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Related Experiment Videos

Adenosine kinetics in canine coronary circulation

K Kroll1, D W Stepp

  • 1Center for Bioengineering, University of Washington, Seattle 98195, USA.

The American Journal of Physiology
|April 1, 1996
PubMed
Summary

Investigating adenosine kinetics in canine coronary circulation using multiple-indicator dilution, this study reveals significant endothelial cell uptake and transport, estimating interstitial adenosine concentrations between 100-220 nM.

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Area of Science:

  • Cardiovascular Physiology
  • Pharmacology
  • Biophysics

Background:

  • Adenosine plays a crucial role in regulating coronary blood flow.
  • Understanding adenosine kinetics is vital for comprehending its physiological effects and therapeutic potential.
  • Previous studies have limited quantitative data on adenosine transport and metabolism within the coronary circulation.

Purpose of the Study:

  • To quantitatively investigate adenosine kinetics in the coronary circulation of dogs.
  • To determine the permeability-surface area product and consumption capacity of endothelial cells for adenosine.
  • To estimate the in vivo interstitial adenosine concentration under physiological conditions.

Main Methods:

  • Utilized multiple-indicator dilution experiments with simultaneous intracoronary bolus injections of radiolabeled tracers ([125I]albumin, [14C]sucrose, [3H]adenosine).
  • Measured dilution curves in coronary venous blood using automated sampling, HPLC, and isotope detection.
  • Employed optimized mathematical modeling, residual analysis, sensitivity analysis, and Monte Carlo simulations for parameter estimation and validation.

Main Results:

  • Only 1% of injected adenosine was recovered in coronary venous blood, indicating significant uptake.
  • Adenosine dilution curves peaked 2-4 seconds earlier than reference tracers, suggesting rapid transport and/or metabolism.
  • Model fits required high endothelial cell permeability-surface area product and consumption capacity, alongside flow heterogeneity.
  • Estimated in vivo interstitial adenosine concentration ranged from 100-220 nM.

Conclusions:

  • The coronary endothelium exhibits substantial capacity for adenosine transport and/or metabolism.
  • Multiple-indicator dilution combined with modeling provides reliable estimates of adenosine kinetics.
  • The estimated interstitial adenosine concentration suggests a significant local pool influencing coronary physiology.

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