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
High mobility group box 1(HMGB1),when released extracellularly,plays a pivotal role in the development of spinal cord synapses and exacerbates autoimmune diseases within the central nervous system.In experimental auto...High mobility group box 1(HMGB1),when released extracellularly,plays a pivotal role in the development of spinal cord synapses and exacerbates autoimmune diseases within the central nervous system.In experimental autoimmune encephalomyelitis(EAE),a condition that models multiple sclerosis,the levels of extracellular HMGB1 and interleukin-33(IL-33)have been found to be inversely correlated.However,the mechanism by which IL-33 deficiency enhances HMGB1 release during EAE remains elusive.Our study elucidates a potential signaling pathway whereby the absence of IL-33 leads to increased binding of P300/CBP-associated factor with HMGB1 in the nuclei of astrocytes,upregulating HMGB1 acetylation and promoting its release from astrocyte nuclei in the spinal cord of EAE mice.Conversely,the addition of IL-33 counteracts the TNF-α-induced increase in HMGB1 and acetylated HMGB1 levels in primary astrocytes.These findings underscore the potential of IL-33-associated signaling pathways as a therapeutic target for EAE treatment.展开更多
Following the publication,concerns have been raised about a number of figures in this article.An unexpected area of similarity was identified in terms of the cellular data,where the results from differently performed ...Following the publication,concerns have been raised about a number of figures in this article.An unexpected area of similarity was identified in terms of the cellular data,where the results from differently performed experiments were intended to have been shown,although the areas immediately surrounding this area featured comparatively different distributions of cells.展开更多
The NSC-34 cell line is a widely recognized motor neuron model and various neuronal differentiation protocols have been exploited. Under previously reported experimental conditions, only part of the cells resemble dif...The NSC-34 cell line is a widely recognized motor neuron model and various neuronal differentiation protocols have been exploited. Under previously reported experimental conditions, only part of the cells resemble differentiated neurons;however, they do not exhibit extensive and time-prolonged neuritogenesis, and maintain their duplication capacity in culture. The aim of the present work was to facilitate long-term and more homogeneous neuronal differentiation in motor neuron–like NSC-34 cells. We found that the antimitotic drug cytosine arabinoside promoted robust and persistent neuronal differentiation in the entire cell population. Long and interconnecting neuronal processes with abundant growth cones were homogeneously induced and were durable for up to at least 6 weeks in culture. Moreover, cytosine arabinoside was permissive, dispensable, and mostly irreversible in priming NSC-34 cells for neurite initiation and regeneration after mechanical dislodgement. Finally, the expression of the cell proliferation antigen Ki67 was inhibited by cytosine arabinoside, whereas the expression levels of neuronal growth associated protein 43, vimentin, and motor neuron–specific p75, Islet2, homeobox 9 markers were upregulated, as confirmed by western blot and/or confocal immunofluorescence analysis. Overall, these findings support the use of NSC-34 cells as a motor neuron model for properly investigating neurodegenerative mechanisms and prospectively identifying neuroprotective strategies.展开更多
目的:应用p75NTR进行人食管肿瘤干细胞的分选,并对其生物学特性进行鉴定。方法:对人食管癌标本癌细胞及食管癌细胞株TE-1、Eca109进行培养,应用流式细胞仪检测p75NTR在人食管癌细胞(esophageal cancer cells,ECCs)中的表达,应用磁珠分选...目的:应用p75NTR进行人食管肿瘤干细胞的分选,并对其生物学特性进行鉴定。方法:对人食管癌标本癌细胞及食管癌细胞株TE-1、Eca109进行培养,应用流式细胞仪检测p75NTR在人食管癌细胞(esophageal cancer cells,ECCs)中的表达,应用磁珠分选(MACS)法进行p75NTR阳性细胞与阴性细胞的分选,观察p75NTR阳性细胞的增殖、分化及软琼脂克隆形成能力,并进行裸鼠接种以观察其致瘤能力;应用化疗药物作用于ECCs后检测其中p75NTR阳性细胞与阴性细胞存活率,以评价p75NTR阳性细胞对化疗药物的耐受性。结果:8个食管肿瘤细胞系(株)中,除SHEC-1、SHEC-5未检测到p75NTR阳性细胞外,其余6个细胞系(株)SHEC-4、SHEC-6、SHEC-7、SHEC-8、Eca109、TE-1中均检测到p75NTR阳性细胞,阳性细胞比例分别为2.71%、0.32%、3.35%、1.13%、2.15%、0.45%。与阴性及未分选细胞相比,MACS分选后的p75NTR阳性细胞具有较强的增殖能力,具有分化产生其他表型细胞的能力,在软琼脂中具有较强的克隆形成能力(P<0.01);行裸鼠接种时,p75NTR阳性细胞表现出较强的致瘤性,其中SHEC-7细胞只需2×103个即可致瘤,其致瘤能力是未分选细胞的50倍。化疗药物分别作用于p75NTR阳性细胞与阴性细胞48h后,p75NTR阳性细胞的存活比例明显高于阴性细胞(P<0.05)。结论:人食管肿瘤细胞中p75NTR阳性细胞具有自我更新、分化、增殖能力,对化疗药物具有较强的耐受性,并具有较强的致瘤能力,具有肿瘤干细胞的特性。展开更多
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.
基金supported by the National Natural Science Foundation of China(82001281 and 82371195)Hubei Provincial Natural Science Foundation of China for Distinguished Young Scholars(2022CFA104)the Research Fund of Jianghan University(2022XKZX28).
文摘High mobility group box 1(HMGB1),when released extracellularly,plays a pivotal role in the development of spinal cord synapses and exacerbates autoimmune diseases within the central nervous system.In experimental autoimmune encephalomyelitis(EAE),a condition that models multiple sclerosis,the levels of extracellular HMGB1 and interleukin-33(IL-33)have been found to be inversely correlated.However,the mechanism by which IL-33 deficiency enhances HMGB1 release during EAE remains elusive.Our study elucidates a potential signaling pathway whereby the absence of IL-33 leads to increased binding of P300/CBP-associated factor with HMGB1 in the nuclei of astrocytes,upregulating HMGB1 acetylation and promoting its release from astrocyte nuclei in the spinal cord of EAE mice.Conversely,the addition of IL-33 counteracts the TNF-α-induced increase in HMGB1 and acetylated HMGB1 levels in primary astrocytes.These findings underscore the potential of IL-33-associated signaling pathways as a therapeutic target for EAE treatment.
文摘Following the publication,concerns have been raised about a number of figures in this article.An unexpected area of similarity was identified in terms of the cellular data,where the results from differently performed experiments were intended to have been shown,although the areas immediately surrounding this area featured comparatively different distributions of cells.
基金supported by FATALSDrug Project [Progetti di Ricerca@CNR SAC.AD002.173.058] from National Research Council,Italy (to CV)。
文摘The NSC-34 cell line is a widely recognized motor neuron model and various neuronal differentiation protocols have been exploited. Under previously reported experimental conditions, only part of the cells resemble differentiated neurons;however, they do not exhibit extensive and time-prolonged neuritogenesis, and maintain their duplication capacity in culture. The aim of the present work was to facilitate long-term and more homogeneous neuronal differentiation in motor neuron–like NSC-34 cells. We found that the antimitotic drug cytosine arabinoside promoted robust and persistent neuronal differentiation in the entire cell population. Long and interconnecting neuronal processes with abundant growth cones were homogeneously induced and were durable for up to at least 6 weeks in culture. Moreover, cytosine arabinoside was permissive, dispensable, and mostly irreversible in priming NSC-34 cells for neurite initiation and regeneration after mechanical dislodgement. Finally, the expression of the cell proliferation antigen Ki67 was inhibited by cytosine arabinoside, whereas the expression levels of neuronal growth associated protein 43, vimentin, and motor neuron–specific p75, Islet2, homeobox 9 markers were upregulated, as confirmed by western blot and/or confocal immunofluorescence analysis. Overall, these findings support the use of NSC-34 cells as a motor neuron model for properly investigating neurodegenerative mechanisms and prospectively identifying neuroprotective strategies.
文摘目的:应用p75NTR进行人食管肿瘤干细胞的分选,并对其生物学特性进行鉴定。方法:对人食管癌标本癌细胞及食管癌细胞株TE-1、Eca109进行培养,应用流式细胞仪检测p75NTR在人食管癌细胞(esophageal cancer cells,ECCs)中的表达,应用磁珠分选(MACS)法进行p75NTR阳性细胞与阴性细胞的分选,观察p75NTR阳性细胞的增殖、分化及软琼脂克隆形成能力,并进行裸鼠接种以观察其致瘤能力;应用化疗药物作用于ECCs后检测其中p75NTR阳性细胞与阴性细胞存活率,以评价p75NTR阳性细胞对化疗药物的耐受性。结果:8个食管肿瘤细胞系(株)中,除SHEC-1、SHEC-5未检测到p75NTR阳性细胞外,其余6个细胞系(株)SHEC-4、SHEC-6、SHEC-7、SHEC-8、Eca109、TE-1中均检测到p75NTR阳性细胞,阳性细胞比例分别为2.71%、0.32%、3.35%、1.13%、2.15%、0.45%。与阴性及未分选细胞相比,MACS分选后的p75NTR阳性细胞具有较强的增殖能力,具有分化产生其他表型细胞的能力,在软琼脂中具有较强的克隆形成能力(P<0.01);行裸鼠接种时,p75NTR阳性细胞表现出较强的致瘤性,其中SHEC-7细胞只需2×103个即可致瘤,其致瘤能力是未分选细胞的50倍。化疗药物分别作用于p75NTR阳性细胞与阴性细胞48h后,p75NTR阳性细胞的存活比例明显高于阴性细胞(P<0.05)。结论:人食管肿瘤细胞中p75NTR阳性细胞具有自我更新、分化、增殖能力,对化疗药物具有较强的耐受性,并具有较强的致瘤能力,具有肿瘤干细胞的特性。
