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  The Drosophila melanogaster Na+ /Ca2+ exchanger CALX controls the Ca2+ level in olfactory sensory neurons at rest and after odorant receptor activation

Halty, L., Hansson, B. S., & Wicher, D. (2018). The Drosophila melanogaster Na+ /Ca2+ exchanger CALX controls the Ca2+ level in olfactory sensory neurons at rest and after odorant receptor activation. Frontiers in Cellular Neuroscience, 12: 186. doi:10.3389/fncel.2018.00186.

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https://doi.org/10.3389/fncel.2018.00186 (Publisher version)
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 Creators:
Halty, Lorena1, 2, Author              
Hansson, Bill S.1, Author              
Wicher, Dieter1, Author              
Affiliations:
1Department of Evolutionary Neuroethology, Prof. B. S. Hansson, MPI for Chemical Ecology, Max Planck Society, ou_421894              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              

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 Abstract: CALX, the Na+/Ca2+ exchanger in Drosophila, is highly expressed in the outer dendrites of olfactory sensory neurons (OSNs) which are equipped with the odorant receptors (ORs). Insect OR/Orco dimers are nonselective cation channels that pass also calcium which leads to elevated calcium levels after OR activation. CALX exhibits an anomalous regulation in comparison to its homolog in mammals sodium/calcium exchanger, NCX: it is inhibited by increasing intracellular calcium concentration [Ca2+]i. Thus, CALX mediates only Ca2+ efflux, not influx. The main goal of this study was to elucidate a possible role of this protein in the olfactory response. We first asked whether already described NCX inhibitors were capable of blocking CALX. By means of calcium imaging techniques in ex-vivo preparations and heterologous expression systems, we determined ORM-10962 as a potent CALX inhibitor. CALX inhibition did not affect the odor response but it affected the recovery of the calcium level after this response. In addition, CALX controls the calcium level of OSNs at rest.

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 Dates: 2018-02-272018-07-162018-07-03
 Publication Status: Published in print
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 Identifiers: DOI: 10.3389/fncel.2018.00186
Other: HAN313
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Title: Frontiers in Cellular Neuroscience
  Other : Front. Cell. Neurosci.
  Abbreviation : FNCEL
Source Genre: Journal
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Publ. Info: Frontiers Research Foundation
Pages: - Volume / Issue: 12 Sequence Number: 186 Start / End Page: - Identifier: ISSN: 1662-5102
CoNE: https://pure.mpg.de/cone/journals/resource/1662-5102