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[1]刘旭婧,韩雪,李铭宸,等.MN1单域抗体的筛选及功能探究[J].天津医科大学学报,2025,31(05):421-429.[doi:10.20135/j.issn.1006-8147.2025.05.0421]
 LIU Xujing,HAN Xue,LI Mingchen,et al.Screening and functional characterization of single-domain antibodies targeting MN1[J].Journal of Tianjin Medical University,2025,31(05):421-429.[doi:10.20135/j.issn.1006-8147.2025.05.0421]
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MN1单域抗体的筛选及功能探究(PDF)
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《天津医科大学学报》[ISSN:1006-8147/CN:12-1259/R]

卷:
31卷
期数:
2025年05期
页码:
421-429
栏目:
基础医学
出版日期:
2025-09-20

文章信息/Info

Title:
Screening and functional characterization of single-domain antibodies targeting MN1
文章编号:
1006-8147(2025)05-0421-09
作者:
刘旭婧1韩雪1李铭宸1马振毅2刘喆2
1.天津医科大学基础医学院免疫学系,天津300070;2.杭州师范大学基础医学院生物化学与分子生物学系,杭州311121
Author(s):
LIU Xujing1 HAN Xue1 LI Mingchen1 MA Zhenyi2 LIU Zhe2
1.Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, China; 2.Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Hangzhou Normal University, Hangzhou 311121, China
关键词:
isPLA-seq单域抗体MN1转录组测序转录调控
Keywords:
isPLA-seq sdAbs MN1 RNA-seq transcriptional regulation
分类号:
R361+.3
DOI:
10.20135/j.issn.1006-8147.2025.05.0421
文献标志码:
A
摘要:
目的:筛选并验证内在无序蛋白Meningioma-1(MN1)单域抗体(sdAbs)及其生物学功能。方法:利用原位邻近连接分析联合二代测序技术(isPLA-seq)筛选合成sdAb库,并借助截短突变体结合实验和免疫共沉淀(Co-IP)验证抗体特异性;通过假单胞菌外毒素A(ETA)跨膜肽递送系统导入重组sdAb;采用转录组测序(RNA-seq)、基因集富集分析(GSE)及双荧光素酶报告实验解析其分子机制。结果:成功筛选出靶向MN1的sdAbs,其中特异性结合MN1的N端polyQ无序区域的sdAb #11,通过ETA递送入胞内可显著抑制MN1功能。与正常细胞相比,sdAb #11诱导U2OS细胞周期停滞,G0/G1期比例升高(F=565.30, P<0.001, sdAb #11/NC: t=13.25, P<0.001),细胞的集落形成能力降低;RNA-seq显示该sdAb通过干扰BAF(mSWI/SNF)复合物的染色质重塑活性,进而下调致癌基因表达,同时降低MN1 mRNA水平。结论:MN1 sdAb具有抑制MN1功能,阻滞细胞周期,下调致癌基因的潜能。
Abstract:
Objective: To screen and functionally characterize single-domain antibodies(sdAbs) targeting the intrinsically disordered protein Meningioma-1(MN1) and their biological functions. Methods: A synthetic sdAb library was screened using in situ proximity ligation assay sequencing(isPLA-seq). Antibody specificity was validated through truncated mutant binding assays and co-immu-noprecipitation(Co-IP). Recombinant sdAbs were delivered into cells via a Pseudomonas exotoxin A (ETA) transmembrane peptide system. Molecular mechanisms were investigated using transcriptome sequencing (RNA-seq), gene set enrichment analysis (GSE), and dual-luciferase reporter assays. Results: The sdAbs targeting MN1 were successfully screened. Among them, the sdAb#11, which specifically bound to the N-terminal polyQ disordered region of MN1, could significantly inhibit the function of MN1 when delivered into the cells by ETA. Compared with normal cells, sdAb#11 induced U2OS cell cycle arrest, increased the ratio of G0/G1 phase(F=565.30, P<0.001, sdAb #11/NC: t=13.25, P<0.001), and reduced colony forming ability of cells. RNA-seq analysis revealed that sdAb downregulated oncogene expression and concomitantly reduced MN1 mRNA levels by interfering chromatin remodeling activity of the BAF(mSWI/SNF) complex. Conclusion: MN1 sdAb has the potential to inhibit the function of MN1, block the cell cycle and down-regulate oncogenes.

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备注/Memo

备注/Memo:
基金项目:国家自然科学基金(82173320)
作者简介:刘旭婧(1999-),女,硕士在读,研究方向:免疫学;通信作者:刘喆,E-mail:zheliu@tmu.edu.cn。
更新日期/Last Update: 2025-10-01