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Related Experiment Videos

Expression of plasmolipin in the developing rat brain.

V S Sapirstein1, C E Nolan, I I Stadler

  • 1Division of Neurobiology, Nathan Kline Institute, Orangeburg, New York 10962.

Journal of Neuroscience Research
|January 1, 1992
PubMed
Summary

Plasmolipin, a K+ channel protein, is primarily expressed postnatally in the rat brain, mainly in oligodendrocytes. A related fetal protein (FPIP) appears transiently in embryonic brain cells.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Cell Biology

Background:

  • Plasmolipin is an hydrophobic plasma membrane proteolipid found in kidney and brain.
  • It forms K+ selective voltage-dependent channels composed of two subunits.
  • Its developmental expression in the brain is not well understood.

Purpose of the Study:

  • To define the embryonic and postnatal expression patterns of plasmolipin in the developing rat brain.
  • To identify and characterize related proteins during brain development.

Main Methods:

  • Immunohistochemistry and Western blot analysis were used to detect plasmolipin and FPIP.
  • Cellular localization studies were performed on various cell types.

Main Results:

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  • Plasmolipin expression is largely restricted to the postnatal period, increasing significantly between weeks 1-4.
  • A fetal plasmolipin immunoreactive protein (FPIP) was identified in embryonic brain, with biphasic expression.
  • FPIP was found in immature and dividing cells, while mature plasmolipin localized to oligodendrocytes and renal tubular cells.

Conclusions:

  • Plasmolipin expression is developmentally regulated in the rat brain, coinciding with oligodendrocyte maturation.
  • FPIP represents a distinct developmental protein potentially involved in early neural development.
  • The distinct expression patterns suggest differential roles for plasmolipin and FPIP in the central nervous system.