Alzheimer’s disease affects millions of people around the world and is one of the leading causes of memory loss in older adults.
It gradually damages brain cells, leading to problems with thinking, behavior, and daily life. Families often see this as a slow and painful process, and scientists have spent many years trying to find better ways to stop or slow the disease.
A new study from Johns Hopkins Medicine, published in the Proceedings of the National Academy of Sciences, points to an unexpected possibility.
The research focuses on a natural gas produced inside the body called hydrogen sulfide. Most people know this gas because it smells like rotten eggs, but inside the body it may have an important protective role when it is present in tiny amounts.
The production of this gas is controlled by a protein called CSE, short for Cystathionine gamma-lyase. Scientists wanted to understand what happens when this protein is missing. If CSE turns out to be essential for brain health, it could become a new target for drugs designed to protect memory.
To study this, researchers used mice that were genetically modified so they could not produce CSE. This gave the team a way to track how the loss of the protein affects the brain over time. It also helped them separate the role of CSE itself from other genetic changes that are often used in Alzheimer’s models.
At first, the mice seemed normal. When they were young, they performed about as well as normal mice on basic learning tasks. But as they aged, their memory began to decline. This gradual change is important because Alzheimer’s disease is also progressive. It usually starts quietly and becomes more severe over time.
In one of the main tests, the mice had to remember how to find a hidden escape route. Younger mice without CSE could still do the task, but older mice struggled much more. This suggested that the absence of the protein was harming the parts of the brain that support memory.
The researchers then looked deeper into the animals’ brains. They found increased oxidative stress, which means cells were under harmful chemical pressure. They also saw DNA damage and problems with the blood-brain barrier.
The blood-brain barrier is a protective shield that helps keep harmful substances out of the brain. When it becomes weak, the brain can be more easily damaged.
The study also found problems in the hippocampus, a region that is essential for learning and memory. In healthy brains, new neurons continue to form and move into this area.
In the mice lacking CSE, proteins linked to neuron formation were reduced, and the movement of newly formed neurons was disrupted. This means the brain may have lost part of its natural ability to repair and support memory.
These findings matter because earlier work had already suggested that tiny amounts of hydrogen sulfide might help protect brain cells. The new study strengthens that idea by showing what happens when the system that produces the gas breaks down. Without CSE, several features that resemble Alzheimer’s disease begin to appear.
At the same time, the researchers are careful not to overstate the result. Hydrogen sulfide cannot simply be given directly in large amounts because it is toxic at higher levels. The goal is not to add a dangerous gas to the brain, but to learn how to safely support the body’s natural process for making the very small amounts that may be helpful.
From a study-design point of view, this work is valuable because it combines memory testing with detailed biological analysis. It does more than show that memory worsens. It also explains possible reasons, including cell stress, weak brain protection, and reduced neuron growth.
Still, this is early-stage research. The work was carried out in mice, and there is no proof yet that boosting CSE will help people with Alzheimer’s disease. Human studies will be needed before this idea can move toward treatment.
Even so, the study opens a new line of thinking. It suggests that Alzheimer’s treatment may not only involve removing damage, but also strengthening the brain’s own protective chemistry. If future studies confirm these results, CSE could become an important new target in the search for better therapies.
If you care about Alzheimer’s, please read studies about the likely cause of Alzheimer’s disease , and new non-drug treatment that could help prevent Alzheimer’s.
For more health information, please see recent studies about diet that may help prevent Alzheimer’s, and results showing some dementia cases could be prevented by changing these 12 things.
Source: Johns Hopkins Medicine.
