Millions of people around the world live with chronic nerve pain, a condition that can make even simple everyday sensations feel painful.
For some people, a light touch, warm water, or gentle movement can trigger burning, tingling, or stabbing pain that lasts for months or even years.
Doctors have long struggled to find effective treatments for chronic nerve pain because many existing medications only reduce symptoms temporarily and often come with side effects such as drowsiness, dizziness, or addiction risk.
Now, researchers at Duke University School of Medicine say they may have discovered a completely new way to treat chronic pain by helping damaged nerve cells regain their energy supply.
The study, published in the journal Nature, focused on mitochondria, tiny structures inside cells that produce energy. Mitochondria are sometimes called the “powerhouses” of cells because they generate the energy cells need to survive and function properly.
Scientists have suspected for years that mitochondria may play a major role in chronic nerve pain. When nerves become damaged by conditions such as diabetes or chemotherapy, the mitochondria inside those nerve cells often stop working correctly.
Without enough energy, nerve cells can become inflamed, damaged, and overactive, sending pain signals to the brain even when there is no immediate injury.
The Duke research team wanted to see whether restoring healthy mitochondria could help damaged nerves recover.
The researchers used both mouse models and human tissue in their experiments. They focused on two major causes of chronic nerve pain: diabetic neuropathy and chemotherapy-related nerve damage.
Diabetic neuropathy is a common complication of diabetes that can damage nerves in the feet, hands, and legs. Chemotherapy drugs used to treat cancer can also injure nerves, causing numbness, tingling, weakness, and severe pain.
In the study, scientists found that replenishing healthy mitochondria significantly reduced pain symptoms. In some cases, the pain relief lasted for up to 48 hours.
Instead of simply blocking pain signals like many current pain medications do, the new approach appears to address one of the underlying causes of chronic nerve pain by restoring the energy supply inside damaged nerve cells.
Senior author Dr. Ru-Rong Ji from Duke University explained that helping nerves regain healthy mitochondria may reduce inflammation and support healing at the same time.
The researchers focused on special support cells called satellite glial cells. These cells surround sensory neurons, which are nerve cells responsible for carrying pain and touch information to the brain.
For many years, scientists believed satellite glial cells mainly provided structural support. However, the new study uncovered a much more active role.
The researchers found that satellite glial cells appear to transfer healthy mitochondria directly into damaged sensory neurons. They do this through extremely tiny bridge-like structures called tunneling nanotubes.
These nanotubes act almost like microscopic tunnels between cells, allowing mitochondria to move from one cell to another.
According to the researchers, this transfer system may help keep damaged nerves alive and functioning properly.
When the mitochondrial transfer process breaks down, nerve fibers begin to deteriorate. This can lead to chronic pain symptoms such as burning, tingling, numbness, and hypersensitivity, especially in the hands and feet where nerves extend the farthest from the spinal cord.
The scientists discovered that increasing mitochondrial transfer in mice reduced pain-related behaviors by as much as 50 percent.
The team also tested a more direct method. Researchers isolated healthy mitochondria from human and mouse cells and injected them into clusters of sensory nerve cells called dorsal root ganglia.
These clusters help carry sensory information from the body to the brain.
The quality of the mitochondria turned out to be extremely important. Healthy donor mitochondria reduced pain significantly, while mitochondria taken from people with diabetes produced little or no benefit.
The study also identified an important protein called MYO10. This protein appears necessary for forming the tunneling nanotubes that allow mitochondria to travel between cells.
Without MYO10, the transfer system became less effective.
The researchers say the findings reveal a previously overlooked communication system inside the nervous system. Instead of acting independently, nerve cells and glial support cells may constantly exchange energy resources to help maintain healthy nerve function.
Scientists believe this discovery could eventually lead to a completely new class of pain treatments.
Current chronic pain therapies often focus on suppressing nerve activity or blocking pain signals after they are already being produced. In contrast, mitochondrial therapy may help repair the underlying nerve damage itself.
The findings may also have implications beyond chronic pain. Researchers are increasingly studying mitochondrial transfer in conditions such as stroke, obesity, neurodegenerative disease, and cancer.
At the same time, the scientists caution that much more work is still needed before this approach could be used in patients. The current research mainly involved laboratory models and animal studies.
Future studies will need to confirm safety, determine the best delivery methods, and understand how long the effects may last in humans.
The researchers also want to use higher-resolution imaging techniques to better understand how the tunneling nanotubes function inside living tissue.
Looking carefully at the findings, the study appears highly promising because it addresses one of the possible root causes of chronic nerve pain rather than simply masking symptoms. The combination of human tissue experiments and animal studies strengthens the research considerably.
The discovery of mitochondrial transfer between support cells and nerve cells is also scientifically important because it reveals a new biological mechanism that was previously poorly understood. However, the research is still early, and many treatments that work in mice do not always succeed in humans.
Larger studies will be needed before this approach could become a real therapy. Even so, the findings offer exciting hope that future treatments for chronic nerve pain may focus on restoring nerve cell health and energy rather than only blocking pain signals.
If you care about pain, please read studies about vitamin K deficiency linked to hip fractures in old people, and these vitamins could help reduce bone fracture risk.
For more information about wellness, please see recent studies that Krill oil could improve muscle health in older people, and eating yogurt linked to lower frailty in older people.
Source: Duke University School of Medicine.
