A new study has revealed that a breakdown in communication between key structures inside brain cells can disrupt their ability to produce energy, pointing to a potential new target for treating motor neuron disease (MND).
In amyotrophic lateral sclerosis (ALS), the most common form of MND, the nerve cells that control movement gradually stop functioning and die. Although scientists know that multiple cellular processes contribute to this degeneration, they are still uncovering the precise mechanisms involved.
Understanding how cells lose power
In this latest research, scientists at Columbia University Irving Medical Center in New York identified how a fault in the interaction between two essential cell structures, the mitochondria (which generate energy) and the endoplasmic reticulum (which helps build proteins), can impair energy use in nerve cells affected by ALS.
When these two structures fail to coordinate effectively, the cell switches from using sugar, its preferred energy source, to using fat. This shift is inefficient and harmful, leading to the production of toxic byproducts that further damage the cell.
The researchers focused on a critical cellular junction known as the mitochondria-associated ER membrane (MAM). This structure enables the mitochondria and endoplasmic reticulum to work together and manage the cell’s energy and protein needs.
By studying human-derived nerve cells and mouse models, the team found that this MAM connection doesn’t function properly in ALS. As a result, energy production breaks down and the cells release more reactive oxygen species, which are molecules that can damage or destroy healthy cells.
The mitochondria’s central role
The team also discovered that a specific enzyme complex in the mitochondria, called complex I, functions abnormally in ALS. This malfunction compounds the energy problem, making it even harder for the cells to survive.
These findings offer new insight into why nerve cells die in ALS. Rather than simply running out of energy, they appear to switch to an alternative energy source that actively harms them.
By highlighting the MAM’s role in this process, the study opens up a potential new avenue for treatment. If researchers can find ways to restore this vital connection, they may be able to correct the energy imbalance and protect nerve cells for longer. While these findings are still in the early stages, they add another piece to the complex puzzle of ALS and offer a promising direction for future therapies.
This research also adds to our growing understanding of the faulty mechanisms that drive ALS and shows why uncovering these details is so vital to developing effective treatments.
This research snapshot was created using the University of Sheffield’s Readable Research series, which helps turn technical science into clear, meaningful updates.
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