Vasopressin and nitric oxide synthesis after three days of water or food deprivation

Mornagui, B. and Grissa, A. and Duvareille, M. and Gharib, C. and Kamoun, A. and El-Fazaa, S. and Gharbi, N. (2006) Vasopressin and nitric oxide synthesis after three days of water or food deprivation. Acta Biologica Hungarica, 57 (1). pp. 1-11. ISSN 0236-5383

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Nitric oxide has been suggested to be involved in the regulation of fluid and nutrient homeostasis. In the present investigation, vasopressin and nitric oxide metabolite (nitrite and nitrate) levels were determined in plasma of male Wistar rats submitted to water or food deprivation for three days. Hematocrit and plasma sodium showed marked increase in dehydrated and starved rats. Potassium levels and plasma vol- ume decreased in both treated groups. Plasma osmolality and vasopressin levels were significantly ele- vated in water deprived (362.8 ± 7.1 mOsm/kg H 2 O, 17.3 ± 2.7 pg/ml, respectively, p < 0.001) rats, but not in food deprived (339.9 ± 5.0, 1.34 ± 0.28) rats, compared to the controls (326.1 ± 4.1, 1.47 ± 0.32). The alterations observed in plasma vasopressin levels were related to plasma osmolality rather than plasma volume. Plasma levels of nitrite and nitrate were markedly increased in both water and food deprived rats (respectively, 2.19 ± 0.29 mg/l and 2.22 ± 0.17 mg/l versus 1.33 ± 0.19 mg/l, both p < 0.01). There was a significant negative correlation between plasma nitrite and nitrate concentration and plasma volume. These results suggest that both dehydration and starvation increase plasma nitric oxide, proba- bly by activation of nitric oxide synthases. The release of nitric oxide may participate in the regulation of the alteration in blood flow, fluid and nutrient metabolism caused by water deprivation or starvation.

Item Type: Article
Subjects: Q Science / természettudomány > QH Natural history / természetrajz
Depositing User: Endre Sarvay
Date Deposited: 20 Nov 2017 14:14
Last Modified: 20 Nov 2017 14:14

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