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Protein-based coating could help rehabilitate long-term brain function
Date:7/31/2012

Brain-computer interfaces are at the cutting edge for treatment of neurological and psychological disorder, including Parkinson's, epilepsy, and depression. Among the most promising advance is deep brain stimulation (DBS) a method in which a silicon chip implanted under the skin ejects high frequency currents that are transferred to the brain through implanted electrodes that transmit and receive the signals. These technologies require a seamless interaction between the brain and the hardware.

But there's a catch. Identified as foreign bodies by the immune system, the brain attacks the electrodes and forms a barrier to the brain tissue, making it impossible for the electrodes to communicate with brain activity. So while the initial implantation can diminish symptoms, after a few short years or even months, the efficacy of this therapy begins to wane.

Now Aryeh Taub of Tel Aviv University's School of Psychological Sciences, along with Prof. Matti Mintz, Roni Hogri and Ari Magal of TAU's School of Psychological Sciences and Prof. Yosi Shacham-Diamand of TAU's School of Electrical Engineering, has developed a bioactive coating which not only "camouflages" the electrodes in the brain tissue, but actively suppresses the brain's immune response. By using a protein called an "interleukin (IL)-1 receptor antagonist" to coat the electrodes, the multi-disciplinary team of researchers has found a potential resolution to turn a method for short-term relief into a long-term solution. This development was reported in the Journal of Biomedical Materials Research.

Limiting the immune response

To overcome the creation of the barrier between the tissue and the electrode, the researchers sought to develop a method for placing the electrode in the brain tissue while hiding the electrode from the brain's immune defenses. Previous research groups have coated the electrodes with various proteins, says Taub, but the TAU team decided
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Contact: George Hunka
ghunka@aftau.org
212-742-9070
American Friends of Tel Aviv University
Source:Eurekalert

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