Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris)
The renin‐angiotensin‐aldosterone system (RAAS) appears to contribute significantly to osmoregulation of fasting northern elephant seal (Mirounga angustirostris) pups; however, RAAS has not been characterized in fasting adult seals. Therefore, this study examined the contribution of RAAS to water tu...
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ftrwuniv:oai:docs.rwu.edu:fcas_fp-1082 2023-05-15T16:05:13+02:00 Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris) Ortiz, Rudy M. Crocker, Daniel E. E. Houser, Dorian S. Webb, Paul M. 2006-01-01T08:00:00Z application/pdf https://docs.rwu.edu/fcas_fp/83 https://docs.rwu.edu/cgi/viewcontent.cgi?article=1082&context=fcas_fp unknown DOCS@RWU https://docs.rwu.edu/fcas_fp/83 https://docs.rwu.edu/cgi/viewcontent.cgi?article=1082&context=fcas_fp Arts & Sciences Faculty Publications northern elephant seal (Mirounga angustirostris) pups renin‐angiotensin‐aldosterone system Biology text 2006 ftrwuniv 2022-04-10T20:36:49Z The renin‐angiotensin‐aldosterone system (RAAS) appears to contribute significantly to osmoregulation of fasting northern elephant seal (Mirounga angustirostris) pups; however, RAAS has not been characterized in fasting adult seals. Therefore, this study examined the contribution of RAAS to water turnover rates in fasting adult male northern elephant seals. Blood samples were obtained twice during their breeding fast at an interval of 6.5 wk, and water efflux rate was estimated by isotopic dilution during the same period. Serum electrolytes (Na+, K+, Cl−) and osmolality were unaltered between the two sampling periods, indicating ionic and osmotic homeostasis during the fast. Despite the lack of an increase in vasopressin, serum angiotensin II and aldosterone were increased and were significantly and positively correlated. Changes in aldosterone concentration and water efflux rate were significantly and negatively correlated, suggesting that the greater the increase in aldosterone, the smaller the loss of water. Adult male seals maintain ionic and osmotic homeostasis similar to that of fasting weaned pups, and this homeostasis appears to be mediated, at least in part, by RAAS, which probably contributes to increased water retention as well. The hormonal mechanisms by which northern elephant seals maintain water and electrolyte balance during fasting conditions appear to be similar regardless of age. Text Elephant Seal Elephant Seals Roger Williams University: DOCS@RWU |
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Roger Williams University: DOCS@RWU |
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northern elephant seal (Mirounga angustirostris) pups renin‐angiotensin‐aldosterone system Biology |
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northern elephant seal (Mirounga angustirostris) pups renin‐angiotensin‐aldosterone system Biology Ortiz, Rudy M. Crocker, Daniel E. E. Houser, Dorian S. Webb, Paul M. Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris) |
topic_facet |
northern elephant seal (Mirounga angustirostris) pups renin‐angiotensin‐aldosterone system Biology |
description |
The renin‐angiotensin‐aldosterone system (RAAS) appears to contribute significantly to osmoregulation of fasting northern elephant seal (Mirounga angustirostris) pups; however, RAAS has not been characterized in fasting adult seals. Therefore, this study examined the contribution of RAAS to water turnover rates in fasting adult male northern elephant seals. Blood samples were obtained twice during their breeding fast at an interval of 6.5 wk, and water efflux rate was estimated by isotopic dilution during the same period. Serum electrolytes (Na+, K+, Cl−) and osmolality were unaltered between the two sampling periods, indicating ionic and osmotic homeostasis during the fast. Despite the lack of an increase in vasopressin, serum angiotensin II and aldosterone were increased and were significantly and positively correlated. Changes in aldosterone concentration and water efflux rate were significantly and negatively correlated, suggesting that the greater the increase in aldosterone, the smaller the loss of water. Adult male seals maintain ionic and osmotic homeostasis similar to that of fasting weaned pups, and this homeostasis appears to be mediated, at least in part, by RAAS, which probably contributes to increased water retention as well. The hormonal mechanisms by which northern elephant seals maintain water and electrolyte balance during fasting conditions appear to be similar regardless of age. |
format |
Text |
author |
Ortiz, Rudy M. Crocker, Daniel E. E. Houser, Dorian S. Webb, Paul M. |
author_facet |
Ortiz, Rudy M. Crocker, Daniel E. E. Houser, Dorian S. Webb, Paul M. |
author_sort |
Ortiz, Rudy M. |
title |
Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris) |
title_short |
Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris) |
title_full |
Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris) |
title_fullStr |
Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris) |
title_full_unstemmed |
Angiotensin II and Aldosterone Increase with Fasting in Breeding Adult Male Northern Elephant Seals (Mirounga angustirostris) |
title_sort |
angiotensin ii and aldosterone increase with fasting in breeding adult male northern elephant seals (mirounga angustirostris) |
publisher |
DOCS@RWU |
publishDate |
2006 |
url |
https://docs.rwu.edu/fcas_fp/83 https://docs.rwu.edu/cgi/viewcontent.cgi?article=1082&context=fcas_fp |
genre |
Elephant Seal Elephant Seals |
genre_facet |
Elephant Seal Elephant Seals |
op_source |
Arts & Sciences Faculty Publications |
op_relation |
https://docs.rwu.edu/fcas_fp/83 https://docs.rwu.edu/cgi/viewcontent.cgi?article=1082&context=fcas_fp |
_version_ |
1766401129163259904 |