Abstract：
BACKGROUND:Psychiatric illness and anxiety disorders have strong neurodevelopmental components. Environmental insults such as prenatal exposure to stress and genetic differences in stress responses may affect brain development. METHODS:A rat model of random variable prenatal stress was used to study the expression and processing of hippocampal brain-derived neurotrophic factor (BDNF) in the offspring of the stressed rat dams. To account for unknown genetic influences that may play a role in the outcome of this prenatal stress paradigm, three different rat strains with known differences in stress responsivity were studied: Fischer, Sprague-Dawley, and Lewis rats (n=132). RESULTS:Multiple disparities in mRNA expression levels of BDNF, and transcripts related to its processing and signaling were found in the three strains. Of the numerous splice variants transcribed from the BDNF gene, the transcript containing BDNF exon VI was most aberrant in the prenatally stressed animals. Protein levels of both uncleaved proBDNF and mature BDNF were also altered, as was intra-cellular signaling by phosphorylation of the neurotrophic tyrosine kinase receptor type 2 (NTRK2, TrkB) and mitogen-activated protein kinase (Erk 1/2). Changes were not only dependent on prenatal stress, but were also strain dependent, demonstrating the importance of genetic background. CONCLUSION:BDNF signaling provides both positive neurotrophic support for neurons and negative apoptotic effects, both of which may contribute to behavioral or neurochemical outcomes after prenatal exposure to stress. Differential processing of BDNF after prenatal stress in the three rat strains has implications for human subjects where genetic differences may protect or exacerbate the effects of an environmental stressor during fetal development.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Neeley EW,Berger R,Koenig JI,Leonard Sdoi
10.1016/j.neuroscience.2011.03.065subject
Has Abstractpub_date
2011-07-28 00:00:00pages
24-35eissn
0306-4522issn
1873-7544pii
S0306-4522(11)00373-3journal_volume
187pub_type
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