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Related Experiment Videos

Tolrestat pharmacokinetics in rat peripheral nerve

D Dvornik1, J Millen, D R Hicks

  • 1Wyeth-Ayerst Research, Princeton, NJ 08543-8000.

Journal of Diabetes and Its Complications
|January 1, 1994
PubMed
Summary

The effectiveness of aldose reductase (AR) inhibitors for diabetic nerve damage hinges on drug levels within nerves. Tolrestat

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Area of Science:

  • Pharmacology
  • Diabetic Complications
  • Neuroscience

Background:

  • Diabetic polyneuropathy is a common complication of diabetes.
  • Aldose reductase (AR) inhibitors are investigated for treating diabetic polyneuropathy.
  • Clinical efficacy of AR inhibitors depends on their bioavailability at target sites in peripheral nerves.

Purpose of the Study:

  • To investigate the relationship between tolrestat concentration and its inhibition of AR-catalyzed polyol production in rat sciatic nerves.
  • To estimate the concentration of free tolrestat at the site of AR activity within the nerve.

Main Methods:

  • Galactosemic rats were administered tolrestat via gavage.
  • Rats were fed a galactose diet at various time points post-administration.
  • Nerve galactitol levels and composite tolrestat concentrations were measured.
  • In vitro studies were used to estimate free tolrestat concentration.

Main Results:

  • A significant correlation was found between composite tolrestat concentration in the nerve and the reduction in nerve galactitol.
  • The estimated concentration of free tolrestat at the site of AR activity was only 0.4% of the total measured nerve concentration.
  • Nerve galactitol levels reflect the extent of AR inhibition by tolrestat.

Conclusions:

  • The pharmacokinetics of AR inhibitors, including uptake, binding, and elimination within the nerve, are critical for their effectiveness.
  • A small fraction of the total drug concentration in the nerve is available at the site of AR inhibition.
  • Understanding nerve-specific pharmacokinetics is essential for developing effective AR inhibitors for diabetic polyneuropathy.

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