Cellular and subcellular localization of the neuron-specific plasma membrane calcium ATPase PMCA1a in the rat brain

Katharine A. Kenyon, Eric A. Bushong, Amy S. Mauer, Emanuel E. Strehler, Richard J. Weinberg, Alain C. Burette

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Regulation of intracellular calcium is crucial both for proper neuronal function and survival. By coupling ATP hydrolysis with Ca2+ extrusion from the cell, the plasma membrane calcium-dependent ATPases (PMCAs) play an essential role in controlling intracellular calcium levels in neurons. In contrast to PMCA2 and PMCA3, which are expressed in significant levels only in the brain and a few other tissues, PMCA1 is ubiquitously distributed, and is thus widely believed to play a "housekeeping" function in mammalian cells. Whereas the PMCA1b splice variant is predominant in most tissues, an alternative variant, PMCA1a, is the major form of PMCA1 in the adult brain. Here, we use immunohistochemistry to analyze the cellular and subcellular distribution of PMCA1a in the brain. We show that PMCA1a is not ubiquitously expressed, but rather is confined to neurons, where it concentrates in the plasma membrane of somata, dendrites, and spines. Thus, rather than serving a general housekeeping function, our data suggest that PMCA1a is a calcium pump specialized for neurons, where it may contribute to the modulation of somatic and dendritic Ca2+ transients.

Original languageEnglish (US)
Pages (from-to)3169-3183
Number of pages15
JournalJournal of Comparative Neurology
Volume518
Issue number16
DOIs
StatePublished - Aug 15 2010

Keywords

  • Cell Centered Database
  • ImageSurfer
  • calcium extrusion
  • calcium pump
  • immunohistochemistry

ASJC Scopus subject areas

  • Neuroscience(all)

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    Kenyon, K. A., Bushong, E. A., Mauer, A. S., Strehler, E. E., Weinberg, R. J., & Burette, A. C. (2010). Cellular and subcellular localization of the neuron-specific plasma membrane calcium ATPase PMCA1a in the rat brain. Journal of Comparative Neurology, 518(16), 3169-3183. https://doi.org/10.1002/cne.22409