Related Experiment Video
Updated: Jul 13, 2026
07:50
A Method for Evaluating the Reinforcing Properties of Ethanol in Rats without Water Deprivation, Saccharin Fading or Extended Access Training
Published on: January 29, 2017
Effects of catecholamines on water intake in rats
M Russek1, L M Soto-Mora, T Uriostegui
1Departamento de Fisiología, Escuela Nacional de Ciencias Biológicas Instituto Politécnico Nacional México, D.F.
Physiology & Behavior
|January 1, 1991
Summary
Intraperitoneal adrenaline inhibits water intake in thirsty rats, regardless of thirst cause. Intramuscular adrenaline has minimal effect, suggesting a specific pathway for water intake inhibition by catecholamines.
Area of Science:
- Physiology
- Neuroendocrinology
Background:
- Intraperitoneal (IP) adrenaline (A) is known to inhibit food intake.
- Recent studies indicate IP adrenaline also inhibits water intake in thirsty rats, suggesting non-specific effects.
- The precise mechanism and specificity of adrenaline's effect on water intake require further investigation.
Purpose of the Study:
- To investigate the specificity of adrenaline's effect on water intake.
- To compare the effects of IP versus intramuscular (IM) administration of adrenaline on water intake.
- To explore the role of catecholamines and their administration routes in regulating thirst.
Main Methods:
- Rats were made thirsty through water deprivation or hypertonic saline/polyethylene glycol injections.
- Adrenaline (A), noradrenaline (NA), and isoproterenol (IS) were administered IP or IM in varying doses.
- Water intake was measured following catecholamine administration under different thirst conditions.
Main Results:
- IP adrenaline consistently reduced water intake in all tested conditions.
- A dose-dependent inhibition of water intake was observed with IP adrenaline in water-deprived rats.
- IM adrenaline showed minimal effect, even at the highest dose; IM NA and IS had no effect.
- IP noradrenaline showed a significant effect only at the highest dose.
Conclusions:
- Water intake inhibition by catecholamines in rats experiencing osmotic or volumetric challenges is mediated via the porto-hepatic system.
- Unlike food intake inhibition, water intake inhibition by catecholamines does not involve a beta-adrenergic component.
More Related Videos
11:08Novel Approach for Simultaneous Recording of Renal Sympathetic Nerve Activity and Blood Pressure with Intravenous Infusion in Conscious, Unrestrained Mice.
Published on: February 14, 2018
12:43Rodent Working Heart Model for the Study of Myocardial Performance and Oxygen Consumption
Published on: August 16, 2016
Related Concept Videos
01:25Adrenergic Agonists: Indirect-Acting Agents
Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
01:17Antihypertensive Drugs: Action of β1 Blockers
β1-receptors are primarily located in the heart and kidneys. In cardiac myocytes, these receptors interact with neurotransmitters released by the sympathetic nervous system during heightened activity or danger. As a result, β1-receptors get activated, initiating a series of biochemical processes. Excessive activation of beta receptors due to chronic stress can abnormally increase heart rate and contractility, resulting in high blood pressure or hypertension. To counteract this, β1-blockers...
01:17Hormonal Regulation of Blood Pressure
Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
01:25Regulation of Water Intake
Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
01:26Regulation of Water Output
The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
01:22Diabetes Insipidus II: Pathophysiology
Normally, water balance is maintained through three interconnected mechanisms: the hypothalamic thirst center, the synthesis and release of antidiuretic hormone (ADH, or vasopressin), and the kidneys' responsiveness to this hormone. ADH is synthesized in the hypothalamus, released from the posterior pituitary, and acts on the distal nephron, allowing water reabsorption and concentrated urine production.Diabetes Insipidus and Its TypesIn diabetes insipidus (DI), this regulatory system is...