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Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
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Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues

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5-HT1B receptor subtype and aging in rat resistance vessels

Guglielmina Froldi1, Monica Montopoli, Miriam Zanetti

  • 1Department of Pharmacology and Anaesthesiology, University of Padova, Padova, Italy. g.froldi@unipd.it

Pharmacology
|October 6, 2007
PubMed

Insights

Aging enhances the

Area of Science:

  • Pharmacology
  • Neuroscience
  • Cardiovascular Research

Background:

  • The 5-hydroxytryptamine (5-HT) system plays a crucial role in vascular function.
  • The 5-HT(1B) receptor subtype is often considered 'silent' due to low basal activity.
  • Understanding factors that enhance 5-HT(1B) receptor activity is key for therapeutic development.

Purpose of the Study:

  • To identify experimental conditions that enhance the activity of the 'silent' 5-HT(1B) receptor subtype.
  • To investigate the influence of aging on 5-HT receptor function in rat caudal arteries.
  • To establish a pharmacological model for studying the 5-HT(1B) receptor.

Main Methods:

  • Vascular responses to 5-HT receptor agonists (5-HT, 5-carboxamidotryptamine, sumatriptan) were measured in rat caudal arteries.
  • Experimental conditions included reserpine treatment and potassium (K+) depolarization.
  • Selective receptor antagonists (ritanserin for 5-HT(2A), SB-224289 for 5-HT(1B)) and RT-PCR were employed.

Main Results:

  • Reserpine treatment and K+ depolarization significantly increased vasoconstriction mediated by 5-HT receptor agonists.
  • Aging shifted the concentration-vasoconstriction curve for sumatriptan, increasing maximal contractile response, particularly in reserpine-treated tissues.
  • RT-PCR confirmed age-related changes in 5-HT(1B) and 5-HT(2A) receptor expression.

Conclusions:

  • Reserpine-treated and K+-depolarized caudal arteries from aged rats provide a valuable model for studying the 'silent' 5-HT(1B) receptor.
  • Aging significantly modulates the functional expression and responsiveness of the 5-HT(1B) receptor.
  • These findings have implications for understanding age-related vascular changes and developing targeted therapies.

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