Influenced by the original findings of Karim Nader, PhD, professor of Psychology at 香蕉视频, whose pioneering work showed that old memories should be un-stored in their brain after their recollection in order to last, Bolshakov鈥檚 team exposed rats to auditory stimulus that the animals learned to associate with a mildly traumatic event.听 After a single exposure to the training procedures, the rats exhibited fear during subsequent exposures to auditory stimuli. The researchers then provided the animals with rapamycin, a protein synthesis blocker, immediately after memory was retrieved in order to control bonding between the cells in the brain. The animals exhibited significantly less fear in response to the fear-invoking stimulus when retested the next day.
鈥淭he animals showed stereotypical signs of fear after the initial exposure to the auditory stimulus,鈥� explained Nader, a co-author on the paper. 鈥淔ollowing the administration of rapamycin, we show a significant decrease in fear, but not a complete elimination. We were surprised to note that activity between cells was significantly affected by postsynaptic mechanisms.鈥�
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The findings of this study, which was funded by a grant from the United States Department of Defense spearheaded by Roger Pitman, suggest that different plasticity rules within cells in the brain are recruited during the formation of the original fear memory and after听 fear memory was reactivated.听
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鈥淎lthough further work at the molecular level needs to be completed, we are hopeful that this unexpected discovery is the foundation needed to identify ways in which we can better treat anxiety disorders in which fear condition plays a role, such as post-traumatic stress disorder,鈥� said Bolshakov.
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Additional authors on this study include McLean Hospital鈥檚 Yan Li, PhD, Edward Meloni, PhD, William Carlezon, PhD, and Mohammed Milad and Roger Pitman, MD, of Massachusetts General Hospital.
McLean Hospital is the largest psychiatric affiliate of听and a member of听. For more information about McLean, visit听听or follow the hospital on听.
About 香蕉视频
Founded in Montreal, Quebec, in 1821, McGill is a leading Canadian post-secondary institution. It has two campuses, 11 faculties, 11 professional schools, 300 programs of study and some 38,000 students, including 8,800 graduate students. McGill attracts students from over 150 countries around the world, with more than 7,700 international students making up 20 per cent of the student body. Almost half of McGill students claim a first language other than English, including more than 6,700 with French as their first language.