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Characterization of microtubule-associated protein 2 from mouse brain and its localization in the cerebellar cortex

M Niinobe1, N Maeda, H Ino

  • 1Division of Regulation of Macromolecular Function, Osaka University, Japan.

Journal of Neurochemistry
|October 1, 1988
PubMed

Insights

Microtubule-associated protein 2 (MAP2) was purified from mouse brain, revealing its acidic nature and similarity to porcine MAP2. MAP2 expression is prominent in developing Purkinje cell dendrites within the mouse cerebellum.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Protein Biochemistry

Background:

  • Microtubule-associated protein 2 (MAP2) is crucial for microtubule stability and neuronal development.
  • Understanding MAP2's biochemical properties and localization is key to comprehending neuronal structure and function.

Purpose of the Study:

  • To purify and characterize mouse brain MAP2.
  • To investigate the developmental expression patterns of MAP2 in the mouse cerebellar cortex.

Main Methods:

  • Purification of MAP2 using heat treatment and BioGel A-5m gel filtration.
  • Analysis of protein purity and composition via SDS-PAGE and amino acid analysis.
  • Immunoblot analysis to detect MAP2 antigens in various tissues.
  • Immunohistochemistry to study developmental localization in the cerebellar cortex.

Main Results:

  • Purified mouse MAP2 exhibited characteristics of an acidic protein (pI 4.5), similar to porcine MAP2, with MAP2B absent.
  • MAP2 antigens were abundant in mouse brain, with weaker presence in other tissues, primarily at 162 and 170 kDa.
  • Developmental immunohistochemistry showed MAP2 localized in neuronal cells, with significant expression in Purkinje cell dendrites during arborization (postnatal days 3-20).
  • Mature MAP2 expression was strong in dendritic trees, but weak in proximal dendrites and cell bodies.

Conclusions:

  • Mouse brain MAP2 is an acidic protein with biochemical properties similar to its porcine counterpart.
  • MAP2 exhibits specific developmental localization in the mouse cerebellum, particularly in Purkinje cell dendrites, highlighting its role in neuronal maturation.

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