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New development in relief of spasms related to amyotrophic lateral sclerosis

Date:
November 6, 2012
Source:
INSERM (Institut national de la santé et de la recherche médicale)
Summary:
Scientists have recently discovered the origin of spasms - a disabling symptom of amyotrophic lateral sclerosis. The degeneration of serotonin-releasing neurons is responsible for these sensations. In the longer term, researchers imagine that molecules acting on serotonin receptors present in the brain could eliminate spasticity in patients.

A team of researchers from Strasbourg, directed by Luc Dupuis (Inserm unit 692 "molecular signalling and neurodegeneration"), has recently discovered the origin of spasms -- a disabling symptom of amyotrophic lateral sclerosis. The degeneration of serotonin-releasing neurons is responsible for these sensations. In the longer term, researchers imagine that molecules acting on serotonin receptors present in the brain could eliminate spasticity in patients.

Their results are published in the journal Brain.

Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease with an occurrence rate in France similar to multiple sclerosis (two to three new cases per year for every 100,000 residents). It has a specific affect on neurons responsible for motor control, in particular motor neurons and central motor neurons. The former, located in the spinal cord, are directly linked to muscles and are used for muscle contraction and stretching. The latter, located in the brain, receive movement orders. As the disease develops, the neurons degenerate and the muscles are no longer stimulated and stop working. Movements, walking and speech become increasingly difficult and patients tend to pass away an average of two to five years after diagnosis, generally due to respiratory failure.

Paralysis is accompanied by other symptoms, which can be highly disabling on a daily basis. Spasms (or spasticity) are an exaggerated muscular response to a stimulus; they produce long and involuntary muscle contractions, coupled with pain. Spasticity is frequently observed in ALS. Until now, it was attributed to the loss of central motor neurons.

In this study, Inserm researchers have shown that these spasms are, in fact, linked to the degeneration of another type of serotonin-producing neurons located on the brain.

They have observed -- both in patients with ALS and in a transgenic mouse model -- that serotonergic neurons waste away as the disease develops and that serotonin levels in the spinal cord sharply decreased before the motor-related symptoms appeared.

Furthermore, some molecules active against serotonin receptors eliminate spasms in transgenic mice suffering from ALS. This research demonstrates that neuron degeneration in ALS is not limited to the motor system in its strictest sense. For Luc Dupuis "molecules acting on serotonin receptors 5-HT2B and C could be antispastic for ALS patients over the long-term."


Story Source:

The above story is based on materials provided by INSERM (Institut national de la santé et de la recherche médicale). Note: Materials may be edited for content and length.


Journal Reference:

  1. C. Dentel, L. Palamiuc, A. Henriques, B. Lannes, O. Spreux-Varoquaux, L. Gutknecht, F. Rene, A. Echaniz-Laguna, J.-L. Gonzalez de Aguilar, K. P. Lesch, V. Meininger, J.-P. Loeffler, L. Dupuis. Degeneration of serotonergic neurons in amyotrophic lateral sclerosis: a link to spasticity. Brain, 2012; DOI: 10.1093/brain/aws274

Cite This Page:

INSERM (Institut national de la santé et de la recherche médicale). "New development in relief of spasms related to amyotrophic lateral sclerosis." ScienceDaily. ScienceDaily, 6 November 2012. <www.sciencedaily.com/releases/2012/11/121106102050.htm>.
INSERM (Institut national de la santé et de la recherche médicale). (2012, November 6). New development in relief of spasms related to amyotrophic lateral sclerosis. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2012/11/121106102050.htm
INSERM (Institut national de la santé et de la recherche médicale). "New development in relief of spasms related to amyotrophic lateral sclerosis." ScienceDaily. www.sciencedaily.com/releases/2012/11/121106102050.htm (accessed July 24, 2014).

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