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Drug commonly used to treat bipolar disorder dramatically increases lifespan in worms
Date:10/30/2007

Nematode worms treated with lithium show a 46 percent increase in lifespan, raising the tantalizing question of whether humans taking the mood affecting drug are also taking an anti-aging medication. Results of the Buck Institute study, led by faculty member Gordon J. Lithgow, PhD, are currently published online in the Journal of Biological Chemistry.

Lithium has been used to treat mood affective disorders, including bipolar disease for decades. While the drug has been shown to protect neurons, the underlying mechanism of its therapeutic action is not understood. In humans, lithiums therapeutic range is very limited and the drug has serious side effects. The research provides a novel genetic approach to understanding how lithium works and highlights the utility of using the nematode C. elegans as a research subject in the field of pharmacogenetics. Pharmocogenetics involves the study of genetic factors that influence an organisms reaction to a drug.

In the study, scientists discovered that longevity was increased in the worms when the lithium turned down the activity of a gene that modulates the basic structure of chromosomes.

Lithgow believes that lithium impacts many genes. Understanding the genetic impact of lithium may allow us to engineer a therapy that has the same lifespan extending benefits, said Lithgow. One of the larger questions is whether the lifespan extending benefits of the drug are directly related to the fact that lithium protects neurons. The process of normal aging in humans is intrinsically linked to the onset of neurodegenerative disease. However, the cellular changes and events due to aging that impact neurodegeneration are not yet understood said Lithgow. Studies involving compounds such as lithium could provide breakthroughs in the attempt to understand the biomedical link between aging and disease. Lithgow and his lab are now surveying tens of thousands of compounds for affects on aging.

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Contact: Kris Rebillot
krebillot@buckinstitute.org
415-209-2260
Buck Institute for Age Research
Source:Eurekalert

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