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Apolipoprotein E immunoreactivity in human and mouse olfactory bulb.

R G Struble1, J Short, M Ghobrial

  • 1Center for Alzheimer's Disease and Related Disorders, Southern Illinois School of Medicine, Springfield 62794-9628, USA. bstruble@neuro.siumed.edu

Neuroscience Letters
|July 10, 1999
PubMed
Summary

Apolipoprotein E (apoE) is found in the olfactory nerve and around glomeruli in mice and humans, suggesting its role in olfactory nerve regeneration. ApoE-deficient mice confirmed these findings.

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Area of Science:

  • Neuroscience
  • Immunohistochemistry
  • Molecular Biology

Background:

  • The olfactory system undergoes continuous degeneration and regeneration.
  • Apolipoprotein E (apoE) is a lipid-binding protein with known roles in neural repair.
  • The specific distribution and function of apoE in the olfactory bulb remain largely uncharacterized.

Purpose of the Study:

  • To investigate the precise localization and distribution of apolipoprotein E (apoE) immunoreactivity within the olfactory bulbs of mice and humans.
  • To explore the potential association of apoE with the regenerative processes in the olfactory nerve.

Main Methods:

  • Immunohistochemistry was employed to detect apoE immunoreactivity in olfactory bulb tissues from both mouse and human subjects.
  • ApoE-deficient (apoE KO) mice were utilized to confirm the specificity of the observed immunoreactivity.

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  • Microscopic examination focused on identifying the cellular and structural locations of apoE staining.

    • Main Results:

    • ApoE immunoreactivity was predominantly observed in the olfactory nerve and surrounding the glomeruli within the olfactory bulb.
    • Staining was identified in somata consistent with glial cells, with no neuronal staining detected.
    • ApoE was also present in the subependymal layer of the mouse olfactory bulb.
    • ApoE-deficient mice exhibited a complete absence of apoE immunoreactivity, validating the antibody's specificity.

    Conclusions:

    • The presence of apoE in the olfactory nerve and periglomerular regions suggests a significant role in the ongoing degeneration and regeneration cycles of the olfactory nerve.
    • Further research involving experimental manipulation of the olfactory nerve may elucidate the specific functions of apoE in this well-defined neural system.