Urotensin II in the killifish gill: regulation of gill chloride transport

Urotensin II and its receptor in the killifish gill: regulators of NaCl extrusion.

The peptide urotensin II (UII) and its receptor (UT) mediate cardiovascular and renal effects in both mammals and fishes. In both groups, vasopressor and diuretic responses predominate, although, in mammals, some secondary vasodilatation is found, mediated by secondary release of nitric oxide or prostacyclin. In fishes, gill extrusion of NaCl is inhibited by UII, but a single study has determin...

Ionic Transport in the Fish Gill Epithelium

The gill of fishes is modified for gas exchange, thereby providing a site for net movement of salts and water down their respective gradients. Specialized cells in the gill epithelium are joined by tight junctions of variable depth and express a variety of transporters and channels. These cells mediate NaCl extrusion in marine fishes and NaCl uptake in freshwater fishes. These transport steps a...

The gill and homeostasis: transport under stress.

IN HIS RECENT CANNON LECTURE, Cowley (3) pointed out the parallels between Cannon’s time early in the last century and our own, i.e., the challenge facing us now, as then, is that of “systems integration” and understanding how organisms actually achieve homeostasis. We have begun to generate an incredible “array” of detail at the genomic and molecular levels (e.g., Refs. 3, 23), but, as noted b...

Effects of salinity and plasma prolactin on chloride cells in the gill of Chalcalburnus chalcoides

Gill chloride cells and prolactin hormone are of high importance in the adaptation of euryhaline fish. Guldenstati (Chalcalburnus chalcoides, 1772), an adromous fish, migrates from the Caspian Sea to rivers to have a more successful reproduction. The present study was aimed to evaluate the changes in the number and size of C. chalcoides gill chloride cells as well as to determine the relationsh...

Mechanisms of Hormone Actions on Gill Transport