Abstract
Antidepressant drugs as well as electroconvulsive stimuli can significantly influence brain concentrations of neurotrophic factors. However, it is not known whether the baseline brain concentrations of neurotrophic factors are altered in human subjects suffering from affective disorders or whether there are sex differences in concentrations of neurotrophins in human brain. In order to elucidate some of these questions, we measured by ELISA brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) in an animal model of depression, the Flinders Sensitive Line (FSL) rats and their controls, the Flinders Resistant Line (FRL). Altered BDNF and NGF concentrations were found in frontal cortex, occipital cortex, and hypothalamus of depressed FSL compared to FRL control rats. Furthermore, different levels of these neurotrophins were also found in the male and female brain. Cumulatively these observations suggest that BDNF and NGF may play a role in depression and, hypothetically, different brain regional concentrations of BDNF and NGF in male and female animals may be relevant to gender differences in vulnerability to depression.
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