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Nuclear pole complexes in cells of developing mouse cerebral cortex

Z Lodin, J Blumajer, V Mares

    Voprosy Biokhimii Mozga
    |January 1, 1978
    PubMed
    Summary
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    Mouse cerebral cortex cells show a significant increase in nuclear pore complexes from embryonic to postnatal stages. These nuclear pores are densely packed in adult brain cells compared to other cell types.

    Area of Science:

    • Cell Biology
    • Neuroscience
    • Developmental Biology

    Background:

    • Nuclear pore complexes regulate molecular transport between the nucleus and cytoplasm.
    • The development and density of nuclear pore complexes in the brain are not fully understood.

    Purpose of the Study:

    • To investigate the developmental changes in nuclear pore complexes in mouse cerebral cortex.
    • To quantify the density and total number of nuclear pores across different developmental stages.

    Main Methods:

    • Freeze-etch electron microscopy technique was employed.
    • Analysis was conducted on cells from embryonic day 18-20 to postnatal day 180.

    Main Results:

    • Nuclear pore complexes were randomly distributed on the nuclear membrane in all studied age groups.

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  • Pore density per square micrometer increased from 7.8 in embryonic stages to a peak of 18.1 at postnatal day 50.
  • The total number of pores per nucleus increased 5.2-fold from embryonic to postnatal day 15, then decreased by day 180.
  • Adult brain cell nuclei exhibit a very high density of nuclear pore complexes compared to other somatic and cancer cells.

    • Conclusions:

    • Nuclear pore complex numbers and density undergo significant dynamic changes during cerebral cortex development.
    • The high density of nuclear pores in adult brain cells suggests specialized transport requirements.
    • These findings provide a quantitative basis for understanding nuclear transport regulation in the developing brain.