Vasopressin
Beeinflusst folgende Verhaltensweisen
- spielt eine wichtige Rolle für väterliches Verhalten und bevorzugte Partnerwahl in männlichen Lebewesen
- Soziales Verhalten (meistens in Lebewesen, die ohnehin zu prosoziales Verhalten tendieren, dabei hat ein höheres Vasopressin-Level keine Auswirkungen auf unsoziale Menschen)
- Lebewesen mit dauerhaft erhöhtem Vasopressin-Level haben stabilere monogame Beziehungen, engagiertere Erziehungen, können sich besser in nadere hineinversetzen, sind empathischer
Transclude of Genvarianten-von-Oxytocin-und-Vasopressin
🤖 AI addition (15/06/26):
Biochemistry and Synthesis
Vasopressin (AVP — arginine vasopressin; also called ADH, antidiuretic hormone) is a 9-amino-acid Neuropeptide structurally similar to oxytocin (they share 7 of 9 amino acids, diverging at positions 3 and 8). It is synthesized in two hypothalamic nuclei:
- Supraoptic nucleus (SON) — primarily for peripheral release
- Paraventricular nucleus (PVN) — for both peripheral release and central CNS projection
Labeled vasopressin (AVP) structure — the 9-amino-acid ring structure with C-terminal amide, essential for receptor bindingDual Role: Hormone + Neuropeptide
As a hormone (peripheral): Synthesized in SON/PVN, transported down axons to the posterior pituitary, released into bloodstream in response to:
- ↑ plasma osmolality (detected by hypothalamic osmoreceptors) — primary stimulus
- ↓ blood volume/pressure (detected by baroreceptors in heart, aorta)
- Nausea, pain, hypoglycemia, stress
As a neuropeptide (central): AVP neurons project from PVN to limbic structures, brainstem, spinal cord, mediating social and behavioral effects directly, without entering the bloodstream.
ADH Function: Water Retention via V2 Receptors
In the kidney, AVP acts on V2 receptors (Gs-coupled → cAMP → PKA):
- Inserts aquaporin-2 (AQP2) channels into the apical membrane of collecting duct principal cells
- ↑ water reabsorption → concentrated urine
- Net result: ↑ blood volume, ↓ plasma osmolality
Diabetes insipidus: Deficient AVP (central DI) or V2 receptor loss (nephrogenic DI) → massive dilute urine output (polyuria) and extreme thirst (polydipsia). Central DI treated with desmopressin (synthetic AVP analog).
AVP also acts on V1a receptors in vascular smooth muscle → vasoconstriction → ↑ blood pressure (especially in hemorrhagic shock).
V1a Receptor and Social Behavior
The behavioral effects described above are mediated primarily by V1a receptors in the brain (limbic system, lateral septum, bed nucleus of stria terminalis, hypothalamus):
The vole research paradigm: Prairie voles (monogamous) have high V1a receptor density in the nucleus accumbens (NAc) and ventral pallidum; meadow voles (promiscuous) do not. Transferring the prairie vole V1a receptor gene to meadow voles increases partner preference — a landmark finding linking receptor distribution to mating system.
Sex differences in AVP:
- Males generally have higher V1a receptor expression in key social brain regions (lateral septum, BNST, anterior hypothalamus) than females
- Androgens (testosterone) upregulate the vasopressin system in males — including both AVP synthesis and V1a receptor expression
- This explains why vasopressin’s pro-social effects are more pronounced in males, while oxytocin plays a larger role in female social bonding
- In humans: AVP is associated with mate-guarding behavior, jealousy, and territorial responses in males
AVP, CRH, and Stress
Under chronic stress, AVP co-secretion with CRH from PVN neurons increases, synergistically amplifying ACTH release. This AVP/CRH interaction is important in sustaining the stress response over time and may contribute to HPA dysregulation in depression.
See also
Superlink: 052 🫧Hormone und Neurotransmitter, 050 🧠Neuroscience
tags: HormoneNeurotransmitter science ai-generated
Quellen
→ Einordnung: Neurotransmitter vs Neuropeptide vs Hormone · Hormone – Overview · Neuropeptide · CRH
Erstellt: 17-07-21 09:19
Status: