Scientists invented a pocket-sized model of the most common form of amyotrophic lateral sclerosis (ALS). The "disease-on-a-chip," made using stem cells, could pave the way for new treatments for the progressive condition, the researchers say.
In ALS, the brain and spinal-cord cells that control voluntary muscle movements — known as motor neurons — break down and die. As a result, the brain can no longer send signals to the muscles, leading to symptoms of muscle weakness and paralysis, as well as trouble speaking, swallowing and breathing.
