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Mechanism For Nerve Cell Repair Identified
Researchers at the Montreal Neurological Institute at McGill University have identified a key mechanism for the normal development of motor nerve cells (motor neurons) - cells that control muscles.
The identification of the mechanism is crucial to understanding and treatment of a range of conditions involving nerve cell loss or damage, from spinal cord injury to neurodegenerative diseases such as ALS, also known as Lou Gehrig"s disease.
Nerve cell regeneration is a complex process. Not only do nerve cells have to regenerate, but just as importantly, their specific and individual connections need to be regenerated also.
The study offers invaluable insight into these vital processes by understanding the mechanisms involved in normal development of selected types of spinal cord motor nerve cells.
Motor neurons are highly specialized. They have distinct characteristics and connect to specific muscle types in specific regions of the body.
“These highly targeted nerve cell-to-muscle connections are determined in part by specific patterns of gene expression during embryonic development. More specifically, certain genes are expressed which tell the neuron what its properties will be, where to settle and which particular muscle to connect with," said Dr. Stefano Stifani, neuroscientist at the Montreal Neurological Institute and lead author in the study.
When nerve cells develop they require characteristic patterns of gene expression in order to become motor neurons or another type of nerve cell called interneurons.
Researchers show that during development, motor nerve cells have to express certain genes that continually suppress interneuron developmental characteristics.
“We have identified a key factor, called Runx1, which controls the correct development of motor neurons in the upper part of the spinal cord. Runx1, a factor that controls gene expression, helps motor neurons to maintain their status by regulating the expression of specific genes. In doing so, it might also help motor neurons find their target muscles," Dr. Stifani said.
Understanding the normal development and the highly specialized nature of nerve cells has important implications for understanding diseased or damaged nerve cells.
For example, in ALS, the motor nerve cells that are involved in swallowing and controlling the tongue are often the first to degenerate.
According
to
researchers,
knowing
the
specific
patterns
of
gene
expression
of
different
motor
nerve
cells
might
help
explain
why
certain
motor
neurons
are
more
susceptible
to
degeneration
and
help
identify
new
targets
for
treatments.
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