Post-translational methylation at arginine residues is one of the most important covalent modifications of proteins, involved in a myriad of essential cellular processes in eukaryotes, such as transcriptional regulati...Post-translational methylation at arginine residues is one of the most important covalent modifications of proteins, involved in a myriad of essential cellular processes in eukaryotes, such as transcriptional regulation, RNA processing, signal transduction, and DNA repair. Methylation at arginine residues is catalyzed by a family of enzymes called protein arginine methyltransferases （PRMTs）. PRMTs have been extensively studied in various taxa and there is a growing tendency to unveil their functional importance in plants. Recent studies in plants revealed that this evolutionarily conserved family of enzymes regulates essential traits including vegetative growth, flowering time, circadian cycle, and response to high medium salinity and ABA. In this review, we highlight recent advances in the field of post- translational arginine methylation with special emphasis on the roles and future prospects of this modification in plants.展开更多
Cancer multidrug resistance(MDR)impairs the therapeutic efficacy of various chemotherapeutics.Novel approaches,particularly the development of MDR reversal agents,are critically needed to address this challenge.This s...Cancer multidrug resistance(MDR)impairs the therapeutic efficacy of various chemotherapeutics.Novel approaches,particularly the development of MDR reversal agents,are critically needed to address this challenge.This study demonstrates that tenacissoside I(TI),a compound isolated from Marsdenia tenacissima(Roxb.)Wight et Arn,traditionally used in clinical practice as an ethnic medicine for cancer treatment,exhibits significant MDR reversal effects in ABCB1-mediated MDR cancer cells.TI reversed the resistance of SW620/AD300 and KBV200 cells to doxorubicin(DOX)and paclitaxel(PAC)by downregulating ABCB1 expression and reducing ABCB1 drug transport function.Mechanistically,protein arginine methyltransferase 1(PRMT1),whose expression correlates with poor prognosis and shows positive association with both ABCB1 and EGFR expressions in tumor tissues,was differentially expressed in TI-treated SW620/AD300 cells.SW620/AD300 and KBV200 cells exhibited elevated levels of EGFR asymmetric dimethylarginine(aDMA)and enhanced PRMT1-EGFR interaction compared to their parental cells.Moreover,TI-induced PRMT1 downregulation impaired PRMT1-mediated aDMA of EGFR,PRMT1-EGFR interaction,and EGFR downstream signaling in SW620/AD300 and KBV200 cells.These effects were significantly reversed by PRMT1 overexpression.Additionally,TI demonstrated resistance reversal to PAC in xenograft models without detectable toxicities.This study establishes TI's MDR reversal effect in ABCB1-mediated MDR human cancer cells through inhibition of PRMT1-mediated aDMA of EGFR,suggesting TI's potential as an MDR modulator for improving chemotherapy outcomes.展开更多
2025年4月5日,上海交通大学医学院附属新华医院检验科郑英霞教授团队在权威期刊Journal for Immunotherapy of Cancer发表题目为“PRMT5 deficiency in myeloid cells reprograms macrophages to enhance antitumor immunity and synerg...2025年4月5日,上海交通大学医学院附属新华医院检验科郑英霞教授团队在权威期刊Journal for Immunotherapy of Cancer发表题目为“PRMT5 deficiency in myeloid cells reprograms macrophages to enhance antitumor immunity and synergizes with anti-PD-L1 therapy”的研究论文。该研究揭示了蛋白精氨酸甲基转移酶5(protein arginine methyltransferase 5,PRMT5)通过STAT6-PPARγ途径调节脂质代谢,促进单核巨噬细胞的迁移和分化,促进巨噬细胞向M2型极化。在小鼠髓系细胞中特异性敲除Prmt5(Prmt5 cKO)并进行肿瘤模型构建,发现在敲除鼠中肿瘤相关巨噬细胞发生重编程,抗肿瘤活性增强,抑制肿瘤进展并显著增强抗程序性死亡受体配体1(programmed death-ligand 1,PD-L1)的免疫治疗效果。该研究结果提示靶向髓系细胞中的PRMT5有望为癌症免疫治疗提供一种新的方法。展开更多
基金supported by National Basic Research Program of China(grant Nos.2011CB9154002009CB941500)+1 种基金National Natural Science Foundation of China(grant No.30621001)the Chinese Academy of Sciences(Grant No.KSCX2-YW-N-047) to X.Cao
文摘Post-translational methylation at arginine residues is one of the most important covalent modifications of proteins, involved in a myriad of essential cellular processes in eukaryotes, such as transcriptional regulation, RNA processing, signal transduction, and DNA repair. Methylation at arginine residues is catalyzed by a family of enzymes called protein arginine methyltransferases （PRMTs）. PRMTs have been extensively studied in various taxa and there is a growing tendency to unveil their functional importance in plants. Recent studies in plants revealed that this evolutionarily conserved family of enzymes regulates essential traits including vegetative growth, flowering time, circadian cycle, and response to high medium salinity and ABA. In this review, we highlight recent advances in the field of post- translational arginine methylation with special emphasis on the roles and future prospects of this modification in plants.
基金supported by the National Natural Science Foundation of China(Nos.82274211 and 82474190)the Natural Science Foundation of Tianjin(Nos.24JCZDJC00120 and 24PTLYHZ00280)Liaoning Provincial Department of Education Basic Research Projects for Higher Education Institutions(No.LJ212510163021)。
文摘Cancer multidrug resistance(MDR)impairs the therapeutic efficacy of various chemotherapeutics.Novel approaches,particularly the development of MDR reversal agents,are critically needed to address this challenge.This study demonstrates that tenacissoside I(TI),a compound isolated from Marsdenia tenacissima(Roxb.)Wight et Arn,traditionally used in clinical practice as an ethnic medicine for cancer treatment,exhibits significant MDR reversal effects in ABCB1-mediated MDR cancer cells.TI reversed the resistance of SW620/AD300 and KBV200 cells to doxorubicin(DOX)and paclitaxel(PAC)by downregulating ABCB1 expression and reducing ABCB1 drug transport function.Mechanistically,protein arginine methyltransferase 1(PRMT1),whose expression correlates with poor prognosis and shows positive association with both ABCB1 and EGFR expressions in tumor tissues,was differentially expressed in TI-treated SW620/AD300 cells.SW620/AD300 and KBV200 cells exhibited elevated levels of EGFR asymmetric dimethylarginine(aDMA)and enhanced PRMT1-EGFR interaction compared to their parental cells.Moreover,TI-induced PRMT1 downregulation impaired PRMT1-mediated aDMA of EGFR,PRMT1-EGFR interaction,and EGFR downstream signaling in SW620/AD300 and KBV200 cells.These effects were significantly reversed by PRMT1 overexpression.Additionally,TI demonstrated resistance reversal to PAC in xenograft models without detectable toxicities.This study establishes TI's MDR reversal effect in ABCB1-mediated MDR human cancer cells through inhibition of PRMT1-mediated aDMA of EGFR,suggesting TI's potential as an MDR modulator for improving chemotherapy outcomes.
文摘2025年4月5日,上海交通大学医学院附属新华医院检验科郑英霞教授团队在权威期刊Journal for Immunotherapy of Cancer发表题目为“PRMT5 deficiency in myeloid cells reprograms macrophages to enhance antitumor immunity and synergizes with anti-PD-L1 therapy”的研究论文。该研究揭示了蛋白精氨酸甲基转移酶5(protein arginine methyltransferase 5,PRMT5)通过STAT6-PPARγ途径调节脂质代谢,促进单核巨噬细胞的迁移和分化,促进巨噬细胞向M2型极化。在小鼠髓系细胞中特异性敲除Prmt5(Prmt5 cKO)并进行肿瘤模型构建,发现在敲除鼠中肿瘤相关巨噬细胞发生重编程,抗肿瘤活性增强,抑制肿瘤进展并显著增强抗程序性死亡受体配体1(programmed death-ligand 1,PD-L1)的免疫治疗效果。该研究结果提示靶向髓系细胞中的PRMT5有望为癌症免疫治疗提供一种新的方法。
