Squirrels inspire new stroke treatments

Washington: Hibernating ground squirrels have provided clues to new treatments for brain damage caused by stroke.

While the animals' brains experience dramatically reduced blood flow during hibernation, just like human patients after a certain type of stroke, the squirrels emerge from their extended naps suffering no ill effects.

Now, a team of NIH-funded scientists identified a potential drug that could grant the same resilience to the brains of ischemic stroke patients by mimicking the cellular changes that protect the brains of those animals.

"For decades scientists have been searching for an effective brain-protecting stroke therapy to no avail. If the compound identified in this study successfully reduces tissue death and improves recovery in further experiments, it could lead to new approaches for preserving brain cells after an ischemic stroke," said researcher Francesca Bosetti.

Currently, the only way to minimize stroke-induced cell death is to remove the clot as soon as possible. A treatment to help brain cells survive a stroke-induced lack of oxygen and glucose could dramatically improve patient outcomes, but no such neuroprotective agents for stroke patients exist.

Recently, researchers led by John Hallenbeck found that a cellular process called SUMOylation goes into overdrive in a certain species of ground squirrel during hibernation. Hallenbeck suspected this was how the animals' brains survived the reduced blood flow caused by hibernation, and subsequent experiments in cells and mice confirmed his suspicions.

SUMOylation occurs when an enzyme attaches a molecular tag called a Small Ubiquitin-like Modifier (SUMO) to a protein, altering its activity and location in the cell. Other enzymes called SUMO-specific proteases (SENPs) can then detach those tags, thereby decreasing SUMOylation.

Lead author Joshua Bernstock and his colleagues examined whether any of over 4,000 molecules from the NCATS small molecule collections could boost SUMOylation by blocking a SENP called SENP2, which would theoretically protect cells from a shortage of life-sustaining substances.

The researchers first used an automated process to examine whether the compounds prevented SENP2 from severing the connection between a tiny metal bead and an artificial SUMO protein created in the lab of Wei Yang, Ph.D., the study's other senior author and an associate professor at Duke University in Durham, NC. This system, along with computer modeling and further tests performed both in and outside of cells, whittled the thousands of candidate molecules down to eight that could bind to SENP2 in cells and were non-toxic. Two of those - ebselen and 6-thioguanine - were then found to both boost SUMOylation in rat cells and keep them alive in the absence of oxygen and glucose.

A final experiment showed that ebselen boosted SUMOylation in the brains of healthy mice more than a control injection. 6-thioguanine was not tested because it is a chemotherapy drug with side effects that make it unsuitable as a potential stroke treatment. The researchers now plan to test whether ebselen can protect the brains of animal models of stroke.

Because SUMOylation affects a variety of molecules, Bernstock believes his group's approach could inspire similar attempts to treat neurological conditions by targeting pathways with wide-ranging effects. He also hopes it will prompt others to look to natural models, as he and Hallenbeck did with the ground squirrel.

The study appears in The FASEB Journal.