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Impact of streptozotocin on altering normal glucose homeostasis during insulin testing in diabetic rats compared to

Nidal A Qinna1, Adnan A Badwan2

  • 1Department of Pharmacology and Biomedical Sciences, Faculty of Pharmacy and Medical Sciences, University of Petra, Amman, Jordan.

Drug Design, Development and Therapy
|May 26, 2015
PubMed

Insights

Streptozotocin (STZ) causes varied disruptions in glucose homeostasis. Selecting consistent STZ-induced diabetic rat models is crucial for accurate antidiabetic drug and insulin testing.

Area of Science:

  • Endocrinology
  • Pharmacology
  • Toxicology

Background:

  • Streptozotocin (STZ) is a common diabetogenic agent for preclinical drug testing.
  • STZ's impact on organs beyond the pancreas can affect glucose homeostasis.
  • Variability in STZ-induced diabetes models may influence experimental outcomes.

Purpose of the Study:

  • To reassess STZ's action in creating diverse glucose response states in diabetic rats.
  • To investigate the influence of initial blood glucose levels on STZ-induced diabetic models.
  • To evaluate the pharmacokinetic and pharmacodynamic effects of insulin in STZ-treated rats.

Main Methods:

  • Diabetic Sprague-Dawley rats were induced with STZ and classified by blood glucose levels.
  • Liver, pancreas, and kidney functions were assessed.
  • Pharmacokinetic and pharmacodynamic actions of insulin were compared in diabetic and non-diabetic rats.
  • Insulin and oral glucose challenges were administered to STZ-diabetic rats.

Main Results:

  • Diabetic rats showed higher responsiveness to insulin compared to non-diabetic rats.
  • STZ induced variable disruptions in glucose homeostasis.
  • Higher initial glucose levels (451-750 mg/dL) in STZ-diabetic rats correlated with liver and kidney function changes.
  • Insulin pharmacokinetics and pharmacodynamics were altered in STZ-diabetic rats with varying glucose levels.

Conclusions:

  • STZ can induce different degrees of glucose homeostasis disruption.
  • Diabetic animals exhibit enhanced insulin sensitivity.
  • Standardized initial glucose levels are essential for STZ-based experimental models to ensure reliable antidiabetic drug and insulin delivery system evaluations.
Keywords:
animal modelantidiabetic agentsdiabetes mellitusexperimentalprotein deliverystreptozotocin

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