington 06030-1305, USA. nzecevic@neuron.uchc.edu

Brain Research. Developmental Brain Research
|March 13, 1998
PubMed
Summary

Myelin basic protein (MBP) is found in human embryonic tissues before myelination begins. Early embryonic cells express MBP and macrophage markers, suggesting a link between immune and nervous systems during development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Immunology

Background:

  • Myelin basic protein (MBP) is a key component of myelin produced by oligodendrocytes in the central nervous system (CNS).
  • MBP expression has traditionally been viewed as a marker for oligodendrocyte differentiation and CNS myelination.

Purpose of the Study:

  • To investigate the expression and localization of MBP and its mRNA in human embryos and fetuses.
  • To explore the cellular identity of MBP-expressing cells during early human development.

Main Methods:

  • Immunohistochemistry was used to detect MBP expression in human embryonic and fetal tissues (5-20 gestational weeks).
  • In situ hybridization was employed to identify MBP mRNA.
  • Co-localization studies utilized markers for macrophages (lectin/RCA-1, CD68/EBM-11), microglia, neurons, astroglia, and oligodendrocyte progenitors.

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Main Results:

  • MBP immunoreactivity was detected in both nervous and non-nervous tissues from as early as 5-6 gestational weeks, preceding myelination.
  • MBP-expressing cells were morphologically similar to macrophages and co-expressed macrophage-microglia markers.
  • MBP mRNA was present in the CNS from 5 gestational weeks onwards.
  • MBP-expressing cells were negative for neuronal, astroglial, and oligodendrocyte progenitor markers.

Conclusions:

  • MBP expression occurs broadly in the developing human CNS and non-nervous tissues before the onset of myelination.
  • A distinct population of cells expresses both MBP and macrophage markers during early embryonic development.
  • These findings suggest MBP or related proteins may act as a bridge between the immune and nervous systems, potentially serving functions beyond myelination.