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How Zebra Finches Learn Songs: Cellular Killer Also Important To Memory

Date:
December 28, 2006
Source:
University of Illinois at Urbana-Champaign
Summary:
A protein that triggers apoptosis also plays a part in memory formation. Graham R. Huesmann, a lead researcher on the study at the University of Illinois at Urbana-Champaign, had an intuition that growth and memory are linked. "You can't have growth without death," said David F. Clayton, a co-author of the study.

David F. Clayton, left, and Graham R. Huesmann have studied how zebra finches learn songs, which could have implications for the treatment of neurodegenerative conditions such as dementia and Alzheimer's disease.
Credit: Photo by L. Brian Stauffer

A protein known primarily for its role in killing cells also plays a part in memory formation, researchers at the University of Illinois at Urbana-Champaign report. Their work exploring how zebra finches learn songs could have implications for treatment of neurodegenerative conditions such as dementia and Alzheimer's disease.

When activated, the enzyme caspase-3 triggers a synaptic process essential for memory storage, according to Graham R. Huesmann and David F. Clayton of the department of cell and developmental biology and of the U. of I. Beckman Institute for Advanced Science and Technology. Their article, which appears in the Dec. 21 issue of the journal Neuron, describes their findings, which provide "the first direct evidence of a change in the availability of activated caspase-3 protein in the brain during the process of memory formation."

Caspase-3 is best known for its role in a biochemical cascade that leads to apoptotic cell death. These new findings demonstrate that the enzyme acts differently under different conditions, and suggest that its regulation in the brain is more complex than previously thought. Huesmann and Clayton examined the brains of zebra finches after exposing the birds to tape recordings of the songs of other birds. They found an increase in the concentration of activated caspase-3 in post-synaptic sites of the auditory forebrain shortly after the birds were exposed to unfamiliar bird songs. Exposure to familiar songs caused no significant increase in the enzyme.

The researchers demonstrated that the activated form of caspase-3 is short-lived and highly localized, which may explain why the enzyme does not trigger apoptosis.

They also showed that activated caspase-3 is always present in brain cells, but that it is usually bound by an inhibitor, BIRC4. For a short time after the birds are exposed to novel songs, the inhibitor releases the activated caspase-3. The concentration of unbound, activated caspase-3 peaks about 10 minutes after the birds hear the new songs.

Other research has added to the evidence that caspase-3 is essential to memory formation. Caspase-3 inhibitors injected into rat brains interfere with the animals' spatial memory and active avoidance learning.

Caspase-3's dual role as a cell killer and memory builder has long intrigued Huesmann, the lead author of the study. "Is it Memory or Is It Death? Caspase-3 and Memory Formation," was his dissertation title. Huesmann has a doctorate in neuroscience and is completing a medical degree at Illinois.

"Graham had this intuition that growth and memory is really a kind of remodeling," said Clayton, who is a professor of cell and structural biology. "You can't have growth without death."


Story Source:

The above story is based on materials provided by University of Illinois at Urbana-Champaign. Note: Materials may be edited for content and length.


Cite This Page:

University of Illinois at Urbana-Champaign. "How Zebra Finches Learn Songs: Cellular Killer Also Important To Memory." ScienceDaily. ScienceDaily, 28 December 2006. <www.sciencedaily.com/releases/2006/12/061222092644.htm>.
University of Illinois at Urbana-Champaign. (2006, December 28). How Zebra Finches Learn Songs: Cellular Killer Also Important To Memory. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2006/12/061222092644.htm
University of Illinois at Urbana-Champaign. "How Zebra Finches Learn Songs: Cellular Killer Also Important To Memory." ScienceDaily. www.sciencedaily.com/releases/2006/12/061222092644.htm (accessed October 23, 2014).

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