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Related Experiment Videos

Expression of septin 3 isoforms in human brain.

Masanori Takehashi1, Seigo Tanaka, Todd Stedeford

  • 1Laboratory of Molecular Clinical Chemistry, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.

Gene Expression
|June 18, 2004
PubMed
Summary

Human septin 3 (SEPT3) isoforms A and B are expressed in specific brain regions and neuronal structures. These findings suggest SEPT3 plays a role in synaptogenesis and neuronal development.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Septins are GTPase proteins involved in various cellular functions.
  • Septin 3 (SEPT3) is a novel member of the septin family.
  • Two human SEPT3 isoforms (A and B) arise from alternative splicing, with their brain expression and function previously undetermined.

Purpose of the Study:

  • To investigate the expression patterns of human SEPT3 isoforms A and B in normal human brain tissue.
  • To examine SEPT3 isoform expression in the human neuroblastoma cell line SH-SY5Y following retinoic acid-induced differentiation.
  • To elucidate the potential role of SEPT3 in neuronal development and synaptogenesis.

Main Methods:

  • Analysis of SEPT3 isoform expression in normal human brain and SH-SY5Y cells.

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  • Retinoic acid-induced differentiation of SH-SY5Y cells.
  • Immunohistochemistry to determine regional and cellular distribution.
  • Immunoprecipitation assays to identify protein interactions.

    • Main Results:

    • SEPT3 isoforms A and B exhibited similar expression and distribution patterns, resembling those of CDCrel-1.
    • Region-specific expression was observed in the human brain, with highest levels in the temporal cortex and hippocampus.
    • Immunoreactivity was prominent in neocortices, associated with neuropils and potential synaptic junctions.
    • SEPT3 isoforms A and B, along with CDCrel-1, form protein complexes in the human frontal cortex.

    Conclusions:

    • SEPT3 isoforms A and B are expressed in a region-specific manner in the human brain.
    • SEPT3 isoforms localize to neuronal structures, including potential synaptic junctions.
    • SEPT3, in complex with CDCrel-1, likely plays a fundamental role in synaptogenesis and neuronal development.