The mammalian brain has an extremely limited ability to regenerate lost neurons and to recover function following ischemic stroke.A biomaterial strategy of slowly-releasing various regeneration-promoting factors to ac...The mammalian brain has an extremely limited ability to regenerate lost neurons and to recover function following ischemic stroke.A biomaterial strategy of slowly-releasing various regeneration-promoting factors to activate endogenous neurogenesis represents a safe and practical neuronal replacement therapy.In this study,basic fibroblast growth factor(bFGF)-Chitosan gel is injected into the stroke cavity.This approach promotes the proliferation of vascular endothelial cell,the formation of functional vascular network,and the final restoration of cerebral blood flow.Additionally,bFGF-Chitosan gel activates neural progenitor cells(NPCs)in the subventricular zone(SVZ),promotes the NPCs’migration toward the stroke cavity and differentiation into mature neurons with diverse cell types(inhibitory gamma-aminobutyric acid neurons and excitatory glutamatergic neuron)and layer architecture(superficial cortex and deep cortex).These new-born neurons form functional synaptic connections with the host brain and reconstruct nascent neural networks.Furthermore,synaptogenesis in the stroke cavity and Nestin lineage cells respectively contribute to the improvement of sensorimotor function induced by bFGF-Chitosan gel after ischemic stroke.Lastly,bFGF-Chitosan gel inhibits microglia activation in the peri-infarct cortex.Our findings indicate that filling the stroke cavity with bFGF-Chitosan“brain glue”promotes angiogenesis,endogenous neurogenesis and synaptogenesis to restore function,offering innovative ideas and methods for the clinical treatment of ischemic stroke.展开更多
The effect of collagen-chitosan membrane with different proportionate collagen and bFGF were investigated for culture human fibroblast. The optimum weight ratio of collagen/chitoson and bFGF were selected. Using cultu...The effect of collagen-chitosan membrane with different proportionate collagen and bFGF were investigated for culture human fibroblast. The optimum weight ratio of collagen/chitoson and bFGF were selected. Using culture human fibroblast technologies and cytotoxicity evaluated in vitro, Cell morphology was observed. Experimental results show that collagen-chitosan with bFGF promoted human fibroblast adhesion and supported cell proliferation for a long time. Furthermore collagen-chitosan membrane obviously degrade after 18d when human fibroblast was exhibited fusion spreading, compacting and stabilize. Cytotoxic to human fibroblast was revealed very low . Collagen- chitosan with bFGF should be useful as a tissue engineering biomaterial scaffold for cell culture.展开更多
基金supported by the National Natural Science Foundation of China,Nos.31730030(to XL),82272171(to ZY),82271403(to XL),81941011(to XL),31971279(to ZY),31771053(to HD),82472244(to XZ),82272116(to LC)the Natural Science Foundation of Beijing,No.7222004(to HD)Science and Technology Innovation Plan of Shanghai Science and Technology Commission,No.23Y31900300(to YM).the CAMS Initiative for Innovative Medicine,2021-1-I2M-019(to XB),National High Level Hospital Clinical Research Funding,2022-PUMCH-C-042(to XB).
文摘The mammalian brain has an extremely limited ability to regenerate lost neurons and to recover function following ischemic stroke.A biomaterial strategy of slowly-releasing various regeneration-promoting factors to activate endogenous neurogenesis represents a safe and practical neuronal replacement therapy.In this study,basic fibroblast growth factor(bFGF)-Chitosan gel is injected into the stroke cavity.This approach promotes the proliferation of vascular endothelial cell,the formation of functional vascular network,and the final restoration of cerebral blood flow.Additionally,bFGF-Chitosan gel activates neural progenitor cells(NPCs)in the subventricular zone(SVZ),promotes the NPCs’migration toward the stroke cavity and differentiation into mature neurons with diverse cell types(inhibitory gamma-aminobutyric acid neurons and excitatory glutamatergic neuron)and layer architecture(superficial cortex and deep cortex).These new-born neurons form functional synaptic connections with the host brain and reconstruct nascent neural networks.Furthermore,synaptogenesis in the stroke cavity and Nestin lineage cells respectively contribute to the improvement of sensorimotor function induced by bFGF-Chitosan gel after ischemic stroke.Lastly,bFGF-Chitosan gel inhibits microglia activation in the peri-infarct cortex.Our findings indicate that filling the stroke cavity with bFGF-Chitosan“brain glue”promotes angiogenesis,endogenous neurogenesis and synaptogenesis to restore function,offering innovative ideas and methods for the clinical treatment of ischemic stroke.
文摘The effect of collagen-chitosan membrane with different proportionate collagen and bFGF were investigated for culture human fibroblast. The optimum weight ratio of collagen/chitoson and bFGF were selected. Using culture human fibroblast technologies and cytotoxicity evaluated in vitro, Cell morphology was observed. Experimental results show that collagen-chitosan with bFGF promoted human fibroblast adhesion and supported cell proliferation for a long time. Furthermore collagen-chitosan membrane obviously degrade after 18d when human fibroblast was exhibited fusion spreading, compacting and stabilize. Cytotoxic to human fibroblast was revealed very low . Collagen- chitosan with bFGF should be useful as a tissue engineering biomaterial scaffold for cell culture.
