Journal
JOURNAL OF PSYCHIATRIC RESEARCH
Volume 43, Issue 8, Pages 754-762Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpsychires.2008.10.002
Keywords
Vitamin A supplementation; Clinical doses; Rat frontal cortex; Redox state; Bioenergetics; Depression
Categories
Funding
- CNPq
Ask authors/readers for more resources
Vitamin A and its derivatives, the retinoids, exert modulatory roles on central nervous system (CNS) function. However, the clinical use of vitamin A at moderate to high doses induces serious side effects. including dysfunctional brain metabolism and mood disorders. Then, we have investigated in this work the effects of vitamin A supplementation at 1000, 2500, 4500, or 9000 IU/kg/day for 28 days on redox and bioenergetics parameters in adult rat frontal cortex. Additionally, we have measured caspase-3 and caspase-8 activities to analyze whether vitamin A supplementation as retinol palmitate induces neuronal death in such brain area. The levels of the pro-inflammatory cytokine TNF-alpha were also quantified. We have found increased rates of O-2(-center dot) production and increased levels of markers of oxidative insult in frontal cortex and also in mitochondrial membranes. Superoxide dismutase (SOD) enzyme activity was increased, and catalase (CAT) enzyme activity did not change in this experimental model. Surprisingly, we observed increased mitochondrial electron transfer chain (METC) activity. Caspase-3 and caspase-8 activities and TNF-a levels did not change in this experimental model. Finally, vitamin A supplementation did not induce depression in adult rats after 28 days of treatment. However, exploration in the center of an open field was decreased and time spent in freezing behavior was increased in vitamin A treated rats. (C) 2008 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available