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Responses to Dehydration in the One-Humped Camel and Effects of Blocking the Renin-Angiotensin System
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.
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2012 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 7, no 5, e37299- p.Article in journal (Refereed) Published
Abstract [en]

Our objectives were to compare the levels of circulating electrolytes, hormones, and renal function during 20 days of dehydration in camels versus the level in non-dehydrated camels and to record the effect of blocking angiotensin II AT1 receptors with losartan during dehydration. Dehydration induced significant increments in serum sodium, creatinine, urea, a substantial fall in body weight, and a doubling in plasma arginine vasopressin (AVP) levels. Plasma aldosterone, however, was unaltered compared with time-matched controls. Losartan significantly enhanced the effect of dehydration to reduce body weight and increase serum levels of creatinine and urea, whilst also impairing the rise in plasma AVP and reducing aldosterone levels. We conclude that dehydration in the camel induces substantial increments in serum sodium, creatinine, urea and AVP levels; that aldosterone levels are altered little by dehydration; that blockade of angiotensin II type 1 receptors enhances the dehydration-induced fall in body weight and increase in serum creatinine and urea levels whilst reducing aldosterone and attenuating the rise in plasma AVP.

Place, publisher, year, edition, pages
2012. Vol. 7, no 5, e37299- p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:uu:diva-177622DOI: 10.1371/journal.pone.0037299ISI: 000305343500092OAI: oai:DiVA.org:uu-177622DiVA: diva2:541503
Available from: 2012-07-18 Created: 2012-07-17 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Effects of Dehydration and Blockade of the Renin-Angiotensin System in the One-humped Camel (Camelus dromedarius)
Open this publication in new window or tab >>Effects of Dehydration and Blockade of the Renin-Angiotensin System in the One-humped Camel (Camelus dromedarius)
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The one-humped or the dromedarian camel is a pseudo-ruminant mammal, well adapted to the hot and dry climates of the desert. Its ability to withstand torrid heat and extreme desiccation is of paramount importance to its survival. The studies presented in this thesis were designed to investigate and document the effect of dehydration in the presence or absence of angiotensin II (Ang II) AT1 receptor blocker (losartan) on blood constituents, electrolytes, hormones, neurotransmitters as well as liver and kidney enzymes in a subset of dehydrated camels and to compare them with hydrated camels. Additionally, we studied the response of atrial natriuretic peptide (ANP) and B-type natriuretic peptide (BNP) and revealed for the first time the cardiac storage form of BNP in the camel heart. Dehydration induced significant increments in packed cell volume (PCV), white blood cells (WBC), gamma glutamyl-transferase (GGT), serum sodium, creatinine and urea levels, and a doubling in plasma cortisol and arginine vasopressin (AVP) levels. At the same time dehydration caused significant decrease in body weights, plasma insulin like growth factor-1 (IGF-1) and its binding protein-3 (IGFBP-3), and a 50% decrement in ANP and BNP levels. Moreover, dehydration with and without losartan resulted in significant changes in stress hormones and anti-oxidants in plasma, liver and kidney homogenates. Losartan on one hand enhanced the effect of dehydration resulting in significant increases in sodium, creatinine and urea levels. In addition losartan raised the  binding affinity of Ang II AT2 receptors in the small intestine with 8-fold and with 16-fold for liver AT1 receptors, indicating that Ang II AT1 and AT2 receptor binding sites were present in camel's small intestine while only AT1 receptor binding sites were found in the camel liver. One the other hand losartan resulted in significant decrease in body weights impaired the rise in anti-diuretic hormone and reduced aldosterone level. Finally, we showed that the proBNP is the storage form of BNP in the camel heart.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2013. 52 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 1651-6192 ; 178
Keyword
Blood, biochemical analysis, catecholamine, colorimetric assay, cortisol, dehydration, dromedary camel, glutathione, hematological analysis, HPLC, insulin- like growth factor-1, losartan, plasma, receptors, radioimmunoassay, serum
National Category
Pharmaceutical Sciences
Research subject
Pharmaceutical Science
Identifiers
urn:nbn:se:uu:diva-207574 (URN)978-91-554-8757-7 (ISBN)
Public defence
2013-10-16, C8:321, Biomedical center, Husargatan 3, Uppsala, 13:15 (English)
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Supervisors
Available from: 2013-09-26 Created: 2013-09-16 Last updated: 2016-10-14

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