Public Release: 

Memory decline after head injury may be prevented by slowing brain cell growth

Rutgers study questions traditional scientific view that neurogenesis aids recovery

Rutgers University

The excessive burst of new brain cells after a traumatic head injury that scientists have traditionally believed helped in recovery could instead lead to epileptic seizures and long-term cognitive decline, according to a new Rutgers New Jersey Medical School study.

In the September issue of Stem Cell Reports, Viji Santhakumar, associate professor in the department of Pharmacology, Physiology and Neuroscience, and her colleagues, challenge the prevailing assumption by scientists in the field that excessive neurogenesis (the birth of new brain cells) after injury is advantageous.

"There is an initial increase in birth of new neurons after a brain injury but within weeks, there is a dramatic decrease in the normal rate at which neurons are born, depleting brain cells that under normal circumstances should be there to replace damaged cells and repair the brain's network," said Santhakumar. "The excess new neurons lead to epileptic seizures and could contribute to cognitive decline"





"That's why we believe that limiting this process might be beneficial to stopping seizures after brain injury," she said.

While the regenerative capability of brain cells, in the hippocampus - the part of the brain responsible for learning and memory - slows down as part of the aging process, the Rutgers scientists determined that the process that occurred after a head injury was related to injury and not age.

"It is normal for the birth of new neurons to decline as we age," said Santhakumar. "But what we found in our study was that after a head injury the decline seems to be more rapid."


The Rutgers study was funded by the NJ Commission on Brain Injury Research. An estimated 12,000 to 15,000 New Jersey residents suffer brain injuries annually.
