20-hydroxyecdysone(20E)induced transcription factor E93 is important for larval–adult transition,which functions in programmed cell death of larval obsolete tissues,and the formation of adult new tissues.However,the ...20-hydroxyecdysone(20E)induced transcription factor E93 is important for larval–adult transition,which functions in programmed cell death of larval obsolete tissues,and the formation of adult new tissues.However,the apoptosis-related genes directly regulated by E93 are still ambiguous.In this study,an E93 mutation fly strain was obtained by clustered regularly interspaced palindromic repeats(CRISPR)/CRISPR-associated protein 9-mediated long exon deletion to investigate whether and how E93 induces apoptosis during larval tissues metamorphosis.The transcriptional profile of E93 was consistent with 3 RHG(rpr,hid,and grim)genes and the effector caspase gene drice,and all their expressions peaked at the initiation of apoptosis during the degradation of salivary glands.The transcription expression of 3 RHG genes decreased and apoptosis was blocked in E93 mutation salivary gland during metamorphosis.In contrast,E93 overexpression promoted the transcription of 3 RHG genes,and induced advanced apoptosis in the salivary gland.Moreover,E93 not only enhance the promoter activities of the 3 RHG genes in Drosophila Kc cells in vitro,but also in the salivary gland in vivo.Our results demonstrated that 20E induced E93 promotes the transcription of RHG genes to trigger apoptosis during obsolete tissues degradation at metamorphosis in Drosophila.展开更多
目的:研究重组人粒细胞集落刺激因子(recombinant human granulocyte colony-stimulating factor,rhG-CSF)对大鼠局灶性脑缺血的神经元保护作用。方法:用线栓法建立大鼠大脑中动脉缺血再灌注模型,于再灌注不同时间点对治疗组和对照组进...目的:研究重组人粒细胞集落刺激因子(recombinant human granulocyte colony-stimulating factor,rhG-CSF)对大鼠局灶性脑缺血的神经元保护作用。方法:用线栓法建立大鼠大脑中动脉缺血再灌注模型,于再灌注不同时间点对治疗组和对照组进行神经缺损评分(NSS);并用免疫组织化学方法测定神经上皮干细胞蛋白(nestin)的表达。结果:与对照组相比,rhC-CSF治疗组大鼠的神经缺损评分明显降低(P<0.05);治疗组脑梗死区周围的nestin表达较对照组增多。结论:脑缺血再灌注后,一定剂量rhG-CSF可能通过提高nestin的表达,增加神经细胞的修复,改善脑卒中的预后。展开更多
基金the National Science Foundation of China(Grants No.32070491 to Kang Li)Laboratory of Lingnan Modern Agriculture Project(NT2021003 to Sheng Li)the National Science Foundation of Guangdong Province(Grants No.2022A1515010457 to Kang Li),English was polished by the Nature Publishing Group.
文摘20-hydroxyecdysone(20E)induced transcription factor E93 is important for larval–adult transition,which functions in programmed cell death of larval obsolete tissues,and the formation of adult new tissues.However,the apoptosis-related genes directly regulated by E93 are still ambiguous.In this study,an E93 mutation fly strain was obtained by clustered regularly interspaced palindromic repeats(CRISPR)/CRISPR-associated protein 9-mediated long exon deletion to investigate whether and how E93 induces apoptosis during larval tissues metamorphosis.The transcriptional profile of E93 was consistent with 3 RHG(rpr,hid,and grim)genes and the effector caspase gene drice,and all their expressions peaked at the initiation of apoptosis during the degradation of salivary glands.The transcription expression of 3 RHG genes decreased and apoptosis was blocked in E93 mutation salivary gland during metamorphosis.In contrast,E93 overexpression promoted the transcription of 3 RHG genes,and induced advanced apoptosis in the salivary gland.Moreover,E93 not only enhance the promoter activities of the 3 RHG genes in Drosophila Kc cells in vitro,but also in the salivary gland in vivo.Our results demonstrated that 20E induced E93 promotes the transcription of RHG genes to trigger apoptosis during obsolete tissues degradation at metamorphosis in Drosophila.
文摘目的:研究重组人粒细胞集落刺激因子(recombinant human granulocyte colony-stimulating factor,rhG-CSF)对大鼠局灶性脑缺血的神经元保护作用。方法:用线栓法建立大鼠大脑中动脉缺血再灌注模型,于再灌注不同时间点对治疗组和对照组进行神经缺损评分(NSS);并用免疫组织化学方法测定神经上皮干细胞蛋白(nestin)的表达。结果:与对照组相比,rhC-CSF治疗组大鼠的神经缺损评分明显降低(P<0.05);治疗组脑梗死区周围的nestin表达较对照组增多。结论:脑缺血再灌注后,一定剂量rhG-CSF可能通过提高nestin的表达,增加神经细胞的修复,改善脑卒中的预后。
