Stem cells improve blood vessel function following spinal cord injury

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SCI is a life-threatening condition with limited treatment options. It occurs in two phases. The primary phase takes place when the initial trauma causes mechanical injury to the spinal cord. The secondary injury comes in the hours after. As the body attempts to deal with what has happened, it releases a surge of chemicals causing inflammation, decreased spinal cord blood flow and cell death – which further exacerbates the injury. As the body cannot readily replace dying cells after spinal cord injury, neurological function becomes permanently impaired, resulting in in severe movement and sensory disabilities.

While studies in animals have shown that the transplantation of stem cells might aid spinal cord repair by, among other things, replacing dead neural cells, the current study focused on suppressing damaging inflammation and improving blood vessel function, which may reduce the extent of injury.

Central nervous system (CNS) pericytes (specialized cells surrounding the capillaries) have recently gained significant attention within the scientific community. In addition to being recognized as major players in neural tissue trauma, pericytes share a common origin and, potentially, a common function with traditionally defined mesenchymal stromal/stem cells (MSCs). Although these cells have been previously studied in the lab, their therapeutic application (in vivo) has not been evaluated.

“Our study demonstrates that these cells not only display a MSC phenotype in a dish, but also have similar immunomodulatory effects in animals after spinal cord injury that are more potent than those of non-central nervous system tissue-derived cells. Therefore, these cells are of interest for therapeutic use in acute spinal cord injury,” said lead investigator Michael Fehlings, M.D., Ph.D.

The Fehlings research team, based at the Krembil Research Institute in Toronto Western Hospital and the University at Toronto, conducted their study by injecting human CNS-derived stromal cells into rats with SCI, and compared the results to a control group treated with MSCs. The cells protected blood vessels in the injured area, among other positive outcomes.

“These early effects further translated into enhanced functional recovery and tissue sparing 10 weeks after SCI.” Dr. Fehlings added. “This work demonstrates a new therapeutic approach.”

“The ideal source of cells for treating spinal cord injury has been a controversial and open question,” said Anthony Atala, M.D., Editor-in-Chief of STEM CELLS Translational Medicine and director of the Wake Forest Institute for Regenerative Medicine. “These results, showing the positive effects of central nervous system pericytes, not previously investigated for spinal cord injury, are intriguing and suggest a potential new therapeutic use.”

The full article, “Early intravenous delivery of human brain stromal cells modulates systemic inflammation and leads to vasoprotection in traumatic spinal cord injury,” can be accessed at

About STEM CELLS Translational Medicine: STEM CELLS Translational Medicine (SCTM), published by AlphaMed Press, is a monthly peer-reviewed publication dedicated to significantly advancing the clinical utilization of stem cell molecular and cellular biology. By bridging stem cell research and clinical trials, SCTM will help move applications of these critical investigations closer to accepted best practices.

About AlphaMed Press: Established in 1983, AlphaMed Press with offices in Durham, NC, San Francisco, CA, and Belfast, Northern Ireland, publishes two other internationally renowned peer-reviewed journals: STEM CELLS® (, celebrating its 34th year, is the world’s first journal devoted to this fast paced field of research.  The Oncologist® (, also a monthly peer-reviewed publication, entering its 21st year, is devoted to community and hospital-based oncologists and physicians entrusted with cancer patient care. All three journals are premier periodicals with globally recognized editorial boards dedicated to advancing knowledge and education in their focused disciplines.


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