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Limiting the damage in stroke

hich activates NF-kB, can be controlled. The researchers are able to shut down the molecule at any time in neurons. "More common methods of shutting down a gene remove it from all tissues, for an animal's entire life," Pasparakis says. "You can't do that with NF-kB itself ?in other types of cells the signal has important functions which are necessary for the animal to survive. So to test our hypotheses about its role in neurons, we needed more precise control of the gene." In parallel, Bernd Baumann and Thomas Wirth at the University of Ulm had generated two additional mouse models, which allow the reversible repression or activation of IKK2 at any time in neurons.

"The unique advantage of this system is that we can specifically induce or block this signaling pathway at virtually any time and selectively in neurons," Wirth emphasizes. Putting all of this expertise together permitted the researchers to get a clear picture of IKK2's role after a stroke.

Mice with the hyperactive form of IKK2 in neurons and too much NF-kB signalling, they discovered, suffer even more damage than normal; far more cells die. But if the IKK2 signal is blocked, damaged cells stay alive and even seem to recover. The effects are long-term; neurons in the damaged tissues were still alive several days after the stroke.

Two factors make the study promising in the search for treatments for this deadly disease. First, shutting down the IKK2 signal had beneficial effects even when it was done a few hours after the stroke. That is important when thinking about possible human therapies; it usually takes time for a patient to reach the hospital. Secondly, the same effects could be achieved by blocking IKK2 activity with a small artificial molecule. That's what a drug will have to do. Human cells have a very similar NF-kB signaling network, which means that there is a good chance IKK2 will do something similar in our own brain cells. As NF-kB passes a variety of other importa
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Source:European Molecular Biology Laboratory


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