The effects of freshwater to seawater transfer on circulating levels of angiotensin II, C-type natriuretic peptide and arginine vasotocin in the euryhaline elasmobranch, Carcharhinus leucas

Anderson, W. G., Pillans, R. D., Hyodo, S., Takehiro, T., Good, J. P., Takei, Y., Franklin, C. E. and Hazon, N. (2006) The effects of freshwater to seawater transfer on circulating levels of angiotensin II, C-type natriuretic peptide and arginine vasotocin in the euryhaline elasmobranch, Carcharhinus leucas. General and Comparative Endocrinology, 147 1: 39-46. doi:10.1016/j.ygcen.2005.07.007


Author Anderson, W. G.
Pillans, R. D.
Hyodo, S.
Takehiro, T.
Good, J. P.
Takei, Y.
Franklin, C. E.
Hazon, N.
Title The effects of freshwater to seawater transfer on circulating levels of angiotensin II, C-type natriuretic peptide and arginine vasotocin in the euryhaline elasmobranch, Carcharhinus leucas
Journal name General and Comparative Endocrinology   Check publisher's open access policy
ISSN 0016-6480
Publication date 2006-05-15
Sub-type Article (original research)
DOI 10.1016/j.ygcen.2005.07.007
Volume 147
Issue 1
Start page 39
End page 46
Total pages 8
Editor D. M. Dores
I. W. Henderson
Place of publication San Diego
Publisher Academic Press Inc Elsevier Science
Language eng
Subject C1
270604 Comparative Physiology
780105 Biological sciences
0608 Zoology
Abstract This study examined the effect of transfer to increased environmental salinity on the circulating levels of angiotensin II (ANG II), C-type natriuretic peptide (CNP), and arginine vasotocin (AVT) in the euryhaline elasmobranch, Carcharhinus letteas. Plasma levels of ANG 11 and CNP were significantly increased in C. leucas chronically acclimated to seawater (SW) in comparison to freshwater (FW) acclimated fish. There was no difference in plasma AVT levels. Acute transfer of FW fish to 75% SW induced an increase in plasma ANG II levels within 12 h, and subsequent transfer from 75 to 100% SW further increased plasma ANG 11 levels at both 24 and 72 h. No change in plasma CNP was observed during acute transfer to increased salinity. However, a significant increase in plasma AVT levels was observed following 96 h in 75% SW and 24 h in 100% SW. In chronically SW acclimated C leucas plasma osmolality, sodium, chloride, and Urea were all significantly higher than FW acclimated fish but there was no difference in haematocrit. Acute transfer of C letteas to 75% SW induced a significant increase in plasma osmolality, sodium and urea concentrations within 96 h of transfer. Subsequent transfer from 75 to 100% SW induced a further increase in these variables within 24 h in addition to a significant increase in plasma chloride above control levels. Haematocrit did not differ between the experimental and control groups throughout the acute study. Circulating levels of ANG 11 were significantly correlated to plasma, sodium, chloride, and urea concentrations during acclimation to SW. Conversely, circulating levels of CNP and AVT did not correlate to plasma osmolytes, however, CNP was significantly correlated to haematocrit during acclimation to seawater. (c) 2005 Elsevier Inc. All rights reserved.
Keyword Endocrinology & Metabolism
Elasmobranch
Euryhaline
osmoregulation
Osmoregulation
Endocrine
Natriuretic
Angiotensin
Avt
Trout Oncorhynchus-mykiss
Rectal Gland
Neurohypophyseal Hormones
Squalus-acanthias
Anguilla-japonica
Chloride Secretion
Atlantic Stingray
Urea Metabolism
Dasyatis-sabina
Na+/k+-atpase
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 19:20:30 EST