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| 1 | Construction of Ad-EGFP-BDNF vector and its expression in neural stem cells显示文摘BACKGROUND:Brain-derived neurotrophic factor(BDNF) provides nourishment to injured neurons.Neural stem cells can differentiate into neurons to repair neuronal injury in vivo.It has been hypothesized that continuous secretion of BDNF from neural stem cells could benefit brain injury repair.OBJECTIVE:To transfect BDNF and enhanced green fluorescent protein(EGFP) into neural stem cells with adenovirus vector and to observe expression of BDNF and EGFP in transfected neural stem cells.DESIGN,TIME AND SETTING:Observational,cellular,molecular study was performed at the Biochemistry Laboratory,Tongji University School of Medicine,China from July 2004 to September 2006.MATERIALS:Neural stem cells were provided by the Anatomy and Histoembryology Laboratory of Fudan University Medical School,China.METHODS:BDNF cDNA was extracted by reverse transcription polymerase chain reaction from the rat hippocampus.Following gene cloning and packaging by HEK293.BDNF,the EGFP gene was transfected into cultured neural stem cells with the Ad-EGFP-BDNF vector.BDNF-expressing neural stem cell clones were selected by G418 selection.MAIN OUTCOME MEASURES:EGFP expression and cell morphology were observed by fluorescent microscopy;neural stem cell expressing BDNF mRNA was examined by reverse transcription polymerase chain reaction;BDNF expression was detected by enzyme-linked immunosorbent assay from supernatant of infected neural stem cells.RESULTS:High transfection efficiency was obtained using 5 × 108 virus titers to transfect neural stem cells.G418-resistant neural stem cell clones integrated BDNF mRNA fragments.Enzyme-linked immunosorbent assay results showed that BDNF expression in the supernatant increased with increasing culture time and peaked at 72 hours.CONCLUSION:Adenovirus-mediated BDNF and EGFP genes were successfully transfected into neural stem cells and were expressed in neural stem cells for a long period of time. | Shaohua Li Zhenhua Li Huilong Wen Xin Gu Yinjiang Cui Yang Wang Lixia Lu Yanna Li Manli Na | 2010 | Neural Regeneration Research2010，5，13： | 1 |
| 2 | Analysis of parental genetic diversity and its impact on grain yield and quality of japonica hybrid rice in northern China显示文摘The relationship between parental genetic differences and the quality and yield of japonica hybrid rice strongly influences japonica hybrid rice breeding.In this study,137 parental lines of japonica hybrid rice were genotyped using 8 K rice SNP-Chips to characterize their genetic diversity,population structure,and indica-genotype proportion.The genetic diversity of total parental lines averaged 0.264,with values of0.287 for restorer lines and 0.148 for the sterile lines.The introduction of indica lineage increased the genetic diversity of restorer lines relative to that of sterile lines.By model-based population structure analysis,the 137 lines were divided into 14 groups.According to the grouping results,eight restorer lines and five sterile lines were selected from different groups for cross breeding,yielding 40 japonica hybrid rice combinations(F1).Investigation of the yield and quality of these combinations showed that highyield combinations could be obtained by increasing parental genetic distance to 0.8–0.9,a result accomplished largely by the introduction of indica genomic components of restorer lines.To further improve grain quality,the genetic distance between parents should be reduced to 0.4–0.5,suggesting an indicagenotype proportion of 30%–40%for restorer lines.This study may provide a reference for breeding of japonica hybrid rice. | Hong Gao Zuobin Ma Yuanzheng Wang Manli Zhang Xianju Wang Changhua Wang Zhiqiang Tang Liying Zhang Liang Fu Na He Hui Wang Yongan Yin Yuanjun Bai Guomin Sui Wenjing Zheng | 2022 | The Crop Journal2022，10，3： | 1 |
| 3 | Identifying a confused cell identity for esophageal squamous cell carcinoma显示文摘The cell identity of malignant cells and how they acquire it are fundamental for our understanding of cancer.Here,we report that esophageal squamous cell carcinoma(ESCC)cells display molecular features equally similar but distinct to all three types of normal esophageal epithelial cells,which we term as confused cell identity(CCI).CCI is an independent prognostic marker associated with poor prognosis in ESCC.Further,we identify tropomyosin 4(TPM4)as a critical CCI gene that promotes the aggressiveness of ESCC in vitro and in vivo.And TPM4 creates CCI through activating the Jak/STAT-SOX2 pathway.Thus,our study suggests an unrecognized feature of ESCC cells,which might be of value for clinic prognosis and potential interference. | Xiangyu Pan Jian Wang Linjie Guo Feifei Na Jiajia Du Xuelan Chen Ailing Zhong Lei Zhao Lu Zhang Mengsha Zhang Xudong Wan Manli Wang Hongyu Liu Siqi Dai Ping Tan Jingyao Chen Yu Liu Bing Hu Chong Chen | 2022 | Signal Transduction and Targeted Therapy2022，7，5： | 0 |
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