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Diabetes-induced biochemical changes in central and peripheral catecholaminergic systems
M Gallego1, R Setién, M J Izquierdo
1Department of Physiology, School of Pharmacy, University of the Basque Country, Bilbao, Spain.
Physiological Research
|December 4, 2003
Summary
Diabetes significantly impacts the nervous system, specifically reducing dopamine in the nigrostriatal pathway. This study details changes in catecholamine levels across various tissues in diabetic animals.
Area of Science:
- Neuroscience
- Endocrinology
- Biochemistry
Background:
- Diabetic neuropathy encompasses diverse nervous system alterations in diabetic individuals.
- Previous studies show conflicting results regarding catecholamine levels in diabetic animals.
- Variations in findings are attributed to differences in tissue selection, diabetes severity, and duration.
Purpose of the Study:
- To investigate the specific alterations in catecholamine systems within diabetic animal models.
- To precisely quantify dopamine, norepinephrine, and epinephrine levels in various tissues.
Main Methods:
- Extraction of dopamine, norepinephrine, and epinephrine from diverse tissues using alumina absorption.
- Quantification of extracted catecholamines via high-performance liquid chromatography with electrochemical detection.
Main Results:
- Diabetes specifically reduces dopamine content in the nigrostriatal system.
- Norepinephrine levels increase in cardiac ventricles but decrease in stellate ganglia and serum; no change in the central nervous system.
- Epinephrine increases in the adrenal gland and decreases in serum.
Conclusions:
- Diabetes diminishes the activity of the nigrostriatal dopaminergic system.
- Sympathoadrenal changes suggest reduced synthesis and increased storage of norepinephrine and epinephrine due to decreased release.