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Open lumina of microampullary electroreceptor organs in the transparent catfish, Kryptopterus bicirrhis (Valenciennes 1840), contain 50 mM potassium: why?

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For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Netherlands Journal of Zoology (Vol 18-52).

Administration of the cell impermeant fluorescent K+ and Na+ probes potassium-binding fluorescent indicator (PBFI) and sodium-binding fluorescent indicator (SBFI) to the lumina of ampullary electroreceptor organs in the transparent catfish Kryptopterus bicirrhis (Valenciennes 1840), demonstrated an unexpected high concentration of K+ ions: 50 mM. Since the lumina of the ampullary organs are in open contact with the surrounding water, such a high K+ concentration inside the lumen can be maintained only by heavy metabolic transport. The implications of this finding for stimulus transduction in freshwater ampullary electroreceptor cells are discussed.

Affiliations: 1: Functional Neurobiology, Utrecht University, Padualaan 8, 3684 CH Utrecht, The Netherlands;, Email: r.c.peters@uu.nl; 2: Functional Neurobiology, Utrecht University, Padualaan 8, 3684 CH Utrecht, The Netherlands

10.1163/157075608X344631
/content/journals/10.1163/157075608x344631
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/content/journals/10.1163/157075608x344631
2008-07-01
2016-12-08

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