Studies have snown that serum response factor is beneficaial for axonar regeneration of peripheral herves.However,Its role after central nervous system injury remains unclear. In this study,we established a rat model ...Studies have snown that serum response factor is beneficaial for axonar regeneration of peripheral herves.However,Its role after central nervous system injury remains unclear. In this study,we established a rat model of T9-T10 spinal cord transection injury.We found that the expression of serum response factor in injured spinal cord gray matter neurons gradually increased with time,reached its peak on the 7^(th) day,and then gradually decreased.To investigate the role of serum response factor,we used lentivirus vecto rs to ove rexpress and silence serum response factor in spinal cord tissue.We found that overexpression of serum response factor promoted motor function recovery in rats with spinal cord injury.Qualitative observation of biotinylated dextran amine anterograde tra cing showed that ove rexpression of serum response factor increased nerve fibers in the injured spinal co rd.Additionally,transmission electron microscopy showed that axon and myelin sheath morphology was restored.Silencing serum response factor had the opposite effects of ove rexpression.These findings suggest that serum response factor plays a role in the recovery of motor function after spinal cord injury.The underlying mechanism may be related to the regulation of axonal regeneration.展开更多
Serum response factor(SRF) is a transcription factor that regulates many genes involved in cellular activities such as proliferation,migration,differentiation,angiogenesis,and apoptosis.Although it has only been known...Serum response factor(SRF) is a transcription factor that regulates many genes involved in cellular activities such as proliferation,migration,differentiation,angiogenesis,and apoptosis.Although it has only been known for about two decades,SRF has been studied extensively.To date,over a thousand SRF studies have been published,but it still remains a hot topic.Due to its critical role in mesoderm-derived tissues,most of the SRF studies focused on muscle structure/function,cardiovascular development/maintenance,and smooth muscle generation/repair.Recently,SRF has received more attention in the digestive field and several important discoveries have been made.This review will summarize what we have learned about SRF in the gastrointestinal tract and provide insights into possible future directions in this area.展开更多
Purpose： Microgravity is known to cause endothelium dysfunction in astronauts returning from spaceflight. We aimed to reveal the regulatory mechanism in alterations of human endothelial cells after simulated microgra...Purpose： Microgravity is known to cause endothelium dysfunction in astronauts returning from spaceflight. We aimed to reveal the regulatory mechanism in alterations of human endothelial cells after simulated microgravity （SMG）. Methods： We utilized the rotary cell culture system （RCCS-1） to explore the subsequent effects of SMG on human umbilical vein endothelial cells （HUVECs）. Results： SMG-treated HUVECs appeared obvious growth inhibition after return to normal gravity, which might be attributed to a set of responses including alteration of cytoskeleton, decreased cell adhesion capacity and increased apoptosis. Expression levels of mTOR and its downstream Apaf-1 were increased during subsequent culturing after SMG. miR-22 was up-regulated and its target genes SRF and LAMC1 were down-regulated at mRNA levels. LAMC1 siRNAs reduced cell adhesion rate and inhibited stress fiber formation while SRF siRNAs caused apoptosis. Conclusion： SMG has the subsequent biological effects on HUVECs, resulting in growth inhibition through mTOR signaling and miR-22-mediated mechanism.展开更多
基金supported by the National Natural Science Foundation of China,No.81 8 70985 (to FH)Project of Shandong Province Higher Education Science and Technology Program,No.J18KA258 (to NLZ)+1 种基金Xu Rongxiang Regenerative Medicine Science and Technology Program of Binzhou Medical University,No.BY2020XRX06 (to NLZ)the Natural Science Foundation of Shandong Province,No.BS2015SW021 (to NLZ)。
文摘Studies have snown that serum response factor is beneficaial for axonar regeneration of peripheral herves.However,Its role after central nervous system injury remains unclear. In this study,we established a rat model of T9-T10 spinal cord transection injury.We found that the expression of serum response factor in injured spinal cord gray matter neurons gradually increased with time,reached its peak on the 7^(th) day,and then gradually decreased.To investigate the role of serum response factor,we used lentivirus vecto rs to ove rexpress and silence serum response factor in spinal cord tissue.We found that overexpression of serum response factor promoted motor function recovery in rats with spinal cord injury.Qualitative observation of biotinylated dextran amine anterograde tra cing showed that ove rexpression of serum response factor increased nerve fibers in the injured spinal co rd.Additionally,transmission electron microscopy showed that axon and myelin sheath morphology was restored.Silencing serum response factor had the opposite effects of ove rexpression.These findings suggest that serum response factor plays a role in the recovery of motor function after spinal cord injury.The underlying mechanism may be related to the regulation of axonal regeneration.
基金Supported by The Department of Veterans Affairs of the United States and the American Heart Association grants to Dr Chai J
文摘Serum response factor(SRF) is a transcription factor that regulates many genes involved in cellular activities such as proliferation,migration,differentiation,angiogenesis,and apoptosis.Although it has only been known for about two decades,SRF has been studied extensively.To date,over a thousand SRF studies have been published,but it still remains a hot topic.Due to its critical role in mesoderm-derived tissues,most of the SRF studies focused on muscle structure/function,cardiovascular development/maintenance,and smooth muscle generation/repair.Recently,SRF has received more attention in the digestive field and several important discoveries have been made.This review will summarize what we have learned about SRF in the gastrointestinal tract and provide insights into possible future directions in this area.
基金This study was supported by the ＂National Natural Science Foundation of China （No, 31270903）＂ and the Fundamental Research Funds for the Central Universities （3132016330）,
文摘Purpose： Microgravity is known to cause endothelium dysfunction in astronauts returning from spaceflight. We aimed to reveal the regulatory mechanism in alterations of human endothelial cells after simulated microgravity （SMG）. Methods： We utilized the rotary cell culture system （RCCS-1） to explore the subsequent effects of SMG on human umbilical vein endothelial cells （HUVECs）. Results： SMG-treated HUVECs appeared obvious growth inhibition after return to normal gravity, which might be attributed to a set of responses including alteration of cytoskeleton, decreased cell adhesion capacity and increased apoptosis. Expression levels of mTOR and its downstream Apaf-1 were increased during subsequent culturing after SMG. miR-22 was up-regulated and its target genes SRF and LAMC1 were down-regulated at mRNA levels. LAMC1 siRNAs reduced cell adhesion rate and inhibited stress fiber formation while SRF siRNAs caused apoptosis. Conclusion： SMG has the subsequent biological effects on HUVECs, resulting in growth inhibition through mTOR signaling and miR-22-mediated mechanism.
