Wednesday, June 27, 2007
In a host of neurological diseases, including multiple sclerosis (MS) and several neuropathies, the protective covering surrounding the nerves is damaged. Scientists at the Weizmann Institute of Science have discovered an important new line of communication between nervous system cells that is crucial to the development of myelinated nerves – a discovery that may aid in restoring the normal function of the affected nerve fibres.
Weizmann Institute scientists Prof. Elior Peles, graduate student Ivo Spiegel, and their colleagues in the Molecular Cell Biology Department and in the United States, have provided a vital insight into the mechanism by which glial cells recognize and myelinate axons.
The Weizmann Institute team found a pair of proteins that pass messages from axons to glial cells. These proteins, called Necl1 and Necl4, belong to a larger family of cell adhesion molecules.
Peles and his team discovered that even when removed from their cells, Necl1, normally found on the axon surface, and Necl4, which is found on the glial cell membrane, adhere tightly together. When these molecules are in their natural places, they not only create physical contact between axon and glial cell, but also serve to transfer signals to the cell interior, initiating changes needed to undertake myelination.
The scientists found that production of Necl4 in the glial cells rises when they come into close contact with an unmyelinated axon, and as the process of myelination begins. They observed that if Necl4 is absent in the glial cells, or if they blocked the attachment of Necl4 to Necl1, the axons that were contacted by glial cells did not myelinate. In the same time period, myelin wrapping was already well underway around most of the axons in the control group.
“What we’ve discovered is a completely new means of communication between these nervous system cells,” says Peles. “The drugs now used to treat MS and other degenerative diseases in which myelin is affected can only slow the disease, but not stop or cure it. Today, we can’t reverse the nerve damage caused by these disorders. But if we can understand the mechanisms that control the process of wrapping the axons by their protective sheath, we might be able to recreate that process in patients.”
Contact: Weizmann Institute of Science