The effects of age on human venous responsiveness to neuropeptide Y

Br J Clin Pharmacol. 1999 Jan;47(1):83-9. doi: 10.1046/j.1365-2125.1999.00852.x.


Aims: Neuropeptide Y (NPY) is a sympathetic neurotransmitter released with noradrenaline during sympathetic stimulation. Ageing has been shown to be associated with a reduction in alpha2 and beta-adrenoceptor mediated responses in veins, but it is not known whether NPY responsiveness is also altered with increasing age.

Methods: Using a dorsal hand vein technique, we examined NPY receptor responsiveness in 24 normal, healthy subjects (20-72 years; 10 males, 14 females). Graded infusions of NPY (25-2000 pmol min(-1)) were administered (5 min at each dose) into a dorsal hand vein. Venous distension at 45 mmHg was measured at 3-5 min of each infusion. Dose-response curves to NPY were constructed and the peak venoconstriction was calculated.

Results: Dose-dependent venoconstriction was seen in all but one subject. The peak venoconstriction observed with NPY was significantly and negatively correlated with the age of the normal subjects (r=-0.63, P<0.01). When subjects were ranked from youngest to oldest and divided into tertiles, (20-40 years, n = 8; 41-55 years, n = 8; 56-72 years, n = 8), mean dose-response curves were different with the oldest tertile being significantly less responsive (P<0.05). The peak venoconstriction observed (% of control) was 65.1+/-7.0, 46.5+/-9.4, and 24.4+/-4.8%, respectively. The oldest tertile had a significantly decreased peak venoconstriction compared with the youngest tertile (P<0.01). Infusion of NPY into a dorsal hand vein had no systemic effects on heart rate or blood pressure in any of the subjects studied.

Conclusions: Hand vein responsiveness to exogenously infused NPY in normal subjects is decreased as age increases. The reduction of NPY-receptor-mediated responses with age may influence sympathetic nervous system control of the venous system with advancing age.

Publication types

  • Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aging / physiology*
  • Dose-Response Relationship, Drug
  • Female
  • Hand / blood supply*
  • Humans
  • Male
  • Middle Aged
  • Neuropeptide Y / blood
  • Neuropeptide Y / pharmacology*
  • Norepinephrine / blood
  • Receptors, Neuropeptide Y / physiology*
  • Vasoconstriction / drug effects*
  • Vasomotor System / physiology*
  • Veins / drug effects*
  • Veins / innervation


  • Neuropeptide Y
  • Receptors, Neuropeptide Y
  • Norepinephrine