Also known as Arginine vasopressin · AVP · Antidiuretic hormone · ADH · Vasostrict · Desmopressin (analog)
The body’s water-conservation hormone — a 9-amino-acid posterior-pituitary peptide, near-twin of oxytocin, used as a vasopressor and (as desmopressin) for diabetes insipidus.
Research refreshed
Vasopressin is a cyclic nonapeptide released from the posterior pituitary that controls how much water the kidney retains and constricts blood vessels. It differs from oxytocin by only two residues, yet does an entirely different job — a textbook example of how a tiny sequence change repurposes a hormone. In the clinic the native hormone (Vasostrict) is a vasopressor for refractory shock, while its engineered analog desmopressin (dDAVP) treats central diabetes insipidus, bedwetting, and some bleeding disorders.
Vasopressin and oxytocin are the two posterior-pituitary nonapeptides, structurally almost identical — they differ at only two of nine positions and share the same disulfide-closed ring — but functionally distinct. That near-identity is a classic illustration of how peptide hormones diversify: gene duplication of an ancestral nonapeptide, then a few substitutions that switch receptor preference and physiological role.
Its central job is water balance. When the body is dehydrated, vasopressin tells the kidney to reabsorb water, concentrating the urine; failure of this signal — from the pituitary (central) or the kidney (nephrogenic) — causes diabetes insipidus, with copious dilute urine and thirst. The V2-selective analog desmopressin restores that signal in central diabetes insipidus and is also used for nocturnal enuresis and to raise clotting factors in mild hemophilia and von Willebrand disease.
The native hormone’s second face is vascular. Through V1a receptors it constricts blood vessels, which is why a vasopressin infusion (Vasostrict) is used to raise blood pressure in septic and other vasodilatory shock when catecholamines alone are not enough. One molecule, two receptor systems, two very different clinical uses — selected apart by which analog you reach for.
Agonist at the V2 receptor in the renal collecting duct (inserting aquaporin-2 water channels to concentrate urine) and the V1a receptor on vascular smooth muscle (vasoconstriction). Desmopressin is V2-selective, giving the antidiuretic effect without the pressor action.
Behind every vial of Vasopressin is the same exacting pipeline every research peptide runs — but the chemistry plays out differently for this molecule. Here is how Vasopressin, specifically, is brought into being.
On paper, Vasopressin weighs in at roughly 1,084.2 daltons. Before a single bond is made, the target sequence, salt form, and purity threshold are written down as the contract the finished material must meet.
Vasopressin's chain is short but unusual — it carries non-natural residues that help it resist enzymatic breakdown, but demand specialized, costlier building blocks and careful coupling on the synthesizer. It also carries cyclization and a disulfide bridge, extra steps beyond a plain chain that add both capability and cost.
The crude mixture — Vasopressin plus its deletions and side products — is then separated on preparative HPLC, and where the cut is taken decides the difference between a genuinely pure peptide and a barely-passable one.
A real batch of Vasopressin proves itself: identity confirmed by mass spectrometry against its ~1,084.2 Da, purity read directly off an analytical HPLC trace, water and counterion content measured. That batch-specific certificate of analysis is the only honest way to know what is actually in a vial of Vasopressin — and a short, cold, accountable chain of custody is how that purity survives the trip to your bench.
A nonapeptide built by solid-phase synthesis and then oxidatively folded to close its single 1–6 disulfide, with a C-terminal amide. The synthetically interesting object is the analog: desmopressin (dDAVP) re-engineers the hormone with a deaminated position 1 and a D-arginine at position 8 — a stereochemical substitution that resists aminopeptidase cleavage, strips out the V1a pressor activity, and extends the half-life. It is a compact lesson in how D-amino acids and end-group edits convert a labile hormone into a dosable drug. Identity and disulfide connectivity are the key release tests.
Don't judge a vial by its cake. A fluffy, good-looking lyophilized powder reflects bulking agents and freeze-drying parameters — not purity. Insist on a batch-specific certificate of analysis.
Recent clinical trials and publications mentioning Vasopressin, pulled automatically from ClinicalTrials.gov and PubMed and refreshed daily. Listings are unfiltered search results, not curated endorsements.
It conserves body water by making the kidney reabsorb it (its "antidiuretic" action) and it constricts blood vessels. As a drug, native vasopressin is used as a vasopressor in shock, and its analog desmopressin treats central diabetes insipidus.
They are near-twins — both 9-amino-acid posterior-pituitary hormones that differ at only two positions — yet vasopressin governs water balance and blood pressure while oxytocin governs labor and bonding.
Desmopressin (dDAVP) is a synthetic vasopressin analog engineered to act selectively at the V2 receptor, giving the water-retaining effect without raising blood pressure. It is used for central diabetes insipidus, bedwetting, and some bleeding disorders.
No — this is a research and educational reference, not dosing guidance. Vasopressin and its analogs are prescription medicines.
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