Now, researchers at Cold Spring Harbor Laboratory have discovered that a molecule called nitric oxide (NO) is a pivotal, natural regulator of the birth of new neurons in the adult brain. The study, published in this week's issue of the Proceedings of the National Academy of Sciences, shows that blocking nitric oxide production stimulates neural stem cell proliferation and hence dramatically increases the number of neurons that are generated in the brains of adult rats.
Importantly, the new neurons that arise as a consequence of blocking nitric oxide production display properties of normal neurons, and they appear to contribute directly to the architecture of the adult brain. The study suggests that modulating nitric oxide levels might be an effective strategy for replacing neurons that are lost from the brain due to stroke or chronic neurodegenerative disorders such as Alzheimer's, Parkinson's, and Huntington's disease.
A copy of the study is available on request.