Abstract：
:Young rats become immobile when exposed to a potentially infanticidal adult male rat. Male-induced immobility declines during the preweaning period, paralleling the decrease in infanticidal threat. To investigate the neural substrates underlying the developmental change in immobility, male-induced expression of the immediate-early gene c-fos was assessed on postnatal days 7, 14 and 21. A huddle of three young rats was exposed to an adult male behind a screen. As control, three littermates were put in the testing chamber but not exposed to the male. On day 7, male exposed and control pups were immobile most of the time and c-fos expression did not differ between conditions. On day 14, rats in the presence of the male stopped ongoing behaviors and became immobile. They had significantly higher c-fos expression in the paraventricular nucleus of the hypothalamus, the amygdala, the periaqueductal gray, and the locus ceruleus. On day 21, the male-exposed rats that were immobile had elevated c-fos expression in a similar pattern as on day 14, however, different nuclei of the amygdala were activated. In contrast, male-exposed 21-day-old rats that showed control levels of immobility did not have elevated c-fos expression in these areas. These results demonstrate that male exposure induced c-fos expression in brain areas of young rats in an age-specific pattern. Some of the activated brain areas seem to have contributed to immobility. Differential activation of neuronal populations may underlie developmental changes in defensive immobility during early ontogeny.
journal_name
Behav Brain Resjournal_title
Behavioural brain researchauthors
Wiedenmayer CP,Barr GAdoi
10.1016/s0166-4328(01)00260-1subject
Has Abstractpub_date
2001-11-29 00:00:00pages
147-57issue
1-2eissn
0166-4328issn
1872-7549pii
S0166432801002601journal_volume
126pub_type
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