Bone marrow mesenchymal stem cells repair spinal cord ischemia/reperfusion injury by promoting axonal growth and anti-autophagy.
Bone marrow mesenchymal stem cells can differentiate into neurons and astrocytes after transplantation in the spinal cord of rats with ischemia/reperfusion injury. Although bone marrow mesenchymal stem cells are known to protect against spinal cord ischemia/reperfusion injury through anti-apoptotic effects, the precise mechanisms remain unclear. In the present study, bone marrow mesenchymal stem cells were cultured and proliferated, then transplanted into rats with ischemia/reperfusion injury via retro-orbital injection. Immunohistochemistry and immunofluorescence with subsequent quantification revealed that the expression of the axonal regeneration marker, growth associated protein-43, and the neuronal marker, microtubule-associated protein 2, significantly increased in rats with bone marrow mesenchymal stem cell transplantation compared with those in rats with spinal cord ischemia/reperfusion injury. Furthermore, the expression of the autophagy marker, microtubule-associated protein light chain 3B, and Beclin 1, was significantly reduced in rats with the bone marrow mesenchymal stem cell transplantation compared with those in rats with spinal cord ischemia/reperfusion injury. Western blot analysis showed that the expression of growth associated protein-43 and neurofilament-H increased but light chain 3B and Beclin 1 decreased in rats with the bone marrow mesenchymal stem cell transplantation. Our results therefore suggest that bone marrow mesenchymal stem cell transplantation promotes neurite growth and regeneration and prevents autophagy. These responses may likely be mechanisms underlying the protective effect of bone marrow mesenchymal stem cells against spinal cord ischemia/reperfusion injury.
Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun, Jilin Province, China.
Fei
F
Yin
Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun, Jilin Province, China.
Chunyang
C
Meng
Department of Toxicology, School of Public Health, Jilin University, Changchun, Jilin Province, China.
Rifeng
R
Lu
Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun, Jilin Province, China.
Lei
L
Li
Department of Toxicology, School of Public Health, Jilin University, Changchun, Jilin Province, China.
Ying
Y
Zhang
Department of Orthopedics, China-Japan Union Hospital, Jilin University, Changchun, Jilin Province, China.
Hao
H
Chen
Department of Toxicology, School of Public Health, Jilin University, Changchun, Jilin Province, China.
Yonggang
Y
Qin
Department of Toxicology, School of Public Health, Jilin University, Changchun, Jilin Province, China.
Li
L
Guo
NSFC grant; autophagy; axonal growth; bone marrow mesenchymal stem cells; nerve regeneration; neural regeneration; repair; spinal cord ischemia/reperfusion injury