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Perisynaptic organization of plasma membrane calcium pumps in cerebellar cortex.

Authors: Burette, Alain  Weinberg, Richard J 
Citation: Burette A and Weinberg RJ, J Comp Neurol. 2007 Feb 20;500(6):1127-35. doi: 10.1002/cne.21237.
Pubmed: (View Article at PubMed) PMID:17183553
DOI: Full-text: DOI:10.1002/cne.21237

Calcium, a ubiquitous intracellular messenger, regulates numerous intracellular signaling pathways. To permit specificity of signal transduction and prevent unwanted cross-talk between pathways, sites of calcium entry in neurons are localized to specific membrane domains. To test whether Ca(2+) extrusion pumps might exhibit analogous compartmentalization, we used immunohistochemistry to determine the subcellular localization of the two main plasma membrane Ca(2+)-ATPase (PMCA) isoforms in the cortex of the rat cerebellum. We find that both PMCA2 and PMCA3 are targeted to distinct compartments within the plasma membrane. In the molecular layer, both isoforms were at highest levels within synaptic profiles, but PMCA2 was postsynaptic and PMCA3 was presynaptic. Moreover, inside these compartments, both pumps exhibited nonuniform distributions. These data imply that cerebellar neurons possess remarkably effective mechanisms to target and restrict PMCA2 and -3 to specific membrane domains, raising the possibility that calcium pumps contribute to local Ca(2+) signaling.


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CRRD Object Information
CRRD ID: 13702242
Created: 2018-07-18
Species: All species
Last Modified: 2018-07-18
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.