Elsevier

Neurobiology of Aging

Volume 12, Issue 4, July–August 1991, Pages 317-324
Neurobiology of Aging

Review
Brain aging and Alzheimer's disease, “Wear and tear” versus “Use it or lose it”

https://doi.org/10.1016/0197-4580(91)90008-8Get rights and content

Abstract

In organs other than the brain, cell activation seems to increase “wear and tear,” e.g., by increased free-radical formation, and so to cause an increased rate of aging. However, activation of nerve cells within the physiological range seems to lead to maintenance of neurons during aging and in Alzheimer's disease, possibly by preferentially stimulating the action of protective mechanisms such as DNA repair. This “use it or lose it” principle might explain why certain neurons degenerate in aging or Alzheimer's disease while others do not, and why recovery of various neuronal systems during aging has been obtained by restoration of the missing stimulus. Consequently, neuronal activation might provide a means of prolonging its optimal function for the full length of our natural life span.

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