Journal of Korean Neurosurgical Society

The Korean Neurosurgical Society (대한신경외과학회)
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Current Status and Future Strategies to Treat Spinal Cord Injury with Adult Stem Cells

  • Jeong, Seong Kyun (Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine) ;
  • Choi, Il (Department of Neurological Surgery, Hallym University Dongtan Sacred Heart Hospital) ;
  • Jeon, Sang Ryong (Department of Neurological Surgery, Asan Medical Center, University of Ulsan College of Medicine)
  • Received : 2019.06.23
  • Accepted : 2019.09.17
  • Published : 2020.03.01
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Abstract

Spinal cord injury (SCI) is one of the most devastating conditions and many SCI patients suffer neurological sequelae. Stem cell therapies are expected to be beneficial for many patients with central nervous system injuries, including SCI. Adult stem cells (ASCs) are not associated with the risks which embryonic stem cells have such as malignant transformation, or ethical problems, and can be obtained relatively easily. Consequently, many researchers are currently studying the effects of ASCs in clinical trials. The environment of transplanted cells applied in the injured spinal cord differs between the phases of SCI; therefore, many researchers have investigated these phases to determine the optimal time window for stem cell therapy in animals. In addition, the results of clinical trials should be evaluated according to the phase in which stem cells are transplanted. In general, the subacute phase is considered to be optimal for stem cell transplantation. Among various candidates of transplantable ASCs, mesenchymal stem cells (MSCs) are most widely studied due to their clinical safety. MSCs are also less immunogenic than neural stem/progenitor cells and consequently immunosuppressants are rarely required. Attempts have been made to enhance the effects of stem cells using scaffolds, trophic factors, cytokines, and other drugs in animal and/or human clinical studies. Over the past decade, several clinical trials have suggested that transplantation of MSCs into the injured spinal cord elicits therapeutic effects on SCI and is safe; however, the clinical effects are limited at present. Therefore, new therapeutic agents, such as genetically enhanced stem cells which effectively secrete neurotrophic factors or cytokines, must be developed based on the safety of pure MSCs.

Keywords

References

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