Japanese Scientists Achieve Breakthrough in Spinal Cord Injury Treatment Using iPS Stem Cells
In Japan, researchers have made a significant step forward in treating spinal cord injuries using stem cell therapy — and the initial results are promising. Two out of four patients who participated in the clinical trial experienced improvements in motor function after receiving stem cell implants.
Currently, there are few effective treatment options for patients suffering from paralysis caused by spinal cord injuries. In Japan alone, over 150,000 individuals are affected, with approximately 5,000 new cases each year. This reality prompted a team from Keio University in Tokyo to launch a groundbreaking study in the field of neuroregenerative medicine.
The research involved the use of induced pluripotent stem cells (iPS), which are created by reprogramming adult cells back into a stem cell–like state. These were then developed into neural precursor cells, capable of differentiating into nerve tissue. Each patient received an injection of over two million of these cells directly into the damaged area of the spinal cord.
After a full year of observation, researchers reported no serious complications or adverse effects. One patient reached level C on the ASIA (American Spinal Injury Association) scale, indicating some voluntary muscle movement in the limbs. Another participant made even greater progress, reaching level D, gaining the ability to stand independently, and is currently learning to walk.
The procedures were performed during a critical window — 14 to 28 days after the injury — when the body is most receptive to regeneration. All participants received immunosuppressive therapy for six months post-surgery to prevent rejection of the implanted cells.
Originally approved by the Japanese government in 2019, this study represents a major milestone in regenerative medicine. Researchers are continuing to monitor patient progress and are planning further clinical trials to better understand the long-term impact of the treatment.
