STUDY: Ionis-HTTRx Injections Found to Be Effective at Treating Huntington’s Disease

Recent trial indicates new drug may slow mutated huntingtin gene’s creation of harmful protein involved with devastating genetic disorder Huntington’s.

For perhaps the first time, patients suffering from Huntington’s disease have cause for hope. A recent trial conducted by researchers at University College London (UCL) indicates that an experimental drug may significantly suppress a mutated gene related to Huntington’s devastating degenerative effects.

It is estimated that about 30,000 people in the United States and 8,500 people in the UK currently suffer from Huntington’s. The disease, which some patients describe as a mix of Alzheimer’s, Parkinson’s and ALS, is responsible for a dizzying array of symptoms. Patients first experience severe mood swings and depression, then face ever-worsening dementia and a gradual loss of motor control that ends in paralysis; the majority die about 10 to 20 years following its onset.

“Most of our patients know what’s in their future,” said Ed Wild, a scientist who helped conduct UCL’s trial.

The disorder typically surfaces when patients are in their 30s or 40s, at which point those with children may unwittingly have passed the genetic mutation on to the next generation. This mutation, known as the huntingtin gene, triggers the creation of toxic huntingtin protein, which builds up in the brain and leads to mass cell death responsible for patients’ physical and mental decay.

Ionis-HTTRx, the drug featured in UCL’s trial, functions by essentially silencing the mutated huntingtin gene. Typically, the gene instructs messenger molecules to infiltrate cells and produce the dangerous protein. However, the trial provided the first evidence to suggest this protein creation process could be stopped in its tracks.

Forty-six men and women in early stages of Huntington’s received this revolutionary treatment at the Leonard Wolfson Experimental Neurology Centre at the National Hospital for Neurology and Neurosurgery in London. Some participants received placebos, while others received an injection of the drug directly into their spines.

Initial results showed that, not only were patients who received the infusion able to tolerate the drug with no notable side effects but that their levels of huntingtin protein were significantly lower following treatment. This suggests that the drug successfully intercepted messenger molecules, preventing them from entering brain cells and crucially lowering huntingtin protein levels as a result.

Existing treatments for Huntington’s help manage symptoms but can’t prevent or reverse the disease’s progress, making these new results particularly powerful and unprecedented. While researchers caution that Ionis-HTTRx is not a cure, and note that this trial had too small a sample size and did not run for a long enough period to be deemed conclusive, many are hopeful that this treatment will make a huge impact in patients’ quality of life.

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