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Related Experiment Video

Updated: May 31, 2026

Preparation of Newborn Rat Brain Tissue for Ultrastructural Morphometric Analysis of Synaptic Vesicle Distribution at Nerve Terminals
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Chronological changes in prosaposin in the developing rat brain.

Bing Xue1, Jie Chen, Huiling Gao

  • 1Division of Anatomy and Embryology, Department of Integrated Basic Medical Science, Ehime University School of Medicine, Shitsukawa, To-on, Ehime 791-0295, Japan.

Neuroscience Research
|June 21, 2011
PubMed
Summary

Prosaposin, a neurotrophic factor, shows high expression in early rat brain development, particularly in lysosomes. Its levels change significantly from embryonic stages through postnatal development, suggesting a crucial role in brain maturation.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cell Biology

Background:

  • Prosaposin is a precursor to saposins A-D, activating lysosomal sphingolipid hydrolases.
  • Intact prosaposin functions as a neurotrophic factor, promoting neuronal survival and neurite outgrowth.

Purpose of the Study:

  • To investigate the developmental changes in prosaposin expression in the rat brain.
  • To determine the cellular localization of prosaposin during early brain development.

Main Methods:

  • Immunofluorescence staining and Diaminobenzidine (DAB) immunohistochemistry to assess prosaposin immunoreactivity.
  • Co-localization studies using an anti-Cathepsin D antibody to identify lysosomal localization.
  • In situ hybridization to analyze prosaposin mRNA expression and its splice variants.

Main Results:

  • Prosaposin immunoreactivity peaked on postnatal day 1 in hippocampal regions (CA1, CA3, dentate gyrus) and cerebral cortex, then decreased by postnatal day 28.
  • Prosaposin co-localized with lysosomes, indicating its presence within these organelles in neurons.
  • Prosaposin mRNA levels, especially a variant lacking a nine-base insertion, increased from embryonic day 15 to postnatal day 7, followed by a decline.

Conclusions:

  • Prosaposin expression is dynamically regulated during rat brain development.
  • The observed high expression in perinatal stages suggests a significant role for prosaposin in early neuronal development and function.
  • Prosaposin's localization in lysosomes points to its involvement in lysosomal pathways crucial for neuronal health.