Cited by 87Ion channel regulation and functionRetinal Development and DisordersIon Transport and Channel Regulation

Molecular Cloning and Functional Expression of the Potassium-Dependent Sodium–Calcium Exchanger from Human and Chicken Retinal Cone Photoreceptors

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Prinsen, Clemens F. M., Szerencsei, Robert T., Schnetkamp, Paul P. M.·2000·The Journal of Neuroscience

Abstract

Light causes a rapid lowering of cytosolic free calcium in the outer segments of both retinal rod and cone photoreceptors. This light-induced lowering of calcium is caused by extrusion via a Na–Ca exchanger located in the rod and cone outer segment plasma membrane and plays a key role in the process of light adaptation. The Na–Ca exchanger in retinal rod outer segment was shown earlier to be a novel Na–Ca+K exchanger (NCKX), and its cDNA was obtained by molecular cloning from several mammalian species. On the other hand, the proper identity of the retinal cone Na–Ca exchanger, in terms of both functional characteristics (e.g., requirement for and transport of potassium) and molecular identity, has not yet been elucidated. Here, we report the molecular cloning, intraretinal localization by in situ hybridization, and initial functional characterization of the chicken and human cone-specific Na–Ca exchangers. In addition we report the chicken rod-specific NCKX. We identified NCKX transcripts in both human and chicken cones and observed strong potassium-dependent Na–Ca exchange activity after heterologous expression of human and chicken cone NCKX cDNAs in cultured insect cells.In situ hybridization in chicken retina showed abundant rod NCKX transcripts only in rod photoreceptors, whereas abundant cone NCKX transcripts were found in most, if not all, cone photoreceptors and also in a subpopulation of retinal ganglion cells. A detailed comparison with the previously described retinal rod and brain NCKX cDNAs is presented.

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Crossref · 10.1523/jneurosci.20-04-01424.2000

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Authors
Prinsen, C. F. M., Szerencsei, R. T., & Schnetkamp, P. P. M.
Affiliations
University of Calgary (CA)
Venue
The Journal of Neuroscience
Published
2000-02-15
Volume
20
Issue
4
Pages
1424-1434
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1605764426
Cited by
87
References
46
Citations by year
2026: 1 · 2025: 2 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 3 · 2018: 3 · 2017: 4 · 2016: 1 · 2015: 1 · 2014: 2 · 2013: 3 · 2012: 1
FWCI
2.77
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Fondation pour la Recherche Médicale
  • Alberta Heritage Foundation for Medical Research
  • Medical Research Council Canada
  • Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion Transport and Channel Regulation
Keywords
Na+/Ca2+ exchanger, cone photoreceptors, rod photoreceptors, light adaptation, calcium efflux, retinal outer segments, retinal ganglion cells, chicken retina, human retina, cDNA cloning, heterologous expression, in situ hybridization
MeSH terms
Amino Acid Sequence, Animals, Brain, Calcium, Carrier Proteins, Cattle, Chickens, Cloning, Molecular, Humans, Kinetics, Male, Molecular Sequence Data, Recombinant Proteins, Retina, RNA, Messenger, Rod Cell Outer Segment, Transcription, Genetic, Transfection, Sequence Alignment, Sequence Homology, Amino Acid, Retinal Cone Photoreceptor Cells, Sodium-Calcium Exchanger, Protein Isoforms, Rats

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