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Related Experiment Videos

Inositol uptake in rat aorta.

R M Rapoport1, C Van Gorp, K C Chang

  • 1Department of Pharmacology and Cell Biophysics, University of Cincinnati College of Medicine, Ohio 45267-0575.

Life Sciences
|January 1, 1990
PubMed
Summary

Inositol uptake into rat thoracic aorta involves a sodium-dependent, carrier-mediated process. This pathway is inhibited by alpha-1 adrenoceptor agonists, impacting vascular smooth muscle function.

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Area of Science:

  • Cardiovascular Biology
  • Cellular Physiology
  • Molecular Transport Mechanisms

Background:

  • Inositol is crucial for cellular signaling and membrane structure.
  • Understanding its transport mechanism in vascular tissues is vital for cardiovascular health research.

Purpose of the Study:

  • To elucidate the mechanism of inositol uptake in rat thoracic aorta.
  • To identify the specific transporters and regulatory factors involved.

Main Methods:

  • Utilized radiolabeled 3H-inositol to quantify uptake in deendothelialized rat thoracic aorta.
  • Investigated the effects of varying sodium concentrations, inhibitors (LiCl, ouabain, phloretin, dinitrophenol), and pharmacological agents (norepinephrine, isobutylmethylxanthine, forskolin, etc.).

Main Results:

  • Inositol uptake exhibited both saturable (Na(+)-dependent) and nonsaturable (Na(+)-independent) components.
  • The Na(+)-dependent component showed Michaelis-Menten kinetics (Km=50 microM, Vmax=289 pmol/mg prot/h).
  • Uptake was inhibited by ouabain, LiCl, dinitrophenol, phloretin, and norepinephrine, suggesting carrier mediation and alpha-1 adrenoceptor involvement.

Conclusions:

  • Inositol transport into vascular smooth muscle is primarily mediated by a Na(+)-dependent carrier system.
  • Alpha-1 adrenoceptor agonists significantly inhibit this crucial inositol uptake pathway.

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