In people with amyotrophic lateral sclerosis (ALS), changes in neurons appear to activate immune cells. Lowering the inflammation could reduce the symptoms of the disease, according to a study led by Chantelle Sephton, a professor at Université Laval’s Faculty of Medicine.

ALS is caused by the loss of upper motor neurons, located in the brain, and lower motor neurons, which extend from the spinal cord to the muscles. Using a genetically modified mouse model, Chantelle Sephton and her team found that structural changes in the upper neurons occurred prior to disease symptoms.

The study suggests that these morphological changes send a signal to microglia and astrocytes, the immune cells of the central nervous system. When they arrive, their effect is protective, but if they stay too long, they become toxic to neurons. This leads to a reduction in synaptic connections between motor neurons in the brain and spinal cord, which in turn results in a reduction in synaptic connections with muscles. These changes lead to atrophy and loss of motor function.

Given this correlation between symptoms and immune response, the research team wondered whether it might be possible to restore synaptic connections by blocking inflammation. ” We tested a semi-synthetic drug based on Withaferin A, an extract of the Ashwagandha plant, which has been used for thousands of years in traditional Indian medicine,” explains CERVO Research Center affiliate Chantelle Sephton.

The drug blocks inflammation and allows motor neurons to return to a more normal state. “We have noticed that neurons regenerate in the absence of activated immune cells. The dendrites of motor neurons start to grow and make connections again, increasing the number of synapses between motor neurons and muscles,” reports the researcher.

This seems a promising way of improving ALS symptoms, whether the disease is familial or sporadic, since both types are associated with inflammation.

Other diseases where inflammation plays a role, such as Alzheimer’s, could benefit from this approach.

The study was published in the scientific journal Acta Neuropathologica Communications. The signatories are Mari Carmen Pelaez, Antoine Desmeules, Pauline Gelon, Bastien Glasson, Laetitia Marcadet, Alicia Rodgers, Daniel Phaneuf, Silvia Pozzi, Paul Dutchak, Jean-Pierre Julien and Chantelle Sephton.



Source link

Leave a Reply

Your email address will not be published. Required fields are marked *

Before you post, please prove you are sentient.

What is 3 times 5?

Explore More

Master copper regulator discovery may offer Alzheimer’s clues

Credit: Unsplash/CC0 Public Domain New therapeutic opportunities often emerge from research on simple organisms. For instance, the 2020 Nobel Prize in Chemistry awarded to Emmanuelle Charpentier, Ph.D., and Jennifer Doudna,

Discovery has potential to solve the billion-dollar global cost of poorly managed wound healing

Scientists have uncovered a key step in the wound healing process that becomes disabled in diseases like diabetes and ageing, contributing to a global healthcare cost of managing poorly healing

Just a moment…

Just a moment… Enable JavaScript and cookies to continue This request seems a bit unusual, so we need to confirm that you’re human. Please press and hold the button until