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Related Experiment Videos

Decrease in catechol-O-methyltransferase activity in the liver of streptozotocin-induced diabetic rats.

J P Wang1, I M Liu, T F Tzeng

  • 1Department of Orthopedics, Mackay Memorial Hospital, Taipei City, Taiwan.

Clinical and Experimental Pharmacology & Physiology
|May 16, 2002
PubMed
Summary
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Diabetic rats show reduced catechol- O-methyltransferase (COMT) activity in the liver and plasma. Normalizing blood glucose levels with insulin or phlorizin restored normal COMT activity, indicating hyperglycemia is the primary cause.

Area of Science:

  • Biochemistry
  • Endocrinology
  • Pharmacology

Background:

  • Catechol-O-methyltransferase (COMT) is crucial for neurotransmitter metabolism.
  • Streptozotocin (STZ)-induced diabetes in rats is a model for studying metabolic dysregulation.
  • Altered enzyme activity in diabetes can impact physiological processes.

Purpose of the Study:

  • To compare COMT activity in the liver and plasma of STZ-diabetic rats versus normal rats.
  • To investigate the effect of hyperglycemia on COMT activity.
  • To determine if normalizing glucose levels can reverse changes in COMT activity.

Main Methods:

  • STZ-induced diabetic rat model.
  • Measurement of noradrenaline metabolism to metanephrine (MN) using high-performance liquid chromatography with electrochemical detection.

Related Experiment Videos

  • Michaelis-Menten kinetic analysis of COMT activity.
  • Treatment with insulin or phlorizin to normalize plasma glucose.

    • Main Results:

    • STZ-diabetic rats exhibited decreased MN formation in the liver and lower MN levels in plasma compared to controls.
    • Liver COMT showed reduced maximum velocity (Vmax) and increased Km in diabetic rats.
    • Insulin or phlorizin treatment for 4 days normalized COMT activity in STZ-diabetic rats.

    Conclusions:

    • Hyperglycemia in STZ-diabetic rats significantly lowers COMT activity in the liver and plasma.
    • The observed decrease in COMT activity is primarily attributed to elevated plasma glucose levels.
    • Correction of hyperglycemia effectively reverses the reduction in COMT activity, highlighting glucose control's importance.