Abstract
The concentrations of noradrenaline (NA), adrenaline (ADR), 5-hydroxyindoleacetic acid (5-HIAA), serotonin (5-HT) and dopamine (DOP) have been studied in the left ventricle and the left adrenal gland of control and streptozotocin (STZ) – treated rats at various intervals (12, 24, 30, 34, 38 and 42 weeks) after the induction of diabetes. The only amines detected in the heart were NA, 5-HIAA and DOP, whereas those detected in the adrenal gland were NA and ADR. Differential changes in the catecholamine concentrations occurred in the heart and the adrenal gland at different stages of the metabolic disorder. In the heart the initial changes in short-term diabetes included an increase in NA concentration but this did not persist in the longer term diabetic animals (30–38 weeks following STZ injection). In the adrenal gland there was an initial reduction followed by a steady increase in the concentration of NA and ADR throughout the period of the study.
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