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GEN reports on strategies to overcome blood-brain barrier
Date:2/5/2009

New Rochelle, NY, February 5, 2009The blood-brain barrier (BBB) remains a major obstacle to the successful delivery of drugs to treat central nervous system (CNS) disorders, reports Genetic Engineering and Biotechnology News (GEN). Researchers are exploring a variety of approaches to preserve the ability of the BBB to block harmful and toxic substances from entering the brain and to permit the passage of effective medicines for the treatment of CNS diseases, according to the February 1 issue of GEN (http://www.genengnews.com/articles/chitem.aspx?aid=2778).

"The blood-brain barrier issue probably serves as the most significant roadblock to the treatment of central nervous system diseases," says John Sterling, Editor in Chief of GEN. "The key challenge is to treat people suffering from CNS disorders while trying to stay true to the physician's oath, 'First do no harm'."

One technology for enabling active transport of small molecule drugs across the BBB involves targeting endogenous nutrient transporters. These transporters are members of the solute carrier (SLC) transporter superfamily. Transport of small molecules across the BBB by these membrane proteins is known as carrier-mediated transport (CMT).

In order to design drugs that utilize CMT to cross the BBB, researchers modify their chemical structures so that they resemble nutrients that are transported across the BBB by specific SLCs. The prototypical drug that uses this strategy (which was developed long before mechanisms of CMT were known) is L-DOPA, the major current drug for Parkinson's disease. L-DOPA is used to replace dopamine that is lost due to degeneration of dopaminergic neurons in the substantia nigra of the brain.

Another major system that is used in normal mammalian physiology to enable needed molecules to cross the BBB is receptor-mediated transport (RMT). The b
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Contact: John Sterling
jsterling@genengnews.com
914-740-2196
Mary Ann Liebert, Inc./Genetic Engineering News
Source:Eurekalert

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