Ex Vivo Method to Simultaneously Evaluate Glucose Utilization, Uptake, and Production in Rat Liver

Area of Science:

• * Physiology
• * Biochemistry
• * Pharmacology

Background:

• * Type 2 diabetes is characterized by hepatic dysfunction.
• * Current methods for assessing hepatic glucose metabolism are limited.
• * Understanding glucose metabolism is crucial for diabetes research.

Purpose of the Study:

• * To develop a novel ex vivo method for simultaneous evaluation of hepatic glucose utilization, uptake, and production.
• * To utilize this method to investigate hepatic impairment in diabetic models.
• * To assess the pharmacological effects of anti-diabetic agents on glucose metabolism.

Main Methods:

• * Perfusing the isolated rat liver (right lateral lobe) with Krebs-Henseleit buffer containing uniformly labeled ¹³C-glucose.
• * Measuring whole glucose concentration via colorimetric assay.
• * Quantifying [U-¹²C]-glucose and [U-¹³C]-glucose concentrations using Gas Chromatography-Mass Spectrometry (GC-MS) based on isotope abundance ratios.

Main Results:

• * The method successfully differentiated between hepatic glucose utilization, uptake, and production.
• * Hepatic glucose utilization and uptake were determined by the difference in whole glucose and ¹³C-glucose concentrations.
• * Hepatic glucose production was quantified by measuring the concentration of unlabeled ¹²C-glucose in the perfusate.

Conclusions:

• * The developed ex vivo method enables simultaneous assessment of key hepatic glucose metabolism parameters.
• * This technique provides insights into the mechanisms of hepatic impairment in diabetic animals.
• * The method is valuable for pathophysiological and pharmacological research in type 2 diabetes.