vasopressin


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Related to vasopressin: epinephrine, oxytocin

vasopressin

(văz'ōprĕs`ĭn): see antidiuretic hormoneantidiuretic hormone
, polypeptide hormone secreted by the posterior pituitary gland. Its principal action is to regulate the amount of water excreted by the kidneys. Antidiuretic hormone (ADH), known also as vasopressin, causes the kidneys to resorb water directly from the
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Vasopressin

 

a hormone secreted by the posterior lobe of the hypophysis; causes constriction of vessels (acting on the smooth muscles of their walls) and increased blood pressure (pressor effect); also maintains at a proper level the reverse absorption of water in the straight tubules of the kidneys, that is, decreases the quantity of urine discharged (antidiuretic effect). Vasopressin is formed in the neurosecretory cells of the anterior nuclei of the hypothalmus, from which it enters the hypophysis along the nerve fibers. The antidiuretic action of the hormone is one of the factors that maintain the relative constancy of the water-salt metabolism in the bodies of vertebrate animals and man. A deficiency of vasopressin may lead to diabetes insipidus, in which discharge of urine is sharply increased. Vasopressin is contained in preparations obtained from the posterior hypophysis—Pituitrin and adiurekrin. Chemically, vasopressin is an octapeptide constructed of eight amino acids (in the majority of animals and in humans vasopressin consists of cysteine, tyrosine, phenylalanine, glutamine, asparagin, proline, arginine, and glycine; in pigs lysine is found instead of arginine). In structure and effect vasopressin is similar to another hormone of the hypophysis—oxytocin.

G. N. KASSIL’

vasopressin

[‚vā·zō′pres·ən]
(biochemistry)
A peptide hormone which is elaborated by the posterior pituitary and which has a pressor effect; used medicinally as an antidiuretic. Also known as antidiuretic hormone (ADH).
References in periodicals archive ?
Previous work shows dog-human friendly interactions can create a release in oxytocin in dogs, and when dogs interact with people, we see that their vasopressin levels go down over time,"says MacLean.
3 Arginine vasopressin receptor 1a (AVPR1A) antagonist can block the vasoconstrictor effect.
Later, Vigneaud and Turner isolated vasopressin and proved that the same neurohypophyseal hormone possessed both antidiuretic and vasopressor activity.
Proceedings: The release of plasminogen activator and factor VIII to lysine vasopressin, arginine vasopressin, I-desamino-8-d-arginine vasopressin, angiotensin and oxytocin in man.
Copeptin, a stable peptide derived from the vasopressin precursor, is elevated in serum of sepsis patients.
Excessive circulating levels of vasopressin results in hyponatremia by decreasing renal free water excretion.
In the case group, before hydrodissection, vasopressin was prepared by dilution of one ampoule (20 units) of Hypress[R] (Exir Pharmaceutical Co.
2 g/kg, orally, 21 days) also decreased the content of arginine vasopressin (AVP) in the pituitary and the expression of AVP mRNA in hypothalamus compared with the stress control group.
Other omissions relevant to intensive care and cardiac anaesthetic practice include vasopressin, terlipressin, sildenafil and bosentan.
To minimize blood loss, a dilute solution of vasopressin (30 U of vasopressin in 100 cc of normal saline) is placed in the myoma bed via an 18-gauge spinal needle placed percutaneously through a small skin nick.
Researchers have found that a neurotransmitter known as vasopressin is connected to altruism.
But another neurotransmitter, called vasopressin, strengthens the bonding experience.