Marine mammals, including the bottlenose dolphin Tursiops truncatus, must rely on the water content of their food to achieve water balance. We have investigated the endocrine role of the antidiuretic hormone (vasopressin) in relation to food intake and water conservation. A series of seven bottlenose dolphins, maintained in a controlled environment, were sampled for blood and urine before and a...

The possibility that an alteration of the vasopressin-dependent cyclic AMP system plays a pathogenic role in the urinary concentrating defect in K+ depletion was investigated in the rat. The antidiuretic response to vasopressin was significantly less in K+-depleted rats. In these K+-depleted rats, the increase in urinary cyclic AMP excretion in response to vasopressin was also significantly les...

background the efficiency of nasal surgeries can be determined by objective or subjective methods. we have assessed the effect of nasal obstruction after different nasal surgeries using acoustic rhinometry (ar) and nasal obstruction symptom evaluation (nose) scale. methods between may 2011 and may 2012, 40 young adult patients and 10 healthy volunteers as control group who referred to otorhinol...

The effect of norepinephrine on exogenous vasopressin antidiuresis was investigated in water-loaded subjects. After an initial 2 to 3 hr period of water loading (phase 1), 10-100 mU of vasopressin per hr were infused at a constant rate for 1 hr (phase 2) followed by infusion of 10-100 mU of vasopressin per hr plus 600 mug of l-norepinephrine per hr for 1 hr (phase 3). Endogenous creatinine clea...

To study the relationship between vasopressin and the renal kallikrein-kinin system we measured the rate of excretion of kinins into the urine of anesthetized rats during conditions of increased and decreased vasopressin level. The excretion of immunoreactive kinins in Brattleboro rats with hereditary diabetes insipidus (DI) (24 +/- 3 pg min-1 kg-1) was lower than in the control Long Evans (LE)...

BACKGROUND Prior meta-analyses-reported results of randomised controlled trials (RCTs) published between 1997 and 2004 failed to show any vasopressin-related benefit in cardiac arrest. Based on new RCT-data and a hypothesis of a potentially increased vasoconstricting efficacy of vasopressin, we sought to determine whether the cumulative, current evidence supports or refutes an overall and/or se...

Vasopressin is one of several small neuropeptides that are reported to be autocrine growth factors for small cell carcinoma of the lung (SCCL). It has been assumed that this peptide exercises its ntitogenic influences through the Vasopressin V,., receptor, and we have previously demon strated that this receptor is expressed by classical and variant SCCL. Activation of the vasopressin Vla recept...

The present studies were designed to evaluate the physiological significance of angiotensin II in the control of vasopressin secretion in conscious dogs. They demonstrated that exogenous angiotensin II (10 ng/kg per min) increased vasopressin secretion more when the pressor effect of angiotensin II was abolished. The fact that endogenous angiotensin II levels are normally increased without an i...

Although nearly 10% of patients experience profound vasodilatory shock after cardiopulmonary bypass, some patients remain refractory to traditional resuscitation. Among this subset are patients who have inappropriately low levels of endogenous vasopressin. Thus, vasopressin replacement is an intuitively attractive intervention. The purposes of this review are to outline the pathophysiology of v...

The inactivation of vasopressin by heart as well as skeletal muscle was investigated in in vitro experiments. Heart muscle can inactivate vasopressin while skeletal muscle only binds some vasopressin. The mechanism of vasopres sin inactivation was studied by heat treatment, by determining pH optimum and by time-dependency studies. The inactivation of vasopressin by heart muscle proved to be an ...