Objective:To determine if a cell cycle inhibitior, olomoucine, would decrease neuronal cell death, limit astroglial proliferation and production of inhibitory CSPGs, and eventually enhance the functional compensation ...Objective:To determine if a cell cycle inhibitior, olomoucine, would decrease neuronal cell death, limit astroglial proliferation and production of inhibitory CSPGs, and eventually enhance the functional compensation after SCI in rats. Methods: Three were used as un-operated controls and twelve as sham operated controls. Following spinal cord injury, 48 rats were randomly and blindly assigned to either olomoucine (n=24) or vehicle treatment (n=24) groups. Results: Up-regulations of cell cycle components were closely associated with neuronal cell death and astroglial proliferation as well as the production of CSPGs after SCI. Meanwhile, administration of olomoucine, a selective cell cycle kinase (CDK) inhibitor, has remarkably reduced the up-regulated cell cycle proteins and then decreased neuronal cell death, astroglial proliferation as well as accumulation of CSPGs. More importantly, the treatment with olomoucine has also increased expression of growth-associated proteins-43 (GAP-43), reduced the cavity formation, and improved functional deficits. Conclusion: Suppressing astroglial cell cycle in acute spinal cord injuries is beneficial to axonal growth. in turn, the future therapeutic strategies can be designed to achieve efficient axonal regeneration and functional compensation after traumatic CNS injury.展开更多
Background:Astrocytes become reactive following many types of CNS injuries.Excessive astrogliosis is detrimental and contributes to neuronal damage.We sought to determine whether inhibition of cell cycle could decreas...Background:Astrocytes become reactive following many types of CNS injuries.Excessive astrogliosis is detrimental and contributes to neuronal damage.We sought to determine whether inhibition of cell cycle could decrease the proliferation of astroglial cells and therefore reduce excessive gliosis and glial scar formation after focal ischemia.Methods:Cerebral infarction model was induced by photothrombosis method.Rats were examined using MRI,and lesion volumes were estimated on day 3 post-infarction.The expression of glial fibrillary acidic protein(GFAP) and proliferating cell nuclear antigen(PCNA) was observed by immunofluorescence staining.Protein levels for GFAP,PCNA,Cyclin A and Cyclin B1 were determined by Western blot analysis from the ischemic and sham animals sacrificed at 3,7,30 days after operation.Results:Cell cycle inhibitor olomoucine significantly suppressed GFAP and PCNA expression and reduced lesion volume after cerebral ischemia.In parallel studies,we found dense astroglial scar in boundary zone of vehicle-treated rats at 7 and 30 days.Olomoucine can markedly attenuate astroglial scar formation.Western blot analysis showed increased protein levels of GFAP,PCNA,Cyclin A and Cyclin B1 after ischemia,which was reduced by olomoucine treatment.Conclusion: Our results suggested that astroglial activation,proliferation and subsequently astroglial scar formation could be partially inhibited by regulation of cell cycle.Cell cycle modulation thereby provides a potential promising strategy to treat cerebral ischemia.展开更多
基金the National Science Foundation of China(C30230140,C30400142)
文摘Objective:To determine if a cell cycle inhibitior, olomoucine, would decrease neuronal cell death, limit astroglial proliferation and production of inhibitory CSPGs, and eventually enhance the functional compensation after SCI in rats. Methods: Three were used as un-operated controls and twelve as sham operated controls. Following spinal cord injury, 48 rats were randomly and blindly assigned to either olomoucine (n=24) or vehicle treatment (n=24) groups. Results: Up-regulations of cell cycle components were closely associated with neuronal cell death and astroglial proliferation as well as the production of CSPGs after SCI. Meanwhile, administration of olomoucine, a selective cell cycle kinase (CDK) inhibitor, has remarkably reduced the up-regulated cell cycle proteins and then decreased neuronal cell death, astroglial proliferation as well as accumulation of CSPGs. More importantly, the treatment with olomoucine has also increased expression of growth-associated proteins-43 (GAP-43), reduced the cavity formation, and improved functional deficits. Conclusion: Suppressing astroglial cell cycle in acute spinal cord injuries is beneficial to axonal growth. in turn, the future therapeutic strategies can be designed to achieve efficient axonal regeneration and functional compensation after traumatic CNS injury.
基金This study was supported by a grant from the National Nature Science Foundation of China(No.30230140,30400142)
文摘Background:Astrocytes become reactive following many types of CNS injuries.Excessive astrogliosis is detrimental and contributes to neuronal damage.We sought to determine whether inhibition of cell cycle could decrease the proliferation of astroglial cells and therefore reduce excessive gliosis and glial scar formation after focal ischemia.Methods:Cerebral infarction model was induced by photothrombosis method.Rats were examined using MRI,and lesion volumes were estimated on day 3 post-infarction.The expression of glial fibrillary acidic protein(GFAP) and proliferating cell nuclear antigen(PCNA) was observed by immunofluorescence staining.Protein levels for GFAP,PCNA,Cyclin A and Cyclin B1 were determined by Western blot analysis from the ischemic and sham animals sacrificed at 3,7,30 days after operation.Results:Cell cycle inhibitor olomoucine significantly suppressed GFAP and PCNA expression and reduced lesion volume after cerebral ischemia.In parallel studies,we found dense astroglial scar in boundary zone of vehicle-treated rats at 7 and 30 days.Olomoucine can markedly attenuate astroglial scar formation.Western blot analysis showed increased protein levels of GFAP,PCNA,Cyclin A and Cyclin B1 after ischemia,which was reduced by olomoucine treatment.Conclusion: Our results suggested that astroglial activation,proliferation and subsequently astroglial scar formation could be partially inhibited by regulation of cell cycle.Cell cycle modulation thereby provides a potential promising strategy to treat cerebral ischemia.
