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

Author:

Eeuwes Lonneke1,Peters Robert2,Bretschneider Franklin3

Affiliation:

1. 1Functional Neurobiology, Utrecht University, Padualaan 8, 3684 CH Utrecht, The Netherlands

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

3. 3Functional Neurobiology, Utrecht University, Padualaan 8, 3684 CH Utrecht, The Netherlands

Abstract

AbstractAdministration 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.

Publisher

Brill

Subject

Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics

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