MUMBAI: Exposure to chronic stress in early life could bring out anxiety and aggression in later life, believe scientists from the New York-based Cold Spring Harbor Laboratory.
Researchers from Cold Spring Harbor Laboratory have just published a study in the PLoS One journal to show that young mice who were exposed to chronic stress exhibited aggressive behavior on growing up.
The research team led by Dr Grigori Enikolopov assessed the impacts of social stress upon adolescent mice, both at the time they are experienced and during adulthood. A press release sent by Cold Spring Harbor Laboratory showed, The tests began with 1-month-old male mice — the equivalent, in human terms of adolescents — each placed for 2 weeks in a cage shared with an aggressive adult male. The animals were separated by a transparent perforated partition, but the young males were exposed daily to short attacks by the adult males.'' This chronic activity produced social-defeat stress in the young mice.
The young mice with chronic social defeat had high levels of anxiety helplessness, diminished social interaction, and diminished ability to communicate with other young animals.
Another group of young mice was also exposed to social stress, but was then placed for several weeks in an unstressful environment. In this second, now-adult group, most of the behaviors impacted by social defeat returned to normal. "This shows that young mice, exposed to adult aggressors, were largely resilient biologically and behaviorally," said Dr Enikolopov.
However, in these resilient mice, the team measured two latent impacts on behavior. As adults they were abnormally anxious, and were observed to be more aggressive in their social interactions.
"The exposure to a hostile environment during their adolescence had profound consequences in terms of emotional state and the ability to interact with peers," the release quoted Dr Enikolopov as saying.
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