Differential Effects of Temperature on Oxygen Consumption and Branchial Fluxes of Urea, Ammonia, and Water in the Dogfish Shark (Squalus acanthias suckleyi)

2017 ◽  
Vol 90 (6) ◽  
pp. 627-637 ◽  
Author(s):  
Marina Giacomin ◽  
Patricia M. Schulte ◽  
Chris M. Wood
Keyword(s):  
Oxygen Consumption ◽  
Squalus Acanthias ◽  
Differential Effects ◽  
Dogfish Shark ◽  
Effects Of Temperature

scholarly journals Differential Effects of Temperature and Lipids on the Gating of RyR and SR K+ Channels

2016 ◽  
Vol 110 (3) ◽  
pp. 266a ◽  
Author(s):  
Sam El-Ajouz ◽  
Elisa Venturi ◽  
Rebecca Sitsapesan
Keyword(s):  
K Channels ◽  
Differential Effects ◽  
Effects Of Temperature

Characterization of an endothelin ET(B) receptor in the gill of the dogfish shark Squalus acanthias

1999 ◽  
Vol 202 (24) ◽  
pp. 3605-3610 ◽  
Author(s):  
D.H. Evans ◽  
M.P. Gunderson
Keyword(s):  
Blood Vessels ◽  
Gill Tissue ◽  
Squalus Acanthias ◽  
Single Site ◽  
Acid Base Balance ◽  
Ion Regulation ◽  
Base Balance ◽  
Dogfish Shark ◽  
Kinetics Of

Endothelins (ETs) are potent vasoconstrictive peptides that are secreted by the vascular endothelium and other tissues in vertebrates. Previous studies have demonstrated that ETs are expressed in a variety of fish tissues and contract various blood vessels. In order to determine if receptors for ET are expressed in fish gill tissue, we examined the binding kinetics of (125)I-labeled, human ET-1 to membrane fragments isolated from the gill of the dogfish shark, Squalus acanthias. (125)I-ET-1 bound at a single site, with a dissociation constant (K(d)) and binding site number (B(max)) very similar to those described in a variety of mammalian blood vessels. ET-1 and ET-3 competed equally with (125)I-ET-1, suggesting that the receptor was ET(B), which has been shown in mammalian systems to bind to both ligands equally. The ET(B)-specific agonists sarafotoxin S6c, IRL-1620, and BQ-3020 also competed against (125)I-ET-1 at a single site, supporting this hypothesis. We conclude that the shark gill expresses an ET(B) receptor with substantial homology to the mammalian receptor and that ET may play an important role in modulating such vital gill functions as gas exchange, ion regulation, acid-base balance, and excretion of nitrogen.

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