A new way to study the role of a critical neurotransmitter in disorders such as epilepsy, anxiety, insomnia, depression, schizophrenia, and alcohol addiction has been developed by a group of scientists led by Gong Chen, an associate professor of biology at Penn State University. The new method involves molecularly engineering a model synapse -- a structure through which a nerve cell send signals to another cell. This model synapse can precisely control a variety of receptors for the neurotransmitter called GABA, which is important in brain chemistry. The research, which will be published in the Journal of Biological Chemistry on 10 August 2012, opens the door to the possibility of creating safer and more-efficient drugs that target GABA receptors and that cause fewer side effects.
Neurotransmitters -- chemicals sent by nerves to trigger other cells to change their electrical responses -- interact with special receptors located on the cell's outer membrane. These receptors form inside the cell, and then are transported to different locations on the membrane to await the arrival of neurotransmitters. Chen explained that understanding how these receptors work and how they move to various locations on a cell's membrane is a critical step toward the development of new drugs targeting diseases that affect brain chemistry.
In their study, Chen and his team focused on a particular receptor -- called the GABA-A receptor-- that responds to the neurotransmitter GABA. "The GABA-A receptors are associated with various disorders in which nerve-cell excitability is altered, such as epilepsy and anxiety, and these receptors mediate major inhibition in the brain," Chen explained. "Each GABA-A receptor protein is made up of five subunits and there are 19 possible subunits that can combine in various ways to form any single receptor. We focused on a particular group of subunits called Alpha, and how changing these tiny subunits might affect the GABA
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