Vasopressin

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Vasopressin
File:Vasopressin labeled.png
Clinical data
Pronunciation/ˌvzˈprɛsɪn/
SynonymsArginine Vasopressin; Argipressin
ATC code
Physiological data
Source tissuesSupraoptic nucleus; Paraventricular nucleus of hypothalamus
Target tissuesSystem-wide
ReceptorsV1A, V1B, V2, OXTR
AgonistsFelypressin, Desmopressin
AntagonistsDiuretics
MetabolismPredominantly in the liver and kidneys
Pharmacokinetic data
Protein binding1%
MetabolismPredominantly in the liver and kidneys
Elimination half-life10-20 minutes
ExcretionUrine
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
E number{{#property:P628}}
ECHA InfoCard{{#property:P2566}}Lua error in Module:EditAtWikidata at line 36: attempt to index field 'wikibase' (a nil value).
Chemical and physical data
FormulaC46H65N15O12S2
Molar mass1,084.24 g·mol−1
3D model (JSmol)
Density1.6±0.1 g/cm3
VALUE_ERROR (nil)
Identifiers
Aliases
External IDsGeneCards: [1]
Orthologs
SpeciesHumanMouse
Entrez
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RefSeq (mRNA)

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RefSeq (protein)

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Location (UCSC)n/an/a
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View/Edit Human

Vasopressin, also called antidiuretic hormone (ADH), arginine vasopressin (AVP) or argipressin,[1] is a hormone synthesized as a peptide prohormone in neurons in the hypothalamus, and is converted to AVP. It then travels down the axon of that cell, which terminates in the posterior pituitary, and is released from vesicles into the circulation in response to extracellular fluid hypertonicity (hyperosmolality). AVP has two primary functions. First, it increases the amount of solute-free water reabsorbed back into the circulation from the filtrate in the kidney tubules of the nephrons. Second, AVP constricts arterioles, which increases peripheral vascular resistance and raises arterial blood pressure.[2][3][4]

A third function is possible. Some AVP may be released directly into the brain from the hypothalamus, and may play an important role in social behavior, sexual motivation and pair bonding, and maternal responses to stress.[5]

Vasopressin induces differential of stem cells into cardiomyocytes and promotes heart muscle homeostasis.[6]

It has a very short half-life, between 16–24 minutes.[4]

Physiology

Function

Vasopressin regulates the tonicity of body fluids. It is released from the posterior pituitary in response to hypertonicity and causes the kidneys to reabsorb solute-free water and return it to the circulation from the tubules of the nephron, thus returning the tonicity of the body fluids toward normal. An incidental consequence of this renal reabsorption of water is concentrated urine and reduced urine volume. AVP released in high concentrations may also raise blood pressure by inducing moderate vasoconstriction.

AVP also may have a variety of neurological effects on the brain. It may influence pair-bonding in voles. The high-density distributions of vasopressin receptor AVPr1a in prairie vole ventral forebrain regions have been shown to facilitate and coordinate reward circuits during partner preference formation, critical for pair bond formation.[7]

A very similar substance, lysine vasopressin (LVP) or lypressin, has the same function in pigs and is used in human AVP deficiency.[8]

Kidney

Vasopressin has three main effects which are

  1. Increasing the water permeability of initial and cortical collecting tubules (ICT & CCT), as well as outer and inner medullary collecting duct (OMCD & IMCD) in the kidney, thus allowing water reabsorption and excretion of more concentrated urine, i.e., antidiuresis. This occurs through increased transcription and insertion of water channels (Aquaporin-2) into the apical membrane of collecting tubule and collecting duct epithelial cells. [9] Aquaporins allow water to move down their osmotic gradient and out of the nephron, increasing the amount of water re-absorbed from the filtrate (forming urine) back into the bloodstream. Important for bowen students, this effect is mediated by V2 receptors. Vasopressin also increases the concentration of calcium in the collecting duct cells, by episodic release from intracellular stores. Vasopressin, acting through cAMP, also increases transcription of the aquaporin-2 gene, thus increasing the total number of aquaporin-2 molecules in collecting duct cells.[citation needed]
  2. Increasing permeability of the inner medullary portion of the collecting duct to urea by regulating the cell surface expression of urea transporters,[10] which facilitates its reabsorption into the medullary interstitium as it travels down the concentration gradient created by removing water from the connecting tubule, cortical collecting duct, and outer medullary collecting duct.
  3. Acute increase of sodium absorption across the ascending loop of henle. This adds to the countercurrent multiplication which aids in proper water reabsorption later in the distal tubule and collecting duct.[11]

Central nervous system

Vasopressin released within the brain may have several actions:

  • Vasopressin is released into the brain in a circadian rhythm by neurons of the suprachiasmatic nucleus.[12]
  • Vasopressin released from centrally projecting hypothalamic neurons is involved in aggression, blood pressure regulation, and temperature regulation.[citation needed]-->
  • Recent evidence suggests that vasopressin may have analgesic effects. The analgesia effects of vasopressin were found to be dependent on both stress and sex.[13]

Regulation

Many factors influence the secretion of vasopressin:

  • Ethanol (alcohol) reduces the calcium-dependent secretion of AVP by blocking voltage-gated calcium channels in neurohypophyseal nerve terminals in rats.[14]
  • Angiotensin II stimulates AVP secretion, in keeping with its general pressor and pro-volumic effects on the body.[15]
  • Atrial natriuretic peptide inhibits AVP secretion, in part by inhibiting Angiotensin II-induced stimulation of AVP secretion.[15]
  • Cortisol inhibits secretion of antidiuretic hormone.[16]

Production and secretion

The physiologic stimulus for secretion of vasopressin is increased osmolality of the plasma, monitored by the hypothalamus. A decreased arterial blood volume, (such as can occur in cirrhosis, nephrosis and heart failure), stimulates secretion, even in the face of decreased osmolality of the plasma: it supersedes osmolality, but with a milder effect. In other words, vasopressin is secreted in spite of the presence of hypoosmolality (hyponatremia) when the arterial blood volume is low.

The AVP that is measured in peripheral blood is almost all derived from secretion from the posterior pituitary gland (except in cases of AVP-secreting tumours). Vasopressin is produced by magnocellular neurosecretory neurons in the Paraventricular nucleus of hypothalamus (PVN) and Supraoptic nucleus (SON). It then travels down the axon through the infundibulum within neurosecretory granules that are found within Herring bodies, localized swellings of the axons and nerve terminals. These carry the peptide directly to the posterior pituitary gland, where it is stored until released into the blood.

There are other sources of AVP, beyond the hypothalamic magnocellular neurons. For example, AVP is also synthesized by parvocellular neurosecretory neurons of the PVN, transported and released at the median eminence, from which it travels through the hypophyseal portal system to the anterior pituitary, where it stimulates corticotropic cells synergistically with CRH to produce ACTH (by itself it is a weak secretagogue).[17]

Vasopressin during surgery and anaesthesia

Vasopressin is used for measurement of surgical stress at evaluation of surgical techniques. Plasma vasopressin concentration is elevated at noxious stimuli,[18] predominantly during abdominal surgery,[19][20][21] especially at gut manipulation and traction of viscera.[22][23][24]

In a study on dogs, plasma vasopressin concentration increased at removal of both ovaries, with a 15 minute pause between ovary removal. Blood pressure and vasopressin concentrations changed in parallel at use of z‐scores (standard scores) for comparison.[25]

In a human study, two different approaches for lumbar spine surgery were compared. An intraoperative increase of vasopressin levels was observed in one of the groups and this group required more postoperative analgesics.[26]

File:Blood pressure and Vasopressin at removal of ovaries, Z-scores.jpg
Z‐scores (standard scores) for blood pressure and plasma vasopressin in 10 dogs subjected to ovariohysterectomy.[27] Blood pressure and vasopressin concentrations changed in parallel. Sample 1, before incision, sample 2 was collected before removal of the 1st ovary, sample 3 after removal of the 1st ovary, sample 4 after a pause and before removal of the 2nd ovary, sample 5 after removal of the 2nd ovary. Z‐scores compare and illustrate various variables and how data points deviate from the mean by use of each variable's standard deviations.[28]

Receptors

The following describes the actions of AVP:

Type Second messenger system Locations Actions Agonists Antagonists
AVPR1A Phosphatidylinositol/calcium Liver, kidney, peripheral vasculature, brain Vasoconstriction, gluconeogenesis, platelet aggregation, and release of factor VIII and von Willebrand factor; social recognition,[29] circadian tau[30] Felypressin
AVPR1B or AVPR3 Phosphatidylinositol/calcium Pituitary gland, brain Adrenocorticotropic hormone secretion in response to stress;[31] social interpretation of olfactory cues[32]
AVPR2 Adenylate cyclase/cAMP Basolateral membrane of the cells lining the collecting ducts of the kidneys (especially the cortical and outer medullary collecting ducts) Insertion of aquaporin-2 (AQP2) channels (water channels). This allows water to be reabsorbed down an osmotic gradient, and so the urine is more concentrated. Release of von Willebrand factor and surface expression of P-selectin through exocytosis of Weibel-Palade bodies from endothelial cells[33][34] AVP, desmopressin "-vaptan" diuretics, i.e. tolvaptan

Structure and relation to oxytocin

File:Vasopressin labeled.png
Chemical structure of the arginine vasopressin (argipressin) with an arginine at the 8th amino acid position. Lysine vasopressin differs only in having a lysine in this position.
File:Oxytocin with labels.png
Chemical structure of oxytocin

The vasopressins are peptides consisting of nine amino acids (nonapeptides). (NB: the value in the table above of 164 amino acids is that obtained before the hormone is activated by cleavage.) The amino acid sequence of arginine vasopressin (argipressin) is Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Arg-Gly-NH2, with the cysteine residues forming a disulfide bond and the C-terminus of the sequence converted to a primary amide.[35] Lysine vasopressin (lypressin) has a lysine in place of the arginine as the eighth amino acid, and is found in pigs and some related animals, whereas arginine vasopressin is found in humans.[36]

The structure of oxytocin is very similar to that of the vasopressins: It is also a nonapeptide with a disulfide bridge and its amino acid sequence differs at only two positions (see table below). The two genes are located on the same chromosome separated by a relatively small distance of less than 15,000 bases in most species. The magnocellular neurons that secrete vasopressin are adjacent to magnocellular neurons that secrete oxytocin, and are similar in many respects. The similarity of the two peptides can cause some cross-reactions: oxytocin has a slight antidiuretic function, and high levels of AVP can cause uterine contractions.[37][38]

Below is a table showing the superfamily of vasopressin and oxytocin neuropeptides:

Vertebrate Vasopressin Family
Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Arg-Gly-NH2 Argipressin (AVP, ADH) Most mammals
Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Lys-Gly-NH2 Lypressin (LVP) Pigs, hippos, warthogs, some marsupials
Cys-Phe-Phe-Gln-Asn-Cys-Pro-Arg-Gly-NH2 Phenypressin Some marsupials
Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Arg-Gly-NH2 Vasotocin Non-mammals
Vertebrate Oxytocin Family
Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Leu-Gly-NH2 Oxytocin (OXT) Most mammals, ratfish
Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Pro-Gly-NH2 Prol-Oxytocin Some New World monkeys, northern tree shrews
Cys-Tyr-Ile-Gln-Asn-Cys-Pro-Ile-Gly-NH2 Mesotocin Most marsupials, all birds, reptiles, amphibians, lungfishes, coelacanths
Cys-Tyr-Ile-Gln-Ser-Cys-Pro-Ile-Gly-NH2 Seritocin Frogs
Cys-Tyr-Ile-Ser-Asn-Cys-Pro-Ile-Gly-NH2 Isotocin Bony fishes
Cys-Tyr-Ile-Ser-Asn-Cys-Pro-Gln-Gly-NH2 Glumitocin skates
Cys-Tyr-Ile-Asn/Gln-Asn-Cys-Pro-Leu/Val-Gly-NH2 Various tocins Sharks
Invertebrate VP/OT Superfamily
Cys-Leu-Ile-Thr-Asn-Cys-Pro-Arg-Gly-NH2 Inotocin Locust
Cys-Phe-Val-Arg-Asn-Cys-Pro-Thr-Gly-NH2 Annetocin Earthworm
Cys-Phe-Ile-Arg-Asn-Cys-Pro-Lys-Gly-NH2 Lys-Connopressin Geography & imperial cone snail, pond snail, sea hare, leech
Cys-Ile-Ile-Arg-Asn-Cys-Pro-Arg-Gly-NH2 Arg-Connopressin Striped cone snail
Cys-Tyr-Phe-Arg-Asn-Cys-Pro-Ile-Gly-NH2 Cephalotocin Octopus
Cys-Phe-Trp-Thr-Ser-Cys-Pro-Ile-Gly-NH2 Octopressin Octopus
†Vasotocin is the evolutionary progenitor of all the vertebrate neurohypophysial hormones.[39]

Medical use

Vasopressin is used to manage anti-diuretic hormone deficiency. It has off-label uses and is used in the treatment of vasodilatory shock, gastrointestinal bleeding, ventricular tachycardia and ventricular fibrillation. Vasopressin is used to treat diabetes insipidus related to low levels of antiduretic hormone. It is available as Pressyn.[40]

Vasopressin agonists are used therapeutically in various conditions, and its long-acting synthetic analogue desmopressin is used in conditions featuring low vasopressin secretion, as well as for control of bleeding (in some forms of von Willebrand disease and in mild haemophilia A) and in extreme cases of bedwetting by children. Terlipressin and related analogues are used as vasoconstrictors in certain conditions. Use of vasopressin analogues for esophageal varices commenced in 1970.[41]

Vasopressin infusions are also used as second line therapy for septic shock patients not responding to fluid resuscitation or infusions of catecholamines (e.g., dopamine or norepinephrine) to increase the blood pressure while sparing the use of catecholamines. These argipressins have much shorter elimination half-life (around 20 minutes) comparing to synthetic non-arginine vasopresines with much longer elimination half-life of many hours. Further, argipressins act on V1a, V1b, and V2 reseptors which consequently lead to higher eGFR and lower vascular resistance in the lungs. A number of injectable arginine vasopressins are currently in clinical use in the United States and in Europe.

Pharmacokinetics

Vasopressin is administered through an intravenous device, intramuscular injection or a subcutaneous injection. The duration of action depends on the mode of administration and ranges from thirty minutes to two hours. It has a half life of ten to twenty minutes. It is widely distributed throughout the body and remains in the extracellular fluid. It is degraded by the liver and excreted through the kidneys.[40]. Arginin vasopressins for use in septic shock are intended for intravenous use only.

Side effects

The most common side effects during treatment with vasopressin are dizziness, angina, chest pain, abdominal cramps, heartburn, nausea, vomiting, trembling, fever, water intoxication, pounding sensation in the head, diarrhea, sweating, paleness, and flatulence. The most severe adverse reactions are myocardial infarction and hypersensitivy.[40]

Contraindications

The use of lysine vasopressin is contraindicated in the presence of hypersentivity to beef or pork proteins, increased BUN and chronic renal failure. It is recommended that it be cautiously used in instances of perioperative polyuria, sensitivity to the drug, asthma, seizures, heart failure, a comatose state, migraine headaches, and cardiovascular disease.[40]

Interactions

Role in disease

There may be a connection between arginine vasopressin and autism.[42]

Deficiency

Decreased AVP release (neurogenic — i.e. due to alcohol intoxication or tumour) or decreased renal sensitivity to AVP (nephrogenic, i.e. by mutation of V2 receptor or AQP) leads to diabetes insipidus, a condition featuring hypernatremia (increased blood sodium concentration), polyuria (excess urine production), and polydipsia (thirst).

Excess

Syndrome of Inappropriate Antidiuretic Hormone secretion (SIADH) in turn can be caused by a number of problems. Some forms of cancer can cause SIADH, particularly small cell lung carcinoma but also a number of other tumors. A variety of diseases affecting the brain or the lung (infections, bleeding) can be the driver behind SIADH. A number of drugs has been associated with SIADH, such as certain antidepressants (serotonin reuptake inhibitors and tricyclic antidepressants), the anticonvulsant carbamazepine, oxytocin (used to induce and stimulate labor), and the chemotherapy drug vincristine. It has also been associated with fluoroquinolones (including ciprofloxacin and moxifloxacin).[4] Finally, it can occur without a clear explanation.[43] Hyponatremia can be treated pharmaceutically through the use of vasopressin receptor antagonists.[43]

History

Vasopressin was elucidated and synthesized for the first time by Vincent du Vigneaud.

Animal studies

Evidence for an effect of AVP on monogamy vs promiscuity comes from experimental studies in several species, which indicate that the precise distribution of vasopressin and vasopressin receptors in the brain is associated with species-typical patterns of social behavior. In particular, there are consistent differences between monogamous species and promiscuous species in the distribution of AVP receptors, and sometimes in the distribution of vasopressin-containing axons, even when closely related species are compared.[44]

Human studies

Vasopressin has shown nootropic effects on pain perception and cognitive function.[45] Vasopressin also plays a role in autism, major depressive disorder, bipolar disorder, and schizophrenia.[46]

See also

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Further reading