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Regional specificity in alterations of rat brain copper and catecholamines following perinatal copper deficiency
1Department of Biochemistry and Molecular Biology, School of Medicine, University of Minnesota, Duluth 55812.
Insights
Perinatal copper deficiency impairs rat brain development, significantly reducing copper and norepinephrine levels regionally. Dopamine levels also changed, particularly in the hypothalamus, highlighting diet
Area of Science:
- Neuroscience
- Developmental Biology
- Nutritional Science
Background:
- Perinatal copper deficiency can impact brain development and function.
- Copper is essential for various enzymatic processes, including those involved in neurotransmitter synthesis.
- Understanding these effects is crucial for identifying potential health risks associated with nutritional imbalances during development.
Purpose of the Study:
- To investigate the effects of perinatal copper deficiency on regional brain copper and catecholamine levels in Sprague-Dawley rats.
- To determine if copper deficiency affects specific neurotransmitter systems in the developing brain.
Main Methods:
- Sprague-Dawley rats were fed a low-copper diet from gestation day 7.
- Brain copper levels were measured using graphite furnace atomic absorption spectroscopy.
- Catecholamine levels (norepinephrine and dopamine) were analyzed using High-Performance Liquid Chromatography (HPLC).
Main Results:
- Copper-deficient offspring exhibited impaired growth and significantly reduced liver copper levels.
- Brain copper levels were uniformly reduced across most regions, with notable exceptions in the hypothalamus.
- Significant reductions in norepinephrine were observed in multiple brain regions, while dopamine levels showed region-specific changes, particularly in males.
Conclusions:
- Perinatal copper deficiency leads to region-selective alterations in brain copper and catecholamine levels.
- These changes suggest a potential disruption of neurotransmitter systems critical for brain function.
- The findings underscore the importance of adequate copper intake during perinatal development.
Abstract:
Perinatal copper deficiency was studied in 1-month-old female and male Sprague-Dawley rat offspring to investigate regional changes in brain copper and catecholamine levels. Offspring of dams given the low copper treatment beginning at day 7 of gestation exhibited signs characteristic of deficiency such as impaired growth and 10-fold lower liver copper levels compared with copper-adequate controls. Regional analysis of brain copper by graphite furnace atomic absorption spectroscopy revealed uniform and severe reduction of copper to levels 20 +/- 3% of controls in all regions, except the hypothalamus, where reductions to 56 and 28% of those in copper-adequate females and males, respectively, were measured. HPLC analysis revealed significant reductions in norepinephrine levels in cerebrum, mid-brain, corpus striatum, cerebellum, and medulla-pons of copper-deficient offspring ranging between 39 and 67% of control values. There were no significant differences in norepinephrine concentration in the hypothalamus. There was a significant, one-third reduction of dopamine in the corpus striatum of copper-deficient male rats. Consistent with altered in vivo dopamine beta-monooxygenase activity, there were five-, three-, and twofold elevations of dopamine in cerebellum, medulla-pons, and hypothalamus of copper-deficient rats. Spectrophotometric measurement of in vitro dopamine beta-monooxygenase activity of brain and adrenal homogenates was higher in copper-deficient rats, confirming prior work. An explanation for the in vitro data is unclear. Changes in copper and catecholamine levels were influenced by diet and were regionally selective, especially in the hypothalamus.