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Male Sprague-Dawley rats were used to study the possible role of hyperthermia in the thirst associated with thermal dehydration. Rats were exposed to 40 degrees C for 4 h and then allowed access to water at different times after they were transferred to 25 degrees C. Delaying the time prior to allowing the rats to drink did not significantly alter either(More)
Male rats were thermally dehydrated by exposure without water to an environmental temperature of 40 degrees C for 0-4 hr or to environmental temperatures of 25-40 degrees C for 4 hr. Water intake was then measured for 2 hr or a blood sample was taken to determine the effect of heat exposure on body water status. Evaporative water loss and water intake(More)
The vasopressin-activated calcium-mobilizing (VACM-1) protein is a unique arginine vasopressin (AVP) receptor which shares sequence homology with the cullins, genes involved in the regulation of cell cycle transitions. Unlike either cullins or AVP receptors, however, VACM-1 is expressed exclusively in the vascular endothelial cells and in the renal(More)
Temporal variation in spontaneous water intake in rats is well established but little is known about temporal variation in water intake following dehydration. In the present study different male Sprague-Dawley strain rats were exposed without water for 3 h to either a 25 degrees C or a 40 degrees C environment every 4 h for 20 h. The rats were then allowed(More)
BACKGROUND In the renal collecting duct, vasopressin regulates water permeability by a process that involves stimulation of adenylyl cyclase activity, cAMP production and subsequent translocation of water channel aquaporin-2 (AQP2) into the apical plasma membrane. We have previously shown that in cos 1 cells in vitro, both adenylyl cyclase activity and cAMP(More)
IL-2 potentiates both growth and cytotoxic function of T lymphocytes and NK cells. Resting peripheral blood NK cells can respond directly to rIL-2, without requirement for accessory cells or cofactors, and enhanced cytotoxicity can be measured within a few hours after exposure to this lymphokine. In this study, we describe an activation antigen, Leu-23,(More)
The aim of the present study was to characterize the sympathetic nerve responses to hyperthermia in chloralose-anesthetized rats. Discharges were recorded from the renal, lumbar, and splanchnic sympathetic nerves. Mean arterial pressure, heart rate, and sympathetic nerve discharge (SND) were recorded continuously during progressive increases in core body(More)
Resting systolic, diastolic, and mean blood pressures (MBP), as well as heart rates, of unanesthetized, unrestrained, cold-acclimated (CA, 4 wk, 6 degrees C) rats were measured by direct arterial cannula and compared with those of controls maintained at 25 degrees C. Exposure to cold increased all these measurements significantly. Mean heart weight of CA(More)
The effect of acute administration of SQ 14,225, a new angiotensin converting enzyme inhibitor, on the drinking response of female rats administered either isoprenaline, angiotensin I, or angiotensin II was studied during 2 h after treatment. Administration of isoprenaline (25 micrograms/kg body wt) was accompanied by a significant increase in water intake(More)
Female rats administered serotonin (0.25 to 4.0 mg/kg, s.c.) showed a dose-dependent increase in water intake. The dipsogenic response was nearly maximal when 2 mg/lg was administered s.c. and plateaued by 2 hr after treatment. l-5-Hydroxytryptophan (5-HTP), the precursor of serotonin, is also a potent dipsogen which induces drinking by way of the(More)