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    Breaking News

    Triterpenoid Antioxidants Show Promise as Parkinson’s Treatment

    ...

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    07.24.12
    A “new and powerful” class of antioxidants called synthetic triterpenoids have demonstrated the ability to block the development of Parkinson’s disease in an animal model that developed the disease in a handful of days, according to Dr. Bobby Thomas, neuroscientist at the Medical College of Georgia at Georgia Health Sciences University and corresponding author of the study in the journal Antioxidants & Redox Signaling.

    Dr. Thomas and his colleagues were able to block the death of dopamine-producing brain cells that occurs in Parkinson’s by using the drugs to bolster Nrf2, a natural antioxidant and inflammation fighter.

    Stressors from head trauma to insecticide exposure to simple aging increase oxidative stress and the body responds with inflammation, part of its natural repair process. “This creates an environment in your brain that is not conducive for normal function,” Dr. Thomas said. “You can see the signs of oxidative damage in the brain long before the neurons actually degenerate in Parkinson’s.”

    Nrf2, the master regulator of oxidative stress and inflammation, is – inexplicably – significantly decreased early in Parkinson’s. In fact, Nrf2 activity declines normally with age.

    “In Parkinson’s patients you can clearly see a significant overload of oxidative stress, which is why we chose this target,” Dr. Thomas said. “We used drugs to selectively activate Nrf2.”

    Researchers parsed a number of antioxidants already under study for a wide range of diseases from kidney failure to heart disease and diabetes, and found triterpenoids the most effective on Nrf2. Co-author Dr. Michael Sporn, Professor of Pharmacology, Toxicology and Medicine at Dartmouth Medical School, chemically modified the agents so they could permeate the protective blood-brain barrier.

    Both in human neuroblastoma and mouse brain cells they were able to document an increase in Nrf2 in response to the synthetic triterpenoids. Human dopaminergic cells are not available for research so the scientists used the human neuroblastoma cells, which are actually cancer cells that have some properties similar to neurons.

    Their preliminary evidence indicated the synthetic triterpenoids also increase Nrf2 activity in astrocytes, a brain cell type which nourishes neurons and hauls off some of their garbage. The drugs didn’t protect brain cells in an animal where the Nrf2 gene was deleted, more proof that that Nrf2 is the drugs’ target.

    The researchers used the powerful neurotoxin MPTP to mimic Parkinson’s-like brain cell damage in a matter of days. They are now looking at the impact of synthetic triterpenoids in an animal model genetically programmed to acquire the disease more slowly, as humans do. Collaborators at Johns Hopkins School of Medicine also will be providing induced pluripotent stem cells, adult stem cells that can be coaxed into forming dopaminergic neurons, for additional drug testing.

    Other collaborators include scientists at Weill Medical College of Cornell University, Johns Hopkins School of Public Health, Moscow State University, Tohoku University and the University of Pittsburgh.
     
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