Angiotensin converting enzyme in the toad Bufo arenarum

Fernández-Pardal, Julio; Perseguino, Juan C.; Berman, Dora M.; Coviello, Alfredo

doi:10.1016/0300-9629(86)90584-0

Cited by 11 publications

(1 citation statement)

References 14 publications

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“…With the possible exception of cyclostomes, renin or renin-like activities have been described in representatives of all vertebrate groups in addition to the eutherian mammals (fishes: 67,560,568,597,647; amphibians: 102, 340, 653; birds: 117, 912; marsupials: 746,802). The second enzyme of the cascade, angiotensin 1converting enzyme (kininase II), also has a widespread phylogenetic distribution from fish through representative amniotes (145,292,317,532,674,720,876). Several angiotensins have been sequenced, and there is significant homology among them (Table 10.34).…”

Section: The Kidneymentioning

confidence: 99%

Endocrinology of the Vertebrates

Henderson

1997

Comprehensive Physiology

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Section: The Kidneymentioning

confidence: 99%

Endocrinology of the Vertebrates

Henderson

1997

Comprehensive Physiology

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Effects of dehydration on plasma osmolality, thirst-related behavior, and plasma and brain angiotensin concentrations in Couch's spadefoot toad,Scaphiopus couchii

Johnson

Propper

2000

J. Exp. Zool.

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Under dehydrating conditions, many terrestrial vertebrates species exhibit increases in plasma osmolality and their drinking behavior. Under some circumstances, this behavioral change is accompanied by changes in plasma and central angiotensin concentrations, and it has been proposed that these changes in angiotensin levels induce the thirst‐related behaviors. In response to dehydration, the spadefoot toad, Scaphiopus couchii, exhibits thirst‐related behavior in the form of cutaneous drinking. This behavior has been termed water absorption response (WR) behavior. Spadefoot toads live in harsh desert environments and are subject annually to dehydrating conditions that may induce thirst‐related behavior. We tested the hypothesis that an increase in WR behavior is associated with both an increase in plasma osmolality and an increase in plasma and brain angiotensin concentrations. First, we determined the degree of dehydration that was necessary to initiate WR behavior. Animals dehydrated to 85% of their standard bladder‐empty weight via deprivation of water exhibited WR behavior more frequently than control toads left in home containers with water available. Next, using the same dehydration methods, we determined the plasma osmolality and sodium concentrations of dehydrated toads. Toads dehydrated to 85% standard weight also had a significant increase in plasma osmolality, but exhibited no overall change in plasma sodium concentrations, indicating that while an overall increase in plasma osmolality appears to be associated with WR behavior in S. couchii, changes in sodium concentrations alone are not sufficient to induce the behavior. Finally, plasma and brain angiotensin concentrations were measured in control toads and toads dehydrated to 85% standard weight. Plasma and brain angiotensin concentrations did not increase in dehydrated toads, indicating that dehydration‐induced WR behavior that is associated with changes in plasma osmolality may not be induced by changes in endogenous angiotensin concentrations in S. couchii. J. Exp. Zool. 286:572–584, 2000. © 2000 Wiley‐Liss, Inc.

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