Osteoarthritis: Epilepsy drug may help minimize joint damage, pain

Evan Walker
Evan Walker TheMediTary.Com |
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An existing epilepsy drug may have the potential to be used as a treatment for osteoarthritis. peepo/Getty Images
  • Osteoarthritis is a painful and chronic condition that makes performing specific movements harder and more painful.
  • Managing osteoarthritis can be a struggle, so researchers have been trying to find medications that can help.
  • A recent study found that a particular sodium channel in neurons and cartilage cells may be a pivotal area to target, leading to reduced pain and joint damage from osteoarthritis.
  • This sodium channel may be successfully inhibited by the drug Carbamazepine, a medication that helps treat epilepsy.

Even with the renovations of modern medicine, certain chronic conditions, like osteoarthritis, remain difficult to manage. Research areas include finding ways to halt joint damage and improve pain symptoms.

A study published in Natureexamined how targeting the sodium channel Nav1.7 could help treat osteoarthritis. Using mouse models and cell analysis, researchers determined that this sodium channel is present in neurons and cartilage cells and that inhibiting it may be the key to osteoarthritis treatment.

The researchers further found that blocking the action of these sodium channels with the medication Carbamazepine can help minimize damage to joints and improve pain in osteoarthritis. This medication typically treats epilepsy, but this research demonstrates its potential to be used to treat other chronic conditions.

While this research is preliminary, it points to potential treatment options for osteoarthritis.

The current study focused on a way to slow the joint damage caused by osteoarthritis rather than focusing on pain relief alone. Researchers noted that osteoarthritis involves cartilage breakdown and pain. At the cellular level, this involves chondrocytes, or cartilage cells and neurons, which are involved in the pain response from osteoarthritis.

Researchers were particularly interested in understanding the presence and work of voltage-gated sodium channels in the cartilage cells. These sodium channels are a specific type of protein found in cell types.

To start, researchers examined chondrocytes in people with osteoarthritis. They found that the Nav1.7 sodium channels are present in chondrocytes and that the amount is increased in osteoarthritis.

Using mouse models, researchers genetically deleted Nav1.7 and studied the results. They found that in dorsal root ganglia neurons, the junction boxes for nerves as they exit the spinal column, this deletion contributed to pain reduction. In the chondrocyte cells in mice, the deletion contributed to much less structural damage and progression of osteoarthritis and less pain-related behavior from the osteoarthritis.

The results concluded that inhibiting these channels could be the key to slowing osteoarthritis progression and minimizing pain. Researchers looked at several components to test this hypothesis and some of the underlying mechanisms involved.

Dr. Yoon noted the following:

“The study investigating Nav1.7 is important to create disease modifying medicines for osteoarthritis. Understanding the cellular mechanisms underlying osteoarthritis and creating targeted therapies to address both pain and the actual disease itself will be necessary to modify the impact of this disease.”

Osteoarthritis is a common subtype of arthritis. When people have osteoarthritis, there is breakdown and damage in the joints, leading to pain, swelling, and movement struggles. Osteoarthritis affects various joints and can range in severity.

Study author Dr. Liu said there were challenges with treating osteoarthritis.

“Osteoarthritis, the most common form of arthritis, affects over [7.6%] of the global population and is a leading cause of disability. Unfortunately, there’s currently no cure, and existing treatments mainly focus on relieving pain without addressing the underlying cartilage breakdown. Patients often resort to invasive surgeries like total knee or hip replacements,” he told Medical News Today.

There are certain things people can do that may help to minimize their risk of developing osteoarthritis, such as maintaining a Healthy body weight and exercising regularly.

Management of osteoarthritis involves a number of strategies, often to help with symptom relief. There is growing evidence of the effectiveness of a range of exercises for knee osteoarthritis, including aerobic exercise, strength training, and balance training. A range of medications can relieve pain, and people may also try injections of corticosteroids or hot and cold therapy. However, it can be difficult to find effective strategies that prevent disease progression.

Dr. Steve Yoon, a board certified physiatrist and director of The Regenerative Sports and Joint Clinic at Cedars-Sinai Kerlan-Jobe Institute in Los Angeles, who was not involved in the study, explained that common treatments for osteoarthritis “require a multidisciplinary approach.”

Managing osteoarthritis

“Modalities such as ice and heat can be used topically. Topical creams and ointments used may include anesthetic and anti-inflammatory medications as well as cannabidiol (CBD). Oral medications including acetaminophen and ibuprofen may be used for more serious pain control. Physical therapy will include a strength and low impact exercise program.”
— Dr. Steve Yoon

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