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Main Library
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Folly Beach Library
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Freshwater Fish Gill Ion Transport: August Krogh to morpholinos and microprobes.
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- Author(s): Evans, D. H.
- Source:
Acta Physiologica. Jul2011, Vol. 202 Issue 3, p349-359. 11p. 2 Diagrams. - Source:
- Additional Information
- Subject Terms:
- Abstract: August Krogh proposed that freshwater fishes (and other freshwater animals) maintain body NaCl homoeostasis by extracting these ions from the environment via separate Na/NH and Cl/HCO exchangers in the gill epithelium. Subsequent data from other laboratories suggested that Na uptake was more probably coupled to H secretion via a vesicular proton pump (V-ATPase) electrically coupled to a Na channel. However, despite uncertainty about electrochemical gradients, evidence has accrued that epithelial Na/H exchange indeed may be an alternative pathway for Na uptake. The specific pathways for Na uptake may be species and environment specific. An apical Cl/HCO exchanger is generally accepted for most species (some species do not extract Cl from freshwater), but the relative roles of anion exchanger-like (SLC4A1) vs. pendrin-like (SLC26Z4) exchangers are unknown, and also may be species specific. Most recently, data have supported the presence of an apical Na + Cl cotransporter (NCC-type), despite thermodynamic uncertainty. Ammonia extrusion may be via NH diffusing through the paracellular junctions or NH substitution on both basolateral and apical ionic exchangers (Na + K-ATPase; Na + K + Cl - cotransporter; and Na/H exchanger), but recent evidence suggests that Rhesus-glycoproteins mediate both basolateral and apical movement of ammonia. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Acta Physiologica is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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