We investigated nerve growth factor precursor （proNGF） and mature NGF expression in ischemic and non-ischemic cortices after cerebral ischemia-reperfusion injury. In both ischemic and non-ischemic cortices, proNGF w...We investigated nerve growth factor precursor （proNGF） and mature NGF expression in ischemic and non-ischemic cortices after cerebral ischemia-reperfusion injury. In both ischemic and non-ischemic cortices, proNGF was found to be present in the extracellular space and cytoplasm. In addition, mature NGF was expressed in extracellular space, but with a very low signal. In ischemic cortex only, proNGF was significantly decreased, reaching a minimal level at 1 day. Mature NGF was increased at 4 hours, then reached a minimal level at 3 days. The p75 neurotrophin receptor （p75NTR） was significantly decreased after ischemia, and increased at 3 days after ischemia. These results confirmed that proNGF was the predominant form of NGF during the pathological process of cerebral ischemia-repeffusion injury. In addition, our findings suggest that ischemic injury may influence the conversion of proNGF to mature NGF, and that proNGF/p75NTR may be involved in reperfusion injury.展开更多
BACKGROUND： Neuronal apoptosis in perihematomal brain tissues following intracerebral hemorrhage is strongly related to the formation of a compound signal pathway between nerve growth factor precursor （proNGF）, p75...BACKGROUND： Neuronal apoptosis in perihematomal brain tissues following intracerebral hemorrhage is strongly related to the formation of a compound signal pathway between nerve growth factor precursor （proNGF）, p75NTR, and sortilin receptor. Sortilin acts as a co-receptor and molecular switch governing the p75NTR-mediated pro-apoptotic signal induced by proNGF. OBJECTIVE： To investigate proNGF and sortilin expressions in perihematomal brain tissues following intracerebral hemorrhage, and to study the effects of proNGF and sortilin on secondary cell apoptosis. DESIGN, TIME AND SETTING： A paired, comparison study was performed at the Laboratory of Histology and Embryology, Xi＇an Jiaotong University from October 2007 to September 2008. MATERIALS： Brain tissue samples were obtained from 15 patients with intracerebral hemorrhage, who were treated at the Department of Neurosurgery, First Affiliated Hospital, Medical College of Xi＇an Jiaotong University from October 2007 to March 2008. Rabbit anti-proNGF polyclonal antibody was provided by Chemicon, USA; rabbit anti-sortilin polyclonal antibody by Abcam, UK; and TUNEL kit by Promega, USA. METHODS： Perihematomal brain tissues selected 0.5 cm from the hemorrhage area were considered to be the hemorrhage group, while brain tissues from the middle temporal gyrus served as the control group. MAIN OUTCOME MEASURES： Histopathological changes were detected using hematoxylin-eosin staining, cell apoptosis was determined using the TUNEL method, and proNGF and sortilin expressions were determined using immunohistochemistry. RESULTS： Edema was clearly observed in perihematomal brain tissues, and infiltration of inflammatory cells was visible, with the presence of irregular and necrotic bodies. The apoptotic rate in the hemorrhage group was significantly greater than in the control group （P 〈 0.01）. Moreover, sortilin expression significantly increased （P 〈 0.01）, but proNGF expression remained unchanged （P 〉 0.05）. Correlation analysis suggested that sortilin expression positively correlated with apoptosis （rs = 0.648, P 〈 0.01）. CONCLUSION： proNGF expression was stable, but sortilin expression increased in perihematomal brain tissues following intracerebral hemorrhage, suggesting that sortilin acted as a co-receptor and molecular switch to govern p75NTR-mediated cell apoptosis.展开更多
This study demonstrated that brain areas surrounding the site of hematoma following intracerebral hemorrhage are characterized by significantly increased apoptosis and expression of neurotrophin receptor p75 and sorti...This study demonstrated that brain areas surrounding the site of hematoma following intracerebral hemorrhage are characterized by significantly increased apoptosis and expression of neurotrophin receptor p75 and sortilin. However, as detected by terminal deoxynucleotidyl transferase dUTP nick end labeling and immunohistochemical staining, there was no significant change in nerve growth factor precursor expression levels. The appearance of neurotrophin receptor p75 expressing cells was positively correlated with cells that were detected by terminal deoxynucleotidyl transferase dUTP nick end labeling. These findings confirm that the nerve growth factor precursor-neurotrophin receptor p75-sortilin heterotrimeric complex-mediated apoptosis pathway may play an important role in cellular apoptosis following intracerebral hemorrhage.展开更多
A rat model of acute ocular hypertension was established by enhancing the perfusion of balanced salt solution in the anterior chamber of the right eye. Minocycline （90 mg/kg） was administered intraperitoneally into ...A rat model of acute ocular hypertension was established by enhancing the perfusion of balanced salt solution in the anterior chamber of the right eye. Minocycline （90 mg/kg） was administered intraperitoneally into rats immediately after the operation for 3 consecutive days. Immunofluorescence, western blot assay and PCR detection revealed that the expression of the precursor form of nerve growth factor, nerve growth factor and the p75 neurotrophin receptor, and the mRNA expression of nerve growth factor and the p75 neurotrophin receptor, increased after acute ocular hypertension. The number of double-labeled CD11B- and precursor form of nerve growth factor-positive cells, glial fibrillary acidic protein- and p75 neurotrophin receptor-positive cells glial fibrillary acidic protein- and caspase-3-positive cells in the retina markedly increased after acute ocular hypertension. The above-described expression decreased after minocycline treatment. These results suggested that minocycline inhibited the increased expression of the precursor form of nerve growth factor in microglia, the p75 neurotrophin receptor in astroglia, and protected cells from apoptosis.展开更多
BACKGROUND Ulcerative colitis(UC)is a chronic inflammatory disease affecting the colon.The most common psychological issue in UC patients is varying degrees of depre-ssion,which affects the condition and quality of li...BACKGROUND Ulcerative colitis(UC)is a chronic inflammatory disease affecting the colon.The most common psychological issue in UC patients is varying degrees of depre-ssion,which affects the condition and quality of life of UC patients and may lead to deterioration of the patient’s condition.UC drugs combined with anti-anxiety and antidepression drugs can alleviate symptoms of both depression and UC.Brain-derived neurotrophic factor(BDNF)precursor(proBDNF)/p75 neurotrophin receptor(p75NTR)/sortilin and BDNF/tropomyosin receptor kinase B(TrkB)signalling balance is essential for maintaining brain homeostasis and preventing the development of depressive behaviours.AIM To explore the mechanism by which Wuling powder regulates the proBDNF/p75NTR/sortilin and BDNF/TrkB pathways in the treatment of UC with depre-ssion.METHODS Depression was established in C57BL/6J mice via chronic restraint stress,and the UC model was induced with dextran sodium sulfate(DSS).In the treatment stage,mesalazine(MS)was the basic treatment,Wuling powder was the experimental treatment,and fluoxetine was the positive control drug for treating depression.Changes in intestinal mucosal inflammation,behaviour,and the proBDNFp75NTR/sortilin and BDNF/TrkB pathways were evaluated.RESULTS In the depression groups,Wuling powder decreased the immobility time,increased the distance travelled in the central zone and the total distance travelled,and restored balance in the proBDNF/p75NTR/sortilin and BDNF/TrkB signalling pathways.In the DSS and chronic restraint stress+DSS groups,immobility time increased,distance travelled in the central zone and total distance travelled decreased,activity of the proBDNF/p75NTR/sortilin pathway was upregulated,and activity of the BDNF/TrkB pathway was downregulated,indicating that mice with UC often have comorbid depression.Compared with those of MS alone,Wuling powder combined with MS further decreased the colon histopathological scores and the expression levels of tumor necrosis factor-alpha and interleukin-6 mRNAs.CONCLUSION This study confirmed that Wuling powder may play an antidepressant role by regulating the balance of the proBDNF/p75NTR/sortilin and BDNF/TrkB signalling pathways and further relieve intestinal inflammation in UC.展开更多
背景:中枢神经系统髓鞘再生是由脱髓鞘事件触发的基本修复过程,主要通过少突胶质细胞前体细胞增殖、迁移并向少突胶质细胞分化进而再生髓鞘。髓鞘再生过程受到多种因素如星形胶质细胞、髓鞘碎片、小胶质细胞、巨噬细胞、内皮细胞、周细...背景:中枢神经系统髓鞘再生是由脱髓鞘事件触发的基本修复过程,主要通过少突胶质细胞前体细胞增殖、迁移并向少突胶质细胞分化进而再生髓鞘。髓鞘再生过程受到多种因素如星形胶质细胞、髓鞘碎片、小胶质细胞、巨噬细胞、内皮细胞、周细胞、T细胞以及年龄等的影响。目的:星形胶质细胞在中枢神经系统发挥着调节突触活动、营养支持及组织修复等重要作用。文章通过综述星形胶质细胞在髓鞘再生过程中的作用,旨在为中枢神经系统脱髓鞘疾病提供潜在的治疗靶点。方法:检索2014-2024年在中国知网、PubMed和Web of Science数据库收录的文献,中文检索词:“星形胶质细胞,少突胶质细胞前体细胞,髓鞘再生”,英文检索词:“Astrocyte OR Astroglia*,Oligodendrocyte Precursor Cell*,Remyelination”,经筛选后提取66篇文献进行综述。结果与结论:(1)以多发性硬化为代表的脱髓鞘疾病的治疗主要是疾病修饰疗法,尚无可用的促进髓鞘再生的方法,因此,探索髓鞘再生相关靶点以促进髓鞘再生是十分必要的。(2)髓鞘再生是由少突胶质细胞前体细胞增殖、迁移、分化、成熟为少突胶质细胞,后者产生髓磷脂包裹轴突以形成髓鞘的过程。(3)星形胶质细胞通过吞噬髓鞘碎片、参与炎性反应、向少突胶质细胞谱系细胞转分化、为少突胶质细胞谱系细胞供能、释放神经营养因子、分泌细胞外基质成分等调节髓鞘再生。(4)文章所归纳的药物是以星形胶质细胞及其衍生因子作为干预靶点调控髓鞘再生,部分药物效果尚可,但其有效性及安全性仍需更多的基础研究及临床试验来验证。(5)星形胶质细胞在髓鞘再生过程中的作用机制尚未完全阐明,相关的分子靶点及信号通路有待进一步研究。展开更多
The problem of ulcerative colitis(UC)is becoming increasingly relevant due to its prevalence and combination with psychological disorders.UC is associated with alterations in the intestinal microbiocenosis as one of t...The problem of ulcerative colitis(UC)is becoming increasingly relevant due to its prevalence and combination with psychological disorders.UC is associated with alterations in the intestinal microbiocenosis as one of the factors reducing tolerance to self-antigens.In addition,patients with UC often experience anxiety,depression and other negative emotional and psychological factors aggravating the course of the underlying disease.The study presented by Wang et al shows that the traditional Chinese medicine Wuling can exert its therapeutic effect by reversing the aberrant precursor of brain-derived neurotrophic factor(BDNF)/BDNF signaling in mice with UC and depression.The combination of Wuling powder with mesalazine can exhibit an antidepressant effect and reduce intestinal inflammation.Undoubtedly,the study by Chinese authors deserves attention,and changes in the balance of precursor of BDNF/p75 neurotrophin receptor/sortilin and BDNF/tropomyosin receptor kinase B signaling may become a novel therapeutic target for clinical treatment and further development of research.展开更多
In the aftermath of spinal cord injury,glial restricted precursors（GRPs） and immature astrocytes offer the potential to modulate the inflammatory environment of the injured spinal cord and promote host axon regenera...In the aftermath of spinal cord injury,glial restricted precursors（GRPs） and immature astrocytes offer the potential to modulate the inflammatory environment of the injured spinal cord and promote host axon regeneration.Nevertheless clinical application of cellular therapy for the repair of spinal cord injury requires strict quality-assured protocols for large-scale production and preservation that necessitates long-term in vitro expansion.Importantly,such processes have the potential to alter the phenotypic and functional properties and thus therapeutic potential of these cells.Furthermore,clinical use of cellular therapies may be limited by the inflammatory microenvironment of the injured spinal cord,altering the phenotypic and functional properties of grafted cells.This report simulates the process of large-scale GRP production and demonstrates the permissive properties of GRP following long-term in vitro culture.Furthermore,we defined the phenotypic and functional properties of GRP in the presence of inflammatory factors,and call attention to the importance of the microenvironment of grafted cells,underscoring the importance of modulating the environment of the injured spinal cord.展开更多
基金the National High Technology Program of China (863 Programs), No. 2006AA02A117
文摘We investigated nerve growth factor precursor （proNGF） and mature NGF expression in ischemic and non-ischemic cortices after cerebral ischemia-reperfusion injury. In both ischemic and non-ischemic cortices, proNGF was found to be present in the extracellular space and cytoplasm. In addition, mature NGF was expressed in extracellular space, but with a very low signal. In ischemic cortex only, proNGF was significantly decreased, reaching a minimal level at 1 day. Mature NGF was increased at 4 hours, then reached a minimal level at 3 days. The p75 neurotrophin receptor （p75NTR） was significantly decreased after ischemia, and increased at 3 days after ischemia. These results confirmed that proNGF was the predominant form of NGF during the pathological process of cerebral ischemia-repeffusion injury. In addition, our findings suggest that ischemic injury may influence the conversion of proNGF to mature NGF, and that proNGF/p75NTR may be involved in reperfusion injury.
基金Scientific and Technological Research Developing Program of Shaanxi Province, No. 2007K15-01
文摘BACKGROUND： Neuronal apoptosis in perihematomal brain tissues following intracerebral hemorrhage is strongly related to the formation of a compound signal pathway between nerve growth factor precursor （proNGF）, p75NTR, and sortilin receptor. Sortilin acts as a co-receptor and molecular switch governing the p75NTR-mediated pro-apoptotic signal induced by proNGF. OBJECTIVE： To investigate proNGF and sortilin expressions in perihematomal brain tissues following intracerebral hemorrhage, and to study the effects of proNGF and sortilin on secondary cell apoptosis. DESIGN, TIME AND SETTING： A paired, comparison study was performed at the Laboratory of Histology and Embryology, Xi＇an Jiaotong University from October 2007 to September 2008. MATERIALS： Brain tissue samples were obtained from 15 patients with intracerebral hemorrhage, who were treated at the Department of Neurosurgery, First Affiliated Hospital, Medical College of Xi＇an Jiaotong University from October 2007 to March 2008. Rabbit anti-proNGF polyclonal antibody was provided by Chemicon, USA; rabbit anti-sortilin polyclonal antibody by Abcam, UK; and TUNEL kit by Promega, USA. METHODS： Perihematomal brain tissues selected 0.5 cm from the hemorrhage area were considered to be the hemorrhage group, while brain tissues from the middle temporal gyrus served as the control group. MAIN OUTCOME MEASURES： Histopathological changes were detected using hematoxylin-eosin staining, cell apoptosis was determined using the TUNEL method, and proNGF and sortilin expressions were determined using immunohistochemistry. RESULTS： Edema was clearly observed in perihematomal brain tissues, and infiltration of inflammatory cells was visible, with the presence of irregular and necrotic bodies. The apoptotic rate in the hemorrhage group was significantly greater than in the control group （P 〈 0.01）. Moreover, sortilin expression significantly increased （P 〈 0.01）, but proNGF expression remained unchanged （P 〉 0.05）. Correlation analysis suggested that sortilin expression positively correlated with apoptosis （rs = 0.648, P 〈 0.01）. CONCLUSION： proNGF expression was stable, but sortilin expression increased in perihematomal brain tissues following intracerebral hemorrhage, suggesting that sortilin acted as a co-receptor and molecular switch to govern p75NTR-mediated cell apoptosis.
基金the Science and Technology Research and Development Program of Shaanxi Province, No. 2007K15-01
文摘This study demonstrated that brain areas surrounding the site of hematoma following intracerebral hemorrhage are characterized by significantly increased apoptosis and expression of neurotrophin receptor p75 and sortilin. However, as detected by terminal deoxynucleotidyl transferase dUTP nick end labeling and immunohistochemical staining, there was no significant change in nerve growth factor precursor expression levels. The appearance of neurotrophin receptor p75 expressing cells was positively correlated with cells that were detected by terminal deoxynucleotidyl transferase dUTP nick end labeling. These findings confirm that the nerve growth factor precursor-neurotrophin receptor p75-sortilin heterotrimeric complex-mediated apoptosis pathway may play an important role in cellular apoptosis following intracerebral hemorrhage.
文摘A rat model of acute ocular hypertension was established by enhancing the perfusion of balanced salt solution in the anterior chamber of the right eye. Minocycline （90 mg/kg） was administered intraperitoneally into rats immediately after the operation for 3 consecutive days. Immunofluorescence, western blot assay and PCR detection revealed that the expression of the precursor form of nerve growth factor, nerve growth factor and the p75 neurotrophin receptor, and the mRNA expression of nerve growth factor and the p75 neurotrophin receptor, increased after acute ocular hypertension. The number of double-labeled CD11B- and precursor form of nerve growth factor-positive cells, glial fibrillary acidic protein- and p75 neurotrophin receptor-positive cells glial fibrillary acidic protein- and caspase-3-positive cells in the retina markedly increased after acute ocular hypertension. The above-described expression decreased after minocycline treatment. These results suggested that minocycline inhibited the increased expression of the precursor form of nerve growth factor in microglia, the p75 neurotrophin receptor in astroglia, and protected cells from apoptosis.
文摘BACKGROUND Ulcerative colitis(UC)is a chronic inflammatory disease affecting the colon.The most common psychological issue in UC patients is varying degrees of depre-ssion,which affects the condition and quality of life of UC patients and may lead to deterioration of the patient’s condition.UC drugs combined with anti-anxiety and antidepression drugs can alleviate symptoms of both depression and UC.Brain-derived neurotrophic factor(BDNF)precursor(proBDNF)/p75 neurotrophin receptor(p75NTR)/sortilin and BDNF/tropomyosin receptor kinase B(TrkB)signalling balance is essential for maintaining brain homeostasis and preventing the development of depressive behaviours.AIM To explore the mechanism by which Wuling powder regulates the proBDNF/p75NTR/sortilin and BDNF/TrkB pathways in the treatment of UC with depre-ssion.METHODS Depression was established in C57BL/6J mice via chronic restraint stress,and the UC model was induced with dextran sodium sulfate(DSS).In the treatment stage,mesalazine(MS)was the basic treatment,Wuling powder was the experimental treatment,and fluoxetine was the positive control drug for treating depression.Changes in intestinal mucosal inflammation,behaviour,and the proBDNFp75NTR/sortilin and BDNF/TrkB pathways were evaluated.RESULTS In the depression groups,Wuling powder decreased the immobility time,increased the distance travelled in the central zone and the total distance travelled,and restored balance in the proBDNF/p75NTR/sortilin and BDNF/TrkB signalling pathways.In the DSS and chronic restraint stress+DSS groups,immobility time increased,distance travelled in the central zone and total distance travelled decreased,activity of the proBDNF/p75NTR/sortilin pathway was upregulated,and activity of the BDNF/TrkB pathway was downregulated,indicating that mice with UC often have comorbid depression.Compared with those of MS alone,Wuling powder combined with MS further decreased the colon histopathological scores and the expression levels of tumor necrosis factor-alpha and interleukin-6 mRNAs.CONCLUSION This study confirmed that Wuling powder may play an antidepressant role by regulating the balance of the proBDNF/p75NTR/sortilin and BDNF/TrkB signalling pathways and further relieve intestinal inflammation in UC.
文摘背景:中枢神经系统髓鞘再生是由脱髓鞘事件触发的基本修复过程,主要通过少突胶质细胞前体细胞增殖、迁移并向少突胶质细胞分化进而再生髓鞘。髓鞘再生过程受到多种因素如星形胶质细胞、髓鞘碎片、小胶质细胞、巨噬细胞、内皮细胞、周细胞、T细胞以及年龄等的影响。目的:星形胶质细胞在中枢神经系统发挥着调节突触活动、营养支持及组织修复等重要作用。文章通过综述星形胶质细胞在髓鞘再生过程中的作用,旨在为中枢神经系统脱髓鞘疾病提供潜在的治疗靶点。方法:检索2014-2024年在中国知网、PubMed和Web of Science数据库收录的文献,中文检索词:“星形胶质细胞,少突胶质细胞前体细胞,髓鞘再生”,英文检索词:“Astrocyte OR Astroglia*,Oligodendrocyte Precursor Cell*,Remyelination”,经筛选后提取66篇文献进行综述。结果与结论:(1)以多发性硬化为代表的脱髓鞘疾病的治疗主要是疾病修饰疗法,尚无可用的促进髓鞘再生的方法,因此,探索髓鞘再生相关靶点以促进髓鞘再生是十分必要的。(2)髓鞘再生是由少突胶质细胞前体细胞增殖、迁移、分化、成熟为少突胶质细胞,后者产生髓磷脂包裹轴突以形成髓鞘的过程。(3)星形胶质细胞通过吞噬髓鞘碎片、参与炎性反应、向少突胶质细胞谱系细胞转分化、为少突胶质细胞谱系细胞供能、释放神经营养因子、分泌细胞外基质成分等调节髓鞘再生。(4)文章所归纳的药物是以星形胶质细胞及其衍生因子作为干预靶点调控髓鞘再生,部分药物效果尚可,但其有效性及安全性仍需更多的基础研究及临床试验来验证。(5)星形胶质细胞在髓鞘再生过程中的作用机制尚未完全阐明,相关的分子靶点及信号通路有待进一步研究。
文摘The problem of ulcerative colitis(UC)is becoming increasingly relevant due to its prevalence and combination with psychological disorders.UC is associated with alterations in the intestinal microbiocenosis as one of the factors reducing tolerance to self-antigens.In addition,patients with UC often experience anxiety,depression and other negative emotional and psychological factors aggravating the course of the underlying disease.The study presented by Wang et al shows that the traditional Chinese medicine Wuling can exert its therapeutic effect by reversing the aberrant precursor of brain-derived neurotrophic factor(BDNF)/BDNF signaling in mice with UC and depression.The combination of Wuling powder with mesalazine can exhibit an antidepressant effect and reduce intestinal inflammation.Undoubtedly,the study by Chinese authors deserves attention,and changes in the balance of precursor of BDNF/p75 neurotrophin receptor/sortilin and BDNF/tropomyosin receptor kinase B signaling may become a novel therapeutic target for clinical treatment and further development of research.
基金supported by NIH PO1 NS055976,CraigH.Neilsen Foundation
文摘In the aftermath of spinal cord injury,glial restricted precursors（GRPs） and immature astrocytes offer the potential to modulate the inflammatory environment of the injured spinal cord and promote host axon regeneration.Nevertheless clinical application of cellular therapy for the repair of spinal cord injury requires strict quality-assured protocols for large-scale production and preservation that necessitates long-term in vitro expansion.Importantly,such processes have the potential to alter the phenotypic and functional properties and thus therapeutic potential of these cells.Furthermore,clinical use of cellular therapies may be limited by the inflammatory microenvironment of the injured spinal cord,altering the phenotypic and functional properties of grafted cells.This report simulates the process of large-scale GRP production and demonstrates the permissive properties of GRP following long-term in vitro culture.Furthermore,we defined the phenotypic and functional properties of GRP in the presence of inflammatory factors,and call attention to the importance of the microenvironment of grafted cells,underscoring the importance of modulating the environment of the injured spinal cord.
